1
00:00:00,000 --> 00:00:04,875

2
00:00:04,875 --> 00:00:05,750
ANDI PENG: zote haki.

3
00:00:05,750 --> 00:00:08,240
Karibu wiki nne za sehemu.

4
00:00:08,240 --> 00:00:10,280
Ni siku nzuri
nje hapa katika New Haven

5
00:00:10,280 --> 00:00:14,370
hivyo kweli mimi nadhani sparse
kutawanyika kwa watoto kwamba

6
00:00:14,370 --> 00:00:17,530
alijiunga nami kwa sehemu leo, asante.

7
00:00:17,530 --> 00:00:21,517
>> Kwa hiyo kwa haraka, kabla tu
kuanza, ajenda ya leo.

8
00:00:21,517 --> 00:00:23,600
Sisi ni kwenda juu
chache fupi matangazo.

9
00:00:23,600 --> 00:00:26,224
Tuna ratiba kweli wacky
kuja juu katika wiki mbili zijazo

10
00:00:26,224 --> 00:00:28,010
au hivyo hivyo tunakwenda kwenda juu kwamba.

11
00:00:28,010 --> 00:00:30,410
Pili, najua
kila mtu favorite topic--

12
00:00:30,410 --> 00:00:33,572
Nina hakika hii melted akili yako
wakati wa hotuba, msiwe na wasiwasi,

13
00:00:33,572 --> 00:00:34,780
Mimi bado aina ya si kupata.

14
00:00:34,780 --> 00:00:35,444
Ni faini.

15
00:00:35,444 --> 00:00:36,110
Hiyo ilikuwa ni mzaha.

16
00:00:36,110 --> 00:00:37,450
Mimi kwa kweli kufanya kupata hiyo.

17
00:00:37,450 --> 00:00:40,234
Lakini mimi kuhakikisha kwamba
nyie kupata, pia.

18
00:00:40,234 --> 00:00:42,400
Hivyo sisi ni kwenda kutumia
kweli, kiasi mzuri

19
00:00:42,400 --> 00:00:44,020
muda kuzungumza juu ya pointer leo.

20
00:00:44,020 --> 00:00:47,012
Kama unaweza kuona, pipi ya
Majadiliano ni kubwa leo.

21
00:00:47,012 --> 00:00:49,220
Sisi ni kweli kwenda kuweka
that-- yeah, hiyo ni haki.

22
00:00:49,220 --> 00:00:49,890
Kuweka pipi kuchukua.

23
00:00:49,890 --> 00:00:51,556
Mimi nina kwenda kupita wao kuzunguka hivi sasa.

24
00:00:51,556 --> 00:00:55,150

25
00:00:55,150 --> 00:00:56,510
Hakuna wasiwasi.

26
00:00:56,510 --> 00:00:59,570
Tunakwenda kweli kujaribu
kuweka damu ya watu sukari

27
00:00:59,570 --> 00:01:04,390
up kwa sababu kwamba ubongo ni kwenda kuchoma
baadhi leo oksijeni kwa sababu kuyatumia

28
00:01:04,390 --> 00:01:05,652
ni kweli, ngumu kweli kweli.

29
00:01:05,652 --> 00:01:08,360
Kisha sisi ni kwenda kuzungumza kuhusu
kumbukumbu ya usimamizi ambayo ni aina ya

30
00:01:08,360 --> 00:01:09,487
katika ulimwengu wa sawa.

31
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Na tunakwenda hoja
kwenye redirection na faili

32
00:01:11,570 --> 00:01:15,297
I / O ambayo ni syntax tu, nzuri
mambo ambayo tunapaswa kuzungumzia.

33
00:01:15,297 --> 00:01:17,130
Na kisha mwisho, mimi nina
kwenda kwa mara nyingine tena kujaribu

34
00:01:17,130 --> 00:01:19,070
kuondoka kama 10, 15 dakika kwa pset4.

35
00:01:19,070 --> 00:01:21,820
Hiyo ni kutokana katika siku chache hivyo sisi ni
kwenda kwa kweli aina ya kukupa

36
00:01:21,820 --> 00:01:24,850
baadhi mwanga msaada kama wewe
tayari got kuanza juu ya jambo hilo.

37
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Baridi.

38
00:01:26,141 --> 00:01:26,640
SAWA.

39
00:01:26,640 --> 00:01:30,710
Hivyo baadhi matangazo
kwa wiki hii ya ujao.

40
00:01:30,710 --> 00:01:31,805
Grading.

41
00:01:31,805 --> 00:01:33,930
Mimi si kweli kujua katika
hatua hii ni wangapi kati yenu

42
00:01:33,930 --> 00:01:37,180
guys ni kweli katika yangu
section-- wewe OK huko?

43
00:01:37,180 --> 00:01:38,020
SAWA.

44
00:01:38,020 --> 00:01:40,150
Lakini, kwa wale
walio katika sehemu yangu,

45
00:01:40,150 --> 00:01:42,180
michache tu maoni juu ya grading.

46
00:01:42,180 --> 00:01:44,899
>> Kwanza, kazi nzuri kwa kweli ya kutoa maoni.

47
00:01:44,899 --> 00:01:47,940
Wale ambao hawana kutoa maoni, wewe
kujua wewe ni nani kwa sababu wewe pengine

48
00:01:47,940 --> 00:01:50,610
got baadhi pointi style dinged wiki hii.

49
00:01:50,610 --> 00:01:53,920
Tu kuhakikisha kwamba katika wote wa yako
Mipango kuongeza maoni wanandoa.

50
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Kwa kweli, mtindo ni kweli rahisi
kupata pointi sahihi kama wigo.

51
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Hivyo kwa ajili yetu, tu kufanya
kuhakikisha kwamba wewe ni aina

52
00:01:58,710 --> 00:02:03,770
ya kuongeza maelezo mafupi katika yote
mipango yako juu ya nini unafanya.

53
00:02:03,770 --> 00:02:09,190
>> Secondly-- hili ni suala kubwa kwa
mengi ya TAS week-- hii iliyopita

54
00:02:09,190 --> 00:02:12,020
hivyo kuhakikisha wewe ni kuweka kwa
folder sahihi na kwa usahihi

55
00:02:12,020 --> 00:02:13,370
aitwaye mipango.

56
00:02:13,370 --> 00:02:16,820
Na sababu ni kwa nini tunaomba huu ni
kwa sababu sisi, katika mwendo wa grading,

57
00:02:16,820 --> 00:02:20,820
kweli kuendesha script juu yako
kificho kwamba downloads moja kwa moja

58
00:02:20,820 --> 00:02:24,780
wote wa psets yako, anaendesha
vipimo usahihi juu ya wote,

59
00:02:24,780 --> 00:02:27,550
na kisha uploads alama yako
moja kwa moja kwenye gradebook.

60
00:02:27,550 --> 00:02:32,140
Hata hivyo, katika hatua yoyote, kama wewe
aitwaye mpango wako kimakosa,

61
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ni screws up nzima
mpango kwa ajili ya kila mtu.

62
00:02:34,510 --> 00:02:37,280
>> Na hivyo, kihalali,
Muswada hii nzuri

63
00:02:37,280 --> 00:02:40,260
kwamba tumekuwa imeandikwa kwamba hana
yote haya kwa ajili yetu, kabisa

64
00:02:40,260 --> 00:02:43,070
shambulio kama huna
mpango wako aitwaye usahihi.

65
00:02:43,070 --> 00:02:46,020
Hivyo tu kupakia na sahihi
folder, na wao aitwaye usahihi,

66
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na kisha maisha ni nzuri.

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00:02:47,372 --> 00:02:49,080
Mimi kupata psets yako nyuma
kwa nyie mapema

68
00:02:49,080 --> 00:02:51,110
kwa sababu mimi kupata daraja yao haraka.

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Naam.

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00:02:52,461 --> 00:02:52,960
SAWA.

71
00:02:52,960 --> 00:02:57,870
Na pia sisi ni kwenda kuzungumza
about-- Yale ina kweli, kweli

72
00:02:57,870 --> 00:02:59,950
wacky ratiba katika wiki hizi mbili.

73
00:02:59,950 --> 00:03:02,460
Hivyo wale wa wewe guys katika
Harvard, hii haina kuomba.

74
00:03:02,460 --> 00:03:05,585
Lakini kwetu sisi watoto nzuri katika Yale tuna
kitu kinachoitwa kuanguka break-- pole,

75
00:03:05,585 --> 00:03:08,430
Harvard-- ambapo tuna
siku tano mbali la shule.

76
00:03:08,430 --> 00:03:12,270
Na wakati huu ni nzuri, ni
aina ya messes up pset yetu dansi

77
00:03:12,270 --> 00:03:14,104
kwa sababu psets ni kutokana Alhamisi, Ijumaa.

78
00:03:14,104 --> 00:03:16,020
Na hivyo kama sisi siyo hapa
Alhamisi, Ijumaa, sisi

79
00:03:16,020 --> 00:03:18,640
Huwezi kuwa na kazi kwa nyie
kutokana Alhamisi, Ijumaa.

80
00:03:18,640 --> 00:03:23,832
>> Hivyo nini tunakwenda kufanya is-- tuko
kama 99% uhakika kama hii ni nini kinatokea,

81
00:03:23,832 --> 00:03:25,540
kuna inaweza kuwa baadhi
mabadiliko lakini nadhani ni

82
00:03:25,540 --> 00:03:28,460
subtle-- ni tunakwenda
have-- wiki hii ni kawaida.

83
00:03:28,460 --> 00:03:32,130
Hivyo tuna sehemu yetu juu ya
Jumanne ikifuatiwa na masaa ya ofisi

84
00:03:32,130 --> 00:03:35,190
katika mapumziko ya wiki
na kisha pset4 ni kutokana siku ya Ijumaa.

85
00:03:35,190 --> 00:03:38,180
Basi, kama nyie wote tunajua, kama
Mimi aliwakumbusha nyie wiki iliyopita,

86
00:03:38,180 --> 00:03:41,700
tuna jaribio yetu 0
kuja juu ya Jumatano.

87
00:03:41,700 --> 00:03:44,400
>> Na hivyo, kuwa mwanafunzi mwenyewe,
Mimi najua kuwa sana wachache wenu

88
00:03:44,400 --> 00:03:49,110
guys kweli kuwa kazi ya
pset5 siku mbili kabla ya jaribio lako.

89
00:03:49,110 --> 00:03:51,110
Kwa hiyo kile tunakwenda
pengine kuishia kufanya ni,

90
00:03:51,110 --> 00:03:54,840
kwamba Jumatatu usiku, tunakwenda
kwa kweli, 5:30-7:00,

91
00:03:54,840 --> 00:03:59,970
na mapitio mafupi
kikao juu ya mada mifuniko.

92
00:03:59,970 --> 00:04:02,040
Haieleweki kama ni
kupitia kikao au Maswali na Majibu.

93
00:04:02,040 --> 00:04:04,650
Itakuwa aina fulani ya mapitio
namna ambayo tutaweza cover

94
00:04:04,650 --> 00:04:06,640
baadhi ya mada husika kwa nyie.

95
00:04:06,640 --> 00:04:09,886
>> Na kisha Jumatatu na Jumanne usiku
mwa wiki kwamba 8:00-11:00,

96
00:04:09,886 --> 00:04:11,260
tunakwenda kuwa na masaa ya ofisi.

97
00:04:11,260 --> 00:04:14,500
Masaa wale ofisi mapenzi zaidi
uwezekano kuwa zaidi ya kuja tu katika,

98
00:04:14,500 --> 00:04:17,564
kuuliza maswali yako kuhusu TAS
dhana yoyote wewe ni kuchanganyikiwa kuhusu,

99
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na wao itabidi aina ya kwenda juu na wewe
na mapitio ya dhana kwa jaribio.

100
00:04:20,480 --> 00:04:22,920
Jaribio 0, kama wewe ni katika
Jumatatu, Jumatano sehemu,

101
00:04:22,920 --> 00:04:26,480
itakuwa Jumatano wakati wa
class-- Jumatano wakati wa darasa.

102
00:04:26,480 --> 00:04:29,530
Na kisha kama wewe ni katika
Jumanne, Alhamisi sehemu,

103
00:04:29,530 --> 00:04:32,577
itakuwa pia wakati wa darasa Alhamisi.

104
00:04:32,577 --> 00:04:34,410
Huwezi kweli kuchagua
ambayo moja ya kwenda.

105
00:04:34,410 --> 00:04:35,640
Kama uko Jumatatu, Jumatano,
una kwenda kwa Jumatano.

106
00:04:35,640 --> 00:04:38,056
Kama wewe ni juu Jumanne, Alhamisi
una kwenda kwa Alhamisi.

107
00:04:38,056 --> 00:04:42,277
Lakini basi usiku huo,
sisi wafanyakazi nzuri, itakuwa

108
00:04:42,277 --> 00:04:45,360
na jaribio kubwa grading chama katika
ambayo tutaweza kupata alama yako nyuma yenu

109
00:04:45,360 --> 00:04:46,190
kwamba usiku.

110
00:04:46,190 --> 00:04:46,900
Kwa nini wakati?

111
00:04:46,900 --> 00:04:51,190
Wazi, ambaye anajua, lakini itakuwa
kuwa nyuma yenu ndani ya masaa 24

112
00:04:51,190 --> 00:04:53,700
ili nyie hopefully
kuwa na baadhi ya maoni na Ijumaa.

113
00:04:53,700 --> 00:04:55,870
>> Na kisha tuna wiki kweli Wacky.

114
00:04:55,870 --> 00:05:00,330
Hivyo pset5 ni moja ya
psets gumu ya mwaka.

115
00:05:00,330 --> 00:05:03,370
Hivyo pole guys.

116
00:05:03,370 --> 00:05:06,520
Nini sisi ni kwenda kujaribu
kufanya ni tunakwenda na

117
00:05:06,520 --> 00:05:08,380
baadhi ya msaada halisi mwishoni mwa wiki hiyo.

118
00:05:08,380 --> 00:05:12,970
Kwa sababu, kama wewe guys unaweza kuona,
pset ni kutokana kabla ya kuanguka mapumziko.

119
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Hatuna msaada kwa ajili ya
nyie wakati wa kuanguka mapumziko

120
00:05:16,760 --> 00:05:18,897
na hivyo sisi kweli aina ya
wanataka msemo huu kama,

121
00:05:18,897 --> 00:05:21,230
hebu kupata hii juu na,
hebu kazi kweli, kweli ngumu

122
00:05:21,230 --> 00:05:25,380
wiki hizi mbili, kupata Jaribio hii
na kuongeza psets hizi mbili kufanywa na

123
00:05:25,380 --> 00:05:29,650
na kisha nyie kuwa nzuri kufurahi
muda wa siku saba bila kufikiri kuhusu CS.

124
00:05:29,650 --> 00:05:33,750
>> Hivyo ili kwa kuwa kwa
kutokea, sisi ni pengine

125
00:05:33,750 --> 00:05:36,870
kwenda hoja ya kifungu yangu
kwa Jumapili mchana.

126
00:05:36,870 --> 00:05:39,070
Itakuwa zingine hivyo hakuna
wasiwasi kama huwezi kuja.

127
00:05:39,070 --> 00:05:41,595
Lakini sinema online mapenzi
kuwa huko na kupatikana

128
00:05:41,595 --> 00:05:47,630
ili nyie na Jumapili,
Jumatatu, Jumanne, kufanya kazi ya pset5.

129
00:05:47,630 --> 00:05:50,205
Na kisha ni kuanguka
kuvunja na hakuna CS na kisha

130
00:05:50,205 --> 00:05:51,830
sisi kurudi na kurudi kwake mwaka saga.

131
00:05:51,830 --> 00:05:54,926
>> Lakini itakuja kuwa
wiki nzuri kwa ajili ya mapumziko kuanguka

132
00:05:54,926 --> 00:05:58,050
na sisi kweli wanataka kufanya hivyo kama mkazo
bure kwa kila mtu iwezekanavyo ambayo

133
00:05:58,050 --> 00:06:02,620
Hii ndiyo sababu sisi wakiongozwa pset kuwa kutokana
kabla ya kuanguka mapumziko badala ya baada.

134
00:06:02,620 --> 00:06:07,601
Kwa sababu it's-- I mean, mimi aina ya kujisikia
kama ni kushindwa madhumuni ya kuwa na

135
00:06:07,601 --> 00:06:10,850
tarehe ya mwisho baada ya kuanguka mapumziko kama kuna
hakuna msaada anyways wakati wa kuanguka mapumziko.

136
00:06:10,850 --> 00:06:14,670
Hivyo ni rather-- Nadhani
tunatarajia kuelekeza nguvu zaidi katika hali hiyo sasa.

137
00:06:14,670 --> 00:06:16,950
Je, mtu yeyote una maswali
kuhusu ratiba hiyo?

138
00:06:16,950 --> 00:06:17,830
Chochote utata?

139
00:06:17,830 --> 00:06:18,330
Naam.

140
00:06:18,330 --> 00:06:20,944
>> Watazamaji: Je bado tuna
hotuba ya 21?

141
00:06:20,944 --> 00:06:21,610
ANDI PENG: Naam.

142
00:06:21,610 --> 00:06:26,421
Hivyo tarehe 21, pale ni kwenda kuwa
hotuba kwamba ni moja kwa moja kutoka Harvard.

143
00:06:26,421 --> 00:06:29,170
Sijui kama Daudi ni sinema
au kama yeye kweli mhadhiri,

144
00:06:29,170 --> 00:06:32,430
lakini ni kwenda kuwa inapatikana
online kwa nyie kupata.

145
00:06:32,430 --> 00:06:35,510
Hivyo tu kuhakikisha kuchonga
saa nje mahali fulani katika kuanguka mapumziko

146
00:06:35,510 --> 00:06:39,375
hivyo nyie wanaweza kupata
juu ya kwamba hotuba.

147
00:06:39,375 --> 00:06:39,875
Yeah?

148
00:06:39,875 --> 00:06:40,300
>> Watazamaji: Naam.

149
00:06:40,300 --> 00:06:40,422
Pole.

150
00:06:40,422 --> 00:06:41,280
I got hapa couple--

151
00:06:41,280 --> 00:06:41,640
>> ANDI PENG: Hakuna wasiwasi.

152
00:06:41,640 --> 00:06:42,556
Hapa, kuchukua baadhi ya pipi.

153
00:06:42,556 --> 00:06:45,350

154
00:06:45,350 --> 00:06:47,800
>> Watazamaji: Hey, mimi hawakupata hiyo.

155
00:06:47,800 --> 00:06:53,869
Hivyo tu kwa kurejea, si kesho lakini
Jumatano baada ya hapo, tuna jaribio.

156
00:06:53,869 --> 00:06:54,660
ANDI PENG: Sahihi.

157
00:06:54,660 --> 00:06:59,207
Watazamaji: Na itakuja be--
nini muundo wa jaribio?

158
00:06:59,207 --> 00:06:59,790
ANDI PENG: Oh.

159
00:06:59,790 --> 00:07:03,870
Hivyo tutaweza kutuma nje email kwamba
inashughulikia kwamba zaidi ya yote kwa kina.

160
00:07:03,870 --> 00:07:06,590
Lakini, kimsingi, ni tu inashughulikia
mada za msingi tayari kufunikwa

161
00:07:06,590 --> 00:07:09,042
katika nusu ya kwanza ya muhula.

162
00:07:09,042 --> 00:07:12,250
Kutakuwa na vikao mapitio na swali
na majibu hivyo hakuna wasiwasi juu ya hilo.

163
00:07:12,250 --> 00:07:14,107
Lakini tutaweza kuwa kwenda juu ya kwamba pia.

164
00:07:14,107 --> 00:07:16,940
Watazamaji: Je, ni kwenda kuwa, sisi
kuleta kompyuta yetu na kanuni there--

165
00:07:16,940 --> 00:07:17,140
ANDI PENG: Hapana

166
00:07:17,140 --> 00:07:20,130
Ni kwenda kuwa nyie kuandika
na kujibu maswali kwa mkono.

167
00:07:20,130 --> 00:07:21,160
>> Watazamaji: Oh.

168
00:07:21,160 --> 00:07:23,160
>> ANDI PENG: Hivyo tutaweza kutoa
mazoea nje na mambo

169
00:07:23,160 --> 00:07:26,420
hivyo nyie kutaka labda kwenda
nyuma na kuandika upya Mario kwa mkono tu

170
00:07:26,420 --> 00:07:28,100
kuhakikisha wewe guys kuwa
wazo la jinsi ya kufanya hivyo.

171
00:07:28,100 --> 00:07:29,933
Kwa sababu wakati mwingine wakati
kuandika kwa mkono wewe

172
00:07:29,933 --> 00:07:32,656
kusahau semicolons na mambo
na kwamba ni mbaya.

173
00:07:32,656 --> 00:07:34,156
Watazamaji: Je, si kwamba kuwa [inaudible]?

174
00:07:34,156 --> 00:07:38,290
Kama, wewe ni kupata
semicolon juu ya your--

175
00:07:38,290 --> 00:07:40,270
>> ANDI PENG: Ndiyo na hapana.

176
00:07:40,270 --> 00:07:43,170
Tutaweza majadiliano zaidi katika kina
kuhusu jinsi mpangilio jaribio ni

177
00:07:43,170 --> 00:07:44,550
na jinsi tunakwenda daraja.

178
00:07:44,550 --> 00:07:47,425
Lakini kimsingi, tu kujua kwamba
ujumla format ni kwenda kuwa wewe

179
00:07:47,425 --> 00:07:49,930
guys ama kutafsiri code--
kujibu maswali ya msingi.

180
00:07:49,930 --> 00:07:51,370
Kama mimi aliuliza wewe, ni nini maktaba?

181
00:07:51,370 --> 00:07:53,450
Nyie lazima kujua nini a
maktaba gani na kuandika kwamba chini.

182
00:07:53,450 --> 00:07:56,283
Au mimi anaweza kusema, kuandika mpango huo
Prints Hello World kwa screen.

183
00:07:56,283 --> 00:08:01,140
Nyie bila kuandika, int kuu
utupu printf hujambo dunia semicolon.

184
00:08:01,140 --> 00:08:01,908
Naam.

185
00:08:01,908 --> 00:08:04,398
>> Watazamaji: Hivyo si kwenda
kwa kuwa mahali popote [inaudible]

186
00:08:04,398 --> 00:08:05,900
kiwango cha ugumu wa tatizo kuweka?

187
00:08:05,900 --> 00:08:06,170
>> ANDI PENG: Hapana

188
00:08:06,170 --> 00:08:06,380
Hakuna

189
00:08:06,380 --> 00:08:07,046
Sisi won't-- yeah.

190
00:08:07,046 --> 00:08:10,030
Kuandika ukamilifu wa
mchezo wa 15 katika dakika 20, kwenda.

191
00:08:10,030 --> 00:08:12,120
Hapana, huwezi kuwa na kwamba.

192
00:08:12,120 --> 00:08:12,801
Hakuna

193
00:08:12,801 --> 00:08:13,342
Watazamaji: Sawa.

194
00:08:13,342 --> 00:08:15,326
Hivyo kwamba ni Jumatano.

195
00:08:15,326 --> 00:08:19,017
Wakati kwamba wiki sisi pia
kuwa tatizo gumu kuweka?

196
00:08:19,017 --> 00:08:19,600
ANDI PENG: Hapana

197
00:08:19,600 --> 00:08:22,970
Hivyo tatizo hilo kutokana kuweka
siku moja kabla ya kuanguka mapumziko.

198
00:08:22,970 --> 00:08:25,690
Schedule-- barua pepe
kwa kweli kutuma nje

199
00:08:25,690 --> 00:08:27,232
Dakika 20 iliyopita kuhusu yote haya.

200
00:08:27,232 --> 00:08:28,689
Hivyo nyie tu kuangalia barua pepe yako.

201
00:08:28,689 --> 00:08:29,430
Ni utakuwa huko.

202
00:08:29,430 --> 00:08:30,060
Naam.

203
00:08:30,060 --> 00:08:31,701
Hakuna wasiwasi.

204
00:08:31,701 --> 00:08:32,200
Baridi.

205
00:08:32,200 --> 00:08:34,900

206
00:08:34,900 --> 00:08:38,900
>> Maswali yoyote ujumla kuhusu
matangazo, grading, Quizzes,

207
00:08:38,900 --> 00:08:41,659
kabla ya sisi kupiga mbizi haki ndani
kuyatumia ambayo itakuwa hutumia

208
00:08:41,659 --> 00:08:45,060
Wengi wa sehemu yetu wakati leo?

209
00:08:45,060 --> 00:08:47,030
Baridi.

210
00:08:47,030 --> 00:08:47,530
Sawa.

211
00:08:47,530 --> 00:08:50,905
Hivyo, nyie wote kuangalia lovely-- hii
Sijui nini simu yake.

212
00:08:50,905 --> 00:08:53,490
Jambo ambapo claymation
akapiga yenyewe up kwa sababu

213
00:08:53,490 --> 00:08:54,820
hakutumia pointer kwa usahihi.

214
00:08:54,820 --> 00:08:57,629
Naam, mpango wako ni kwenda
pengine pigo yenyewe up kama wewe

215
00:08:57,629 --> 00:08:59,170
hawatumii kuyatumia kwa usahihi vile vile.

216
00:08:59,170 --> 00:09:01,250
Hivyo sisi ni kwenda kufanya
kuhakikisha kwamba haina kutokea.

217
00:09:01,250 --> 00:09:04,810
>> Leo tunakwenda
kufanya baadhi ya furaha pointer.

218
00:09:04,810 --> 00:09:08,970
Mimi nina kwenda juu ya mambo
kama vizuri kama Nadhani

219
00:09:08,970 --> 00:09:10,790
Inawezekana katika sura ndogo wakati.

220
00:09:10,790 --> 00:09:14,592
Lakini kuna kiasi tu ili kufidia
kwamba kwa kweli mimi nataka nyie,

221
00:09:14,592 --> 00:09:17,300
kama huna kuelewa kitu,
na siyo tu napenda kuendelea.

222
00:09:17,300 --> 00:09:18,580
Kwa sababu kama huna
kuelewa kitu,

223
00:09:18,580 --> 00:09:21,329
pengine wewe si kwenda
kuelewa chochote nasema baada ya hapo.

224
00:09:21,329 --> 00:09:23,310
Hivyo tafadhali kuacha yangu na kuuliza swali.

225
00:09:23,310 --> 00:09:25,380
Kwa sababu kila aina
ya snowballs pamoja.

226
00:09:25,380 --> 00:09:27,800
Kama, kuyatumia kuongoza katika
kumbukumbu kuongoza katika mambo mengine.

227
00:09:27,800 --> 00:09:31,710
Na hivyo kama huna kuelewa kuyatumia,
kunizuia na tutaweza ukafikirie

228
00:09:31,710 --> 00:09:35,070
na maisha itakuwa vizuri.

229
00:09:35,070 --> 00:09:35,680
>> Baridi.

230
00:09:35,680 --> 00:09:39,050
Hivyo ni jinsi wengi wenu guys katika hotuba,
Daudi zilizotajwa kuyatumia,

231
00:09:39,050 --> 00:09:42,050
akili yako aina ya yamegeuka Jell-O?

232
00:09:42,050 --> 00:09:42,550
Naam.

233
00:09:42,550 --> 00:09:44,190
Nzuri.

234
00:09:44,190 --> 00:09:46,900
Sisi ni kwenda kujaribu kwa
de-Jell-O akili yako leo.

235
00:09:46,900 --> 00:09:50,300
Tunakwenda kweli utaratibu
kwenda kwa njia ya nini hasa pointer ni,

236
00:09:50,300 --> 00:09:52,530
kile yake, na jinsi sisi matumizi yao.

237
00:09:52,530 --> 00:09:56,620
>> Basi wote pointers-- hivyo
kawaida na vigezo

238
00:09:56,620 --> 00:10:00,920
tumekuwa kutumia katika coding, kama
vigezo kama vile integers au masharti

239
00:10:00,920 --> 00:10:04,790
au ikifungwa, wao ni wote kimsingi
thamani kwa ajili yao

240
00:10:04,790 --> 00:10:06,870
kama vile anuani
akizungumzia thamani hiyo.

241
00:10:06,870 --> 00:10:08,895
Hivyo nina kwenda kuteka haki hii sasa.

242
00:10:08,895 --> 00:10:14,270

243
00:10:14,270 --> 00:10:16,140
Tuna karibu hakuna chaki lakini hiyo ni sawa.

244
00:10:16,140 --> 00:10:25,550
>> Hivyo kwa mfano, kwa kawaida
njia ambayo tumekuwa

245
00:10:25,550 --> 00:10:30,860
wamekuwa wakitumia vigezo ni sisi kujenga
jina la kutofautiana wa aina int, hebu

246
00:10:30,860 --> 00:10:31,360
kusema tu.

247
00:10:31,360 --> 00:10:37,360
Hivyo hapa sisi tumepewa int x na tuko
initializing kwamba int 50.

248
00:10:37,360 --> 00:10:42,390
Hivyo hapa katika hii block ya kumbukumbu juu ya yetu
kompyuta tumekuwa kuhifadhiwa idadi ya 50.

249
00:10:42,390 --> 00:10:46,170
Hivyo ambapo kuyatumia kuja kucheza ni
kwamba kompyuta yako itself-- kama, hapa,

250
00:10:46,170 --> 00:10:48,880
kimwili katika gari ngumu
katika RAM ya computer-- yangu

251
00:10:48,880 --> 00:10:51,147
ni tu ina kiasi kidogo cha kumbukumbu.

252
00:10:51,147 --> 00:10:53,980
Huwezi tu kuendelea kuhifadhi vitu
juu ya mambo juu ya mambo

253
00:10:53,980 --> 00:10:54,990
na kuwa nao wote.

254
00:10:54,990 --> 00:10:59,570
>> Hivyo njia kwamba sisi allot dynamically
kumbukumbu ya kuwa na uwezo wa kuhifadhi nini tunataka

255
00:10:59,570 --> 00:11:03,150
na upatikanaji hilo, ni kwa kuwa na kuyatumia.

256
00:11:03,150 --> 00:11:06,210
Hivyo kufikiria katika kumbukumbu nafasi yako, sawa.

257
00:11:06,210 --> 00:11:10,420
Kama hii ni RAM ya yako
kompyuta, una bits hizi kidogo

258
00:11:10,420 --> 00:11:14,540
au vitalu au ka ya kumbukumbu katika
which-- hizi ni kidogo tu

259
00:11:14,540 --> 00:11:18,120
vitalu kwamba zimetengwa nje ya
gari ngumu au RAM ya kompyuta yako,

260
00:11:18,120 --> 00:11:21,950
na ndani ya kila mmoja vitalu wale
unaweza kuhifadhi mambo mbalimbali.

261
00:11:21,950 --> 00:11:26,990
Hivyo kwa mfano, moja
safu katika mfano huu

262
00:11:26,990 --> 00:11:29,984
hapa ni byte moja ambayo ni
yenye bits nane.

263
00:11:29,984 --> 00:11:32,900
Idadi hubadilika kutegemea
mfumo wa uendeshaji wa kompyuta yako.

264
00:11:32,900 --> 00:11:35,942
Kwa mfano, jinsi wengi wenu kuwa
kusikia 32-bit dhidi uendeshaji 64-bit

265
00:11:35,942 --> 00:11:36,441
mifumo?

266
00:11:36,441 --> 00:11:37,070
Hasa.

267
00:11:37,070 --> 00:11:38,860
>> Basi wote kwamba ni kusema
ni kwamba memory--

268
00:11:38,860 --> 00:11:42,420
kwa njia hiyo kwamba kompyuta yako
itaweza kumbukumbu ni tofauti.

269
00:11:42,420 --> 00:11:45,370
Ambayo ni kwa nini ni kweli
muhimu kuelewa

270
00:11:45,370 --> 00:11:49,450
nini majukumu ya kumbukumbu yenyewe badala
kuliko makini na namba.

271
00:11:49,450 --> 00:11:52,400
Kwa hiyo sisi si kweli huduma
jinsi kubwa safu hii

272
00:11:52,400 --> 00:11:55,710
ni, sisi tu haja ya huduma kuhusu
jinsi kubwa tunahitaji int kuwa,

273
00:11:55,710 --> 00:11:58,350
jinsi kubwa kufanya tunahitaji kamba
kuwa, jinsi kubwa ni pointer?

274
00:11:58,350 --> 00:12:00,630

275
00:12:00,630 --> 00:12:01,130
SAWA.

276
00:12:01,130 --> 00:12:03,690
Hivyo ni kwenda kuwa mengi
ya nzito, mnene habari.

277
00:12:03,690 --> 00:12:07,005
Mimi nina kwenda kukupa guys a
wanandoa Comic wakati misaada hapa.

278
00:12:07,005 --> 00:12:09,130
Nyie lazima wote kuwa na uwezo
kuelewa sasa.

279
00:12:09,130 --> 00:12:12,550
Kwa sababu tunajua kwamba
kuyatumia ni anwani,

280
00:12:12,550 --> 00:12:14,480
na wale ni tofauti na vigezo.

281
00:12:14,480 --> 00:12:14,980
SAWA.

282
00:12:14,980 --> 00:12:15,610
Baridi.

283
00:12:15,610 --> 00:12:17,065
CS utani ni bora, ndiyo?

284
00:12:17,065 --> 00:12:19,800

285
00:12:19,800 --> 00:12:23,450
>> Hivyo njia twende
juu ya kuunda pointer

286
00:12:23,450 --> 00:12:25,750
ni aina maalumu sana ya syntax.

287
00:12:25,750 --> 00:12:27,870
Kama ilivyo kwa kujenga yoyote
aina ya kutofautiana, ni

288
00:12:27,870 --> 00:12:30,240
kwenda kuwa maalum
syntax sisi kutumia ili kujenga yake.

289
00:12:30,240 --> 00:12:34,830
Hivyo wakati akitangaza pointer wowote,
pointer ni essentially--

290
00:12:34,830 --> 00:12:37,040
Nadhani muhimu
sehemu ya kuyatumia ni

291
00:12:37,040 --> 00:12:41,650
kwamba wakati kutofautiana ina
wote thamani na mitaani,

292
00:12:41,650 --> 00:12:44,100
pointer ni mahali.

293
00:12:44,100 --> 00:12:45,740
Thamani yake ni mahali.

294
00:12:45,740 --> 00:12:48,120
Hivyo ni kuhifadhiwa anuani
katika anwani tofauti.

295
00:12:48,120 --> 00:12:49,120
Kama kwamba inafanya hisia yoyote.

296
00:12:49,120 --> 00:12:52,390
Tutaweza kwenda juu hili kwa undani zaidi,
lakini hiyo ni aina ya kurefusha maisha

297
00:12:52,390 --> 00:12:54,370
ya why-- ya jinsi mashine ni kuhifadhiwa.

298
00:12:54,370 --> 00:12:58,900
>> Hivyo njia kwamba kujenga pointer
ni kwa kufanya aina yoyote ya data

299
00:12:58,900 --> 00:13:02,840
kwamba pointer ni kwenda
kuwa referencing na then--

300
00:13:02,840 --> 00:13:05,324
na star-- na kisha
jina la pointer.

301
00:13:05,324 --> 00:13:07,240
Hivyo hapa, kama sisi alitaka
kujenga pointer kwamba

302
00:13:07,240 --> 00:13:11,640
Alisema kuelekea integer, na sisi
alitaka jina la pointer kuwa x,

303
00:13:11,640 --> 00:13:13,880
tunataka kufanya int x nyota.

304
00:13:13,880 --> 00:13:14,380
Yeah?

305
00:13:14,380 --> 00:13:16,680
>> Watazamaji: Na hivyo kama
line zifuatazo wewe

306
00:13:16,680 --> 00:13:20,045
kufanya int x, mapenzi int x nyota
zinaonyesha eneo la x

307
00:13:20,045 --> 00:13:21,170
wewe ni kufafanua baadaye?

308
00:13:21,170 --> 00:13:22,000
>> ANDI PENG: Swali Kweli nzuri.

309
00:13:22,000 --> 00:13:23,860
Tutaweza kwenda juu katika hii
wanandoa slides baadaye.

310
00:13:23,860 --> 00:13:24,920
Naam.

311
00:13:24,920 --> 00:13:27,610
Na jambo moja na kisha
char na sawa ikifungwa kitu.

312
00:13:27,610 --> 00:13:29,950
Tu kujua kwamba katika hatua hii
tumeunda pointer,

313
00:13:29,950 --> 00:13:32,470
sisi si kweli kuweka
ni kwa sawa chochote bado.

314
00:13:32,470 --> 00:13:34,110
Sisi si kweli inatazamwa yake.

315
00:13:34,110 --> 00:13:36,087
Kitu kimoja hapa wakati
kujenga kutofautiana,

316
00:13:36,087 --> 00:13:39,420
umeunda jina la kutofautiana,
wewe si kweli kuweka thamani yake.

317
00:13:39,420 --> 00:13:41,410
Same kitu hapa.

318
00:13:41,410 --> 00:13:42,110
>> SAWA.

319
00:13:42,110 --> 00:13:44,670
Hivyo ni jinsi gani sisi kuweka maadili kwa kuyatumia?

320
00:13:44,670 --> 00:13:47,190
Ni kwa referencing na dereferencing.

321
00:13:47,190 --> 00:13:52,260
Hivyo njia kwamba tunaweza rejea
a varia-- pointer, kwa asili

322
00:13:52,260 --> 00:13:56,630
sisi kurudi anuani katika kumbukumbu
ambao kutofautiana ni kuhifadhiwa.

323
00:13:56,630 --> 00:14:02,550
Hivyo kama mimi alikuwa pointer mimi itabidi kuteka
hii mara moja sisi kupata slide ijayo,

324
00:14:02,550 --> 00:14:05,760
lakini tu kujua kwamba, kimsingi,
and-- ampersand

325
00:14:05,760 --> 00:14:10,240
na kutofautiana yote
anafanya ni kukuambia anuani

326
00:14:10,240 --> 00:14:11,780
ya ambapo kitu ni kuhifadhiwa.

327
00:14:11,780 --> 00:14:15,730
Na dereferencing ni kinyume
ya kwamba, ambayo ni tu nyota.

328
00:14:15,730 --> 00:14:18,950
Nyota tu anatoa halisi
data kuhifadhiwa katika anwani hiyo.

329
00:14:18,950 --> 00:14:21,090
>> Hivyo moja anatoa anuani
kuhifadhiwa katika mitaani,

330
00:14:21,090 --> 00:14:23,945
mengine anatoa halisi
thamani kuhifadhiwa katika mahali.

331
00:14:23,945 --> 00:14:25,820
Hivyo wawili kati yao kutoa
wewe mambo mbalimbali.

332
00:14:25,820 --> 00:14:27,755

333
00:14:27,755 --> 00:14:29,880
Kwa mara nyingine tena, slides ni
yote online hivyo hakuna wasiwasi

334
00:14:29,880 --> 00:14:33,200
kama nyie hawawezi nakala
chini hii kwa wakati.

335
00:14:33,200 --> 00:14:36,330
>> Hivyo hebu tuangalie
katika mfano huu hapa.

336
00:14:36,330 --> 00:14:40,530
Hivyo sisi tumepewa kubwa
kumbukumbu safu hapa, sawa?

337
00:14:40,530 --> 00:14:42,920
Ambapo sisi tu vitalu ya
, au kumbukumbu ka ya kumbukumbu,

338
00:14:42,920 --> 00:14:45,060
ambayo tunaweza kuhifadhi vitu mbalimbali.

339
00:14:45,060 --> 00:14:47,310
Hebu sema tu hizi ni
anuani pointi katika kumbukumbu.

340
00:14:47,310 --> 00:14:51,350
Hivyo wakati wowote una - tazama 0x,
kwamba wote ni nawaambia ni kwamba

341
00:14:51,350 --> 00:14:52,930
hiyo ni ya tarakimu hexadesimoli.

342
00:14:52,930 --> 00:14:56,310
Kama nyie wote tunajua, idadi
inaweza kuwa msingi katika misingi mbalimbali.

343
00:14:56,310 --> 00:14:58,770
Msingi 10 ni jinsi sisi kawaida
kutafsiri namba.

344
00:14:58,770 --> 00:15:00,550
Kuna pia msingi 2, ambayo ni mapacha.

345
00:15:00,550 --> 00:15:03,366
Na katika kesi hii,
hexadecimal ni msingi 16.

346
00:15:03,366 --> 00:15:06,240
Ni tu njia tofauti ya kusema
kutoka sifuri kwa 10-- au sifuri hadi tisa

347
00:15:06,240 --> 00:15:10,904
na kisha pia, B, C, D, E, F.
Pia marejeo namba mbalimbali.

348
00:15:10,904 --> 00:15:12,570
Daudi akaenda ng'ambo hii katika hotuba kwa ufupi.

349
00:15:12,570 --> 00:15:14,280
Kama nyie ni
kuchanganyikiwa, tu Google ni.

350
00:15:14,280 --> 00:15:17,370
Kuna njia kweli rahisi kujifunza
nini tarakimu hexadesimoli ni.

351
00:15:17,370 --> 00:15:19,510
Wote kwamba ni kweli muhimu
sasa hivi ni kwa ajili yenu

352
00:15:19,510 --> 00:15:24,170
guys kujua kwamba a
hexadecimal tarakimu katika C

353
00:15:24,170 --> 00:15:27,090
anaelezea you-- kwamba kwa kawaida
atakwambia kwamba ni pointer.

354
00:15:27,090 --> 00:15:29,150
Au kwamba ni mahali.

355
00:15:29,150 --> 00:15:33,310
>> Hivyo katika mfano huu hapa, int x sawa 5.

356
00:15:33,310 --> 00:15:36,350
Sisi ni kujenga integer--
pole, kutofautiana wa aina

357
00:15:36,350 --> 00:15:39,090
integer na sisi ni initializing yake kwa 5.

358
00:15:39,090 --> 00:15:47,040
Hivyo hapa juu ya kumbukumbu bodi yetu, tunaweza
kuona kwamba x ni kwa anwani ya 0x0

359
00:15:47,040 --> 00:15:50,550
na thamani kwamba wameweza
kuhifadhiwa ndani yake ni 5.

360
00:15:50,550 --> 00:15:52,370
Kwamba lazima kufanya maana
kwa kila mtu, sawa?

361
00:15:52,370 --> 00:15:53,030
SAWA.

362
00:15:53,030 --> 00:15:56,520
>> Na kisha kile ambacho tumefanya
katika mstari wa pili wa kanuni

363
00:15:56,520 --> 00:16:00,290
ni kwamba tumeunda
pointer ya aina int.

364
00:16:00,290 --> 00:16:02,750
Hiyo ni nini int
nyota pointer ni kufanya.

365
00:16:02,750 --> 00:16:07,320
Na kwamba ni sawa na kwamba ampersand x
ni kutoa pepe ya kitu fulani.

366
00:16:07,320 --> 00:16:12,120
Hivyo pepe ya x katika
mfano huu ni 0x0.

367
00:16:12,120 --> 00:16:15,630
Na hivyo anwani hiyo ni kuwa
kuhifadhiwa katika kwamba pointer.

368
00:16:15,630 --> 00:16:17,360
Je, hiyo mantiki kwa kila mtu?

369
00:16:17,360 --> 00:16:19,965
>> Hivyo kufikiria Haya
kufikiria pointers-- hapa

370
00:16:19,965 --> 00:16:24,780
katika Yale tuna mfumo SLP
ambapo kila mwanafunzi ana barua

371
00:16:24,780 --> 00:16:26,960
kushughulikia ambapo unaweza kwenda
ndani ya basement ya LW

372
00:16:26,960 --> 00:16:30,492
na unaweza tu kwenda na kunyakua
chochote unahitaji kutoka anwani hiyo.

373
00:16:30,492 --> 00:16:32,450
Kitu kimoja kinachotokea
hapa katika kompyuta.

374
00:16:32,450 --> 00:16:36,770
Una ka hizo kumbukumbu kwamba
unaweza kuhifadhi habari katika,

375
00:16:36,770 --> 00:16:39,529
lakini ili kujua ambayo
vipande vya taarifa

376
00:16:39,529 --> 00:16:42,570
match up ya kile wewe ni kujaribu kupata
na wapi, unahitaji pointer kwamba

377
00:16:42,570 --> 00:16:43,740
anaelezea jinsi ya kwenda huko.

378
00:16:43,740 --> 00:16:47,270
>> Hivyo kwa mfano, kwa ajili yangu, PO wangu sanduku,
Nina maalum tano tarakimu idadi.

379
00:16:47,270 --> 00:16:48,400
Hiyo ni anwani yangu.

380
00:16:48,400 --> 00:16:51,880
Hivyo siwezi kimwili kwenda kumbukumbu,
Siwezi kuangalia mitaani,

381
00:16:51,880 --> 00:16:54,507
Naweza kwenda kuwa SLP
na kupata data ndani.

382
00:16:54,507 --> 00:16:57,090
Je, hiyo mantiki Kila mtu
Kompyuta yako ni kimsingi

383
00:16:57,090 --> 00:16:59,000
kufanya exact kitu.

384
00:16:59,000 --> 00:17:02,750
>> Basi wote pointer ni kufanya ni kwamba
ni kujenga kumbukumbu tu

385
00:17:02,750 --> 00:17:06,099
na takwimu zake kumbukumbu ni kweli
pepe ya kitu kingine.

386
00:17:06,099 --> 00:17:08,210
Basi unaweza kwenda na kupata hiyo.

387
00:17:08,210 --> 00:17:09,060
Kila mtu mwema?

388
00:17:09,060 --> 00:17:10,720
Kila mtu mzuri na mimi hadi sasa?

389
00:17:10,720 --> 00:17:11,360
SAWA.

390
00:17:11,360 --> 00:17:11,859
Baridi.

391
00:17:11,859 --> 00:17:14,311

392
00:17:14,311 --> 00:17:14,810
Sawa.

393
00:17:14,810 --> 00:17:19,160
Hivyo karibu kitu kimoja kama kabla.

394
00:17:19,160 --> 00:17:23,849
Hivyo tuna, kwanza, kutofautiana
kuitwa x ambao case--

395
00:17:23,849 --> 00:17:27,700
Mimi nina kwenda na mabadiliko ya thamani huu kwa 5.

396
00:17:27,700 --> 00:17:31,820
Hebu tu kusema anuani
ya hii katika kumbukumbu ni 0x0.

397
00:17:31,820 --> 00:17:33,070
00.

398
00:17:33,070 --> 00:17:33,570
Kubwa.

399
00:17:33,570 --> 00:17:35,320
>> Hivyo basi, juu ya pili yetu
mstari wa kanuni, tuko

400
00:17:35,320 --> 00:17:41,210
kwenda kujenga pointer
aitwaye PTR pointer.

401
00:17:41,210 --> 00:17:45,760
Na anuani ya kwamba, hebu
tu kusema kwamba ni 0x01 katika kumbukumbu.

402
00:17:45,760 --> 00:17:48,280
Na sisi kweli wanataka
store-- ampersand

403
00:17:48,280 --> 00:17:50,620
x anatoa pepe ya nini x alikuwa.

404
00:17:50,620 --> 00:17:53,990
Na anuani ya x ilikuwa 0x00.

405
00:17:53,990 --> 00:17:57,300
Hivyo pointer hii sasa
kweli ina anuani

406
00:17:57,300 --> 00:18:00,210
kuhifadhiwa kama thamani yake ya kile x ilikuwa.

407
00:18:00,210 --> 00:18:01,700
Kila mtu na mimi hadi sasa?

408
00:18:01,700 --> 00:18:02,320
Baridi.

409
00:18:02,320 --> 00:18:04,670
>> Na kisha, kwa njia hiyo
tunataka nakala hiyo,

410
00:18:04,670 --> 00:18:09,650
ni kama tunataka kutangaza na initialize
kuzuia nyingine ya kumbukumbu ya aina int.

411
00:18:09,650 --> 00:18:10,150
Sawa?

412
00:18:10,150 --> 00:18:11,130
Hii itakuwa int.

413
00:18:11,130 --> 00:18:14,130
Itakuwa kuitwa nakala.

414
00:18:14,130 --> 00:18:17,120
Na wewe ni kwenda get-- hivyo
nyota pointer anatoa

415
00:18:17,120 --> 00:18:19,080
data halisi kutoka anwani hiyo.

416
00:18:19,080 --> 00:18:22,490
Ampersand anatoa mitaani,
nyota anatoa data.

417
00:18:22,490 --> 00:18:24,630
Hivyo data kwenye pointer.

418
00:18:24,630 --> 00:18:29,420
Pointer hii ni akizungumzia 5.

419
00:18:29,420 --> 00:18:33,140
Na hivyo kazi hii
here-- nyota pointer

420
00:18:33,140 --> 00:18:39,740
unaendelea, anapata vilivyomo katika
kuzuia hili na maduka hapa.

421
00:18:39,740 --> 00:18:41,730
Kila mtu wazi juu ya jinsi yaliyotokea?

422
00:18:41,730 --> 00:18:45,490
>> Hivyo waendeshaji mbili haki there--
ampersand na star--

423
00:18:45,490 --> 00:18:48,250
tu kufanya mambo mbalimbali
wakati kutumika juu ya kuyatumia.

424
00:18:48,250 --> 00:18:50,837
Moja anapata mitaani, moja
anapata thamani halisi.

425
00:18:50,837 --> 00:18:53,670
Ili kuhakikisha wakati nyie ni
coding kwamba usiwachanganye mbili

426
00:18:53,670 --> 00:18:55,650
kwa sababu wao ni tofauti kabisa.

427
00:18:55,650 --> 00:18:58,880
Hapa tuna mfano mzuri wa 0x01.

428
00:18:58,880 --> 00:19:01,207
Hiyo ni kweli nzuri
idadi ndogo kukumbuka.

429
00:19:01,207 --> 00:19:03,040
Katika kompyuta yako halisi
wewe ni kwenda na

430
00:19:03,040 --> 00:19:06,740
kubwa punda idadi hiyo ni kitu
si kwamba nzuri, si mazuri.

431
00:19:06,740 --> 00:19:08,280
Ni kwenda kuwa baadhi ya thamani ya takataka.

432
00:19:08,280 --> 00:19:10,920
Na hivyo ni kwenda kweli,
kweli fujo up programu yako.

433
00:19:10,920 --> 00:19:12,670
Ni muhimu sana
sasa hivi kwamba tuna

434
00:19:12,670 --> 00:19:16,150
misingi chini kwa why-- kama,
kile kinachotokea wakati kimwili

435
00:19:16,150 --> 00:19:18,270
wewe ni mbio vitalu wale wa kanuni.

436
00:19:18,270 --> 00:19:19,120
Everyone-- yeah?

437
00:19:19,120 --> 00:19:21,425
>> Watazamaji: Hivyo int x sawa int nakala?

438
00:19:21,425 --> 00:19:24,650

439
00:19:24,650 --> 00:19:34,970
>> ANDI PENG: Hakuna sababu, katika kesi hii, int
x-- thamani ya x-- sawa na 5, sawa?

440
00:19:34,970 --> 00:19:40,546
Na kisha int nakala sawa na 5.

441
00:19:40,546 --> 00:19:43,420
Hivyo kama ungekuwa equate yao kwa
kila mmoja kwa sababu wao ni integers,

442
00:19:43,420 --> 00:19:46,379
ndiyo, wangeweza kutathmini kwa kweli.

443
00:19:46,379 --> 00:19:49,670
Lakini kama walikuwa masharti katika kumbukumbu, kama
moja kwamba Daudi alifanya wakati wa mfano,

444
00:19:49,670 --> 00:19:51,670
hiyo ni tofauti kwa sababu
re referencing

445
00:19:51,670 --> 00:19:54,920
anwani ya maeneo katika kumbukumbu
na wangeweza equate na uongo.

446
00:19:54,920 --> 00:20:00,070
>> Hivyo hapa itakuwa kweli kwa sababu wewe ni
moja kwa moja kulinganisha values-- integers--

447
00:20:00,070 --> 00:20:02,240
lakini kwa wengine uko
referencing pointi.

448
00:20:02,240 --> 00:20:05,290
Kwa sababu kamba ni katika safu, na
all-- tutaweza majadiliano juu ya hii later--

449
00:20:05,290 --> 00:20:09,940
lakini safu ni kimsingi tu
pointer kwa kundi la chars katika kumbukumbu.

450
00:20:09,940 --> 00:20:11,610
Basi hizo tofauti kidogo.

451
00:20:11,610 --> 00:20:14,642
Lakini katika kesi hii, ndiyo,
unaweza kufanya hivyo.

452
00:20:14,642 --> 00:20:17,354
>> Watazamaji: Je, unaweza kueleza
pepe ya nakala?

453
00:20:17,354 --> 00:20:18,020
ANDI PENG: Naam.

454
00:20:18,020 --> 00:20:20,030
Hivyo hiyo ni just-- mimi
hakuwa kujaza thamani

455
00:20:20,030 --> 00:20:23,022
lakini ni baadhi tu random mengine
takataka thamani kwamba hatuna huduma ya juu.

456
00:20:23,022 --> 00:20:25,730
Kwa sababu mara tu kuanza mpango
wewe kutambua kwamba sisi si kweli

457
00:20:25,730 --> 00:20:28,150
kweli huduma nini
anwani halisi ni,

458
00:20:28,150 --> 00:20:30,470
sisi tu haja ya kujua
nini katika anwani.

459
00:20:30,470 --> 00:20:31,608
Naam.

460
00:20:31,608 --> 00:20:36,034
>> Watazamaji: nyota karibu na int juu ya
mstari wa pili, hiyo ni than-- tofauti

461
00:20:36,034 --> 00:20:36,700
ANDI PENG: Naam.

462
00:20:36,700 --> 00:20:39,015
Watazamaji: --the dereferencing
na referencing nyota?

463
00:20:39,015 --> 00:20:39,681
ANDI PENG: Naam.

464
00:20:39,681 --> 00:20:43,180
Hivyo waandishi wa C-- yeyote
aliamua kuandika lugha ya C--

465
00:20:43,180 --> 00:20:44,200
Haikuwa smart sana.

466
00:20:44,200 --> 00:20:46,830
Hawakuwa smart sana katika kujaribu
kufikiri kwa nini tunapaswa kufanya hivyo.

467
00:20:46,830 --> 00:20:49,413
Kama ilivyokuwa kwangu, napenda dhahiri
kutumia herufi mbili tofauti.

468
00:20:49,413 --> 00:20:52,100
Lakini waliamua kutumia moja moja.

469
00:20:52,100 --> 00:20:56,607
>> Hivyo nyota baada int,
kwamba anaelezea kompyuta

470
00:20:56,607 --> 00:20:58,190
kwamba wewe ni kuhusu kuunda pointer.

471
00:20:58,190 --> 00:21:00,820
Lakini kama wewe ni kujaribu dereference
something-- kwa maneno mengine,

472
00:21:00,820 --> 00:21:03,780
kwenda anwani na kuvuta
data kutoka somewhere--

473
00:21:03,780 --> 00:21:05,070
nyota ni kutumika kwa njia tofauti.

474
00:21:05,070 --> 00:21:08,750
Hivyo nyie tu kuwa makini kuhusu
si messing up matumizi mawili.

475
00:21:08,750 --> 00:21:09,870
Baridi.

476
00:21:09,870 --> 00:21:10,605
Yeah?

477
00:21:10,605 --> 00:21:14,680
>> Watazamaji: Hivyo tu kurudia kwa
kuhakikisha kwamba mimi nina following--

478
00:21:14,680 --> 00:21:16,252
>> ANDI PENG: Kabisa faini.

479
00:21:16,252 --> 00:21:20,491
>> Watazamaji: --in upande wa mkono wa kushoto wa
kwamba slide, tunafanya jambo ambalo tunajua.

480
00:21:20,491 --> 00:21:23,124
Tunatangaza integer
[Inaudible] ambazo ni sawa na 5.

481
00:21:23,124 --> 00:21:23,790
ANDI PENG: Naam.

482
00:21:23,790 --> 00:21:24,456
Watazamaji: Haki.

483
00:21:24,456 --> 00:21:28,960
Na kisha tuna kitu int nyota na
inayosema kwamba, sawa, aina ya kama sisi

484
00:21:28,960 --> 00:21:31,235
alitangaza integer, sasa
sisi ni kutangaza pointer.

485
00:21:31,235 --> 00:21:32,110
ANDI PENG: Usahihi.

486
00:21:32,110 --> 00:21:32,410
Sahihi.

487
00:21:32,410 --> 00:21:32,710
>> Watazamaji: Haki?

488
00:21:32,710 --> 00:21:33,870
Na pointer wetu ni PTR.

489
00:21:33,870 --> 00:21:34,080
>> ANDI PENG: Yep.

490
00:21:34,080 --> 00:21:35,460
Jina la pointer ni PTR.

491
00:21:35,460 --> 00:21:35,959
Pointer.

492
00:21:35,959 --> 00:21:39,000
Watazamaji: Na kisha
sawa nx kwamba tu anasema C

493
00:21:39,000 --> 00:21:44,667
kwamba anataka kupata thamani katika
integer x-- thamani kwamba integer x

494
00:21:44,667 --> 00:21:45,800
ilikuwa kwa ajili.

495
00:21:45,800 --> 00:21:49,050
>> ANDI PENG: Kuwa makini
kwa sababu ampersand x kweli

496
00:21:49,050 --> 00:21:53,120
anasema kompyuta you-- kwamba
wanataka kuvuta pepe ya nini x ni.

497
00:21:53,120 --> 00:21:56,350
Hivyo ampersand anatoa
mitaani, nyota anatoa thamani.

498
00:21:56,350 --> 00:21:58,255
>> Watazamaji: Hivyo tunataka mahali.

499
00:21:58,255 --> 00:22:02,075
Hebu sema x ilikuwa at--

500
00:22:02,075 --> 00:22:03,950
ANDI PENG: Sisi kwa kweli
kujua nini x ni, sawa?

501
00:22:03,950 --> 00:22:06,790
Kwa sababu tunajua kwamba x was-- mimi nina
kufanya hii juu lakini hebu sema tu,

502
00:22:06,790 --> 00:22:08,760
kiholela, ilikuwa 0x00.

503
00:22:08,760 --> 00:22:09,590
Sawa?

504
00:22:09,590 --> 00:22:14,120
Hivyo tunajua anwani ni 0x00,
na hivyo wakati sisi kwenda na ampersand x,

505
00:22:14,120 --> 00:22:17,050
Tunajua kwamba kuwa
lazima kutathmini kwa 0x00.

506
00:22:17,050 --> 00:22:20,810
Ambayo ni kwa nini sisi kuhifadhiwa kwamba
kama thamani ya pointer yetu.

507
00:22:20,810 --> 00:22:21,924
Je, hiyo mantiki?

508
00:22:21,924 --> 00:22:22,832
>> Watazamaji: Ndiyo.

509
00:22:22,832 --> 00:22:28,057
Na nakala huenda kwa dereference ptr--

510
00:22:28,057 --> 00:22:28,765
ANDI PENG: Haki.

511
00:22:28,765 --> 00:22:30,473
Watazamaji: --which ni
pointer kwamba tumekuwa

512
00:22:30,473 --> 00:22:35,220
alitangaza kwamba inatuambia
pepe ya integer x.

513
00:22:35,220 --> 00:22:36,160
>> ANDI PENG: Naam.

514
00:22:36,160 --> 00:22:39,272
>> Watazamaji: Na katika hili
kesi moja, nyota PTR ni

515
00:22:39,272 --> 00:22:41,256
sawa na thamani ya x ambayo ni sawa na 5.

516
00:22:41,256 --> 00:22:42,744
>> ANDI PENG: Sahihi.

517
00:22:42,744 --> 00:22:44,728
>> Watazamaji: Moto.

518
00:22:44,728 --> 00:22:49,382
Na kwamba ni njia rahisi ya kupata
kuwa au ni kwamba tu way--

519
00:22:49,382 --> 00:22:51,840
ANDI PENG: Kwa hiyo hivi sasa ni
haionekani mantiki sana kwa ajili yetu

520
00:22:51,840 --> 00:22:54,690
kwa kutumia yote ya wakati huu kufanya
hii kitu super ngumu wakati

521
00:22:54,690 --> 00:22:57,606
zote tumefanya ni kuunda wawili tu
integers kwa thamani ya 5, sawa?

522
00:22:57,606 --> 00:22:58,900
Ni haina mantiki.

523
00:22:58,900 --> 00:23:03,060
Lakini mara tutaweza kwenda juu
mgao kumbukumbu and-- tutaweza

524
00:23:03,060 --> 00:23:06,067
kwenda juu kwa nini hii inaweza kuwa
Handy na manufaa baadaye.

525
00:23:06,067 --> 00:23:09,150
Matumaini yangu wakati mimi kusema hatuna tu
kujenga kazi hizi holela kwa wewe

526
00:23:09,150 --> 00:23:11,340
guys kujifunza kwa sababu tuko
kujaribu kwa fujo na wewe.

527
00:23:11,340 --> 00:23:14,550
Kuna kweli anatumia kwa yote haya
mambo na sisi majadiliano kuhusu wao.

528
00:23:14,550 --> 00:23:14,950
>> Watazamaji: Ajabu.

529
00:23:14,950 --> 00:23:15,350
>> ANDI PENG: Naam.

530
00:23:15,350 --> 00:23:16,150
>> Watazamaji: [inaudible].

531
00:23:16,150 --> 00:23:16,450
>> ANDI PENG: Swali Mwema.

532
00:23:16,450 --> 00:23:17,510
>> Watazamaji: [inaudible].

533
00:23:17,510 --> 00:23:18,000
>> ANDI PENG: Siyo.

534
00:23:18,000 --> 00:23:18,666
Ni kweli si.

535
00:23:18,666 --> 00:23:21,050
Watazamaji: vigezo --two
kwamba pia sawa [inaudible].

536
00:23:21,050 --> 00:23:22,400
SAWA.

537
00:23:22,400 --> 00:23:23,070
>> ANDI PENG: Naam.

538
00:23:23,070 --> 00:23:23,570
SAWA.

539
00:23:23,570 --> 00:23:25,249
Kabla ya kusonga mbele, ni wote wa wazi?

540
00:23:25,249 --> 00:23:26,790
Najua Taylor, wewe got katika kidogo marehemu.

541
00:23:26,790 --> 00:23:27,490
Ni sawa.

542
00:23:27,490 --> 00:23:28,100
Ni online.

543
00:23:28,100 --> 00:23:30,600
Itabidi kuangalia kwanza 20
dakika na wewe utakuwa na kila tendo jema.

544
00:23:30,600 --> 00:23:31,190
SAWA.

545
00:23:31,190 --> 00:23:31,690
Baridi.

546
00:23:31,690 --> 00:23:35,597

547
00:23:35,597 --> 00:23:37,140
>> Sawa.

548
00:23:37,140 --> 00:23:41,270
Hivyo hii ni kimsingi aina ya
jambo kama hilo kwamba sisi tu alivyofanya.

549
00:23:41,270 --> 00:23:43,100
Ni tu katika fomu graphical.

550
00:23:43,100 --> 00:23:47,070
Kama ungekuwa na kufuatilia nini
ilitokea tu, int x sawa 5,

551
00:23:47,070 --> 00:23:52,159
zote tumefanya katika hatua hii ni
kujenga kutofautiana aitwaye x ya aina int.

552
00:23:52,159 --> 00:23:54,200
Tunakwenda kuhifadhi
thamani ya 5 ndani yake.

553
00:23:54,200 --> 00:23:57,366
Hakuna pointer kwa sababu tuna si
kweli kuundwa pointer bado, sawa?

554
00:23:57,366 --> 00:24:00,302
Na kisha katika ijayo
mstari, int nyota pointer,

555
00:24:00,302 --> 00:24:02,760
hapo ndipo sisi ni kweli
kimwili kujenga pointer

556
00:24:02,760 --> 00:24:05,010
na sisi ni kuweka kwamba
sawa na, au referencing

557
00:24:05,010 --> 00:24:07,250
pointer, kwa ampersand x.

558
00:24:07,250 --> 00:24:10,002
Ambayo ni ambapo popote katika
kumbukumbu hii ilitokea kuwa.

559
00:24:10,002 --> 00:24:12,210
Sikuwa kweli kujisumbua
maamuzi juu ya thamani wakati huu.

560
00:24:12,210 --> 00:24:14,900
Lakini katika kesi hii, hatua hiyo
ungekuwa sawa na ile.

561
00:24:14,900 --> 00:24:18,060
>> Na kisha chini huko, nyota
pointer ni dereferencing.

562
00:24:18,060 --> 00:24:20,310
Hiyo ambapo sisi ni
kuunganisha habari.

563
00:24:20,310 --> 00:24:24,170
Hivyo kwamba thamani katika x ni kweli
kwenda kuwa sawa na 35.

564
00:24:24,170 --> 00:24:30,390
Hivyo katika hatua hii, tumekuwa kimsingi
tu reinitialized x kwa 35

565
00:24:30,390 --> 00:24:32,320
bila ya kweli kugusa x.

566
00:24:32,320 --> 00:24:34,560
Tu kwa njia ya pointer
kwamba alikuwa akizungumzia x,

567
00:24:34,560 --> 00:24:36,910
sisi kweli unaweza kubadilisha nini x alikuwa.

568
00:24:36,910 --> 00:24:38,420
Mimi nina kwenda kuteka hii nje pia.

569
00:24:38,420 --> 00:24:52,200
>> Hivyo hapa tumeunda
baadhi anuani random hapa.

570
00:24:52,200 --> 00:24:54,734
Hebu tu kusema 0x00 tena.

571
00:24:54,734 --> 00:24:56,150
Hebu tu kusema kwamba ni mahali.

572
00:24:56,150 --> 00:25:00,830
Na tumeunda integer aitwaye x
na thamani nimekuwa ajili ya ni 5.

573
00:25:00,830 --> 00:25:03,840
Katika mstari wa pili, int
pointer hivyo sasa tumekuwa

574
00:25:03,840 --> 00:25:07,820
got jambo hili la pili
hapa aitwaye pointer

575
00:25:07,820 --> 00:25:14,310
na tunakwenda to-- hebu sema tu
ni baadhi ya wengine bila mpangilio kumbukumbu ya mahali.

576
00:25:14,310 --> 00:25:18,460
>> Hivyo sisi ni kwenda kuweka hii
sawa na chochote kwamba alikuwa.

577
00:25:18,460 --> 00:25:21,540

578
00:25:21,540 --> 00:25:25,880
Na pointer hii ni kwenda
kuelekezea thamani ya x

579
00:25:25,880 --> 00:25:30,090
Na kisha, kama sisi mabadiliko
the-- kama sisi kufanya nyota pointer,

580
00:25:30,090 --> 00:25:32,800
ambayo inaenda
thamani ya pointer yetu.

581
00:25:32,800 --> 00:25:36,979
Katika kesi hiyo, ni kwenda kufuatilia
huu mshale juu ya thamani hii ya x

582
00:25:36,979 --> 00:25:38,395
na ni kwenda mabadiliko hayo kwa 35.

583
00:25:38,395 --> 00:25:41,400

584
00:25:41,400 --> 00:25:44,760
Kwa ufanisi, sisi tu iliyopita
x bila kugusa x.

585
00:25:44,760 --> 00:25:48,970
Kupitia referencing tu kuyatumia,
tunaweza kwenda na mabadiliko ya thamani ya x.

586
00:25:48,970 --> 00:25:50,050
Je, hiyo mantiki?

587
00:25:50,050 --> 00:25:55,200
>> Hivyo kwa njia hii, tunaweza kweli kubadili jina
na rechange na reassign maadili

588
00:25:55,200 --> 00:25:57,750
kwa mambo ambayo hatukuwa
kweli kufanya sisi wenyewe.

589
00:25:57,750 --> 00:26:00,925
Je, hiyo mantiki kwa kila mtu?

590
00:26:00,925 --> 00:26:01,425
Baridi.

591
00:26:01,425 --> 00:26:04,450

592
00:26:04,450 --> 00:26:05,310
SAWA.

593
00:26:05,310 --> 00:26:08,210
Hivyo tata mchoro hapa.

594
00:26:08,210 --> 00:26:09,360
Kwenda mstari kwa mstari.

595
00:26:09,360 --> 00:26:12,055
Kimsingi, tu kufanya halisi
kitu kimoja kwamba mimi tu alifanya.

596
00:26:12,055 --> 00:26:15,977

597
00:26:15,977 --> 00:26:17,810
Kabla ya kusonga mbele, mimi
kweli wanataka tu kufanya

598
00:26:17,810 --> 00:26:19,370
kuhakikisha kwamba kila mtu kweli wazi juu ya hili.

599
00:26:19,370 --> 00:26:26,260
Hivyo hapa, kanuni na kwamba tuna ni
int a sawa na 3, b sawa na 4, c sawa na 5.

600
00:26:26,260 --> 00:26:33,130
Hivyo tumeunda integers tatu aitwaye
a, b na c kwamba ni sawa na 3, 4 na 5.

601
00:26:33,130 --> 00:26:38,460
Na kisha sisi ni kujenga kuyatumia tatu
hatua hiyo kwa kila moja ya vigezo hizo.

602
00:26:38,460 --> 00:26:41,760
>> Na sasa tunakwenda
kwenda juu ya kimsingi

603
00:26:41,760 --> 00:26:44,240
kile kinachotokea wakati kazi juu yao.

604
00:26:44,240 --> 00:26:45,490
Hivyo kuteka yao nje.

605
00:26:45,490 --> 00:26:48,156
Kuchukua karatasi ya paper-- mimi si
kujua kama nyie wote wana karatasi,

606
00:26:48,156 --> 00:26:50,930
lakini wale ambao hawana, labda
kukopa kutoka wale ambao kufanya.

607
00:26:50,930 --> 00:26:53,580
Kuchukua karatasi
na kwenda mstari kwa mstari.

608
00:26:53,580 --> 00:26:59,390
Na katika kila kazi kwamba kufanya,
Nataka nyie kweli kuandika nje

609
00:26:59,390 --> 00:27:00,800
kile ni, b na c katika hatua hii.

610
00:27:00,800 --> 00:27:03,550
Na nini ni anwani, nini ni
kuyatumia kwamba uhakika na b na c

611
00:27:03,550 --> 00:27:04,410
katika hatua hii?

612
00:27:04,410 --> 00:27:07,150
>> Na kisha hopefully hii
itakuwa aina ya hatua nyie

613
00:27:07,150 --> 00:27:08,900
kupitia jinsi ya kufikiri juu ya kuyatumia.

614
00:27:08,900 --> 00:27:10,650
Sisi siyo kwenda
njia zote za kwao.

615
00:27:10,650 --> 00:27:13,450
Labda mimi nitakupa five--
kama, dakika tatu.

616
00:27:13,450 --> 00:27:14,660
Kupata kuanza juu ya kwanza wachache.

617
00:27:14,660 --> 00:28:10,410

618
00:28:10,410 --> 00:28:10,959
Loo.

619
00:28:10,959 --> 00:28:11,459
Oops.

620
00:28:11,459 --> 00:28:20,940

621
00:28:20,940 --> 00:28:26,950
>> Watazamaji: Katika mstari wa pili, kwa nini
si nyota [inaudible] kutofautiana?

622
00:28:26,950 --> 00:28:29,410
>> ANDI PENG: Kumbuka katika
waendeshaji, katika wiki ya kwanza,

623
00:28:29,410 --> 00:28:31,730
kuongelea jinsi
mkifanya sawa pamoja,

624
00:28:31,730 --> 00:28:35,320
kwamba tu ina maana sawa na pamoja c.

625
00:28:35,320 --> 00:28:39,370
Katika hili case-- hivyo hii ni mwingine
njia ambayo nyota zinaweza kutumika.

626
00:28:39,370 --> 00:28:42,040
Mbali na referencing
na kutangaza kuyatumia,

627
00:28:42,040 --> 00:28:44,440
kukumbuka kwamba pia
ina maana kuzidisha.

628
00:28:44,440 --> 00:28:46,575
Hivyo katika kesi hii, ni d tu
kuwa sawa na nyakati c.

629
00:28:46,575 --> 00:28:48,450
Hiyo tu kama tofauti
njia ya kuandika kwamba.

630
00:28:48,450 --> 00:28:49,776
>> Watazamaji: sawa mara c.

631
00:28:49,776 --> 00:28:50,442
ANDI PENG: Naam.

632
00:28:50,442 --> 00:30:43,488

633
00:30:43,488 --> 00:30:47,130
>> Watazamaji: Ni nini maana ikiwa
inasema ampersand barua?

634
00:30:47,130 --> 00:30:50,900
>> ANDI PENG: Ampersand njia
wewe ni kwenda that-- uko

635
00:30:50,900 --> 00:30:54,760
kwenda mahali pointer ni
akizungumzia na kuunganisha mahali.

636
00:30:54,760 --> 00:31:01,270
Hivyo ampersand anatoa mitaani,
nyota anatoa thamani halisi huko.

637
00:31:01,270 --> 00:31:03,090
>> Watazamaji: Je, sisi
kujenga juu ya mstari kwa mstari?

638
00:31:03,090 --> 00:31:04,881
>> ANDI PENG: Wewe
kujenga juu ya mstari kwa mstari.

639
00:31:04,881 --> 00:31:07,260
Hivyo tu kwenda mstari mmoja katika
muda na then-- wewe

640
00:31:07,260 --> 00:31:08,470
si kuwa na wasiwasi kuhusu
kumaliza jambo zima.

641
00:31:08,470 --> 00:31:10,428
Hebu jaribu kupata kupitia
labda mbili, mistari mitatu

642
00:31:10,428 --> 00:31:12,445
na kisha tutaweza kuitisha na kumaliza hii.

643
00:31:12,445 --> 00:31:15,530

644
00:31:15,530 --> 00:31:17,470
>> Ni kabisa OK ikiwa nyie ni waliopotea.

645
00:31:17,470 --> 00:31:19,334
Hii ni dhana ngumu kweli kweli.

646
00:31:19,334 --> 00:31:22,500
Kama nyie ni wasiwasi kwamba daraja la
huenda kama hii kama Daudi alikuwa akisema,

647
00:31:22,500 --> 00:31:23,190
haina.

648
00:31:23,190 --> 00:31:25,949
Sisi ni kufikia
dhana kilele cha ugumu

649
00:31:25,949 --> 00:31:27,740
na kisha itakuja
kuwa kushuka sloping.

650
00:31:27,740 --> 00:31:29,110
Hivyo nyie ni karibu na hapo.

651
00:31:29,110 --> 00:31:31,080
Sisi wana kura ya pipi kupata
nyie kupitia nundu.

652
00:31:31,080 --> 00:31:32,940
Nadhani pretty much baada ya kuanguka
kuvunja tutaweza kuwa juu ya nundu

653
00:31:32,940 --> 00:31:34,220
na maisha itakuwa vizuri tena.

654
00:31:34,220 --> 00:31:36,580
Hivyo hakuna wasiwasi wakati wote.

655
00:31:36,580 --> 00:32:30,732

656
00:32:30,732 --> 00:32:31,232
Sawa.

657
00:32:31,232 --> 00:32:33,650
Mimi nitakupa guys 20
sekunde zaidi wa kufuta.

658
00:32:33,650 --> 00:33:12,560

659
00:33:12,560 --> 00:33:13,330
SAWA.

660
00:33:13,330 --> 00:33:13,830
Sawa.

661
00:33:13,830 --> 00:33:16,370
Hebu kuchukua kumchoma katika hili.

662
00:33:16,370 --> 00:33:19,430
Kama nyie nipe majibu,
Mimi tu kwenda kwa aina yao katika.

663
00:33:19,430 --> 00:33:22,140
Na pengine we-- Unaweza mimi?

664
00:33:22,140 --> 00:33:23,317
Mimi kwa kweli hawawezi aina yake katika.

665
00:33:23,317 --> 00:33:24,400
Mimi itabidi kuteka ni juu ya bodi.

666
00:33:24,400 --> 00:33:31,420

667
00:33:31,420 --> 00:33:35,900
>> Hivyo hapa katika mstari huu kwanza
tuna sawa na b nyota c.

668
00:33:35,900 --> 00:33:38,060
Pia Elliot kulelewa
kweli, hatua nzuri kwa kweli.

669
00:33:38,060 --> 00:33:42,500
Kwa sababu mimi nilimsahau kwamba zaidi ya
njia mbili tunaweza kutumia nyota alama,

670
00:33:42,500 --> 00:33:43,750
kuna kweli njia tatu.

671
00:33:43,750 --> 00:33:44,990
Kuzidisha.

672
00:33:44,990 --> 00:33:51,380
Na hivyo si tu kupata kuchanganyikiwa kwa sababu
kuwa ni njia ya kwanza ya kutumia nyota.

673
00:33:51,380 --> 00:33:54,470
Ni kuwaambia tu kompyuta
kwamba mimi nina kuhusu kujenga pointer.

674
00:33:54,470 --> 00:34:00,600
>> Njia ya pili kwa kufanya
nyota wa pointer yako,

675
00:34:00,600 --> 00:34:04,320
kwamba anaelezea pointer kwamba unataka
kupata data wakati huo pointer.

676
00:34:04,320 --> 00:34:06,710
Na kisha, bila shaka, kuna
kuzidisha rahisi tu

677
00:34:06,710 --> 00:34:09,564
kati ya namba mbili kwamba anasema
kuwa nataka kuzidisha mbili.

678
00:34:09,564 --> 00:34:11,730
Hivyo kuna mengi ya njia
tunaweza kutumia nyota alama.

679
00:34:11,730 --> 00:34:13,830
Je, si kupata kuchanganyikiwa.

680
00:34:13,830 --> 00:34:16,991
Tu kuhakikisha kwamba nyie kuelewa
nini hasa zote tatu wao

681
00:34:16,991 --> 00:34:18,630
unafanya.

682
00:34:18,630 --> 00:34:22,920
>> Hivyo katika mstari huu wa kwanza,
a sawa na mara b c.

683
00:34:22,920 --> 00:34:26,850
Basi hebu kwenda kwa njia ya kile
ni, ni nini b, ni nini c?

684
00:34:26,850 --> 00:34:32,600
Na ni nini pointer ya,
pointer b, na c pointer?

685
00:34:32,600 --> 00:34:34,050
Je, ni sawa na wale wote?

686
00:34:34,050 --> 00:34:34,600
SAWA.

687
00:34:34,600 --> 00:34:38,650
>> Hivyo sisi kuanza mbali na ni sawa na 3,
b sawa na 4, na c ni sawa na 5, sawa?

688
00:34:38,650 --> 00:34:42,230
Kwa hiyo baada ya kuwa mstari wa kwanza, unaweza
mtu kuniambia nini a ni?

689
00:34:42,230 --> 00:34:42,730
Naam.

690
00:34:42,730 --> 00:34:44,229
Kujisikia huru na haki kuita majibu.

691
00:34:44,229 --> 00:34:44,929
20.

692
00:34:44,929 --> 00:34:45,550
Nzuri.

693
00:34:45,550 --> 00:34:46,410
Nini b?

694
00:34:46,410 --> 00:34:47,777
>> Watazamaji: 4.

695
00:34:47,777 --> 00:34:48,610
ANDI PENG: Nini c?

696
00:34:48,610 --> 00:34:49,659
Watazamaji: 5.

697
00:34:49,659 --> 00:34:50,770
ANDI PENG: Yay.

698
00:34:50,770 --> 00:34:51,639
Nzuri.

699
00:34:51,639 --> 00:34:55,707
Je, ni pa, AS, na pc?

700
00:34:55,707 --> 00:34:58,564
>> Watazamaji: 000001 na 002?

701
00:34:58,564 --> 00:34:59,230
ANDI PENG: Naam.

702
00:34:59,230 --> 00:35:02,390
Hivyo aina ya swali hila
lakini si kweli kwa sababu mimi hapa

703
00:35:02,390 --> 00:35:04,760
akatoa kumbukumbu halisi.

704
00:35:04,760 --> 00:35:08,520
Lakini kwa sababu, kwa mfano, hatufanyi
kweli kujua nini wale idadi ni,

705
00:35:08,520 --> 00:35:10,326
tunaweza tu kusema ampersand.

706
00:35:10,326 --> 00:35:12,200
Mimi wala hata kujua kama mimi
wanaweza kuteka ampersand.

707
00:35:12,200 --> 00:35:18,022
Ni like-- ni jinsi gani unaweza kufanya hivyo?

708
00:35:18,022 --> 00:35:19,790
>> Watazamaji: Kama kuchora nane.

709
00:35:19,790 --> 00:35:20,870
>> ANDI PENG: Kama nane.

710
00:35:20,870 --> 00:35:21,580
Kama hiyo.

711
00:35:21,580 --> 00:35:22,080
SAWA.

712
00:35:22,080 --> 00:35:23,446
Watazamaji: Bingo.

713
00:35:23,446 --> 00:35:25,350
>> ANDI PENG: Mauaji hayo.

714
00:35:25,350 --> 00:35:28,202
Hivyo ampersand, unaweza tu kufanya hivyo.

715
00:35:28,202 --> 00:35:30,410
Kwa sababu sisi si kweli
huduma ya kile thamani ya kwamba

716
00:35:30,410 --> 00:35:32,880
ni, na ni baadhi ya muda mrefu
thamani punda anyways,

717
00:35:32,880 --> 00:35:35,220
sisi ni kutumia giông tu
kusema ampersand a.

718
00:35:35,220 --> 00:35:37,024
Kisha nini PB?

719
00:35:37,024 --> 00:35:37,940
Watazamaji: [inaudible].

720
00:35:37,940 --> 00:35:38,606
ANDI PENG: Naam.

721
00:35:38,606 --> 00:35:42,490

722
00:35:42,490 --> 00:35:43,500
Baridi.

723
00:35:43,500 --> 00:35:44,010
Sawa.

724
00:35:44,010 --> 00:35:44,770
Easy kwanza line.

725
00:35:44,770 --> 00:35:45,270
Tulipata hii.

726
00:35:45,270 --> 00:35:46,330
Kuyatumia ni rahisi.

727
00:35:46,330 --> 00:35:47,450
Ni sawa.

728
00:35:47,450 --> 00:35:48,740
>> Pili line.

729
00:35:48,740 --> 00:35:52,400
Na hivyo nyota ni sawa na ni sawa
Jambo akisema ni sawa na mara c.

730
00:35:52,400 --> 00:35:54,730
Ni tu njia rahisi ya kuandika.

731
00:35:54,730 --> 00:35:57,170
Hivyo sisi siyo kujaribu kufanya
hatua au kitu chochote hapa.

732
00:35:57,170 --> 00:36:00,600
Hivyo kufanywa na mstari wa kwanza.

733
00:36:00,600 --> 00:36:05,144
Ni nini juu ya mstari wa pili
baada ya kufanya sawa na mara c?

734
00:36:05,144 --> 00:36:05,777
>> Watazamaji: 100?

735
00:36:05,777 --> 00:36:06,610
ANDI PENG: Ni 100.

736
00:36:06,610 --> 00:36:07,795
Nzuri.

737
00:36:07,795 --> 00:36:08,864
Vipi kuhusu b?

738
00:36:08,864 --> 00:36:10,256
>> Watazamaji: [inaudible].

739
00:36:10,256 --> 00:36:11,335
>> ANDI PENG: Vipi kuhusu c?

740
00:36:11,335 --> 00:36:12,490
>> Watazamaji: [inaudible].

741
00:36:12,490 --> 00:36:14,530
>> ANDI PENG: Na vipi kuhusu kuyatumia?

742
00:36:14,530 --> 00:36:15,800
Je, they-- huo, sawa?

743
00:36:15,800 --> 00:36:20,640

744
00:36:20,640 --> 00:36:21,940
SAWA.

745
00:36:21,940 --> 00:36:23,820
Sasa mstari wa tatu.

746
00:36:23,820 --> 00:36:26,400

747
00:36:26,400 --> 00:36:27,350
Kidogo trickier.

748
00:36:27,350 --> 00:36:29,760
b sawa na nyota pa.

749
00:36:29,760 --> 00:36:34,189
Je, mtu kuniambia, kwanza,
nini nyota pa sawa?

750
00:36:34,189 --> 00:36:36,159
>> Watazamaji: Ni thamani
ambayo imehifadhiwa katika.

751
00:36:36,159 --> 00:36:36,950
ANDI PENG: Hasa.

752
00:36:36,950 --> 00:36:38,070
Na ni nini thamani
ambayo imehifadhiwa katika?

753
00:36:38,070 --> 00:36:38,860
>> Watazamaji: 100.

754
00:36:38,860 --> 00:36:39,660
>> ANDI PENG: Sawa.

755
00:36:39,660 --> 00:36:43,462
Hivyo nini itakuwa baada ya
utekelezaji kuwa mstari wa kanuni?

756
00:36:43,462 --> 00:36:44,760
>> Watazamaji: [inaudible].

757
00:36:44,760 --> 00:36:45,870
>> ANDI PENG: Je kuhusu b?

758
00:36:45,870 --> 00:36:46,780
>> Watazamaji: 100.

759
00:36:46,780 --> 00:36:47,620
>> ANDI PENG: Naam.

760
00:36:47,620 --> 00:36:49,995
Na kisha kila kitu kingine ni
pretty much unchanged, sawa?

761
00:36:49,995 --> 00:36:51,239
Kwa sababu hatukuwa kugusa yake.

762
00:36:51,239 --> 00:36:55,370

763
00:36:55,370 --> 00:36:57,010
Baridi.

764
00:36:57,010 --> 00:36:58,390
Mstari wa nne.

765
00:36:58,390 --> 00:37:00,390
Kidogo ngumu zaidi.

766
00:37:00,390 --> 00:37:06,910
Hivyo pc-- kwa mara nyingine tena, ni pointer pc
kwamba alisema kwa c-- sawa na pa.

767
00:37:06,910 --> 00:37:11,520

768
00:37:11,520 --> 00:37:12,360
Ni nini?

769
00:37:12,360 --> 00:37:14,525
>> Watazamaji: 100.

770
00:37:14,525 --> 00:37:15,400
ANDI PENG: ni b ni nini?

771
00:37:15,400 --> 00:37:17,920
Watazamaji: 100.

772
00:37:17,920 --> 00:37:18,862
ANDI PENG: c ni nini?

773
00:37:18,862 --> 00:37:19,993
Watazamaji: 5.

774
00:37:19,993 --> 00:37:20,867
ANDI PENG: Nini pa?

775
00:37:20,867 --> 00:37:22,775
Watazamaji: ampersand.

776
00:37:22,775 --> 00:37:23,730
ANDI PENG: PB?

777
00:37:23,730 --> 00:37:26,010
Watazamaji: Ampersand b.

778
00:37:26,010 --> 00:37:27,730
ANDI PENG: Na gumu, ni nini pc sasa?

779
00:37:27,730 --> 00:37:28,410
Watazamaji: ampersand.

780
00:37:28,410 --> 00:37:29,034
ANDI PENG: Yay.

781
00:37:29,034 --> 00:37:31,790
Woo hoo.

782
00:37:31,790 --> 00:37:32,500
Nyie kuona kitu gani?

783
00:37:32,500 --> 00:37:33,282
Hii ni sawa.

784
00:37:33,282 --> 00:37:33,990
Ni si mbaya sana.

785
00:37:33,990 --> 00:37:38,730
Tuna pipi zaidi kama siyo zote
haki, lakini nadhani ni sawa.

786
00:37:38,730 --> 00:37:41,900
Na tunakwenda kwenda juu moja tu
zaidi kabla ya sisi kugonga ndio ngumu.

787
00:37:41,900 --> 00:37:43,710
Majibu nina hapa.

788
00:37:43,710 --> 00:37:47,050
>> Kimsingi, kujua kwamba hii ni
kama hesabu katika hatua hii.

789
00:37:47,050 --> 00:37:53,240
Wakati una equations rahisi kama
pamoja na b, c mara, hiyo ni rahisi kufanya.

790
00:37:53,240 --> 00:37:56,390
Na wakati wa kuanza kupanua juu ya
hivyo, tu kwenda utaratibu wa shughuli.

791
00:37:56,390 --> 00:37:57,830
Kitu kimoja kama kabla.

792
00:37:57,830 --> 00:38:00,030
>> Kuweka wimbo wa kama yako
nyota ni kabla ya kitu fulani.

793
00:38:00,030 --> 00:38:01,640
Kwamba anaelezea thamani.

794
00:38:01,640 --> 00:38:04,640
Kama una na kabla
kitu, atakwambia mahali.

795
00:38:04,640 --> 00:38:07,860
Na unapaswa kuwapa ama
kuyatumia au thamani hiyo.

796
00:38:07,860 --> 00:38:11,260
Basi hebu kwenda juu ya hii
mwisho moja ya haraka ya kweli.

797
00:38:11,260 --> 00:38:12,520
Si hii moja ya mwisho, pole.

798
00:38:12,520 --> 00:38:13,340
Kwa kweli, nyie anaweza kuchukua.

799
00:38:13,340 --> 00:38:16,006
Ambayo moja je, guys wanataka kwenda
zaidi nje ya tatu iliyobaki

800
00:38:16,006 --> 00:38:17,449
kwamba tuna?

801
00:38:17,449 --> 00:38:20,490
Sidhani kama tunaweza tu kufanya hivyo
kwa sababu hatuwezi tu kuruka kwa mstari.

802
00:38:20,490 --> 00:38:21,000
SAWA.

803
00:38:21,000 --> 00:38:25,700
Nyie hawana uchaguzi,
ni tu ya tatu kwa mara ya mwisho moja.

804
00:38:25,700 --> 00:38:29,228
>> Star pc sawa na mara b c.

805
00:38:29,228 --> 00:38:30,144
>> Watazamaji: Star PB?

806
00:38:30,144 --> 00:38:32,117
>> Watazamaji: Star PB.

807
00:38:32,117 --> 00:38:32,825
ANDI PENG: Sorry?

808
00:38:32,825 --> 00:38:33,599
Watazamaji: Star PB.

809
00:38:33,599 --> 00:38:34,390
ANDI PENG: Star PB.

810
00:38:34,390 --> 00:38:35,100
Oh, mbaya wangu.

811
00:38:35,100 --> 00:38:38,647
Star PB sawa na mara b c.

812
00:38:38,647 --> 00:38:40,230
Mimi nina kwenda kukupa guys sekunde 10.

813
00:38:40,230 --> 00:38:41,140
Haraka tu kufikiri.

814
00:38:41,140 --> 00:38:43,450
Hii ni kwamba tuna hivyo
mbali, nini kinatokea baada ya sisi

815
00:38:43,450 --> 00:38:46,770
kutekeleza kwamba mstari wa tano pale pale?

816
00:38:46,770 --> 00:38:54,030

817
00:38:54,030 --> 00:38:55,980
SAWA.

818
00:38:55,980 --> 00:38:58,720
Ni nini?

819
00:38:58,720 --> 00:38:59,560
>> Watazamaji: 100.

820
00:38:59,560 --> 00:39:02,470
>> ANDI PENG: 100.

821
00:39:02,470 --> 00:39:03,610
Ni nini b sasa?

822
00:39:03,610 --> 00:39:04,330
>> Watazamaji: 500.

823
00:39:04,330 --> 00:39:05,250
>> ANDI PENG: Good.

824
00:39:05,250 --> 00:39:08,570
Je, mtu unataka kueleza
kwangu kwa nini hii ni 500?

825
00:39:08,570 --> 00:39:10,540
Sijisikii kama sisi
kweli milele kuguswa b.

826
00:39:10,540 --> 00:39:13,950
Jinsi gani sisi kusimamia na mabadiliko
thamani ya b bila kugusa b?

827
00:39:13,950 --> 00:39:15,090
Yeah?

828
00:39:15,090 --> 00:39:18,239
>> Watazamaji: Kwa sababu nyota PB
ina maana thamani kwenye pb--

829
00:39:18,239 --> 00:39:19,030
ANDI PENG: Hasa.

830
00:39:19,030 --> 00:39:19,790
Watazamaji: --which ni b.

831
00:39:19,790 --> 00:39:20,581
ANDI PENG: Hasa.

832
00:39:20,581 --> 00:39:26,880
Hivyo hapa katika mchoro wetu, pointer yetu
PB ni kweli akizungumzia haki hii

833
00:39:26,880 --> 00:39:28,690
hapa, ambayo ni halisi ya kimwili b.

834
00:39:28,690 --> 00:39:31,340
Na hivyo kama wewe kwenda na
kufanya nyota AS, hiyo ni

835
00:39:31,340 --> 00:39:36,080
kufuatia mshale yako ya pointer yako
na kimwili kubadilisha thamani ya b.

836
00:39:36,080 --> 00:39:39,532
Hivyo ndiyo sababu tuna b iliyopita na
500 bila kweli kugusa b.

837
00:39:39,532 --> 00:39:42,490
Na kisha kila kitu kingine bado
sawa kwa sababu hatukuwa kugusa hiyo.

838
00:39:42,490 --> 00:39:47,060

839
00:39:47,060 --> 00:39:48,530
Hiyo ni b.

840
00:39:48,530 --> 00:39:49,420
Baridi.

841
00:39:49,420 --> 00:39:50,485
Na then--

842
00:39:50,485 --> 00:39:51,910
>> Watazamaji: Mimi tu swali.

843
00:39:51,910 --> 00:39:52,730
>> ANDI PENG: Yeah?

844
00:39:52,730 --> 00:39:56,000
>> Watazamaji: Kwa kuwa we've--
hakuna tena ampersand c,

845
00:39:56,000 --> 00:39:59,620
Hiyo ina maana ampersand a
kuelekeza kwa kitu kimoja sasa?

846
00:39:59,620 --> 00:40:00,520
>> ANDI PENG: Yep.

847
00:40:00,520 --> 00:40:01,582
So--

848
00:40:01,582 --> 00:40:03,540
Watazamaji: Hivyo mshale
aina ya tu hatua and--

849
00:40:03,540 --> 00:40:04,030
ANDI PENG: Kwa hiyo essentially--

850
00:40:04,030 --> 00:40:05,405
Watazamaji: --now hatuwezi access--

851
00:40:05,405 --> 00:40:08,387
ANDI PENG: --when sisi
dereference c on-- mimi mzushi.

852
00:40:08,387 --> 00:40:08,970
Nini ilikuwa hivyo?

853
00:40:08,970 --> 00:40:09,560
Mstari wa tatu?

854
00:40:09,560 --> 00:40:10,060
Nne.

855
00:40:10,060 --> 00:40:11,490
Mstari wa nne.

856
00:40:11,490 --> 00:40:14,910
Wote sisi alifanya alikuwa, kimsingi,
mabadiliko mshale huu

857
00:40:14,910 --> 00:40:16,680
na kuwa ni muelekeo wa badala.

858
00:40:16,680 --> 00:40:19,480
>> Watazamaji: Hivyo sisi hawawezi kupata c tena.

859
00:40:19,480 --> 00:40:22,520
>> ANDI PENG: Kama ulikuwa hii halisi
idadi, unaweza kupata huduma hiyo.

860
00:40:22,520 --> 00:40:23,260
Lakini, hakuna.

861
00:40:23,260 --> 00:40:25,680
Hatuna pointer
akizungumzia kuelekea c tena.

862
00:40:25,680 --> 00:40:27,430
Nadhani kama alitaka
upya upatikanaji hilo,

863
00:40:27,430 --> 00:40:30,390
ingekuwa kujenga mwingine
pointer kwamba re-alisema kwa c

864
00:40:30,390 --> 00:40:32,856
au dereferenced hii na alisema nyuma.

865
00:40:32,856 --> 00:40:35,730
Hivyo, hakuna, kama ya sasa hivi, tatu
kuyatumia, hakuna hata mmoja wao uhakika na c.

866
00:40:35,730 --> 00:40:38,800

867
00:40:38,800 --> 00:40:40,110
>> Kila mtu mwema?

868
00:40:40,110 --> 00:40:41,440
Majibu ni online.

869
00:40:41,440 --> 00:40:45,210
Kujisikia huru, baada ya kifungu cha, kwenda juu
mbili na mtihani wa mwisho wenyewe.

870
00:40:45,210 --> 00:40:47,840
Dhana hiyo, tu
kidogo trickier kidogo.

871
00:40:47,840 --> 00:40:51,860
Kufuata tu kwa njia ya mantiki ya
kwa nini mambo ni mambo mbalimbali.

872
00:40:51,860 --> 00:40:54,530
Na ladha, kuyatumia ni
mada kwamba tunapenda

873
00:40:54,530 --> 00:40:58,780
kufunika juu ya Quizzes kwa sababu wao ni
conceptually sana changamoto.

874
00:40:58,780 --> 00:41:01,360
Hivyo napenda kupendekeza kwamba wewe
guys wote kupitia mchoro huu

875
00:41:01,360 --> 00:41:05,916
au kufyeka dhana sawa na
hii kabla ya jaribio yako wiki ijayo.

876
00:41:05,916 --> 00:41:06,864
>> Watazamaji: Samahani.

877
00:41:06,864 --> 00:41:07,530
>> ANDI PENG: Yeah?

878
00:41:07,530 --> 00:41:09,708
Watazamaji: [inaudible]
mwisho one-- [inaudible].

879
00:41:09,708 --> 00:41:12,710

880
00:41:12,710 --> 00:41:15,770
>> ANDI PENG: 50,000?

881
00:41:15,770 --> 00:41:17,850
Napenda haja ya kufuata nyuma chini.

882
00:41:17,850 --> 00:41:22,530
Lakini somewhere-- Nadhani mstari
kabla, wewe uliumba thamani kubwa c.

883
00:41:22,530 --> 00:41:26,250
c sawa na jambo hili kubwa
ambayo ni 100 mara 500.

884
00:41:26,250 --> 00:41:27,006
Hakuna

885
00:41:27,006 --> 00:41:28,000
>> Watazamaji: [inaudible].

886
00:41:28,000 --> 00:41:28,625
>> ANDI PENG: Ndiyo.

887
00:41:28,625 --> 00:41:30,620
100 mara 100 ambayo ni 10,000.

888
00:41:30,620 --> 00:41:32,020
Ambayo ni 10,000.

889
00:41:32,020 --> 00:41:35,410
Hivyo nyuma chini huko uko
kuzidisha b na c.

890
00:41:35,410 --> 00:41:43,165
Hivyo pointer kwamba pointi kwa b--
ambayo ni thamani ya mara 500-- a--

891
00:41:43,165 --> 00:41:44,480
>> Watazamaji: [inaudible].

892
00:41:44,480 --> 00:41:45,730
ANDI PENG: Labda hilo ni kosa.

893
00:41:45,730 --> 00:41:49,514
Watazamaji: Hapana, hapana, siyo. [Inaudible]
pointer katika c sasa akionyesha a--

894
00:41:49,514 --> 00:41:50,180
ANDI PENG: Naam.

895
00:41:50,180 --> 00:41:50,840
Yeye ni haki.

896
00:41:50,840 --> 00:41:56,477
>> Watazamaji: --it ni katika wake katika usawa
a times-- ni thamani ya c.

897
00:41:56,477 --> 00:41:59,560
ANDI PENG: Je, unaweza kusema kwamba kidogo
kidogo nguvu zaidi ili kila mtu anaweza kusikia wewe?

898
00:41:59,560 --> 00:42:04,879
Watazamaji: Hivyo pointer katika c sasa anasema
kwa nini pointer kwa uhakika wa kutumika

899
00:42:04,879 --> 00:42:09,460
to-- na bado does-- lakini wao uhakika na
kitu kimoja ambayo ni a, sawa?

900
00:42:09,460 --> 00:42:12,925
Thamani a, hata hivyo
imekuwa ni wapya inavyoelezwa.

901
00:42:12,925 --> 00:42:17,875
Na mwanzoni mwa kwamba wewe ni
akisema awali alikuwa mara 100

902
00:42:17,875 --> 00:42:21,340
thamani katika b ambayo ni 500.

903
00:42:21,340 --> 00:42:24,305
Na hivyo ndiyo hata hivyo, kwamba ni.

904
00:42:24,305 --> 00:42:24,805
50,000.

905
00:42:24,805 --> 00:42:32,860
Wao uko reassigning kwamba kwa nini
kumbukumbu nafasi katika c is-- pointer katika c

906
00:42:32,860 --> 00:42:34,510
ni akizungumzia ambayo ni.

907
00:42:34,510 --> 00:42:38,460
Hivyo wewe ni upya na kuwa 50,000.

908
00:42:38,460 --> 00:42:40,210
ANDI PENG: Yeye anaweza
kufundisha kifungu kwa ajili yangu.

909
00:42:40,210 --> 00:42:41,260
Wakati mwingine ni yako yote.

910
00:42:41,260 --> 00:42:41,440
Hapa.

911
00:42:41,440 --> 00:42:42,564
Hapa ni pipi zaidi kwa ajili hiyo.

912
00:42:42,564 --> 00:42:45,790
Unastahili pipi kwa ajili hiyo.

913
00:42:45,790 --> 00:42:47,260
>> Watazamaji: Mimi karibu hawakupata hiyo.

914
00:42:47,260 --> 00:42:47,660
>> ANDI PENG: Wewe karibu hawakupata hiyo.

915
00:42:47,660 --> 00:42:48,450
Hiyo ni sawa.

916
00:42:48,450 --> 00:42:48,950
Naam.

917
00:42:48,950 --> 00:42:50,033
Lakini yeye alikuwa sahihi kabisa.

918
00:42:50,033 --> 00:42:54,469
Kwa hiyo kile una kufanya
ni that-- Nadhani sisi

919
00:42:54,469 --> 00:42:56,510
una kufuata ukweli
kwamba kuyatumia ni sasa

920
00:42:56,510 --> 00:42:57,880
akizungumzia maadili tofauti.

921
00:42:57,880 --> 00:43:01,785
Hivyo value-- pole,
pointer ya c repointed kwa.

922
00:43:01,785 --> 00:43:04,390
Na hivyo kuwa kubadilishwa yote ya idadi yetu.

923
00:43:04,390 --> 00:43:08,930
Na hii ndiyo maana, wakati wewe kupata
thamani kuhifadhiwa huko, ni tofauti.

924
00:43:08,930 --> 00:43:10,490
Je, hiyo mantiki?

925
00:43:10,490 --> 00:43:11,380
SAWA.

926
00:43:11,380 --> 00:43:12,820
Baridi.

927
00:43:12,820 --> 00:43:16,635
Kila mtu mwema, kabla ya mimi kuondoka?

928
00:43:16,635 --> 00:43:25,332
>> Watazamaji: Je, the-- wakati wewe ni kwenda
chini ya safu katika safu ya kushoto,

929
00:43:25,332 --> 00:43:30,494
haina safu ya kwanza kuathiri safu ya pili
na kisha second-- kama, ni all--

930
00:43:30,494 --> 00:43:31,160
ANDI PENG: Naam.

931
00:43:31,160 --> 00:43:37,610
Hivyo kufikiria ni kanuni ambapo mimi tu typed
katika sawa b nyakati c, nyota ni sawa na c.

932
00:43:37,610 --> 00:43:40,290
Hebu fikiria kwamba nimekuwa
tu mbio kificho hii

933
00:43:40,290 --> 00:43:42,710
na sikuweza magazeti nje nini
mambo yote haya walikuwa.

934
00:43:42,710 --> 00:43:46,200
Kama ningekuwa tu magazeti kwanza
Jambo juu, itakuwa hapa.

935
00:43:46,200 --> 00:43:48,510
Kama baada ya mimi mbio zote za
wale mistari ya kificho,

936
00:43:48,510 --> 00:43:51,160
nini maadili haya lazima
kuwa mwishoni ni kwamba.

937
00:43:51,160 --> 00:43:53,290
>> Hivyo nimekuwa kweli imeandikwa mpango hapa.

938
00:43:53,290 --> 00:43:55,840
Mimi sina kosa yote ya
kuzidisha.

939
00:43:55,840 --> 00:43:58,310
Lakini tu kufikiria.

940
00:43:58,310 --> 00:44:00,370
Hivyo hapa mimi tu na
mpango ujulikanao kuyatumia.

941
00:44:00,370 --> 00:44:04,190
Mimi nina kwenda kuvuta kama wewe guys-- sawa.

942
00:44:04,190 --> 00:44:07,580
Hivyo nimekuwa kuundwa vigezo, b, na c.

943
00:44:07,580 --> 00:44:09,640
Nimekuwa kuweka yao sawa na
3, 4, na 5 na nimekuwa

944
00:44:09,640 --> 00:44:11,770
umba kuyatumia yao sambamba.

945
00:44:11,770 --> 00:44:14,550
Na kisha hapa mimi nina kwenda tu
magazeti nje nini kwamba ni.

946
00:44:14,550 --> 00:44:15,833
Hivyo basi mimi kukimbia huo.

947
00:44:15,833 --> 00:44:21,520

948
00:44:21,520 --> 00:44:24,750
>> Je, guys see-- crap.

949
00:44:24,750 --> 00:44:28,150
Je, guys kuona jinsi,
b na c ni maadili hayo

950
00:44:28,150 --> 00:44:33,530
lakini kuyatumia yao ni kubwa hii
takataka thamani kwamba hatuna huduma ya juu?

951
00:44:33,530 --> 00:44:36,690
Hivyo kama ningekuwa kweli kuziba
katika kuzidisha zote

952
00:44:36,690 --> 00:44:39,770
na kisha kikachapishwa wote wa
huu, ingekuwa kutekeleza nje

953
00:44:39,770 --> 00:44:44,509
kwa nini kuwa ni chini.

954
00:44:44,509 --> 00:44:47,300
Hivyo kama wewe guys wanataka kucheza karibu
kwa kweli kimwili coding,

955
00:44:47,300 --> 00:44:49,000
nyie unaweza kuziba tu wale wote katika.

956
00:44:49,000 --> 00:44:52,860
Kificho itakuwa online na kisha yako
maadili lazima magazeti kwa kuwa baadaye.

957
00:44:52,860 --> 00:44:56,170
>> Na kisha utaona jinsi pointer
anwani kwa kweli reassigned.

958
00:44:56,170 --> 00:44:59,190
Hivyo utaona jinsi
pepe ya c kweli inakuwa

959
00:44:59,190 --> 00:45:00,920
kwa sawa chochote pepe ya mara.

960
00:45:00,920 --> 00:45:04,140
Na wao itabidi mechi chochote
idadi hiyo kubwa ni.

961
00:45:04,140 --> 00:45:06,530
Nzuri swali.

962
00:45:06,530 --> 00:45:07,550
Kila mtu sawa?

963
00:45:07,550 --> 00:45:10,300
Moja wito wa mwisho kwa maswali.

964
00:45:10,300 --> 00:45:11,590
SAWA.

965
00:45:11,590 --> 00:45:12,090
Sawa.

966
00:45:12,090 --> 00:45:15,940
Ili kujiandaa kuwa na akili yako
barugumu kidogo kidogo zaidi.

967
00:45:15,940 --> 00:45:18,000
Arrays ni kweli kuyatumia tu.

968
00:45:18,000 --> 00:45:19,010
Hayo ni yote walipo.

969
00:45:19,010 --> 00:45:20,410
Na kumbuka, ni masharti?

970
00:45:20,410 --> 00:45:21,630
Wao ni pia arrays.

971
00:45:21,630 --> 00:45:23,110
Kwa hiyo kile ni masharti kweli?

972
00:45:23,110 --> 00:45:27,100
Wao ni kama kuyatumia kwa
mwanzo wa char ya chars zaidi.

973
00:45:27,100 --> 00:45:29,970
>> Hivyo ni dhana tu kwamba kuanza
kujenga juu ya kila mmoja.

974
00:45:29,970 --> 00:45:32,030
Hivyo hiyo ni why-- wewe
kumbuka katika hotuba, Daudi,

975
00:45:32,030 --> 00:45:34,990
wakati yeye alikuwa na kwamba kulinganisha
ya int kamba mama

976
00:45:34,990 --> 00:45:37,640
ni kitu na kisha
mwingine kamba mama na wewe

977
00:45:37,640 --> 00:45:41,240
kujaribu equate mbili kwa kila mmoja,
wao kukupa maadili tofauti.

978
00:45:41,240 --> 00:45:44,370
Ni kwa sababu masharti
wenyewe si maadili.

979
00:45:44,370 --> 00:45:48,860
Wote hao ni watu anwani kumbukumbu char--
wao ni arrays ya chars na arrays

980
00:45:48,860 --> 00:45:50,050
ni kuyatumia tu.

981
00:45:50,050 --> 00:45:54,022
>> Hivyo, kwa asili, wakati
Daudi alikuwa comparing--

982
00:45:54,022 --> 00:45:55,355
je, ni sawa kama mimi kufuta yote haya?

983
00:45:55,355 --> 00:46:02,320

984
00:46:02,320 --> 00:46:09,750
Hivyo katika hotuba wakati Daudi
alikuwa mama sawa sawa na mama,

985
00:46:09,750 --> 00:46:11,630
kwetu kwamba inaonekana kuwa kitu kimoja.

986
00:46:11,630 --> 00:46:12,317
Sawa?

987
00:46:12,317 --> 00:46:15,150
Lakini, katika kompyuta chini
kofia, nini ni kweli yanatokea

988
00:46:15,150 --> 00:46:18,380
ni kwamba kamba hii,
yote ambayo ni safu.

989
00:46:18,380 --> 00:46:21,420

990
00:46:21,420 --> 00:46:25,390
Kwa ampersand-- au, pole,
pamoja null Terminator mwishoni.

991
00:46:25,390 --> 00:46:28,311

992
00:46:28,311 --> 00:46:28,810
Sawa?

993
00:46:28,810 --> 00:46:29,940
Backslash 0.

994
00:46:29,940 --> 00:46:32,900
Vibaya backslash.

995
00:46:32,900 --> 00:46:35,960
>> Basi wote hao were-- zote
masharti hayo mawili were--

996
00:46:35,960 --> 00:46:40,360
ni safu ya ukubwa fours kwa
barua ya mama na mama.

997
00:46:40,360 --> 00:46:44,780
Lakini nini arrays kwa kweli ni watu tu
kuyatumia kwa mahali maalum katika kumbukumbu

998
00:46:44,780 --> 00:46:47,140
kwamba anaelezea kuanza safu yako.

999
00:46:47,140 --> 00:46:52,370
Hivyo katika kesi hii, yote hii ilikuwa
Ilikuwa baadhi tu ya thamani ya takataka,

1000
00:46:52,370 --> 00:46:54,230
baadhi pointer bila mpangilio.

1001
00:46:54,230 --> 00:46:56,330
Na yote hii ilikuwa ilikuwa
baadhi ya wengine takataka thamani.

1002
00:46:56,330 --> 00:46:59,830
Hebu tu kusema 0x200.

1003
00:46:59,830 --> 00:47:02,410
>> Na hivyo wakati wewe kujaribu sawa
nao wawili kwa kila mmoja,

1004
00:47:02,410 --> 00:47:06,130
wao kutathmini kwa uongo kwa sababu
addresses-- kuyatumia

1005
00:47:06,130 --> 00:47:08,390
kuwa wao were-- yalikuwa tofauti.

1006
00:47:08,390 --> 00:47:11,400
Wakati ni tofauti kama wewe ni
kujaribu kulinganisha integers halisi.

1007
00:47:11,400 --> 00:47:15,820
Kama kama alitaka compare--
katika mwisho example-- int a b,

1008
00:47:15,820 --> 00:47:17,640
wangeweza kutathmini
kwa kweli kama Elliot alisema

1009
00:47:17,640 --> 00:47:19,431
kwa sababu walikuwa
integers kwamba walikuwa kuhifadhiwa

1010
00:47:19,431 --> 00:47:21,320
na wewe ni kutathmini tu maadili.

1011
00:47:21,320 --> 00:47:25,090
Hapa, kwa sababu masharti ni arrays
na arrays wote ni kuyatumia,

1012
00:47:25,090 --> 00:47:28,080
hiyo ndiyo sababu wao si
sawa kwa kila mmoja.

1013
00:47:28,080 --> 00:47:31,210
>> Hivyo aina ya utata, kwamba graphic.

1014
00:47:31,210 --> 00:47:32,450
Lakini hebu tu kufikiria.

1015
00:47:32,450 --> 00:47:38,110
Tumekuwa kujenga safu ya ukubwa
3 na ripoti kutoka 0 kwa 2-- 0,

1016
00:47:38,110 --> 00:47:41,530
1, 2 na maadili ya 1,
2, na 3 kuhifadhiwa katika wao.

1017
00:47:41,530 --> 00:47:43,820
Safu zote kweli
does-- hapa, hebu tu

1018
00:47:43,820 --> 00:47:46,720
kusema mimi nina kujenga pointer
kwa kuwa safu hiyo ni

1019
00:47:46,720 --> 00:47:50,810
kupata thamani katika
kwanza ripoti ya safu hii.

1020
00:47:50,810 --> 00:47:52,890
Hivyo hapa itakuwa 0.

1021
00:47:52,890 --> 00:47:53,390
Sawa?

1022
00:47:53,390 --> 00:47:56,820
Je, kila mtu kuelewa jinsi
kuwa mstari wa kwanza tathmini?

1023
00:47:56,820 --> 00:47:57,420
Kubwa.

1024
00:47:57,420 --> 00:48:00,800
>> Na hivyo kama alitaka initialize
maadili ziada baada ya hapo,

1025
00:48:00,800 --> 00:48:04,390
wote sisi ni kufanya ni reassigning.

1026
00:48:04,390 --> 00:48:08,810
Hivyo 0, 1, 2, 1.

1027
00:48:08,810 --> 00:48:12,770
Hivyo pointer hii kwamba mara kwa mara
akizungumzia hapa, kila tuko kufanya

1028
00:48:12,770 --> 00:48:15,540
ni kusonga chini.

1029
00:48:15,540 --> 00:48:16,970
Hilo ndilo pamoja na 1 ni kufanya.

1030
00:48:16,970 --> 00:48:18,500
Na kisha tunaweza kuweka 2 huko.

1031
00:48:18,500 --> 00:48:23,250
Kama sisi alitaka kuweka 3 katika moja
baada, tunataka kufuta pointer hii,

1032
00:48:23,250 --> 00:48:25,170
kuweka 3 katika huko.

1033
00:48:25,170 --> 00:48:26,420
Je, hiyo mantiki kila mtu?

1034
00:48:26,420 --> 00:48:26,920
Naam.

1035
00:48:26,920 --> 00:48:28,086
Je, una swali?

1036
00:48:28,086 --> 00:48:30,711
Watazamaji: Ni [inaudible] na
swali, mimi itabidi kusema hivyo.

1037
00:48:30,711 --> 00:48:35,496
Sidhani kama ni kweli
swali but-- kwa Kiingereza, safu

1038
00:48:35,496 --> 00:48:37,448
sawa na 1 hufanya akili.

1039
00:48:37,448 --> 00:48:39,888
Sisi ni kama, sawa, kitu cha kwanza.

1040
00:48:39,888 --> 00:48:44,280
Lakini mambo 0 ripoti
[Inaudible] safu sawa na 0

1041
00:48:44,280 --> 00:48:48,024
zinaonyesha doa kwanza.

1042
00:48:48,024 --> 00:48:48,690
ANDI PENG: Naam.

1043
00:48:48,690 --> 00:48:53,740
Hivyo kweli nini mimi kufanya hapa ni
Mimi si kupata ripoti ya kwanza.

1044
00:48:53,740 --> 00:48:57,930
Wote nilikuwa doing-- hivyo kwanza ya yote,
kuniambia nini nyota safu nini?

1045
00:48:57,930 --> 00:48:59,480
Je nyota kabla pointer nini?

1046
00:48:59,480 --> 00:49:00,855
>> Watazamaji: Inaonyesha pointer.

1047
00:49:00,855 --> 00:49:02,910
Kuwa wewe ni kutangaza pointer.

1048
00:49:02,910 --> 00:49:04,380
Ni de--

1049
00:49:04,380 --> 00:49:07,520
>> ANDI PENG: Ni dereferences ambayo ina maana
unaendelea na kwa kweli anapata thamani.

1050
00:49:07,520 --> 00:49:08,020
Sawa?

1051
00:49:08,020 --> 00:49:13,030
Hivyo katika kesi hii, unataka kupata
thamani hapa na kuweka kwamba kwa 1.

1052
00:49:13,030 --> 00:49:13,800
Yeah?

1053
00:49:13,800 --> 00:49:17,050
Hivyo mimi nina si actually-- mimi si
kweli huduma kuhusu ripoti hii,

1054
00:49:17,050 --> 00:49:21,406
zote mimi nina kufanya ni iterating chini tu
na kusonga pointer yangu chini safu.

1055
00:49:21,406 --> 00:49:23,280
Na kisha hatimaye mimi
kuwa na kuacha hayo, haki?

1056
00:49:23,280 --> 00:49:26,750
Na kwa njia hiyo mimi kuacha
ni wakati mimi kugonga, katika kesi

1057
00:49:26,750 --> 00:49:28,750
ya kamba, null Terminator.

1058
00:49:28,750 --> 00:49:32,710
Najua, loo, kama mimi hit back-- kama mimi kuona
backslash 0, najua mimi nina kufanyika kwa hii

1059
00:49:32,710 --> 00:49:35,270
na najua kwamba siwezi tu
kuacha iterating kupitia.

1060
00:49:35,270 --> 00:49:36,200
Mzuri swali.

1061
00:49:36,200 --> 00:49:40,210
>> Na tutaweza kweli kwenda mbali zaidi
kwa kina katika wiki hii ijayo

1062
00:49:40,210 --> 00:49:43,990
kwa sababu kipande ambayo inaenda
kuhusisha mengi ya matumizi ya kuyatumia.

1063
00:49:43,990 --> 00:49:48,459
Lakini tu kujua kwamba hivi sasa,
hiyo ni more-- tofauti

1064
00:49:48,459 --> 00:49:51,250
hiyo ni njia tofauti kwa
kompyuta kuandika, kimsingi,

1065
00:49:51,250 --> 00:49:52,470
nini tumekuwa kufanya.

1066
00:49:52,470 --> 00:49:54,900
Kama Daudi alisema katika
hotuba, kwa njia hiyo sisi

1067
00:49:54,900 --> 00:50:01,720
kupata safu ni tu kwa kufanya
safu 0, mabano 0, kama sisi tu

1068
00:50:01,720 --> 00:50:04,050
alitaka kupata thamani kwanza.

1069
00:50:04,050 --> 00:50:10,280
>> Kompyuta zote ni kufanya ni kugeuka
kwamba katika kuwa na iterating yenyewe.

1070
00:50:10,280 --> 00:50:13,580
Hivyo sisi kuiita kisintaksia
sukari ambayo ni haki

1071
00:50:13,580 --> 00:50:18,420
njia dhana ya kusema user kirafiki
njia ya sisi kujua jinsi ya mpango.

1072
00:50:18,420 --> 00:50:21,560
Lakini kompyuta
chini, nini ni kufanya,

1073
00:50:21,560 --> 00:50:23,997
ni kweli kuwa tu
pointer hiyo kurekebisha.

1074
00:50:23,997 --> 00:50:26,330
Lakini njia hiyo sisi kuandika,
kwa sababu ni rahisi kwa sisi

1075
00:50:26,330 --> 00:50:30,240
kufikiri juu ya mambo katika suala la
masanduku na jinsi ya kusonga chini masanduku,

1076
00:50:30,240 --> 00:50:32,190
ni kwa kuwa na mabano.

1077
00:50:32,190 --> 00:50:36,394
Samahani, kwamba alikuwa kweli,
kweli hafifu but-- yeah.

1078
00:50:36,394 --> 00:50:38,310
Watazamaji: Hivyo ni jinsi gani
kulinganisha masharti mawili

1079
00:50:38,310 --> 00:50:40,560
kuona kama uko sawa kwa kila mmoja?

1080
00:50:40,560 --> 00:50:42,690
>> ANDI PENG: Kwa hiyo Daudi aliandika
mpango huu katika hotuba

1081
00:50:42,690 --> 00:50:45,274
hivyo mimi nina kwenda tu kwenda
zaidi ya haraka na kwa ufupi.

1082
00:50:45,274 --> 00:50:47,440
Namna gani kufanya hivyo
ni kwamba wewe ungekuwa kweli

1083
00:50:47,440 --> 00:50:51,300
haja ya kwenda na kulinganisha
addresses-- au maadili

1084
00:50:51,300 --> 00:50:52,810
zilizopatikana kutoka kuyatumia.

1085
00:50:52,810 --> 00:50:55,140
Basi kumbuka, jinsi gani unaweza
kupata thamani hapa?

1086
00:50:55,140 --> 00:50:56,825
Sijali kuhusu anuani hapa.

1087
00:50:56,825 --> 00:50:58,950
Je, mimi kwa kweli kupata
thamani ya chochote hapa?

1088
00:50:58,950 --> 00:50:59,470
>> Watazamaji: [inaudible].

1089
00:50:59,470 --> 00:51:00,261
>> ANDI PENG: Hasa.

1090
00:51:00,261 --> 00:51:05,090
Hivyo kulinganisha nyota
hapa dhidi ya nyota hapa.

1091
00:51:05,090 --> 00:51:06,150
Ni wale sawa.

1092
00:51:06,150 --> 00:51:07,690
Na kisha kwenda chini.

1093
00:51:07,690 --> 00:51:09,530
Ni nyota hapa na
nyota hapa sawa?

1094
00:51:09,530 --> 00:51:10,030
SAWA.

1095
00:51:10,030 --> 00:51:10,283
Wao ni sawa.

1096
00:51:10,283 --> 00:51:12,866
Na wewe tu kuendelea kwenda chini
mpaka umefanya kugonga mwisho wa wote.

1097
00:51:12,866 --> 00:51:16,190
Na kama wote ni sawa, basi
unajua kamba yako ni sawa.

1098
00:51:16,190 --> 00:51:18,130
Na C kwa kweli ina
kazi kuandikwa inaitwa

1099
00:51:18,130 --> 00:51:20,713
Kamba Comp ambayo kwa kweli tu
anafanya hivyo kwa ajili yenu hivyo huna '

1100
00:51:20,713 --> 00:51:22,140
kuandika hivyo mwenyewe.

1101
00:51:22,140 --> 00:51:23,274
Yeah?

1102
00:51:23,274 --> 00:51:26,970
>> Watazamaji: Nadhani katika hotuba
ni wakati hatuna kulinganisha.

1103
00:51:26,970 --> 00:51:29,520
Sisi si kweli haja
kukabiliana na kama pi, sawa?

1104
00:51:29,520 --> 00:51:34,310
>> ANDI PENG: Je, si
kwa sababu sisi si kweli huduma

1105
00:51:34,310 --> 00:51:36,250
jinsi masanduku mengi tumekuwa iterated kupitia.

1106
00:51:36,250 --> 00:51:39,580
Wote sisi huduma ni kwamba tunakwenda
kuendelea mpaka Najua kuacha.

1107
00:51:39,580 --> 00:51:41,990
Na unajua kuacha wakati
kuna aina fulani ya dalili

1108
00:51:41,990 --> 00:51:45,310
kuwa uko katika null Terminator.

1109
00:51:45,310 --> 00:51:45,930
Naam.

1110
00:51:45,930 --> 00:51:47,154
So--

1111
00:51:47,154 --> 00:51:48,070
Watazamaji: [inaudible].

1112
00:51:48,070 --> 00:51:48,736
ANDI PENG: Naam.

1113
00:51:48,736 --> 00:51:51,950
Hivyo katika kesi ya kulinganisha
masharti, mimi si kweli

1114
00:51:51,950 --> 00:51:54,207
huduma barua ni wangapi
are-- nahitaji kulinganisha

1115
00:51:54,207 --> 00:51:56,540
kama uko kweli au uongo iwapo
wao uko sawa kwa kila mmoja.

1116
00:51:56,540 --> 00:51:58,914
Sijali barua ni wangapi
ni katika kila mmoja wao, sawa?

1117
00:51:58,914 --> 00:52:01,130
I just huduma ya kwamba hii
mechi na hii na moja

1118
00:52:01,130 --> 00:52:05,311
baada ya mechi na moja baada ya
mechi njia yote hadi mwisho.

1119
00:52:05,311 --> 00:52:05,810
Sawa?

1120
00:52:05,810 --> 00:52:07,000
Je, hiyo mantiki?

1121
00:52:07,000 --> 00:52:10,166
>> Hivyo mimi si kweli huduma barua ni wangapi,
I just huduma ya kwamba wote wa barua

1122
00:52:10,166 --> 00:52:11,050
mechi.

1123
00:52:11,050 --> 00:52:12,910
Naam.

1124
00:52:12,910 --> 00:52:13,920
SAWA.

1125
00:52:13,920 --> 00:52:16,840
Je, mimi hoja juu ya kutokana na hili?

1126
00:52:16,840 --> 00:52:18,489
Kubwa.

1127
00:52:18,489 --> 00:52:21,280
Sisi ni mbio fupi juu kidogo
wakati hivyo mimi nina kwenda kwa kuruhusu tu

1128
00:52:21,280 --> 00:52:23,670
guys kwa ufupi kuangalia hii.

1129
00:52:23,670 --> 00:52:26,430
Kukimbia ndani ID wako kama
nyie ni wadadisi.

1130
00:52:26,430 --> 00:52:30,030
Na nyie unaweza kuona nini
hii itakuwa uchapishaji nje.

1131
00:52:30,030 --> 00:52:30,640
SAWA.

1132
00:52:30,640 --> 00:52:34,990
>> Hivyo kitu ambacho tutaweza pia zinagusa
kidogo ni wazo la pointer hesabu.

1133
00:52:34,990 --> 00:52:38,180
Ambayo, kila ilivyo, ni
badala ya kurekebisha

1134
00:52:38,180 --> 00:52:42,610
maadili ya nini ni kuhifadhiwa
katika anuani ya pointer yako,

1135
00:52:42,610 --> 00:52:45,030
ni tu kwa kweli kubadilisha
anuani yenyewe.

1136
00:52:45,030 --> 00:52:49,420
Hivyo kama wewe kama binadamu alitaka
kurekebisha pointer yako mwenyewe,

1137
00:52:49,420 --> 00:52:52,700
namna gani kufanya hivyo ni tu
kufanya n mara ukubwa wa pointer.

1138
00:52:52,700 --> 00:52:53,240
Sawa?

1139
00:52:53,240 --> 00:52:54,810
>> Hivyo int.

1140
00:52:54,810 --> 00:52:58,580
Int ka wangapi
katika kumbukumbu ni int?

1141
00:52:58,580 --> 00:52:59,640
Ni wanne, sawa?

1142
00:52:59,640 --> 00:53:03,520
Hivyo kama mimi kujua nina safu ya yote
ints na mimi nataka kwa uhakika na moja

1143
00:53:03,520 --> 00:53:08,470
baadaye, Ningependa kujua mimi tu na
hoja ya pointer yangu chini ka nne, sawa?

1144
00:53:08,470 --> 00:53:12,440
Na hivyo n mara ukubwa
ya ka pointer

1145
00:53:12,440 --> 00:53:15,890
ni ka hata hivyo wengi uko tu
kwenda hoja pointer yako chini kwa.

1146
00:53:15,890 --> 00:53:20,350
>> Hivyo kwa mfano, kama tuna safu ya
ints, moja ya kwanza, hebu sema tu,

1147
00:53:20,350 --> 00:53:22,280
ni kuhifadhiwa kama 0x00.

1148
00:53:22,280 --> 00:53:26,150
Unajua moja ijayo ni kwenda kuwa katika
0x04 kwa sababu hiyo ni ka nne baadaye.

1149
00:53:26,150 --> 00:53:31,030
Na moja baada ya ambayo inaenda
kuwa 0x08 na kadhalika na kadhalika.

1150
00:53:31,030 --> 00:53:33,830
Na hivyo, guys, tuangalie.

1151
00:53:33,830 --> 00:53:36,640
>> Wote unafanya hapa ni
kwamba una pointer y

1152
00:53:36,640 --> 00:53:43,700
na wewe ni kuongeza kwamba kwa yako
kumbukumbu ili uweze hoja chini

1153
00:53:43,700 --> 00:53:45,559
vitalu ya kumbukumbu zilizotengwa.

1154
00:53:45,559 --> 00:53:46,850
Aina ya dhana ngazi za juu.

1155
00:53:46,850 --> 00:53:48,820
Nyie si haja
kujua kwa wiki hii,

1156
00:53:48,820 --> 00:53:51,290
lakini hiyo yote ni kufanya huko chini.

1157
00:53:51,290 --> 00:53:55,190

1158
00:53:55,190 --> 00:53:55,900
SAWA.

1159
00:53:55,900 --> 00:53:56,710
>> Utani wakati mwingine.

1160
00:53:56,710 --> 00:54:01,360

1161
00:54:01,360 --> 00:54:02,780
Masharti mawili kutembea ndani ya bar.

1162
00:54:02,780 --> 00:54:05,713
Mmoja wenu anaposema, Ningependa rom
na Coke maadili takataka.

1163
00:54:05,713 --> 00:54:08,796
Wengine anasema, itabidi udhuru
rafiki yangu, yeye si null kukoma.

1164
00:54:08,796 --> 00:54:10,390
Nyie kupata.

1165
00:54:10,390 --> 00:54:10,890
Pole.

1166
00:54:10,890 --> 00:54:13,490
Hii ni jinsi mimi kuweka mwenyewe
kwenda wakati mimi prep kwa sehemu

1167
00:54:13,490 --> 00:54:15,650
ni mimi kuingiza slides wanandoa mzaha.

1168
00:54:15,650 --> 00:54:16,150
Anyways.

1169
00:54:16,150 --> 00:54:21,460

1170
00:54:21,460 --> 00:54:21,960
SAWA.

1171
00:54:21,960 --> 00:54:24,290
Kabla ya mimi hoja on--
hivyo, kimsingi, tumekuwa

1172
00:54:24,290 --> 00:54:30,600
kufunikwa zote dhana
masuala yanayohusiana na kuyatumia.

1173
00:54:30,600 --> 00:54:34,090
Na kisha tunakwenda talk-- kusonga
zaidi, majadiliano juu ya nini hiyo ni muhimu

1174
00:54:34,090 --> 00:54:37,810
na jinsi inafaa katika
wazo la usimamizi wa kumbukumbu.

1175
00:54:37,810 --> 00:54:39,810
Lakini kabla ya kusonga mbele,
haina mtu yeyote una maswali

1176
00:54:39,810 --> 00:54:43,880
kuhusu matumizi pointer, nini kinaendelea
juu ya wakati wewe ni kujenga kuyatumia,

1177
00:54:43,880 --> 00:54:47,540
jinsi ni referencing kila
mengine, jinsi ndio dereferencing?

1178
00:54:47,540 --> 00:54:51,760
Maswali yoyote kuhusu
kwamba kabla mimi hoja juu ya?

1179
00:54:51,760 --> 00:54:53,060
SAWA.

1180
00:54:53,060 --> 00:54:54,770
Kubwa.

1181
00:54:54,770 --> 00:54:58,170
>> Hivyo hii inatuleta katika hii
kubwa dhana ngazi za juu

1182
00:54:58,170 --> 00:55:00,310
ya kumbukumbu ya usimamizi kwa ujumla.

1183
00:55:00,310 --> 00:55:02,720
Hivyo, kimsingi, katika
kompyuta yako, kuna

1184
00:55:02,720 --> 00:55:06,300
aina mbili za msingi za kumbukumbu au
mikoa ambayo kumbukumbu ni kuhifadhiwa.

1185
00:55:06,300 --> 00:55:10,210
Una hapa kile kinachoitwa
lundo na una chini hapa

1186
00:55:10,210 --> 00:55:11,550
kile kinachoitwa stack.

1187
00:55:11,550 --> 00:55:13,966
Na sisi ni kwenda kuzungumza kuhusu
stack kwanza kwa sababu ni

1188
00:55:13,966 --> 00:55:16,910
moja zaidi finagley kwamba
kuwa na aina ya conceptually

1189
00:55:16,910 --> 00:55:18,570
kuelewa nini kinaendelea.

1190
00:55:18,570 --> 00:55:23,930
>> Hivyo stack zote is-- kufikiria
kama stack kimwili ya kumbukumbu

1191
00:55:23,930 --> 00:55:28,880
ambapo una block ya kumbukumbu
hiyo ni kuweka kando kwa ajili ya mpango wako

1192
00:55:28,880 --> 00:55:30,180
wakati ni mbio.

1193
00:55:30,180 --> 00:55:34,480
Na hii ni mahali ambapo, kimsingi, kila
ya vigezo lako ni kuhifadhiwa.

1194
00:55:34,480 --> 00:55:38,300
Hivyo hii ni tu zoomed
katika picha ya kwamba stack.

1195
00:55:38,300 --> 00:55:41,060
Stack chini huko, mimi nina
zooming tu katika kidogo zaidi.

1196
00:55:41,060 --> 00:55:46,170
>> Hivyo, kimsingi, katika mkusanyiko una
rundo la kazi katika mpango wako.

1197
00:55:46,170 --> 00:55:48,250
Basi hebu tu kwenda nyuma
kwa mfano wiki mbili

1198
00:55:48,250 --> 00:55:51,450
ambapo tulikuwa na kazi yetu kuu
kama vile mchemraba kazi

1199
00:55:51,450 --> 00:55:56,410
ambapo sisi alijaribu kujenga kazi ambayo
cubed-- kwamba alichukua vigezo kama pembejeo,

1200
00:55:56,410 --> 00:55:59,110
cubed yao na kurudi
kuwarejesha kwenye kuu.

1201
00:55:59,110 --> 00:56:02,459
Hivyo njia kwamba hiyo ni kuhifadhiwa katika kumbukumbu
ni kwamba una kazi yako kuu

1202
00:56:02,459 --> 00:56:03,250
hapa chini.

1203
00:56:03,250 --> 00:56:06,630
Na kisha kwa kazi kila ziada
kwamba wewe piga na kuongeza juu ya kwamba,

1204
00:56:06,630 --> 00:56:07,960
kumbukumbu tu mwingi juu.

1205
00:56:07,960 --> 00:56:10,190
Fikiria kama stack kimwili.

1206
00:56:10,190 --> 00:56:13,570
>> Na hivyo kuwa nyote kuu
vigezo ya kazi yako kuu,

1207
00:56:13,570 --> 00:56:15,260
kila kitu ambacho kinaendelea hapa, kuhifadhiwa.

1208
00:56:15,260 --> 00:56:17,440
Na kisha wakati wewe kuitwa
mchemraba, unaendelea na

1209
00:56:17,440 --> 00:56:20,810
inajenga nakala za wale wote
vigezo na ni maduka yao

1210
00:56:20,810 --> 00:56:23,010
juu katika nafasi mbalimbali.

1211
00:56:23,010 --> 00:56:24,280
Na hivyo kwa nini sisi huduma?

1212
00:56:24,280 --> 00:56:29,220
Sababu sisi huduma ni kwamba hatuwezi tu
kutumia vigezo here-- vigezo

1213
00:56:29,220 --> 00:56:33,080
here-- na sisi kuwabadilisha, tunatarajia
wao pia inaweza kubadilishwa hapa, sawa?

1214
00:56:33,080 --> 00:56:35,910
>> Wazo ni kwamba wao ni kuokolewa
katika maeneo mbalimbali katika kumbukumbu

1215
00:56:35,910 --> 00:56:40,540
hivyo kwamba, wakati wewe ni kupata mbalimbali
kazi, nini unafikiri kinachotokea

1216
00:56:40,540 --> 00:56:45,520
si kweli yanatokea kwa sababu
bits kumbukumbu si yanahusiana.

1217
00:56:45,520 --> 00:56:50,530
Na hivyo swali kwamba ni kweli
muhimu kwetu aina ya kuelewa

1218
00:56:50,530 --> 00:56:54,100
ni, nini kama, wakati sisi ni mbio
Mpango, ukubwa wa kazi

1219
00:56:54,100 --> 00:56:57,159
stack frame-- hivyo kimwili, jinsi
kumbukumbu kiasi gani tuna kuwapa?

1220
00:56:57,159 --> 00:56:59,950
Labda ni kazi kubwa hivyo sisi
na kuwapa kumbukumbu kwamba mengi.

1221
00:56:59,950 --> 00:57:02,230
Lakini kama ilivyokuwa ndogo tunatarajia
haja ndogo kidogo.

1222
00:57:02,230 --> 00:57:05,980
>> Hivyo wazo ni kwamba wakati sisi ni mbio
Mpango ukubwa wa kazi ambayo

1223
00:57:05,980 --> 00:57:09,100
unategemea jinsi wengi
vigezo na aina ya vigezo

1224
00:57:09,100 --> 00:57:10,940
kwamba tunataka kuwapa.

1225
00:57:10,940 --> 00:57:13,910
Lakini nini kama idadi ya
variables-- na ukubwa wao,

1226
00:57:13,910 --> 00:57:16,140
hiyo niliamua
na wewe encoder lakini

1227
00:57:16,140 --> 00:57:20,580
imedhamiria kwa halisi
mtumiaji wa programu yako.

1228
00:57:20,580 --> 00:57:24,240
Hivyo kama mimi alitaka kujenga kazi
kwamba alichukua masharti kutoka kwa mtumiaji,

1229
00:57:24,240 --> 00:57:27,630
lakini mimi si kweli kujua jinsi kubwa
masharti hayo ni, ni vigumu kwa mimi

1230
00:57:27,630 --> 00:57:30,220
kwa allot maalum
kiasi cha kumbukumbu inahitajika.

1231
00:57:30,220 --> 00:57:30,920
Sawa?

1232
00:57:30,920 --> 00:57:35,234
>> Kwa sababu kama hii function-- kama
mtumiaji huyu pembejeo kamba kubwa,

1233
00:57:35,234 --> 00:57:37,650
itakuja kujenga makosa
ya kile kinachoitwa kimsingi

1234
00:57:37,650 --> 00:57:42,190
stack kufurika ambapo kwenda zaidi
mipaka ya kumbukumbu kwamba wewe.

1235
00:57:42,190 --> 00:57:44,250
Na hivyo basi tunafanya nini?

1236
00:57:44,250 --> 00:57:47,290
Kama hatuwezi tu kujenga kubwa hii
stack ambayo inaweza kuokoa kila kitu,

1237
00:57:47,290 --> 00:57:50,260
tunafanya nini ili kutatua tatizo hilo?

1238
00:57:50,260 --> 00:57:54,364
>> Hivyo sisi ni kwenda kuendelea na majadiliano
kuhusu aina hii ya pili ya kumbukumbu

1239
00:57:54,364 --> 00:57:56,780
na kisha tunaweza kuongea kuhusu jinsi
tunaweza kutumia pamoja mawili

1240
00:57:56,780 --> 00:57:58,550
kutatua swali hilo.

1241
00:57:58,550 --> 00:58:01,024
Hivyo sasa tunakwenda hoja juu
kwa sehemu mbalimbali za kumbukumbu

1242
00:58:01,024 --> 00:58:01,690
katika kompyuta yetu.

1243
00:58:01,690 --> 00:58:03,215
Hiyo inaitwa lundo.

1244
00:58:03,215 --> 00:58:07,150
Hivyo chungu yote ni bwawa
ya inapatikana kumbukumbu kwamba

1245
00:58:07,150 --> 00:58:08,690
inaweza kuwa zilizotengwa dynamically.

1246
00:58:08,690 --> 00:58:12,420
Hivyo kwamba anaweza kubadilisha wakati
mpango wako ni mbio.

1247
00:58:12,420 --> 00:58:15,160
>> Na hivyo mkoa wa
outnyttjade kumbukumbu ambayo inaweza

1248
00:58:15,160 --> 00:58:18,200
kuwa allowed-- ambayo inaweza kuwa
kura na kazi

1249
00:58:18,200 --> 00:58:20,490
aitwaye malloc, au mgao kumbukumbu.

1250
00:58:20,490 --> 00:58:23,110
Hivyo, kimsingi, wakati
wewe ni mbio mpango,

1251
00:58:23,110 --> 00:58:29,560
unaweza dynamically kuunda kumbukumbu kutoka
lundo na kutumia yote chini hapa.

1252
00:58:29,560 --> 00:58:34,280
Na hivyo basi, yote ya kazi yako
hapa unaweza kupata lundo.

1253
00:58:34,280 --> 00:58:37,960
>> Na hivyo malloc, wazo hili ambalo Daudi
aina ya haraka, kwa ufupi glossed juu

1254
00:58:37,960 --> 00:58:41,570
katika hotuba, ni njia tu kwa
kudhibiti kumbukumbu yako.

1255
00:58:41,570 --> 00:58:45,470
Kama, wakati wewe ni kujenga tu
stack kazi, wakati uko tu

1256
00:58:45,470 --> 00:58:48,290
kuwa kazi yako kuu
na kazi yako bila mpangilio,

1257
00:58:48,290 --> 00:58:52,270
unafikiri wao kama watoto kwamba tu
walikimbia wakati yalifanyika pamoja nao.

1258
00:58:52,270 --> 00:58:53,690
Walikuwa watoto ni mbaya.

1259
00:58:53,690 --> 00:58:55,515
Wewe kujenga yao,
kuwafundisha jambo fulani,

1260
00:58:55,515 --> 00:58:57,640
na kisha wakati unataka
kuzipata tena wao uko

1261
00:58:57,640 --> 00:58:59,850
si pale kwa sababu yako
kumbukumbu tu walikimbia.

1262
00:58:59,850 --> 00:59:04,140
>> Lakini malloc, au chungu, ni njia
ya kuwa na watoto bora, ambapo

1263
00:59:04,140 --> 00:59:07,090
unaweza aina ya kuunda
nao, hawawajui yao maadili,

1264
00:59:07,090 --> 00:59:11,080
kutumia them-- aliyepiga kweli
bad-- kuzitumia hata hivyo alitaka,

1265
00:59:11,080 --> 00:59:14,002
lakini kisha kuwa na uwezo wa kudhibiti
yao na kisha bure juu ya kumbukumbu

1266
00:59:14,002 --> 00:59:14,960
wakati wowote unahitaji yao.

1267
00:59:14,960 --> 00:59:18,085
Hivyo basi, wakati wewe ni kosa na yako
kazi, watoto kuja nyuma yenu

1268
00:59:18,085 --> 00:59:20,290
na bado una data kwamba kuna.

1269
00:59:20,290 --> 00:59:25,690
>> Hivyo njia kwamba sisi malloc, au kuunda,
kumbukumbu ni kwa kazi batili nyota

1270
00:59:25,690 --> 00:59:26,790
malloc ukubwa katika ka.

1271
00:59:26,790 --> 00:59:29,730
Hivyo hiyo ni mfano
kwa nini sisi kufanya hivyo.

1272
00:59:29,730 --> 00:59:35,800
Hivyo mfano ni sisi kujenga pointer
ya aina int int nyota pointer sawa

1273
00:59:35,800 --> 00:59:38,120
malloc ukubwa wa int.

1274
00:59:38,120 --> 00:59:41,734
Hivyo sababu tunafanya ukubwa
ya na si tu number--

1275
00:59:41,734 --> 00:59:43,650
kwa sababu sisi wote tunajua kwamba
int ni ka nne,

1276
00:59:43,650 --> 00:59:48,310
right-- lakini int ni nne tu
ka juu ya mifumo ya uendeshaji fulani.

1277
00:59:48,310 --> 00:59:50,410
>> Wazo kwa ajili yetu kama
programmers ni kwamba sisi

1278
00:59:50,410 --> 00:59:53,160
unataka kujenga kificho kwamba wanaweza
kukimbia kwenye kompyuta wote, siyo tu

1279
00:59:53,160 --> 00:59:54,860
rahisi wetu kompyuta.

1280
00:59:54,860 --> 00:59:58,350
Na hivyo ndiyo sababu sisi kama kutumia
ukubwa wa na si tu namba nne.

1281
00:59:58,350 --> 00:59:59,970
Je, hiyo mantiki kwa kila mtu?

1282
00:59:59,970 --> 01:00:03,930
Hivyo ukubwa of-- yote ni C
kazi au alama kwamba

1283
01:00:03,930 --> 01:00:09,350
anaelezea jinsi wengi ka ya kumbukumbu gani
aina fulani ya kutofautiana kuchukua.

1284
01:00:09,350 --> 01:00:11,150
Hivyo katika kesi hii, ukubwa wa int ni nne.

1285
01:00:11,150 --> 01:00:12,090
Nne ka.

1286
01:00:12,090 --> 01:00:15,490
Na malloc ni kwenda bure
up ka nne katika chungu yako,

1287
01:00:15,490 --> 01:00:18,790
basi unaweza kisha kutumia katika kuu yako
kazi na kuwa na uwezo wa kuhifadhi kumbukumbu.

1288
01:00:18,790 --> 01:00:22,460

1289
01:00:22,460 --> 01:00:24,860
Ni kila mtu wazi juu ya kwamba hadi sasa?

1290
01:00:24,860 --> 01:00:25,918
Yeah?

1291
01:00:25,918 --> 01:00:28,122
>> Watazamaji: mimi nina wazi lakini
tu kuwa juu ya clear--

1292
01:00:28,122 --> 01:00:28,705
ANDI PENG: Sawa.

1293
01:00:28,705 --> 01:00:29,246
Kabisa faini.

1294
01:00:29,246 --> 01:00:32,176
Watazamaji: --size ya ni [inaudible]
Unaweza kweli [inaudible]

1295
01:00:32,176 --> 01:00:34,384
na itakuwa kweli kufanya
jambo ambalo sisi unataka kwa.

1296
01:00:34,384 --> 01:00:35,380
Siyo baadhi pseudocode.

1297
01:00:35,380 --> 01:00:35,878
>> ANDI PENG: Hapana

1298
01:00:35,878 --> 01:00:36,874
>> Watazamaji: Ni kama thing-- halisi

1299
01:00:36,874 --> 01:00:37,372
>> ANDI PENG: Hii ni kanuni ya kweli.

1300
01:00:37,372 --> 01:00:38,455
>> Watazamaji: --we anaweza kuitumia.

1301
01:00:38,455 --> 01:00:39,862
Ni halisi.

1302
01:00:39,862 --> 01:00:40,418
Baridi.

1303
01:00:40,418 --> 01:00:41,751
ANDI PENG: Michezo ya kuja na C.

1304
01:00:41,751 --> 01:00:43,475
Watazamaji: Kwamba inafanya maisha yangu furaha.

1305
01:00:43,475 --> 01:00:45,550
ANDI PENG: Naam.

1306
01:00:45,550 --> 01:00:48,610
Hivyo kama wewe ni programu wavivu
kama mimi aina ya niko wakati mwingine,

1307
01:00:48,610 --> 01:00:50,402
Mimi si kama kukariri
nini ukubwa wa int

1308
01:00:50,402 --> 01:00:52,734
yaani, sipendi kukumbuka
na ukubwa wa kuelea ni.

1309
01:00:52,734 --> 01:00:55,160
Ukubwa wa tu anakwambia nini
ni na hiyo ni rahisi sana.

1310
01:00:55,160 --> 01:00:59,880

1311
01:00:59,880 --> 01:01:00,440
>> Sawa.

1312
01:01:00,440 --> 01:01:02,160
Kwa hiyo, jambo muhimu
kwamba nyie wote wanataka

1313
01:01:02,160 --> 01:01:04,620
kukumbuka wakati uko
kutumia malloc ni kwamba daima

1314
01:01:04,620 --> 01:01:06,400
kuwa na kuangalia kuona kama ni null.

1315
01:01:06,400 --> 01:01:08,630
Hivyo kama nilivyosema, nyuma ya
kwamba picha ya lundo.

1316
01:01:08,630 --> 01:01:11,390
Lundo ni kubwa hii
mkusanyiko wa kumbukumbu kwamba nimepata.

1317
01:01:11,390 --> 01:01:16,740
Na unataka kuwa na uwezo wa kuchukua bonge
ya kumbukumbu kutoka humo na matumizi yake, sawa?

1318
01:01:16,740 --> 01:01:19,750
>> Lakini nini kama wewe huna
kumbukumbu zaidi katika kuwa chungu?

1319
01:01:19,750 --> 01:01:23,650
Nini kama nimekuwa tayari kutumika zote
yake na mimi kujaribu malloc zaidi?

1320
01:01:23,650 --> 01:01:24,864
Hiyo haipo.

1321
01:01:24,864 --> 01:01:26,780
Naam, hiyo ni kwa nini uko
kwenda kupata kosa.

1322
01:01:26,780 --> 01:01:29,220
Wewe ni kwenda kosa seg. Wewe ni kwenda
kuwa na segmentation kosa ambapo

1323
01:01:29,220 --> 01:01:30,940
kujaribu kupata mambo ambayo si huko.

1324
01:01:30,940 --> 01:01:33,180
Na hivyo njia ya sisi kufanya
kuwa na njia hiyo sisi

1325
01:01:33,180 --> 01:01:36,120
kuzuia kwamba ni kwamba sisi kuangalia
ili kuona kama pointer ya null.

1326
01:01:36,120 --> 01:01:41,650
>> Hivyo kama ningekuwa malloc kitu
na nilikuwa kumbukumbu tena,

1327
01:01:41,650 --> 01:01:45,501
ambayo ingeweza magazeti makosa kwa sababu
pointer akarudi wewe ni tu null.

1328
01:01:45,501 --> 01:01:47,750
Na hivyo njia ya sisi kufanya Haya
hii ni mpango mkubwa,

1329
01:01:47,750 --> 01:01:52,140
tu kukariri Haya ni kwamba yoyote
wakati wewe kujaribu malloc chochote,

1330
01:01:52,140 --> 01:01:55,300
wewe ni kwenda haja ya
kuangalia kuona kama ni null.

1331
01:01:55,300 --> 01:01:58,257
Kwa sababu wakati wowote kujaribu
kupata kumbukumbu kutoka lundo,

1332
01:01:58,257 --> 01:02:00,340
daima kuwa kwa kufanya
kuhakikisha kwamba una kumbukumbu.

1333
01:02:00,340 --> 01:02:01,350
Hayo ni yote ni.

1334
01:02:01,350 --> 01:02:04,980
>> Hivyo pretty much wale watatu
mstari wa kanuni, kukariri.

1335
01:02:04,980 --> 01:02:06,830
Kila wakati malloc, plop yao katika.

1336
01:02:06,830 --> 01:02:08,190
Wewe ni kwenda haja yao.

1337
01:02:08,190 --> 01:02:10,540
Kwa sababu Mimi kuhakikisha, tunakwenda
mtihani wewe juu ya kesi na kompyuta yako

1338
01:02:10,540 --> 01:02:13,498
ni kwenda kulipuka kwa sababu wewe ni
kwenda kujaribu kupata kumbukumbu hiyo ni

1339
01:02:13,498 --> 01:02:16,680
si pale na mambo ni kwenda
ajali na si kwenda kuwa nzuri.

1340
01:02:16,680 --> 01:02:19,290
Hivyo tu kuchimba kwamba ndani ya ubongo wako.

1341
01:02:19,290 --> 01:02:21,370
Malloc, null.

1342
01:02:21,370 --> 01:02:22,360
Nzuri.

1343
01:02:22,360 --> 01:02:22,860
Sawa.

1344
01:02:22,860 --> 01:02:26,280

1345
01:02:26,280 --> 01:02:28,340
>> Basi hii unasababisha
Suala la nini kinatokea

1346
01:02:28,340 --> 01:02:30,550
baada ya sisi ni kosa kutumia kwamba kumbukumbu.

1347
01:02:30,550 --> 01:02:32,390
Kwa sababu wazo zima
ya kuwa na malloc ilikuwa

1348
01:02:32,390 --> 01:02:36,460
kwamba tuna rundo hili kwamba tunaweza kuchukua
kumbukumbu kutoka na kisha tunaweza kuitumia.

1349
01:02:36,460 --> 01:02:37,220
Sawa?

1350
01:02:37,220 --> 01:02:40,550
Na kisha nini tuna kukumbuka
ni kwamba, baada ya sisi ni kosa na hilo,

1351
01:02:40,550 --> 01:02:41,900
sisi kisha unaweza bure hilo.

1352
01:02:41,900 --> 01:02:42,400
Basi ni kwenda.

1353
01:02:42,400 --> 01:02:43,979
Tunaweza basi ni kwenda.

1354
01:02:43,979 --> 01:02:47,020
Au mwingine ni pia kwenda kuvuja
kumbukumbu na mambo zaidi mbaya kutokea.

1355
01:02:47,020 --> 01:02:49,010
>> Kimsingi, wakati wowote
wewe ni kugusa kumbukumbu,

1356
01:02:49,010 --> 01:02:51,800
mambo mabaya kitatokea kama wewe
hawafanyi mambo kwa usahihi.

1357
01:02:51,800 --> 01:02:55,150
Hivyo kuwa na kuangalia kuona, kwanza,
kama una kumbukumbu za kutosha.

1358
01:02:55,150 --> 01:02:58,700
Na kisha baada ya wewe ni kosa, unataka
bure ni na kuruhusu mfumo wa uendeshaji wako

1359
01:02:58,700 --> 01:03:00,690
kuchukua nyuma.

1360
01:03:00,690 --> 01:03:04,870
Hivyo njia sisi kufanya hivyo ni tu kwamba
kazi, utupu bure, na pointer

1361
01:03:04,870 --> 01:03:06,370
kwa kuwa chungu ya kumbukumbu.

1362
01:03:06,370 --> 01:03:08,680
>> Hivyo mfano ni bure pointer.

1363
01:03:08,680 --> 01:03:11,580
Ni rahisi, rahisi,
hawataki kusahau hayo.

1364
01:03:11,580 --> 01:03:14,687
Hivyo kuangalia kuona kama ni null, bure.

1365
01:03:14,687 --> 01:03:15,270
Kila mtu mwema?

1366
01:03:15,270 --> 01:03:22,660

1367
01:03:22,660 --> 01:03:27,325
Hivyo mara nyingine tena, kanuni na kwamba nyie
Unaweza aina ya haraka kuchukua mtazamo saa.

1368
01:03:27,325 --> 01:03:34,964

1369
01:03:34,964 --> 01:03:37,880
Najua ni mengi ya syntax mpya na
ni sawa kama wewe ni kama, ah,

1370
01:03:37,880 --> 01:03:38,963
hiyo ina maana gani tena?

1371
01:03:38,963 --> 01:03:40,250
Hakuna wasiwasi.

1372
01:03:40,250 --> 01:03:46,785
Haya yote ilikuwa na maana kuwa ni kuonyesha
hatua, jinsi mambo yote haya

1373
01:03:46,785 --> 01:03:47,660
inaweza kutumika kwa pamoja.

1374
01:03:47,660 --> 01:03:52,190

1375
01:03:52,190 --> 01:03:54,190
Hivyo kwamba ni kuweka pamoja
kama kundi la zamani

1376
01:03:54,190 --> 01:03:56,532
slides sisi tu akaenda
kupitia katika programu moja.

1377
01:03:56,532 --> 01:03:58,240
Watazamaji: Kwa njia
tuweze actually--

1378
01:03:58,240 --> 01:03:59,570
ANDI PENG: Kwa njia hiyo
tunaweza kweli matumizi.

1379
01:03:59,570 --> 01:04:02,379
Unaweza plop kwamba katika ID yako,
unaweza kukimbia na ingekuwa kazi.

1380
01:04:02,379 --> 01:04:02,920
Watazamaji: Sawa.

1381
01:04:02,920 --> 01:04:04,140
Hivyo hiyo ni kweli?

1382
01:04:04,140 --> 01:04:05,580
>> ANDI PENG: Hiyo ni kweli.

1383
01:04:05,580 --> 01:04:06,430
Naam.

1384
01:04:06,430 --> 01:04:08,690
Mimi kujaribu kufanya hivyo hivyo
fonts ni tofauti hivyo

1385
01:04:08,690 --> 01:04:11,770
kwamba wakati wowote mimi aina halisi
kificho herufi ni herufi kificho

1386
01:04:11,770 --> 01:04:15,471
na kwamba kumbuka kificho wangu ni tofauti, lakini
Sijui kama kwamba kweli kazi.

1387
01:04:15,471 --> 01:04:16,012
Watazamaji: Hapana

1388
01:04:16,012 --> 01:04:17,190
Nadhani that--

1389
01:04:17,190 --> 01:04:18,213
>> ANDI PENG: Sawa.

1390
01:04:18,213 --> 01:04:20,578
>> Watazamaji: --sometimes
[Inaudible] na mimi nina

1391
01:04:20,578 --> 01:04:23,416
kama, kwamba itakuwa kweli cute
kama ilikuwa kweli jambo zinatumiwa

1392
01:04:23,416 --> 01:04:24,812
lakini basi si jambo inatumika.

1393
01:04:24,812 --> 01:04:26,270
Mimi kama kwamba hili ni jambo la inatumika.

1394
01:04:26,270 --> 01:04:27,010
>> ANDI PENG: Sawa.

1395
01:04:27,010 --> 01:04:27,510
Naam.

1396
01:04:27,510 --> 01:04:28,430
Mimi itabidi kupita kwamba pamoja.

1397
01:04:28,430 --> 01:04:33,266
Kuwa kama Daudi, watoto ni kweli
huzuni wakati wewe kuandika kanuni bandia.

1398
01:04:33,266 --> 01:04:34,240
Sawa.

1399
01:04:34,240 --> 01:04:34,740
Yeah?

1400
01:04:34,740 --> 01:04:37,686
>> Watazamaji: Hivyo PTR hapa
ni kweli si pointer,

1401
01:04:37,686 --> 01:04:41,130
ni kuzuia wa kumbukumbu?

1402
01:04:41,130 --> 01:04:45,130
>> ANDI PENG: Kwa hiyo wewe kuzungumza juu
mstari wa kwanza au moja chini hapa?

1403
01:04:45,130 --> 01:04:48,170
Je, wewe ni kuzungumza juu ya hii moja hapa?

1404
01:04:48,170 --> 01:04:50,910
>> Watazamaji: PTR ni
mambo mbalimbali in--

1405
01:04:50,910 --> 01:04:53,230
>> ANDI PENG: Naam, hivyo hapa
nini mimi doing-- kweli,

1406
01:04:53,230 --> 01:04:54,660
hebu tu kwenda kwa njia ya hapa.

1407
01:04:54,660 --> 01:04:57,120
Aina hii ya mahusiano katika
vizuri wote wa dhana.

1408
01:04:57,120 --> 01:05:01,840
Hivyo hapa tuna int nyota PTR.

1409
01:05:01,840 --> 01:05:04,160
Hivyo int pointer, hapo ndipo
sisi ni kweli kujenga

1410
01:05:04,160 --> 01:05:06,550
pointer kwamba pointi kwa integer.

1411
01:05:06,550 --> 01:05:08,230
Vizuri, ni kwenda kwa uhakika na integer.

1412
01:05:08,230 --> 01:05:12,135
Na tunakwenda malloc, au
kuwapa, kumbukumbu ya kutosha kura

1413
01:05:12,135 --> 01:05:13,200
kuhifadhi integer.

1414
01:05:13,200 --> 01:05:14,910
Hivyo ka nne katika kesi hii.

1415
01:05:14,910 --> 01:05:18,024
>> Na kisha kama kuwa sawa sawa NULL
sawa NULL tunakwenda magazeti.

1416
01:05:18,024 --> 01:05:20,440
Oh, una makosa kwa sababu
uko nje ya kumbukumbu, sawa?

1417
01:05:20,440 --> 01:05:22,814
Vinginevyo moja kurudi,
kwamba tu anasema mpango wako

1418
01:05:22,814 --> 01:05:24,170
kwamba nimepata kosa.

1419
01:05:24,170 --> 01:05:26,850
Na kisha kama huna
na kwamba kumbukumbu, ni

1420
01:05:26,850 --> 01:05:33,230
kwenda kuhifadhi chochote kupata
int anatoa katika eneo

1421
01:05:33,230 --> 01:05:35,460
na kuweka kama thamani ya pointer.

1422
01:05:35,460 --> 01:05:38,500
Hivyo ni kweli kwenda
kimwili kufuta thamani huu

1423
01:05:38,500 --> 01:05:41,702
na kuweka chochote kupata faida int.

1424
01:05:41,702 --> 01:05:43,910
Na kisha utaenda
magazeti chochote aliingia.

1425
01:05:43,910 --> 01:05:46,080
>> Watazamaji: Na hiyo ndiyo
kwenda kuwa katika chungu?

1426
01:05:46,080 --> 01:05:47,060
>> ANDI PENG: Hiyo inaenda
kuwa katika chungu.

1427
01:05:47,060 --> 01:05:48,768
>> Watazamaji: Na ili
itakuwa kupatikana.

1428
01:05:48,768 --> 01:05:51,220
ANDI PENG: Hasa.

1429
01:05:51,220 --> 01:05:52,600
Nzuri.

1430
01:05:52,600 --> 01:05:53,756
Nzuri.

1431
01:05:53,756 --> 01:05:59,289
>> Watazamaji: Hivyo wakati sisi bure PTR katika hii
Hatua ya mwisho, sisi ni kumkomboa pointer

1432
01:05:59,289 --> 01:06:00,724
au tuko kumkomboa kuzuia?

1433
01:06:00,724 --> 01:06:01,390
ANDI PENG: Naam.

1434
01:06:01,390 --> 01:06:05,570
Hivyo sisi ni kumkomboa pointer
vizuri, kumkomboa block ya kumbukumbu.

1435
01:06:05,570 --> 01:06:08,780
Hivyo njia pekee tunaweza hata kupata
kumbukumbu ni kwa kuwa pointer.

1436
01:06:08,780 --> 01:06:10,730
Kama huna pointer, uko
kama, loo, sijui ni wapi,

1437
01:06:10,730 --> 01:06:11,290
sawa?

1438
01:06:11,290 --> 01:06:13,956
Hivyo kama wewe ni bure, wewe ni kimsingi
kumkomboa kuzuia kwamba nzima.

1439
01:06:13,956 --> 01:06:16,500
Kisha kompyuta yako anajua, loo,
kuna kitu zinatumiwa hapa,

1440
01:06:16,500 --> 01:06:19,396
Naweza tu kuweka takataka
maadili nyuma ndani yake tena.

1441
01:06:19,396 --> 01:06:21,590
>> Watazamaji: Hivyo integers kufanya kuwepo katika suala hilo?

1442
01:06:21,590 --> 01:06:23,481
>> ANDI PENG: Je, integers zipo?

1443
01:06:23,481 --> 01:06:23,980
Pole.

1444
01:06:23,980 --> 01:06:25,271
Je, unaweza rephrase swali lako?

1445
01:06:25,271 --> 01:06:28,330
Watazamaji: Mimi maana, baada ya wewe bure
pointer, integer kwamba kupata,

1446
01:06:28,330 --> 01:06:29,990
kwamba bado zipo?

1447
01:06:29,990 --> 01:06:31,360
>> ANDI PENG: Hapana, haiwezekani.

1448
01:06:31,360 --> 01:06:34,070

1449
01:06:34,070 --> 01:06:37,550
Au angalau kutakuwa na zipo katika yako
kumbukumbu kabla kompyuta yako anafanya

1450
01:06:37,550 --> 01:06:40,231
chochote kwa hayo, lakini kuna
hakuna njia kwa ajili ya kupata hiyo.

1451
01:06:40,231 --> 01:06:41,480
Kwa sababu wewe huru pointer.

1452
01:06:41,480 --> 01:06:43,150
Huwezi kujua ambapo ni tena.

1453
01:06:43,150 --> 01:06:43,650
Naam.

1454
01:06:43,650 --> 01:06:46,500

1455
01:06:46,500 --> 01:06:48,560
>> Mimi nina kwenda kuendelea na hapa.

1456
01:06:48,560 --> 01:06:49,060
Phew.

1457
01:06:49,060 --> 01:06:53,012
Hivyo sisi ni kupitia kura ya dhana
matatizo ya usimamizi wa kumbukumbu

1458
01:06:53,012 --> 01:06:54,720
na tunakwenda tu
kimsingi kutumia

1459
01:06:54,720 --> 01:06:57,090
5, dakika 10 kwenda
zaidi ya syntax mambo ambayo

1460
01:06:57,090 --> 01:07:03,240
itakuwa inatumika na manufaa kwa nyie,
lakini kitu pia conceptually huko nje.

1461
01:07:03,240 --> 01:07:03,740
SAWA.

1462
01:07:03,740 --> 01:07:06,930
>> Hivyo sisi ni kabisa kubadilisha gia hapa.

1463
01:07:06,930 --> 01:07:09,360
Kumbukumbu usimamizi, vigumu.
Kuyatumia, magumu. Ndiyo.

1464
01:07:09,360 --> 01:07:10,530
Ni kweli, ngumu kweli kweli.

1465
01:07:10,530 --> 01:07:11,270
Kabisa faini.

1466
01:07:11,270 --> 01:07:13,800
Hiyo ni kwa nini kipande yako ni
kwenda kuwa ngumu kweli kweli.

1467
01:07:13,800 --> 01:07:17,740
Lakini kama wewe kwenda na kufanya
mambo ambayo tuko

1468
01:07:17,740 --> 01:07:19,860
wanatakiwa kufanya, kufanya
mambo hakika ni null,

1469
01:07:19,860 --> 01:07:21,830
kuhakikisha kuangalia kama mambo ni
null, kuhakikisha bure kumbukumbu,

1470
01:07:21,830 --> 01:07:23,910
kufanya mambo uhakika si
kuvuja, wewe utakuwa na nzuri.

1471
01:07:23,910 --> 01:07:25,761
Utakuwa kuweka.

1472
01:07:25,761 --> 01:07:26,260
Sawa.

1473
01:07:26,260 --> 01:07:30,870
Hivyo sisi ni kwenda kuhamia katika hii
dhana mpya kabisa ya redirection.

1474
01:07:30,870 --> 01:07:33,201
Na hivyo kabla ya sasa,
njia kuu kwamba tumekuwa

1475
01:07:33,201 --> 01:07:35,700
wamekuwa mazungumzo na yetu
mipango ni kupitia pembejeo kiwango

1476
01:07:35,700 --> 01:07:36,533
na pato standard.

1477
01:07:36,533 --> 01:07:37,040
Sawa?

1478
01:07:37,040 --> 01:07:39,230
Sisi kama pembejeo mtumiaji
mambo na kompyuta

1479
01:07:39,230 --> 01:07:42,090
mtemi ni nyuma na sisi katika wastaafu.

1480
01:07:42,090 --> 01:07:44,770
>> Lakini kuna wengine
njia kwa sisi kuingiliana

1481
01:07:44,770 --> 01:07:47,810
na kompyuta na yetu
mipango ambayo si mimi tu

1482
01:07:47,810 --> 01:07:50,245
mambo kimwili kuandika
katika wakati mimi nina ilisababisha.

1483
01:07:50,245 --> 01:07:52,620
Na njia ya sisi kufanya hivyo ni
kupitia mkubwa kuliko karoti

1484
01:07:52,620 --> 01:07:53,453
na bomba alama.

1485
01:07:53,453 --> 01:07:55,970

1486
01:07:55,970 --> 01:07:58,630
Ili tuweze pia kusoma na
kuandika kwa files kutumia hiyo.

1487
01:07:58,630 --> 01:08:03,230
>> Hivyo njia kwamba sisi kufanya hivyo ni
mkubwa kuliko karoti, wote ni kufanya

1488
01:08:03,230 --> 01:08:07,410
anaandika chochote yako
faili ana faili tofauti.

1489
01:08:07,410 --> 01:08:11,870
Hivyo kwa mfano, kama mimi
alitaka kukimbia hujambo dunia

1490
01:08:11,870 --> 01:08:14,330
na nilitaka pato kwa
kuokolewa katika faili mwingine

1491
01:08:14,330 --> 01:08:17,359
na si tu kuchapishwa na mimi, mimi
Unaweza tu kufanya kubwa zaidi kuliko karoti,

1492
01:08:17,359 --> 01:08:18,410
output.txt.

1493
01:08:18,410 --> 01:08:22,609
Hivyo yote anafanya ni kuchukua
hello.world mpango wangu,

1494
01:08:22,609 --> 01:08:26,359
na chochote pato ni, ni
kuokoa katika faili inayoitwa output.txt.

1495
01:08:26,359 --> 01:08:29,850
Hivyo njia kwamba Daudi alifanya
.csv na majina ya wanafunzi,

1496
01:08:29,850 --> 01:08:32,310
ni sawa kwamba nyie wanaweza kufanya.

1497
01:08:32,310 --> 01:08:35,137
>> Na nini hasa
muhimu hapa ni mkubwa

1498
01:08:35,137 --> 01:08:38,220
than-- mbili kubwa kuliko karoti
ishara ambayo unaweza append kwa pato

1499
01:08:38,220 --> 01:08:40,795
file, ambayo ina maana kwamba
unaweza tu kuongeza juu yake.

1500
01:08:40,795 --> 01:08:43,420
Unaweza tu kuendelea kuongeza kwa
output.txt wa kila kitu ziada

1501
01:08:43,420 --> 01:08:44,490
kwamba unafanya.

1502
01:08:44,490 --> 01:08:48,010
Au, kama kuanza kuingia katika zaidi
mipango ngumu, mbili zaidi

1503
01:08:48,010 --> 01:08:50,939
kuliko karoti, kwamba tu prints
nje ujumbe wa makosa.

1504
01:08:50,939 --> 01:08:53,340
Hivyo kusema kuwa kampuni kubwa
Kiasi cha ujumbe wa makosa

1505
01:08:53,340 --> 01:08:54,810
na unataka kusoma
kupitia wote na wewe

1506
01:08:54,810 --> 01:08:56,450
hawataki kuwa na kitabu
kupitia terminal yako,

1507
01:08:56,450 --> 01:08:58,651
unaweza kweli tu kufanya
mkubwa kuliko output.txt

1508
01:08:58,651 --> 01:09:00,359
na ni kwenda kuokoa
wote wa makosa yako

1509
01:09:00,359 --> 01:09:02,900
katika faili inayoitwa output.txt kwamba
unaweza kwenda kupitia na kusoma.

1510
01:09:02,900 --> 01:09:04,622
Watazamaji: wapi faili maandishi kuokolewa?

1511
01:09:04,622 --> 01:09:07,330
ANDI PENG: Ni kuokolewa katika moja
directory kwamba mpango wako ni.

1512
01:09:07,330 --> 01:09:09,830
Hivyo wewe tu kwenda nyuma na kuangalia kwa ajili yake.

1513
01:09:09,830 --> 01:09:11,930
Na kitu kimoja sisi
anaweza kufanya kwa ajili ya pembejeo ni

1514
01:09:11,930 --> 01:09:14,300
tuweze kweli kuchukua
yaliyomo ya baadhi ya faili

1515
01:09:14,300 --> 01:09:16,380
na tunaweza pembejeo kwamba katika mpango wetu.

1516
01:09:16,380 --> 01:09:19,930
Hivyo badala ya kuwa na kufanya amri
hoja mstari wa wapi kimwili

1517
01:09:19,930 --> 01:09:21,680
kuwa na aina ya mambo
kila wakati, wewe

1518
01:09:21,680 --> 01:09:27,890
unaweza kweli tu na faili inayoitwa
input.txt kwamba tu kuiweka wote katika.

1519
01:09:27,890 --> 01:09:31,970
>> Na kisha bomba ni hasa kwa sababu ya baridi
inaweza kuchukua pato la mpango moja

1520
01:09:31,970 --> 01:09:34,170
na kuitumia kama pembejeo
ya mpango mwingine.

1521
01:09:34,170 --> 01:09:38,430
Hivyo kwa mfano, katika guys wako Vigenere,
kuna mstari wa kanuni kwamba

1522
01:09:38,430 --> 01:09:42,010
guys ni mbio kwamba labda labda
si kweli kujua nini ilikuwa doing--

1523
01:09:42,010 --> 01:09:46,910
hii ./generate 1000 bomba ./42.

1524
01:09:46,910 --> 01:09:47,510
Sawa?

1525
01:09:47,510 --> 01:09:51,100
>> Hivyo yote anafanya, kama sisi tu
tuangalie hatua kwa hatua,

1526
01:09:51,100 --> 01:09:55,870
./generate, hiyo ina maana mimi nina
kuendesha programu yangu kuzalisha.

1527
01:09:55,870 --> 01:09:58,850
Hiyo ni kuchukua katika 1000 katika mchango wake.

1528
01:09:58,850 --> 01:10:03,330
Hivyo nataka kuzalisha 1,000 random
idadi na mimi nina kwenda kwa bomba that--

1529
01:10:03,330 --> 01:10:07,790
au mimi nina kwenda kutumia pato that--
kama pembejeo kwa mpango wangu aitwaye kupata.

1530
01:10:07,790 --> 01:10:12,110
Na mimi nina kwenda kujaribu kupata 42 nje ya
idadi yanayotokana na wale 1,000

1531
01:10:12,110 --> 01:10:13,130
namba.

1532
01:10:13,130 --> 01:10:15,410
Je, kuwa mstari wa kanuni hufanya
maana kila mtu mwingine?

1533
01:10:15,410 --> 01:10:17,820
>> Hivyo kwa njia hii sisi ni kuokoa
sisi wenyewe tani ya hatua.

1534
01:10:17,820 --> 01:10:21,880
Hatuna kuendesha kuzalisha, ila
faili na kisha kuiweka katika kupata.

1535
01:10:21,880 --> 01:10:23,800
Tunaweza tu kufanya hivyo wote katika mstari mmoja.

1536
01:10:23,800 --> 01:10:28,080
Kwa hiyo chochote kuzalisha ni outputting,
plop ni haki ya nyuma katika kupata.

1537
01:10:28,080 --> 01:10:28,580
Yeah?

1538
01:10:28,580 --> 01:10:32,484
>> Watazamaji: Na katika suala la amri
hoja mstari, ni that-- hiyo ni

1539
01:10:32,484 --> 01:10:33,948
tatu hoja mstari amri?

1540
01:10:33,948 --> 01:10:38,340
Ni kuzalisha, find-- hapana, four--
kuzalisha, 1000, kutafuta na 42?

1541
01:10:38,340 --> 01:10:39,134
Au ni the--

1542
01:10:39,134 --> 01:10:42,050
ANDI PENG: Kwa hiyo bomba kweli haina
kuhesabu kama hoja mstari amri

1543
01:10:42,050 --> 01:10:44,590
kwa sababu compiler au
wastaafu anajua kwamba filimbi,

1544
01:10:44,590 --> 01:10:48,590
loo, najua kwamba lazima kuangalia kabla
bomba kwa sababu hiyo ni pato langu

1545
01:10:48,590 --> 01:10:51,220
na ni lazima kuwatunza
bomba kwa sababu hiyo ni pembejeo yangu.

1546
01:10:51,220 --> 01:10:54,520
Hivyo anajua that--
./generate na 1000,

1547
01:10:54,520 --> 01:10:57,390
wale ni wawili amri kisha hoja
tu kwa ajili ya mpango wa kwanza.

1548
01:10:57,390 --> 01:11:01,760
Na kisha ./find 42 ni amri mbili
hoja mstari kwa ajili ya mpango wa pili.

1549
01:11:01,760 --> 01:11:02,980
Naam.

1550
01:11:02,980 --> 01:11:06,150
Kila mtu mzuri juu ya hili?

1551
01:11:06,150 --> 01:11:10,610
>> Hivyo tu halisi haraka, je,
mistari hii mitatu ya maadili ya nini?

1552
01:11:10,610 --> 01:11:11,606
Haki rahisi.

1553
01:11:11,606 --> 01:11:13,605
Mtu yeyote wanataka kuniambia
nini mstari wa kwanza anafanya?

1554
01:11:13,605 --> 01:11:18,201

1555
01:11:18,201 --> 01:11:19,117
Watazamaji: [inaudible].

1556
01:11:19,117 --> 01:11:23,540

1557
01:11:23,540 --> 01:11:26,534
>> ANDI PENG: Fikiria kama just--
nini zaidi kuliko karoti kufanya?

1558
01:11:26,534 --> 01:11:29,299
>> Watazamaji: Ni unaweka kitu
ndani ya mstari wa pili.

1559
01:11:29,299 --> 01:11:31,090
ANDI PENG: Kwa hiyo kile ni
kinyume cha hayo?

1560
01:11:31,090 --> 01:11:33,514
Watazamaji: Ni unaweka ijayo
Jambo katika jambo la kwanza.

1561
01:11:33,514 --> 01:11:34,180
ANDI PENG: Naam.

1562
01:11:34,180 --> 01:11:37,550
Hivyo yote anafanya ni uko
kuendesha programu .hello--

1563
01:11:37,550 --> 01:11:40,010
wewe ni mbio mpango aitwaye hodi.

1564
01:11:40,010 --> 01:11:42,960
Wewe ni kwenda kuwapa
pembejeo aitwaye input.txt.

1565
01:11:42,960 --> 01:11:43,460
Sawa?

1566
01:11:43,460 --> 01:11:46,250
Kwa sababu kufikiria kama tu
kimwili kwenda katika hodi.

1567
01:11:46,250 --> 01:11:50,632
Na kisha wewe ni kwenda kuokoa
pato katika faili inayoitwa output.txt.

1568
01:11:50,632 --> 01:11:51,715
Vipi kuhusu mstari wa pili?

1569
01:11:51,715 --> 01:11:54,164
Unataka kuniambia nini
mstari wa pili gani?

1570
01:11:54,164 --> 01:11:55,080
Watazamaji: [inaudible].

1571
01:11:55,080 --> 01:12:00,522

1572
01:12:00,522 --> 01:12:01,230
ANDI PENG: Sorry.

1573
01:12:01,230 --> 01:12:03,560
Kusema kwamba tena.

1574
01:12:03,560 --> 01:12:04,060
Elliot.

1575
01:12:04,060 --> 01:12:06,560
>> Watazamaji: Hivyo unaweka
orodha ya namba katika kupata.

1576
01:12:06,560 --> 01:12:07,540
>> ANDI PENG: Naam.

1577
01:12:07,540 --> 01:12:10,790
Hivyo kupata, kumbuka, katika
Ili kuendesha kupata

1578
01:12:10,790 --> 01:12:13,209
haja ya kujua ambapo wewe ni kutafuta.

1579
01:12:13,209 --> 01:12:15,500
Na hivyo kila kitu ni kufanya
hapa ni kwamba ni kuwapa ninyi

1580
01:12:15,500 --> 01:12:18,720
kabla kupewa seti ya
idadi, kisha kupata ni kwenda

1581
01:12:18,720 --> 01:12:21,680
kutafuta wale kwa idadi ya 42.

1582
01:12:21,680 --> 01:12:23,620
Na kisha 15.

1583
01:12:23,620 --> 01:12:25,870
Kumbuka, nyie mbio huu
wakati kupimwa kanuni yako.

1584
01:12:25,870 --> 01:12:27,590
Sasa je, kuelewa nini alikuwa akifanya?

1585
01:12:27,590 --> 01:12:31,069

1586
01:12:31,069 --> 01:12:33,520
>> Watazamaji: Ni kuweka katika
seti ya maelekezo

1587
01:12:33,520 --> 01:12:38,860
kwa [inaudible] kwa njia ya tatu na
tatu kupata the-- kushinda mchezo.

1588
01:12:38,860 --> 01:12:39,560
>> ANDI PENG: Naam.

1589
01:12:39,560 --> 01:12:41,480
>> Watazamaji: Ni pembejeo wale
maelekezo katika mpango.

1590
01:12:41,480 --> 01:12:42,438
>> ANDI PENG: Pretty sana.

1591
01:12:42,438 --> 01:12:47,840
Hivyo CS50 tilde. / Pset3 / 3x3, wote
alikuwa akifanya ni kwamba sisi aliumba asilia

1592
01:12:47,840 --> 01:12:50,700
faili kwamba walikuwa wote
vyeo tayari kwa nyie.

1593
01:12:50,700 --> 01:12:56,020
Na hivyo kwa mchezo wako kucheza, wewe just--
sisi tu ya kuweka kwamba katika mpango wako.

1594
01:12:56,020 --> 01:12:58,230
Hivyo tulikuwa na umba hii
ubao na kisha sisi ni

1595
01:12:58,230 --> 01:13:02,890
kuweka bodi kwamba katika mpango wako
kwamba mbio ni na kuundwa tile ya tatu

1596
01:13:02,890 --> 01:13:03,390
na tatu.

1597
01:13:03,390 --> 01:13:04,730
Hayo ni yote kwamba alikuwa akifanya.

1598
01:13:04,730 --> 01:13:07,331
>> Na hivyo kulikuwa na kweli uchawi
kinachoendelea nyuma ya pazia

1599
01:13:07,331 --> 01:13:09,330
kwamba nyie hakuwa
Mpango kwamba sisi iliyowekwa.

1600
01:13:09,330 --> 01:13:13,120
Lakini sasa nyie kuelewa kwa nini
sisi alifanya hivyo hivyo ni yote mema.

1601
01:13:13,120 --> 01:13:15,750
Sawa.

1602
01:13:15,750 --> 01:13:22,200
>> Hivyo wakati redirection ni sana
muhimu, C ina utaratibu ujumla

1603
01:13:22,200 --> 01:13:25,030
kwa kusoma na kuandika
mafaili ya peke yake.

1604
01:13:25,030 --> 01:13:26,780
Hakuna kitu conceptually
ngumu hapa hivyo mimi nina

1605
01:13:26,780 --> 01:13:28,330
tu kwenda kupitia
kweli, kweli haraka.

1606
01:13:28,330 --> 01:13:30,621
Wote ni baadhi ya kukariri
na kuhakikisha nyie

1607
01:13:30,621 --> 01:13:32,680
ni syntactically kutumia kwa usahihi.

1608
01:13:32,680 --> 01:13:35,640
Njia ambayo tunatarajia kufanya hivyo ni
kujenga kumbukumbu ya faili,

1609
01:13:35,640 --> 01:13:38,473
tunatarajia kufungua faili, na kisha sisi
atafanya zote kusoma na kuandika

1610
01:13:38,473 --> 01:13:39,929
na kisha kufunga faili.

1611
01:13:39,929 --> 01:13:41,720
Wakati kitu nyie
wanataka kukumbuka ni

1612
01:13:41,720 --> 01:13:47,360
kwamba wakati akifanya hivyo, kwa sababu
sisi ni kufunga na kufungua faili,

1613
01:13:47,360 --> 01:13:51,230
amri zote za wale ni pamoja na
katika standard-- kiwango I / O

1614
01:13:51,230 --> 01:13:51,730
maktaba.

1615
01:13:51,730 --> 01:13:54,410
Ili kuhakikisha wakati wowote uko
kufanya hivyo kwa kuwa umefanya included--

1616
01:13:54,410 --> 01:13:59,020
# included-- kiwango I / O nukta h.

1617
01:13:59,020 --> 01:14:01,691
>> Hivyo halisi haraka.

1618
01:14:01,691 --> 01:14:03,940
Hatua moja, unataka kujenga
kumbukumbu ya faili hilo.

1619
01:14:03,940 --> 01:14:07,670
Na sasa kwamba tumekuwa kuyatumia done, wewe
guys unaweza kuniambia nini kuwa mstari wa kanuni

1620
01:14:07,670 --> 01:14:08,630
ni kufanya.

1621
01:14:08,630 --> 01:14:10,250
Sawa?

1622
01:14:10,250 --> 01:14:15,397
Yote ni kufanya ni kujenga
pointer aitwaye faili la aina ya faili.

1623
01:14:15,397 --> 01:14:17,980
Kwa sababu unajua kwamba ni kwenda
kwa uhakika na faili na uko

1624
01:14:17,980 --> 01:14:20,460
kwenda kufungua faili.

1625
01:14:20,460 --> 01:14:23,320
Basi uko f open-- zote
haina ni kufungua faili.

1626
01:14:23,320 --> 01:14:24,560
>> Hii ni jina la faili.

1627
01:14:24,560 --> 01:14:26,060
Na kuna mambo matatu unaweza kufanya.

1628
01:14:26,060 --> 01:14:28,195
Unaweza kusoma, kuandika au append.

1629
01:14:28,195 --> 01:14:30,320
Wengi kwa ujumla, nyie
Itakuwa kusoma au kuandika

1630
01:14:30,320 --> 01:14:33,195
kwa sababu wewe ni ama kwenda kuwa
inputting faili au outputting moja.

1631
01:14:33,195 --> 01:14:36,500
R hivyo pretty much na w mambo mawili
mambo wewe ni kwenda kuwa na kutumia zaidi.

1632
01:14:36,500 --> 01:14:41,722
>> Hivyo katika kesi hii, kila nafanya ni
kujenga pointer faili inayoitwa faili.

1633
01:14:41,722 --> 01:14:47,900
Mimi kufungua na mimi nina reading-- mimi nina
kufungua faili hii inaitwa file.txt

1634
01:14:47,900 --> 01:14:49,020
na mimi nina kusoma hiyo.

1635
01:14:49,020 --> 01:14:51,730
Hayo ni yote mimi nina kufanya katika hatua hii.

1636
01:14:51,730 --> 01:14:55,270
Na kisha hizi ni baadhi tu ya kazi zake katika
ambayo unaweza kusoma mambo mbalimbali

1637
01:14:55,270 --> 01:14:57,750
au kuandika mambo mbalimbali
au kutofika kwa maeneo mbalimbali

1638
01:14:57,750 --> 01:14:59,420
ambapo unataka kuangalia.

1639
01:14:59,420 --> 01:15:01,200
Zote hizi ni online.

1640
01:15:01,200 --> 01:15:02,960
Yote haya unaweza tu Google.

1641
01:15:02,960 --> 01:15:04,280
Hakuna haja ya kukariri yao.

1642
01:15:04,280 --> 01:15:07,160
Wao ni tu pale,
ziada kwa ajili ya matumizi yako

1643
01:15:07,160 --> 01:15:09,360
kama ungependa
kuwa na uwezo wa kuzitumia.

1644
01:15:09,360 --> 01:15:13,210
>> Hivyo kama nilitaka kusoma tu
katika tabia moja kwa wakati mmoja,

1645
01:15:13,210 --> 01:15:15,360
Napenda kufanya faili fgetc.

1646
01:15:15,360 --> 01:15:18,850
Au kama nilitaka kusoma katika mstari wa
Nakala wakati huo, napenda kufanya fgets.

1647
01:15:18,850 --> 01:15:19,840
Na kadhalika na kadhalika.

1648
01:15:19,840 --> 01:15:23,640
Yote haya tu kufanya tofauti
mambo nyie unaweza kutumia.

1649
01:15:23,640 --> 01:15:25,920
>> Na kisha mwisho, baada ya mimi nina
kosa kusoma au kuandika,

1650
01:15:25,920 --> 01:15:27,770
Mimi tu kwenda kwa fclose faili hilo.

1651
01:15:27,770 --> 01:15:31,760
Na kumbuka, hii ni moja
ya wale, kumbuka, tafadhali

1652
01:15:31,760 --> 01:15:34,220
kufanya hivyo au mwingine faili yako
si kwenda kufanya kazi.

1653
01:15:34,220 --> 01:15:36,130
Daima kufungua faili kabla
kusoma au kusoma,

1654
01:15:36,130 --> 01:15:38,310
una daima
kulifunga kama wewe kuufungua.

1655
01:15:38,310 --> 01:15:40,210
Same kitu na kumbukumbu, sawa?

1656
01:15:40,210 --> 01:15:42,390
Una daima kuchukua
kumbukumbu na bure yake.

1657
01:15:42,390 --> 01:15:45,200
Hapa una daima kufungua
faili kabla ya kujaribu kusoma

1658
01:15:45,200 --> 01:15:47,360
na wewe daima kuwa na
kulifunga baada kuufungua.

1659
01:15:47,360 --> 01:15:50,650

1660
01:15:50,650 --> 01:15:52,190
>> Hivyo hii ni pia online.

1661
01:15:52,190 --> 01:15:55,590
Mimi nina kwenda changamoto nyie
aina ya kuandika mpango kwamba Prints

1662
01:15:55,590 --> 01:15:57,080
hello.world na faili.

1663
01:15:57,080 --> 01:15:58,280
Ni kweli ni rahisi.

1664
01:15:58,280 --> 01:16:00,854
Ni kimsingi inahusisha tu
mistari michache ya kificho

1665
01:16:00,854 --> 01:16:02,270
kwamba walikuwa tu imeandikwa hapo awali.

1666
01:16:02,270 --> 01:16:04,311
Wewe ni kwenda kuziweka
pamoja na kuandika kwamba.

1667
01:16:04,311 --> 01:16:06,630

1668
01:16:06,630 --> 01:16:10,950
>> Hivyo baadhi ya mambo muhimu kukumbuka
wakati nyie ni kujaribu kutumia hii.

1669
01:16:10,950 --> 01:16:14,410
Kama hii yote ni muhimu sana
kwa pset yako wiki hii,

1670
01:16:14,410 --> 01:16:18,000
ni kwamba fopen inajenga faili pointer.

1671
01:16:18,000 --> 01:16:19,500
Siyo kweli ya faili kimwili.

1672
01:16:19,500 --> 01:16:22,260
Wote ni akizungumzia
faili unataka kufungua.

1673
01:16:22,260 --> 01:16:26,070
Na wewe ni kimsingi, wakati wowote
unatumia yoyote ya kazi nyingine

1674
01:16:26,070 --> 01:16:30,130
kama fread au fwrite
au fgetc au fgets, ni

1675
01:16:30,130 --> 01:16:33,380
kwamba wewe ni kupita tu kuzunguka huu
pointer kwa wote wa kazi hizo.

1676
01:16:33,380 --> 01:16:36,510
Hivyo wewe si kweli kuchukua kwamba
faili na kutumia kwa ajili ya kazi yako,

1677
01:16:36,510 --> 01:16:39,540
wewe ni kuchukua tu pointer
na kuweka kwa kazi hizo

1678
01:16:39,540 --> 01:16:41,620
ili uweze kutumia.

1679
01:16:41,620 --> 01:16:45,360
>> Na kama wewe kusahau kwa karibu
faili yako baada ya matumizi yake,

1680
01:16:45,360 --> 01:16:47,710
Mpango wako ni kwenda kuvuja kumbukumbu.

1681
01:16:47,710 --> 01:16:50,700
Kimsingi, njia kwamba wote
ni kwamba mambo mabaya yatatokea

1682
01:16:50,700 --> 01:16:52,960
na mpango wako mapenzi
si kazi ipasavyo.

1683
01:16:52,960 --> 01:16:54,880
Na kadhalika pset katika
mwanzo, nadhani

1684
01:16:54,880 --> 01:16:59,180
kuna short ambako explained--
Nate explained-- nini Valgrind alikuwa.

1685
01:16:59,180 --> 01:17:02,350
Wote Valgrind ni njia kwa ajili ya wewe
kuhakikisha wewe si kuvuja kumbukumbu.

1686
01:17:02,350 --> 01:17:04,433
Hivyo nyie wanataka kufanya
kuhakikisha kuangalia kwamba fupi

1687
01:17:04,433 --> 01:17:08,771
kwa sababu kwamba anaelezea ni
vizuri nini kinatokea.

1688
01:17:08,771 --> 01:17:09,270
SAWA.

1689
01:17:09,270 --> 01:17:11,260
Basi, mimi nikaenda kupitia kwamba kweli,
kweli haraka kwa sababu mimi kwa kweli

1690
01:17:11,260 --> 01:17:13,870
wanataka kupata kuzungumza juu
pset kabla nyie kuondoka.

1691
01:17:13,870 --> 01:17:16,690
Je, mtu yeyote una maswali conceptually?

1692
01:17:16,690 --> 01:17:20,060
Wengi wao wakiwa yote haya ni syntax tu kwamba
unaweza kutumia kusoma wala kuandika mafaili.

1693
01:17:20,060 --> 01:17:25,090

1694
01:17:25,090 --> 01:17:28,140
>> Hatimaye, favorite ya kila mtu.

1695
01:17:28,140 --> 01:17:31,760
Tunakwenda kuzungumzia pset sasa.

1696
01:17:31,760 --> 01:17:35,990
Hivyo, show ya mikono, ni wangapi kati
nyie kusoma spec wiki hii?

1697
01:17:35,990 --> 01:17:36,660
Oh, hiyo ni nusu.

1698
01:17:36,660 --> 01:17:38,000
Hiyo ni nzuri.

1699
01:17:38,000 --> 01:17:41,430
Hivyo hii ni kweli kweli,
kweli na furaha pset kwa maana ya

1700
01:17:41,430 --> 01:17:43,889
kwamba wewe kujisikia kama
upelelezi kwa sababu wewe ni

1701
01:17:43,889 --> 01:17:46,930
kufanya haya mambo ya kweli ya baridi zote
kuwa sikujua kwamba unaweza kufanya

1702
01:17:46,930 --> 01:17:49,050
lakini sasa ni kweli baridi
ambayo unaweza kufanya nao.

1703
01:17:49,050 --> 01:17:52,400
Na ni kweli mengi
rahisi kuliko nyie kufikiri.

1704
01:17:52,400 --> 01:17:56,640
>> Hivyo nusu ya msingi ya
mpango huu ni uko

1705
01:17:56,640 --> 01:18:00,330
kwenda kushusha chanzo kanuni au
usambazaji sheria iliyoandikwa na sisi.

1706
01:18:00,330 --> 01:18:03,540
Na wewe ni kwenda na folder moja
aitwaye BMP na folder mwingine

1707
01:18:03,540 --> 01:18:05,550
aitwaye JPG.

1708
01:18:05,550 --> 01:18:08,370
Ndani ya BMP yako, wewe ni
kwenda na mipango ya tatu.

1709
01:18:08,370 --> 01:18:10,400
Mmoja wao ni tayari imeandikwa kwa ajili yenu.

1710
01:18:10,400 --> 01:18:12,477
Hivyo copy.c ni mpango
tumekuwa tayari imeandikwa

1711
01:18:12,477 --> 01:18:14,060
kwa kuwa wewe ni kwenda kupakua.

1712
01:18:14,060 --> 01:18:19,440
Wote kwamba hana ni kuchukua kama pembejeo picha
na hufanya nakala yake kama pato.

1713
01:18:19,440 --> 01:18:22,150
Hiyo ni faili kwamba wote ni kufanya.

1714
01:18:22,150 --> 01:18:25,260
>> Lakini nini unataka kufanya kwa
whodunit-- hivyo jinsi wengi wenu

1715
01:18:25,260 --> 01:18:30,450
guys kumbuka katika darasa la tano au maybe--
wewe ni younger-- daraja labda tatu,

1716
01:18:30,450 --> 01:18:33,945
wakati nyie alikuwa ujumbe siri na
alikuwa na kuweka kipande cha karatasi juu yake

1717
01:18:33,945 --> 01:18:35,440
kusimbua ujumbe?

1718
01:18:35,440 --> 01:18:36,000
Yeah?

1719
01:18:36,000 --> 01:18:39,580
Hivyo kwamba wote sisi ni kufanya
isipokuwa wakati huu kwa kompyuta.

1720
01:18:39,580 --> 01:18:41,832
Hivyo tumekuwa kupeni picha hii nzuri.

1721
01:18:41,832 --> 01:18:43,540
Haina kuangalia kama
chochote lakini chini

1722
01:18:43,540 --> 01:18:49,660
ni fununu kwamba itakuja kusaidia
kwa kujibu swali tunakuomba.

1723
01:18:49,660 --> 01:18:54,170
>> Kimsingi nini unataka
kufanya ni pembejeo kwamba faili,

1724
01:18:54,170 --> 01:18:56,610
tweak baadhi ya mambo kote,
labda kurekebisha rangi,

1725
01:18:56,610 --> 01:19:00,730
kuhama mambo, ili lo lote
Ujumbe ni wanaweza kuja kwa njia ya.

1726
01:19:00,730 --> 01:19:03,740
Hivyo ndani ya huko ni siri
saizi na taarifa

1727
01:19:03,740 --> 01:19:07,140
kwamba kama wewe kuandika kanuni yako kwa usahihi
kinaenda Decode na kukuambia

1728
01:19:07,140 --> 01:19:08,500
nini fununu hii ni.

1729
01:19:08,500 --> 01:19:12,480
Na baadhi hivyo mwanga msaada wa jinsi
d kwenda juu inakaribia hii.

1730
01:19:12,480 --> 01:19:15,180
>> Kweli unataka familiarize
mwenyewe na faili I / O

1731
01:19:15,180 --> 01:19:18,760
kwa sababu sisi ni kusoma kutoka
mafaili na kuandika kwa files.

1732
01:19:18,760 --> 01:19:19,260
Sawa?

1733
01:19:19,260 --> 01:19:21,430
Na hivyo wakati sisi kufanya
kwamba, ambayo inahusisha

1734
01:19:21,430 --> 01:19:25,170
faili I / O. Wewe ni kwenda
na familiarize mwenyewe

1735
01:19:25,170 --> 01:19:27,450
pamoja, jinsi gani unaweza kufungua files picha?

1736
01:19:27,450 --> 01:19:29,960
Jinsi gani unaweza kuandika kwa files kama picha?

1737
01:19:29,960 --> 01:19:31,640
Jinsi gani unaweza kufanya mambo yote hayo?

1738
01:19:31,640 --> 01:19:33,660
Hiyo inaenda kuwa na manufaa kwa kweli.

1739
01:19:33,660 --> 01:19:36,190
>> Pili, una hali gani
kwenda kuwa na uwezo wa kubadilisha

1740
01:19:36,190 --> 01:19:38,140
rangi ya kwamba wazi juu ya picha hii?

1741
01:19:38,140 --> 01:19:43,660
Ni pengine kwenda kuhusisha
kurekebisha saizi yako au maadili yako RGB

1742
01:19:43,660 --> 01:19:45,390
mahali fulani huko, kimsingi.

1743
01:19:45,390 --> 01:19:47,800
Hakuna njia ya haki
kutatua hii kwa muda mrefu kama wewe

1744
01:19:47,800 --> 01:19:52,560
can-- kama muda mrefu kama unaweza aina ya
kurekebisha saizi wale ili iwe

1745
01:19:52,560 --> 01:19:54,640
kuangalia kama kitu ambacho unaowajali.

1746
01:19:54,640 --> 01:19:56,207
Hayo ni yote sisi huduma ya juu pia.

1747
01:19:56,207 --> 01:19:57,540
Hivyo kuna njia nyingi za kufanya hivyo.

1748
01:19:57,540 --> 01:20:00,039
Tu kucheza karibu na hayo mpaka
kupata kitu ambacho kazi.

1749
01:20:00,039 --> 01:20:02,900
Na wewe itakuwa kweli
kushangaa mistari michache ya kificho jinsi

1750
01:20:02,900 --> 01:20:04,510
unahitaji kwa kweli kufanya hili.

1751
01:20:04,510 --> 01:20:08,700
Mimi kuzungumza kama tatu
mstari wa kanuni jumla

1752
01:20:08,700 --> 01:20:11,310
kwamba unahitaji kuandika
ili kufanya hivyo.

1753
01:20:11,310 --> 01:20:15,470
Hivyo kama wewe mwenyewe kupata
kuandika 40, mistari 30 ya kificho,

1754
01:20:15,470 --> 01:20:16,960
pengine wewe kufanya hivyo vibaya.

1755
01:20:16,960 --> 01:20:19,390
Wote una kufanya ni aina ya
kucheza karibu na rangi

1756
01:20:19,390 --> 01:20:22,960
na kuona ni jinsi kwamba kazi nje.

1757
01:20:22,960 --> 01:20:27,040
>> Hivyo basi sisi kichwa katika kidogo
kwa bidii ya tatizo.

1758
01:20:27,040 --> 01:20:30,190
Hapa tuna resize
ambapo sisi ni kuuliza wewe

1759
01:20:30,190 --> 01:20:34,210
to-- sisi ni kutoa kama mchango
picha na resizing yako

1760
01:20:34,210 --> 01:20:36,710
picha hii katika kitu
kubwa au kitu kidogo

1761
01:20:36,710 --> 01:20:38,500
kutegemea vipimo sisi kukupa.

1762
01:20:38,500 --> 01:20:41,260
Basi kumbuka katika hotuba
Daudi haraka

1763
01:20:41,260 --> 01:20:45,780
akapiga juu jinsi habari
ni wanaona na kompyuta yako

1764
01:20:45,780 --> 01:20:47,590
kwa maana ni aina ya faili.

1765
01:20:47,590 --> 01:20:50,530
Hivyo faili Neno ina maalum
wahusika mbele ya kwamba

1766
01:20:50,530 --> 01:20:52,040
kuwaambia kompyuta yako ni faili Neno.

1767
01:20:52,040 --> 01:20:53,090
Same kitu na JPEG.

1768
01:20:53,090 --> 01:20:55,131
Katika kesi hiyo tunakwenda
kukupa JPEG faili.

1769
01:20:55,131 --> 01:20:58,300
Tunachojua ni kwamba JPEG
faili ni picha, sawa?

1770
01:20:58,300 --> 01:21:01,430
Lakini tofauti kati ya kompyuta
hivyo kwa njia maalum sana.

1771
01:21:01,430 --> 01:21:04,070
Hivyo mwanzoni mwa
faili yoyote JPEG, uko

1772
01:21:04,070 --> 01:21:08,210
kwenda na kile kinachoitwa bitmap
Maelezo kichwa na bitmap faili header.

1773
01:21:08,210 --> 01:21:11,080
Wote wale ni watu
vipande mbalimbali ya data

1774
01:21:11,080 --> 01:21:14,870
kwamba kuwaambia kompyuta yako, hey,
kusikiliza up, JPEGs kuja juu

1775
01:21:14,870 --> 01:21:17,820
na hizi ni vipimo au
tabia ya kuwa JPEG.

1776
01:21:17,820 --> 01:21:21,280
>> Hivyo nyie kweli unataka kujua
nini habari ni kuhifadhiwa ndani ya

1777
01:21:21,280 --> 01:21:23,560
ya vichwa vya wale na
kile ni kawaida miongoni mwao.

1778
01:21:23,560 --> 01:21:25,640
Kwa sababu wakati wewe ni mbio
kupitia mpango wako,

1779
01:21:25,640 --> 01:21:27,370
wewe ni kwenda kutaka
ruka juu ya kiwango hicho.

1780
01:21:27,370 --> 01:21:27,940
Sawa?

1781
01:21:27,940 --> 01:21:29,910
Kwa sababu huna huduma
kuhusu kubadilisha kichwa,

1782
01:21:29,910 --> 01:21:31,493
unaowajali kubadilisha nini baada.

1783
01:21:31,493 --> 01:21:32,450
Sawa?

1784
01:21:32,450 --> 01:21:36,040
Ili kuhakikisha guys kujua
jinsi kubwa mambo hayo ni.

1785
01:21:36,040 --> 01:21:39,065
>> Pili, kabla ya kuanza
kujaribu resize picha yako,

1786
01:21:39,065 --> 01:21:41,940
pengine wewe kwenda kutaka
kuokoa vipimo ya awali.

1787
01:21:41,940 --> 01:21:42,520
Sawa?

1788
01:21:42,520 --> 01:21:45,550
Kwa sababu kama mimi nawaambia picha hii
ni 100 saizi na 100, saizi

1789
01:21:45,550 --> 01:21:47,630
na mimi nataka kufanya
ni mara nne kubwa,

1790
01:21:47,630 --> 01:21:50,460
unajua kwamba una
kuzidisha vipimo wale na watu wanne.

1791
01:21:50,460 --> 01:21:54,960
Hivyo basi unataka pato faili
400 na 400 saizi, kwa mfano.

1792
01:21:54,960 --> 01:21:58,300
Hivyo ni muhimu kweli kweli kwa nyie kwa
kuokoa vipimo ya awali.

1793
01:21:58,300 --> 01:22:00,780
Na kisha baada ya hapo, baada ya
wewe ni kosa resizing,

1794
01:22:00,780 --> 01:22:06,270
unaweza kuandika vichwa vya mpya na
vipimo wale mpya baada ya resizing.

1795
01:22:06,270 --> 01:22:10,750
>> Na kwa njia hiyo wewe kimwili
Unaweza kuunda katika saizi kubwa

1796
01:22:10,750 --> 01:22:13,380
ni kwamba unaweza kuandika
mpya RGB-- kumbuka, RGB,

1797
01:22:13,380 --> 01:22:17,784
yote anasimama kwa ni nyekundu, kijani,
na saizi blue-- na faili nje.

1798
01:22:17,784 --> 01:22:20,200
Na wewe ni kwenda kutaka
na kiasi tofauti ya yale

1799
01:22:20,200 --> 01:22:21,200
tunatoa wito padding.

1800
01:22:21,200 --> 01:22:24,780
Padding ipo zote ni nafasi
kabla na baada ya picha

1801
01:22:24,780 --> 01:22:29,265
kwamba kuwaambia your-- kimsingi kwamba
kuwaambia picha yako jinsi kubwa ni

1802
01:22:29,265 --> 01:22:30,589
lazima kuwa na kuchukua up.

1803
01:22:30,589 --> 01:22:33,630
Hii ni abstract sana kwa mengi ya
wewe kama wewe si kusoma spec pset,

1804
01:22:33,630 --> 01:22:35,410
lakini itakuja kuwa
muhimu sana kwa wakati

1805
01:22:35,410 --> 01:22:36,460
wewe ni kweli kusoma kwa njia hiyo.

1806
01:22:36,460 --> 01:22:38,126
Wewe ni kama, loo, yeah, kwamba inafanya hisia.

1807
01:22:38,126 --> 01:22:39,310
Kwa nini mimi kufanya hili?

1808
01:22:39,310 --> 01:22:41,830
Hufanya akili.

1809
01:22:41,830 --> 01:22:46,900
>> Mwisho, hii pengine ni moja ya
programu nyingi frustrating

1810
01:22:46,900 --> 01:22:51,160
milele kwa sababu tu huwezi
kuwaambia kama ni kazi au la.

1811
01:22:51,160 --> 01:22:54,980
Mpango huu wote, kupona, ni
kufanya ni kwamba, kama kuendesha vizuri,

1812
01:22:54,980 --> 01:22:59,290
ni lazima kuwa na uwezo wa ghafla
kuokoa 50 picha kwamba

1813
01:22:59,290 --> 01:23:01,025
walikuwa wamepoteza kwenye gari kwa bidii.

1814
01:23:01,025 --> 01:23:03,900
Na hivyo tatizo na mpango huu
ni kwamba unaweza si kweli mtihani

1815
01:23:03,900 --> 01:23:06,220
kwa sababu ama wewe zinalipwa
nao au wewe hakufanya hivyo.

1816
01:23:06,220 --> 01:23:09,122
Na hivyo aina ya tu
una kucheza karibu na hayo,

1817
01:23:09,122 --> 01:23:11,080
na kama mpango wako ni
kazi vizuri, itabidi

1818
01:23:11,080 --> 01:23:12,829
ghafla kuona kwamba katika
saraka yako wameweza

1819
01:23:12,829 --> 01:23:17,400
got kiasi kubwa ya
picha kwamba ni sasa huko.

1820
01:23:17,400 --> 01:23:20,490
>> Hivyo ni jinsi gani mbinu mimi
tatizo hili ni, tuko

1821
01:23:20,490 --> 01:23:22,860
kwenda kukupa nini
aitwaye faili card.raw.

1822
01:23:22,860 --> 01:23:25,020
Kimsingi, hiyo ni
tu faili kupotoshwa

1823
01:23:25,020 --> 01:23:28,870
kwa picha zote kuhifadhiwa kwamba
wewe ni kwenda haja ya kupona kutokana na.

1824
01:23:28,870 --> 01:23:32,330
Hivyo pengine wewe kwenda kutaka
pembejeo card.raw yako, au wazi,

1825
01:23:32,330 --> 01:23:35,510
card.raw faili yako na wewe ni
atataka kuendesha

1826
01:23:35,510 --> 01:23:37,840
kuwa ni uwezo wa kuhifadhi JPEGs.

1827
01:23:37,840 --> 01:23:42,830
>> Hivyo napenda kuanza kwa kufuatilia na kuhifadhi
kila JPEG mtu binafsi kama wewe kupata hiyo.

1828
01:23:42,830 --> 01:23:47,180
Wewe si kwenda kwa mtu mmoja mmoja yote
Kwa ghafla tu kujenga JPEGs yote 50.

1829
01:23:47,180 --> 01:23:50,190
Wewe ni kwenda unataka kuweka
wimbo wa jinsi wengi wewe ni kufungua.

1830
01:23:50,190 --> 01:23:52,015
Na kisha unataka
kuhakikisha, wakati uko

1831
01:23:52,015 --> 01:23:54,640
kuandika buffer-- nyie
kujua nini mimi kuzungumza juu

1832
01:23:54,640 --> 01:23:57,806
mara moja kusoma spec-- unataka
kuhakikisha kwamba unatumia unsigned

1833
01:23:57,806 --> 01:23:59,370
char buffer.

1834
01:23:59,370 --> 01:24:01,790
>> Na kisha unataka kuuliza
mwenyewe swali la,

1835
01:24:01,790 --> 01:24:05,797
jinsi wengi ka ni katika
CF-- ni katika kadi faili?

1836
01:24:05,797 --> 01:24:08,380
Hiyo ni wangapi wewe ni kwenda
unataka kusoma katika buffer yako.

1837
01:24:08,380 --> 01:24:11,130
Wewe ni kwenda unataka kuhakikisha
align mbili kwa sababu basi

1838
01:24:11,130 --> 01:24:12,850
Huwezi kuwa random kumbukumbu kuvuja nje.

1839
01:24:12,850 --> 01:24:15,370
Kujua hasa ni wangapi
ka unahitaji na jinsi wengi

1840
01:24:15,370 --> 01:24:18,270
ka kwamba unataka yao kuwa nayo.

1841
01:24:18,270 --> 01:24:21,510
>> Na kisha hatimaye, unataka
kutumia kazi kuitwa sprint--

1842
01:24:21,510 --> 01:24:26,160
s magazeti f-- kuzalisha faili desturi
majina kwa kila JPEG mpya kwamba kupata.

1843
01:24:26,160 --> 01:24:29,129
Hivyo kama wewe kujenga na
kupata JPEGs katika kadi yako,

1844
01:24:29,129 --> 01:24:31,170
wewe ni kwenda kutaka
kuhifadhi yao na jina yao.

1845
01:24:31,170 --> 01:24:31,700
Sawa?

1846
01:24:31,700 --> 01:24:33,700
Na hivyo wewe ni kwenda
wanataka kutumia kazi ambayo

1847
01:24:33,700 --> 01:24:36,770
kujenga majina
wanaweza kuhifadhi wote wa JPEGs yako.

1848
01:24:36,770 --> 01:24:41,062
>> Na mwisho, usisahau karibu
kila JPEG baada ya wewe ni kosa.

1849
01:24:41,062 --> 01:24:42,770
Kwa sababu gani uko
kwenda kufanya ni uko

1850
01:24:42,770 --> 01:24:44,728
kwenda pengine
aina fulani ya kitanzi kwamba

1851
01:24:44,728 --> 01:24:46,470
iterates kwa njia zote za JPEGs yako.

1852
01:24:46,470 --> 01:24:50,460
Wewe ni kwenda kuandika JPEG
na kubadili jina hilo kama wewe kupata hiyo.

1853
01:24:50,460 --> 01:24:52,870
Lakini baada ya wewe ni kosa
kwa kila JPEG moja,

1854
01:24:52,870 --> 01:24:56,630
unahitaji kuifunga hivyo unaweza kuanza
zaidi na hoja juu ya picha ya pili.

1855
01:24:56,630 --> 01:24:58,880
Na hivyo kitu ambacho ni
kweli na furaha kwamba sisi kama kwa kufanya,

1856
01:24:58,880 --> 01:25:03,430
kwa sababu hili ni tatizo weird kama kuweka
lakini pia tatizo weirdly kuridhisha

1857
01:25:03,430 --> 01:25:08,380
kuweka, ni kwamba wote wa picha sisi
na kwa wewe, kama wewe kupona vizuri,

1858
01:25:08,380 --> 01:25:11,910
picha zote ni picha za
wafanyakazi wako ajabu kufundisha, wote

1859
01:25:11,910 --> 01:25:14,240
ya Harvard, katika here-- na hapa katika Yale.

1860
01:25:14,240 --> 01:25:17,260
Na kama kutokea kwa
kuokoa picha zote hizi

1861
01:25:17,260 --> 01:25:20,020
na kubaini wafanyakazi
wanachama katika kadi hizo,

1862
01:25:20,020 --> 01:25:23,040
na kuchukua selfies na sisi kama
unakuta sisi karibu chuo,

1863
01:25:23,040 --> 01:25:28,270
kwa kila picha wewe kuwasilisha kwetu, tutaweza
kukupa gigabyte ya Dropbox nafasi.

1864
01:25:28,270 --> 01:25:30,060
>> Basi hebu kufanya hesabu hapa.

1865
01:25:30,060 --> 01:25:33,010
Kama kuna picha 50 na
Wanachama 50 wafanyakazi wa kufundisha,

1866
01:25:33,010 --> 01:25:37,160
kama kutokea kwa kupata yote 50 ya
sisi, hiyo ni 50 gigabytes ya Dropbox,

1867
01:25:37,160 --> 01:25:39,000
kimsingi, tutaweza kuwa na kutoa nyie.

1868
01:25:39,000 --> 01:25:42,380
Hivyo baadhi motisha ya ziada aliongeza
kama wewe guys alifanya si tu

1869
01:25:42,380 --> 01:25:44,480
huduma ya juu ya kurejesha waliopotea picha.

1870
01:25:44,480 --> 01:25:46,867
Kuna pia baadhi motisha aliongeza.

1871
01:25:46,867 --> 01:25:47,825
Ni furaha tatizo seti.

1872
01:25:47,825 --> 01:25:48,390
Ni kweli ni.

1873
01:25:48,390 --> 01:25:51,980
Ni aina ya frustrating lakini basi
inakuwa kweli na furaha wakati wewe kutambua,

1874
01:25:51,980 --> 01:25:54,230
wow, ni kazi na sasa mimi
na wote wa picha hizi

1875
01:25:54,230 --> 01:25:55,604
kwamba nimekuwa tu kuundwa kwa mwenyewe.

1876
01:25:55,604 --> 01:25:58,800

1877
01:25:58,800 --> 01:26:00,075
>> Maswali yoyote juu ya pset?

1878
01:26:00,075 --> 01:26:02,408
Kwa mtu yeyote ambaye tayari
kuanza, kama una maswali,

1879
01:26:02,408 --> 01:26:06,510
Nitakuwa hapa kwa dakika kadhaa baada ya
sehemu kama unataka kuzungumza na mimi.

1880
01:26:06,510 --> 01:26:07,320
Vizuri, nyie.

1881
01:26:07,320 --> 01:26:10,520
Samahani, mimi taarifa
kutupwa katika guys wewe.

1882
01:26:10,520 --> 01:26:13,670
Kuyatumia ni kweli, kweli
changamoto na frustrating.

1883
01:26:13,670 --> 01:26:16,187
>> Na mimi nina furaha kweli kwamba
nyie kukaa na mimi.

1884
01:26:16,187 --> 01:26:18,020
Tutaweza majadiliano zaidi katika kina
kuhusu wiki ijayo

1885
01:26:18,020 --> 01:26:21,330
kama sisi kuanza kufanya meza hash na
kazi zaidi ambazo zinahusisha yao.

1886
01:26:21,330 --> 01:26:23,821

1887
01:26:23,821 --> 01:26:24,320
Naam.

1888
01:26:24,320 --> 01:26:26,278
Hivyo kama mtu ana yoyote
maswali, mimi itakuwa kote.

1889
01:26:26,278 --> 01:26:29,330
Shukrani kwa kuja na kuchukua zaidi
pipi kwa sababu kuna pipi zaidi.

1890
01:26:29,330 --> 01:26:32,220

1891
01:26:32,220 --> 01:26:33,770
Baridi.

1892
01:26:33,770 --> 01:26:35,765