1
00:00:00,000 --> 00:00:05,640

2
00:00:05,640 --> 00:00:06,830
>> DOUG LLOYD: zote haki GDB.

3
00:00:06,830 --> 00:00:08,480
Ni kitu gani hasa?

4
00:00:08,480 --> 00:00:11,310
Hivyo GDB, ambayo inasimamia
kwa GNU Debugger,

5
00:00:11,310 --> 00:00:15,040
ni kweli kutisha chombo kwamba tunaweza
kutumia kutusaidia Debug mipango yetu,

6
00:00:15,040 --> 00:00:18,210
au kujua ni wapi mambo ni
kwenda vibaya katika mipango yetu.

7
00:00:18,210 --> 00:00:22,590
GDB ni kushangaza nguvu, lakini
pato na mwingiliano na hayo

8
00:00:22,590 --> 00:00:23,830
inaweza kuwa ni kidogo kidogo cryptic.

9
00:00:23,830 --> 00:00:28,210
Ni kawaida mstari amri chombo, na
inaweza kutupa mengi ya ujumbe saa wewe.

10
00:00:28,210 --> 00:00:31,144
Na inaweza aina ya vigumu
Hazrat nini hasa kinaendelea.

11
00:00:31,144 --> 00:00:33,560
Kwa bahati nzuri, tumekuwa kuchukuliwa hatua
kurekebisha tatizo hili kwa ajili yenu

12
00:00:33,560 --> 00:00:36,281
kama wewe kazi kwa njia CS50.

13
00:00:36,281 --> 00:00:39,030
Kama wewe si kutumia graphical
HatiJava, ambayo mwenzangu Dan

14
00:00:39,030 --> 00:00:41,570
Armandarse amesema kabisa
kidogo kuhusu katika video ambayo

15
00:00:41,570 --> 00:00:44,740
lazima juu hapa
sasa hivi, unaweza haja

16
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kutumia mstari amri hizi
zana kufanya kazi na GDB.

17
00:00:48,270 --> 00:00:51,250
Kama wewe ni kufanya kazi katika CS50
IDE, huna haja ya kufanya hivyo.

18
00:00:51,250 --> 00:00:53,550
Lakini kama wewe si
kufanya kazi katika CS50 IDE,

19
00:00:53,550 --> 00:00:55,750
labda kwa kutumia toleo la
ya Appliance CS50,

20
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au nyingine Linux uendeshaji
mfumo na GDB imewekwa juu yake,

21
00:00:58,860 --> 00:01:00,980
unaweza haja ya kutumia
hizi amri line zana.

22
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>> Na kwa kuwa waweza
kuwa kufanya hivyo, ni

23
00:01:02,860 --> 00:01:06,280
muhimu tu kuelewa jinsi
GDB kazi kutoka mstari amri.

24
00:01:06,280 --> 00:01:09,650
Lakini tena, kama wewe ni
kutumia CS50 IDE, wewe

25
00:01:09,650 --> 00:01:15,400
Unaweza kutumia HatiJava graphical
ambayo imejengwa katika IDE.

26
00:01:15,400 --> 00:01:18,750
Hivyo kufanya mambo kusonga kwa
GDB, kuanza debugging

27
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mchakato wa fulani
mpango, wote unahitaji kufanya

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ni aina GDB ikifuatiwa
kwa jina mpango.

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Hivyo kwa mfano, kama mpango wako ni
hodi, ungekuwa aina GDB hodi.

30
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>> Wakati wewe kufanya hivyo, wewe ni kwenda
kuvuta up mazingira GDB.

31
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Haraka yako itabadilika, na
badala ya kuwa kile kawaida

32
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ni pale unapoandika mambo
kwa amri line-- ls,

33
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cd-- wote wa kawaida yako
Linux amri, haraka yako

34
00:01:38,115 --> 00:01:42,200
kubadilika na, pengine, kitu
kama mabano GDB mabano.

35
00:01:42,200 --> 00:01:46,630
Hiyo ni GDB yako mpya haraka, kwa sababu
uko ndani ya mazingira GDB.

36
00:01:46,630 --> 00:01:49,830
Mara baada ya ndani ya mazingira ambayo,
kuna amri mbili kuu

37
00:01:49,830 --> 00:01:52,290
kwamba pengine utasikia kutumia
ili zifuatazo.

38
00:01:52,290 --> 00:01:55,200
>> Kwanza ni b, ambayo
ni mfupi kwa ajili ya mapumziko.

39
00:01:55,200 --> 00:01:58,690
Na baada ya wewe aina b, kwa kawaida wewe
aina jina la kazi,

40
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au kama kutokea kwa kujua
kuzunguka kile mstari idadi

41
00:02:01,040 --> 00:02:04,100
mpango wako ni mapya
kuwa na tabia weird kidogo,

42
00:02:04,100 --> 00:02:06,370
unaweza aina line
idadi huko pia.

43
00:02:06,370 --> 00:02:09,660
Nini b, au mapumziko, anafanya
ni inaruhusu programu yako

44
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kuendesha hadi hatua fulani,
yaani, jina la kazi

45
00:02:13,270 --> 00:02:15,880
kwamba bayana au mstari
idadi hiyo bayana.

46
00:02:15,880 --> 00:02:18,590
>> Na katika hatua hiyo, ni
kufungia utekelezaji.

47
00:02:18,590 --> 00:02:21,670
Hili ni jambo zuri, kwa sababu
mara moja utekelezaji imekuwa waliohifadhiwa,

48
00:02:21,670 --> 00:02:25,214
unaweza kuanza polepole sana
hatua kupitia mpango wako.

49
00:02:25,214 --> 00:02:28,130
Kwa kawaida, kama tumekuwa kukimbia
mipango yako, wao ni pretty mfupi.

50
00:02:28,130 --> 00:02:31,250
Kwa kawaida, aina dot slash chochote
jina la mpango wako ni, hit Enter,

51
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na kabla unaweza blink, yako
Mpango tayari kumaliza.

52
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Ni kweli muda mwingi kujaribu
na kufikiri nini kinaendelea vibaya.

53
00:02:36,620 --> 00:02:40,920
Hivyo ni kweli kuwa na uwezo wa kupunguza kasi ya mambo
chini kwa kuweka hatua ya mapumziko na b,

54
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na kisha wanazidi katika.

55
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>> Kisha mara moja umefanya kuweka mapumziko yako
hatua, unaweza kuendesha programu.

56
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Na kama una
hoja mstari amri,

57
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bayana yao hapa, si wakati
aina GDB mpango jina lako.

58
00:02:51,610 --> 00:02:55,980
Wewe taja zote mstari amri
hoja kwa kuchukua r, au kukimbia,

59
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na kisha amri yo hoja mstari
unahitaji ndani ya mpango wako.

60
00:03:00,270 --> 00:03:03,510
Kuna idadi ya mwingine kweli
amri muhimu na manufaa

61
00:03:03,510 --> 00:03:04,970
ndani ya mazingira Pato la Taifa.

62
00:03:04,970 --> 00:03:07,540
Hivyo basi mimi tu haraka
kwenda juu baadhi yao.

63
00:03:07,540 --> 00:03:11,320
>> Kwanza ni n, ambayo ni fupi kwa ajili ya pili,
na unaweza aina ijayo badala ya n,

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wote ingekuwa kazi.

65
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Na ni tu shorthand.

66
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Na kama umefanya pengine tayari wamezipata
kutumika, kuwa na uwezo wa aina ya mambo

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00:03:17,540 --> 00:03:20,520
mfupi kwa ujumla ni bora zaidi.

68
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Na nini itakuwa kufanya ni kutakuwa na
hatua mbele moja kuzuia wa kanuni.

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Hivyo itabidi kusonga mbele
mpaka kazi ya wito.

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Na kisha badala ya
mbizi katika kazi hiyo

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na kwenda njia zote za kazi ambayo
kanuni, itakuwa tu kuwa na kazi.

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>> Kazi wataitwa.

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Itakuwa kufanya lolote kazi yake ni.

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00:03:35,733 --> 00:03:38,870
Itakuwa kurudi thamani ya
kazi ambayo kuitwa hivyo.

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Na kisha utasikia hoja juu ya
mstari wa pili wa kwamba wito kazi.

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Kama unataka hatua
ndani ya kazi,

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badala ya kuwa tu
ni kutekeleza, hasa

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00:03:46,430 --> 00:03:50,004
kama unadhani kwamba tatizo
ili uongo ndani ya kazi kwamba,

79
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unaweza, bila shaka, kuweka mapumziko
uhakika ndani ya kazi hiyo.

80
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Au kama wewe ni tayari mbio, unaweza
kutumia s hatua mbele moja mstari wa kanuni.

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>> Hivyo hii itakuwa hatua katika
na kupiga mbizi katika kazi,

82
00:04:01,170 --> 00:04:04,750
badala ya tu na kutekeleza
na kuendelea juu ya kazi katika

83
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kwamba uko kwa debugging.

84
00:04:07,380 --> 00:04:09,870
Kama wewe milele unataka kujua
thamani ya kutofautiana,

85
00:04:09,870 --> 00:04:12,507
unaweza aina p, au Magazeti,
na kisha jina kutofautiana.

86
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Na kwamba itakuwa magazeti nje kwenu,
ndani ya mazingira GDB,

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jina la kutofautiana, kwamba you--
udhuru ME thamani ya kutofautiana

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kwamba umefanya jina.

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Kama unataka kujua maadili ya kila
ndani kutofautiana kupatikana kutoka ambapo

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00:04:23,230 --> 00:04:25,970
wewe sasa ni katika yako
mpango, unaweza aina ya maelezo wazawa.

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00:04:25,970 --> 00:04:28,332
Ni mengi kwa kasi zaidi kuliko
kuandika p na kisha chochote,

92
00:04:28,332 --> 00:04:30,540
orodha nje wote wa
vigezo kwamba unajua kuwepo.

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Unaweza aina ya maelezo wenyeji, na
magazeti nje kila kitu kwa ajili yenu.

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Next up ni bt, ambayo ni
mfupi kwa nyuma kuwaeleza.

95
00:04:37,770 --> 00:04:41,680
Sasa, kwa ujumla,
mapema hasa katika CS50,

96
00:04:41,680 --> 00:04:44,450
utakuwa si kweli kuwa tukio
kutumia bt, au Nyuma kuwaeleza,

97
00:04:44,450 --> 00:04:47,860
kwa sababu wewe ni kutokuwa na kazi
kwamba wito kazi nyingine.

98
00:04:47,860 --> 00:04:50,450
>> Unaweza kuwa na kuu wito a
kazi, lakini hiyo ni pengine hilo.

99
00:04:50,450 --> 00:04:53,199
Huna kazi ambayo wengine
wito kazi nyingine, ambayo

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wito kazi nyingine, na kadhalika.

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00:04:54,880 --> 00:04:57,550
Lakini kama mipango yako kupata zaidi
tata, na hasa

102
00:04:57,550 --> 00:05:00,290
unapoanza kufanya kazi
na kujirudia, nyuma kuwaeleza

103
00:05:00,290 --> 00:05:05,150
inaweza kuwa njia muhimu kweli kweli basi wewe
aina ya kupata baadhi ya mazingira kwa ambapo

104
00:05:05,150 --> 00:05:06,460
Mimi ni katika mpango wangu.

105
00:05:06,460 --> 00:05:10,590
Hivyo kusema umefanya imeandikwa kanuni yako, na
unajua kwamba kuu wito kazi

106
00:05:10,590 --> 00:05:14,720
f, ambayo inatoa wito kazi
g, ambayo inatoa wito kazi h.

107
00:05:14,720 --> 00:05:17,650
Hivyo tuna tabaka kadhaa
ya nesting kinachoendelea hapa.

108
00:05:17,650 --> 00:05:19,440
>> Kama uko ndani ya
GDB mazingira yako,

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na unajua ndani ya yako
ya h, lakini kusahau

110
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kuhusu nini got wewe ambapo
are-- unaweza aina bt, au nyuma kuwaeleza,

111
00:05:27,210 --> 00:05:32,370
na itakuwa magazeti nje h, g, f kuu,
pamoja na baadhi ya taarifa nyingine, ambayo

112
00:05:32,370 --> 00:05:35,984
anatoa kidokezo kwamba, OK kuu
kuitwa f, f aitwaye g, g aitwaye h,

113
00:05:35,984 --> 00:05:37,900
na hapo ndipo mimi
sasa niko katika mpango wangu.

114
00:05:37,900 --> 00:05:41,380
Hivyo inaweza kuwa muhimu kweli kweli,
hasa kama cryptic-ness ya GDB

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00:05:41,380 --> 00:05:45,667
inakuwa kidogo mno, kwa
kujua hasa ambapo mambo yalivyo.

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00:05:45,667 --> 00:05:48,500
Hatimaye, wakati mpango wako ni kosa,
au wakati wewe ni kosa debugging ni

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na unataka hatua mbali
kutokana na mazingira GDB,

118
00:05:50,125 --> 00:05:51,940
inasaidia kujua jinsi ya kupata nje yake.

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00:05:51,940 --> 00:05:55,500
Unaweza aina q, au kuacha, kupata nje.

120
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Sasa, kabla ya video ya leo
Mimi tayari mpango buggy

121
00:05:59,220 --> 00:06:03,900
aitwaye buggy1, ambayo mimi ulioandaliwa
kutoka faili inayojulikana kama buggy1.c.

122
00:06:03,900 --> 00:06:06,500
Kama unaweza kutarajia, hii
mpango huo ni katika buggy ukweli.

123
00:06:06,500 --> 00:06:08,990
Kitu fulani kitaenda vibaya
wakati mimi kujaribu na kukimbia nayo.

124
00:06:08,990 --> 00:06:13,014
Sasa, kwa bahati mbaya, mimi inadvertently
kufutwa buggy1.c faili yangu,

125
00:06:13,014 --> 00:06:15,930
hivyo ili kwa mimi kufikiri
nini kinaendelea vibaya na mpango huu,

126
00:06:15,930 --> 00:06:18,770
Mimi nina kwenda kuwa na matumizi ya
GDB aina ya upofu, kujaribu

127
00:06:18,770 --> 00:06:22,372
navigate kupitia mpango huu kwa
kufikiri hasa nini kinaendelea vibaya.

128
00:06:22,372 --> 00:06:24,580
Lakini kwa kutumia zana tu
tumekuwa tayari kujifunza kuhusu,

129
00:06:24,580 --> 00:06:27,700
tunaweza takwimu pretty much
nje ni nini hasa.

130
00:06:27,700 --> 00:06:30,740
Basi hebu kichwa juu ya
CS50 IDE na kuwa na kuangalia.

131
00:06:30,740 --> 00:06:33,155
OK, hivyo tuko hapa katika wangu
CS50 IDE mazingira,

132
00:06:33,155 --> 00:06:35,697
na mimi itabidi kuvuta kidogo
hivyo unaweza kuona kidogo zaidi.

133
00:06:35,697 --> 00:06:38,530
Katika terminal dirisha yangu, kama mimi orodha
yaliyomo ya mkurugenzi wangu wa sasa

134
00:06:38,530 --> 00:06:41,250
na ls, tutaweza kuona kwamba mimi
kuwa wanandoa wa files chanzo

135
00:06:41,250 --> 00:06:44,982
hapa, ikiwa ni pamoja na
awali kujadiliwa buggy1.

136
00:06:44,982 --> 00:06:46,940
Ni nini kinachoendelea wakati
Mimi kujaribu na kukimbia buggy1.

137
00:06:46,940 --> 00:06:47,773
Naam hebu kujua.

138
00:06:47,773 --> 00:06:52,510
Mimi aina dot slash,
Buggy, na mimi hit Enter.

139
00:06:52,510 --> 00:06:53,670
>> Mkato makosa.

140
00:06:53,670 --> 00:06:55,000
Hiyo si nzuri.

141
00:06:55,000 --> 00:06:57,180
Kama unakumbuka,
segmentation kosa kawaida

142
00:06:57,180 --> 00:07:01,540
hutokea wakati sisi kupata kumbukumbu
kwamba sisi ni haruhusiwi kugusa.

143
00:07:01,540 --> 00:07:03,820
Tumekuwa namna fulani kufikiwa
nje ya mipaka

144
00:07:03,820 --> 00:07:05,995
ya nini mpango,
compiler, ametupa.

145
00:07:05,995 --> 00:07:08,310
Na hivyo tayari hiyo ni
fununu kuweka katika sanduku la vifaa

146
00:07:08,310 --> 00:07:10,660
kama sisi kuanza mchakato debugging.

147
00:07:10,660 --> 00:07:13,620
Kitu amekwenda vibaya kidogo hapa.

148
00:07:13,620 --> 00:07:15,935
>> Haki wote, hivyo hebu kuanza
up mazingira GDB

149
00:07:15,935 --> 00:07:19,030
na kuona kama tunaweza kufikiri
nini hasa tatizo ni.

150
00:07:19,030 --> 00:07:21,674
Mimi nina kwenda kwa wazi screen yangu,
na mimi nina kwenda aina GDB

151
00:07:21,674 --> 00:07:24,340
tena, kwa iingie katika mazingira GDB,
na jina la mpango

152
00:07:24,340 --> 00:07:27,450
kuwa nataka Debug, buggy1.

153
00:07:27,450 --> 00:07:30,182
Sisi kupata ujumbe kidogo, kusoma
alama kutoka buggy1, kosa.

154
00:07:30,182 --> 00:07:32,390
Wote kwamba maana ni vunjwa
pamoja wote wa kanuni,

155
00:07:32,390 --> 00:07:35,570
na sasa imekuwa ni kubeba katika
GDB, na ni tayari kwenda.

156
00:07:35,570 --> 00:07:37,140
>> Sasa, je, nataka kufanya?

157
00:07:37,140 --> 00:07:39,130
Je, unakumbuka kile
Hatua ya kwanza ni kawaida

158
00:07:39,130 --> 00:07:42,540
baada ya mimi nina ndani ya mazingira haya?

159
00:07:42,540 --> 00:07:44,540
Hopefully, wewe alisema kuweka
hatua ya mapumziko, kwa sababu

160
00:07:44,540 --> 00:07:46,240
kutokana na ukweli kuwa ni nini nataka kufanya.

161
00:07:46,240 --> 00:07:47,990
Sasa, sina
chanzo kanuni kwa hii

162
00:07:47,990 --> 00:07:50,948
mbele yangu, ambayo pengine ni
si kawaida na matumizi ya kesi, kwa njia.

163
00:07:50,948 --> 00:07:52,055
Pengine mapenzi.

164
00:07:52,055 --> 00:07:52,680
Hivyo hiyo ni nzuri.

165
00:07:52,680 --> 00:07:55,790
Lakini kuchukua huna, nini
kazi moja kwamba unajua

166
00:07:55,790 --> 00:07:58,880
ipo katika kila moja C mpango?

167
00:07:58,880 --> 00:08:04,420
Bila kujali jinsi kubwa au jinsi ngumu
ni, kazi hii dhahiri lipo.

168
00:08:04,420 --> 00:08:05,440
Kuu, sawa?

169
00:08:05,440 --> 00:08:08,870
>> Hivyo kushindwa yote, tunaweza
kuweka hatua ya mapumziko katika kuu.

170
00:08:08,870 --> 00:08:12,200
Na tena, mimi naweza aina tu
kuvunja kuu, badala ya b.

171
00:08:12,200 --> 00:08:14,650
Na kama wewe ni curious, kama wewe
milele aina nje amri kwa muda mrefu

172
00:08:14,650 --> 00:08:16,800
na kisha kutambua kwamba
kitu kibaya typed,

173
00:08:16,800 --> 00:08:18,770
na unataka kujikwamua
ya yote kama mimi tu alifanya,

174
00:08:18,770 --> 00:08:22,029
unaweza kuchukua Kudhibiti U, ambayo itakuwa
kufuta kila kitu na kuleta nyuma

175
00:08:22,029 --> 00:08:23,570
mwanzo wa mistari mshale.

176
00:08:23,570 --> 00:08:26,569
Mengi zaidi kuliko tu kushikilia chini
kufuta, au kupiga yake mara rundo

177
00:08:26,569 --> 00:08:27,080
zaidi.

178
00:08:27,080 --> 00:08:28,740
>> Hivyo tutaweza kuweka hatua ya mapumziko katika kuu.

179
00:08:28,740 --> 00:08:32,970
Na kama unaweza kuona, inasema tumekuwa
kuweka hatua ya mapumziko katika faili buggy1.c,

180
00:08:32,970 --> 00:08:36,330
na inaonekana mstari wa kwanza
ya kanuni za kuu ni mstari saba.

181
00:08:36,330 --> 00:08:38,080
Tena, hatuna
chanzo faili hapa,

182
00:08:38,080 --> 00:08:40,429
lakini mimi itabidi kudhani kuwa ni
kuniambia ukweli.

183
00:08:40,429 --> 00:08:44,510
Na kisha, mimi tu kujaribu
na kuendesha programu, r.

184
00:08:44,510 --> 00:08:45,360
Kuanzia mpango.

185
00:08:45,360 --> 00:08:48,160
Haki wote, hivyo ujumbe huu
ni kidogo cryptic.

186
00:08:48,160 --> 00:08:50,160
Lakini kimsingi nini
kinachotokea hapa ni ni tu

187
00:08:50,160 --> 00:08:53,350
kuniambia nimekuwa kugonga mapumziko yangu
uhakika, hatua ya mapumziko namba 1.

188
00:08:53,350 --> 00:08:55,877
>> Na kisha, kuwa mstari wa kanuni,
hakuna vile faili au directory.

189
00:08:55,877 --> 00:08:57,710
Sababu tu kwamba
Mimi nina kuona ujumbe kwamba

190
00:08:57,710 --> 00:09:00,800
ni kwa sababu mimi inadvertently
kufutwa faili yangu buggy.c.

191
00:09:00,800 --> 00:09:04,050
Kama faili yangu buggy1.c kuwepo
katika saraka ya sasa,

192
00:09:04,050 --> 00:09:06,920
kuwa mstari wa kulia ingekuwa kuna kweli
kuniambia nini mstari wa kanuni

193
00:09:06,920 --> 00:09:08,214
halisi anasoma.

194
00:09:08,214 --> 00:09:09,380
Kwa bahati mbaya, mimi ilifutwa yake.

195
00:09:09,380 --> 00:09:14,790
Tunakwenda kuwa na aina ya navigate
kwa njia hii kidogo zaidi upofu.

196
00:09:14,790 --> 00:09:17,330
>> Sawa, hivyo hebu angalia, nini
Je, mimi wanataka kufanya hapa?

197
00:09:17,330 --> 00:09:21,770
Naam, napenda kujua nini ndani
vigezo labda zinapatikana kwangu.

198
00:09:21,770 --> 00:09:23,570
Nimeanza mpango wangu.

199
00:09:23,570 --> 00:09:28,515
Hebu kuona nini inaweza kuwa
Tayari initialized kwa ajili yetu.

200
00:09:28,515 --> 00:09:31,430
Mimi aina Info wenyeji, hakuna wazawa.

201
00:09:31,430 --> 00:09:33,960
Haki wote, hivyo kwamba hana
nipe tani ya habari.

202
00:09:33,960 --> 00:09:37,600
Mimi naweza kujaribu na magazeti nje kutofautiana,
lakini sijui majina yoyote kutofautiana.

203
00:09:37,600 --> 00:09:39,930
Mimi naweza kujaribu nyuma kuwaeleza,
lakini nina ndani ya kuu,

204
00:09:39,930 --> 00:09:43,710
hivyo najua mimi si alifanya
mwingine wito kazi hivi sasa.

205
00:09:43,710 --> 00:09:47,710
>> Hivyo inaonekana kama chaguzi yangu tu ni
kutumia n au hivyo na kuanza kupiga mbizi katika.

206
00:09:47,710 --> 00:09:49,630
Mimi nina kwenda kutumia n.

207
00:09:49,630 --> 00:09:51,180
Hivyo mimi aina n.

208
00:09:51,180 --> 00:09:53,060
Oh gosh wangu, ni nini kinaendelea hapa.

209
00:09:53,060 --> 00:09:56,260
Programu ya kupokea ishara,
SIGSEGV segmentation kosa,

210
00:09:56,260 --> 00:09:57,880
na kisha rundo zima ya mambo.

211
00:09:57,880 --> 00:09:58,880
Tayari nina kuzidiwa.

212
00:09:58,880 --> 00:10:00,980
Naam, kuna kweli
mengi ya kujifunza hapa.

213
00:10:00,980 --> 00:10:02,520
Basi nini hii kutuambia?

214
00:10:02,520 --> 00:10:09,180
Nini inatuambia ni, mpango huu ni
karibu, lakini ina bado, seg kosa.

215
00:10:09,180 --> 00:10:12,550
Na hasa, mimi nina kwenda
kwa kuvuta hata zaidi hapa,

216
00:10:12,550 --> 00:10:18,980
ni kuhusu kosa seg kuhusu
kitu kinachoitwa strcmp.

217
00:10:18,980 --> 00:10:22,705
>> Sasa, hatuwezi kujadili
kazi hii kwa kina.

218
00:10:22,705 --> 00:10:25,580
Lakini is-- kwa sababu sisi siyo kwenda
kuzungumzia kila kazi ambayo

219
00:10:25,580 --> 00:10:28,610
ipo katika kiwango cha maktaba C
lakini wao ni wote inapatikana na wewe,

220
00:10:28,610 --> 00:10:32,110
hasa kama wewe kuchukua
kuangalia reference.cs50.net.

221
00:10:32,110 --> 00:10:35,000
Na strcmp ni kweli nguvu
kazi ambayo ipo ndani ya

222
00:10:35,000 --> 00:10:38,070
ya kichwa string.h
file, ambayo ni header

223
00:10:38,070 --> 00:10:41,970
faili kwamba ni kujitolea na kazi
kwamba kazi kwa na kuendesha masharti.

224
00:10:41,970 --> 00:10:49,830
>> Na hasa, nini strcmp gani ni
inalinganishwa maadili ya masharti mawili.

225
00:10:49,830 --> 00:10:54,160
Hivyo mimi nina kuhusu segmentation kosa
juu ya wito kwa strcmp inaonekana.

226
00:10:54,160 --> 00:10:58,530
Mimi kugonga n, na kwa kweli mimi kupata ujumbe,
Mpango kuachishwa kwa ishara SIGSEGV

227
00:10:58,530 --> 00:11:01,370
segmentation kosa. Hivyo sasa
Mimi kwa kweli kuwa seg alipinga,

228
00:11:01,370 --> 00:11:06,479
na mpango wangu ana pretty
mengi kwa ufanisi wamekata.

229
00:11:06,479 --> 00:11:07,770
Hii ni mwisho wa mpango.

230
00:11:07,770 --> 00:11:10,370
Ni kuvunja chini, ni kugonga.

231
00:11:10,370 --> 00:11:14,740
Hivyo haikuwa mengi, lakini mimi
kwa kweli kujifunza kidogo kabisa

232
00:11:14,740 --> 00:11:16,747
kutokana na uzoefu huu kidogo.

233
00:11:16,747 --> 00:11:17,580
Nini mimi kujifunza?

234
00:11:17,580 --> 00:11:22,020
Naam, mpango wangu shambulio
pretty much mara moja.

235
00:11:22,020 --> 00:11:26,300
Mpango wangu shambulio juu ya
a kuwaita kwa strcmp, lakini mimi

236
00:11:26,300 --> 00:11:30,560
hawana vigezo mitaa yoyote katika yangu
Mpango wakati huo ni shambulio.

237
00:11:30,560 --> 00:11:37,320
Kwa hiyo kile kamba, au masharti,
nitaweza uwezekano kuwa kulinganisha.

238
00:11:37,320 --> 00:11:42,140
Kama sina lolote ndani
vigezo, waweza

239
00:11:42,140 --> 00:11:45,520
kusema kuwa mimi have-- huko labda ni
variable kimataifa, ambayo inaweza kuwa kweli.

240
00:11:45,520 --> 00:11:47,670
>> Lakini kwa ujumla, inaonekana
kama mimi nina kulinganisha

241
00:11:47,670 --> 00:11:52,070
kitu ambacho haipo.

242
00:11:52,070 --> 00:11:54,130
Basi hebu kuchunguza
kuwa kidogo zaidi.

243
00:11:54,130 --> 00:11:55,120
Hivyo nina kwenda kwa wazi screen yangu.

244
00:11:55,120 --> 00:11:57,536
Mimi nina kwenda kuacha nje ya
GDB mazingira kwa ajili ya pili.

245
00:11:57,536 --> 00:12:01,300
Na mimi nina kufikiri, OK, hivyo kuna
hakuna vigezo mitaa katika mpango wangu.

246
00:12:01,300 --> 00:12:06,444
Nashangaa kama labda natakiwa kupita
katika kamba kama hoja mstari amri.

247
00:12:06,444 --> 00:12:07,610
Basi hebu tu mtihani huu nje.

248
00:12:07,610 --> 00:12:09,020
Mimi sina kosa hili kabla.

249
00:12:09,020 --> 00:12:14,244
>> Hebu angalia kama labda kama mimi kukimbia mpango huu
na mstari amri hoja ni kazi.

250
00:12:14,244 --> 00:12:16,140
Ha, hakuna kosa segmentation huko.

251
00:12:16,140 --> 00:12:17,870
Ni tu aliniambia kuwa mimi figured nje.

252
00:12:17,870 --> 00:12:19,170
Hivyo labda hiyo ni kurekebisha hapa.

253
00:12:19,170 --> 00:12:27,560
Na hakika, kama mimi kwenda nyuma na kuangalia
halisi chanzo kanuni kwa buggy1.c,

254
00:12:27,560 --> 00:12:31,180
inaonekana kana kwamba nini mimi kufanya ni
Mimi nina kufanya wito kwa strcmp bila

255
00:12:31,180 --> 00:12:34,010
kuangalia kama kweli argv [1] lipo.

256
00:12:34,010 --> 00:12:36,730
Hii ni kweli
chanzo kanuni kwa buggy1.c.

257
00:12:36,730 --> 00:12:38,855
Hivyo kile kwa kweli wanahitaji
kufanya hapa kurekebisha mpango wangu,

258
00:12:38,855 --> 00:12:40,835
kuchukua nina
faili mbele yangu, ni

259
00:12:40,835 --> 00:12:44,740
kwa kuongeza tu kuangalia kufanya
kuhakikisha kwamba argc ni sawa na 2.

260
00:12:44,740 --> 00:12:47,780
Hivyo mfano huu, tena, kama nilivyosema,
ni kidogo contrived, sawa?

261
00:12:47,780 --> 00:12:49,840
Wewe ni kwa ujumla si kwenda
ajali kufuta chanzo kanuni yako

262
00:12:49,840 --> 00:12:51,820
na kisha kuwa na kujaribu
na Debug mpango.

263
00:12:51,820 --> 00:12:53,120
Lakini hopefully, lilitoa
wewe mfano

264
00:12:53,120 --> 00:12:55,120
ya aina ya mambo ambayo
ungeweza kufikiria

265
00:12:55,120 --> 00:12:56,610
kama wewe ni debugging programu yako.

266
00:12:56,610 --> 00:12:58,760
>> Nini hali ya mambo hapa ni?

267
00:12:58,760 --> 00:13:00,510
Nini vigezo gani mimi
kuwa kupatikana kwa mimi?

268
00:13:00,510 --> 00:13:03,600
Ambapo hasa ni mpango wangu
crashing, juu ya nini line,

269
00:13:03,600 --> 00:13:05,240
juu ya nini wito kwa nini kazi?

270
00:13:05,240 --> 00:13:06,952
Ni aina gani ya dalili gani kwamba nipe?

271
00:13:06,952 --> 00:13:08,910
Na hii ndiyo hasa
aina ya mawazo kwamba wewe

272
00:13:08,910 --> 00:13:12,820
lazima kuingia katika wakati uko
kufikiria juu debugging programu yako.

273
00:13:12,820 --> 00:13:13,820
>> Mimi nina Doug Lloyd.

274
00:13:13,820 --> 00:13:16,140
Hii ni CS50.

275
00:13:16,140 --> 00:15:08,642