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1
00:00:00,000 --> 00:00:01,500
>> [Daqq ta mużika]

2
00:00:01,500 --> 00:00:11,000

3
00:00:11,000 --> 00:00:16,110
>> DAVID Malan: Kull dritt dan huwa CS50
u dan huwa t-tmiem ta 'ġimgħa.

4
00:00:16,110 --> 00:00:20,760
So I tixtieq tintroduċi eks tiegħi
advisee, Andel Duff, li mhux biss jagħmel

5
00:00:20,760 --> 00:00:25,460
iPhone 5 stands, kif ukoll dan
lectern, huwa jagħmel ukoll karozzi.

6
00:00:25,460 --> 00:00:27,927

7
00:00:27,927 --> 00:00:29,510
ANSEL DUFF: Kif jgħid huwa għaddej, kulħadd?

8
00:00:29,510 --> 00:00:31,980
I biss trid jgħidlek ftit
ftit dwar Formula SAE, li jien

9
00:00:31,980 --> 00:00:32,604
am-kaptan.

10
00:00:32,604 --> 00:00:33,437
Huwa ta 'tim MIT.

11
00:00:33,437 --> 00:00:35,520
I biss trid jgħidlek
guys ftit dwar dan

12
00:00:35,520 --> 00:00:37,520
u nisperaw jiġġeneraw xi interess.

13
00:00:37,520 --> 00:00:41,590
>> So let me biss run permezz ta '
koppja affarijiet dwar it-tim tagħna.

14
00:00:41,590 --> 00:00:43,640
Allura aħna qed kompletament
student run, wherein kollha

15
00:00:43,640 --> 00:00:47,300
tad-disinn membri, jissimulaw,
test, u l-manifattur sottosistema

16
00:00:47,300 --> 00:00:48,090
tal-karozza.

17
00:00:48,090 --> 00:00:51,240
Għandna ħanut magna tagħna stess
u garaxxijiet, u N52-- jew sorry,

18
00:00:51,240 --> 00:00:54,140
N51-- li hija l-istess bini
bħala l-MIT Xjenza Museum.

19
00:00:54,140 --> 00:00:55,990
U aħna huma l-persuni
li jsuq il-karozza.

20
00:00:55,990 --> 00:00:58,340
Hemm kompetizzjoni nazzjonali
fil-bidu tas-sajf,

21
00:00:58,340 --> 00:01:01,215
u allura hemm penalties iżgħar
kompetizzjonijiet matul is-sena.

22
00:01:01,215 --> 00:01:04,400
U allura aħna nagħmlu taħriġ ta 'sewwieq
ġranet biex tikseb membri ġodda familjari.

23
00:01:04,400 --> 00:01:08,280
>> Jiem jibnu tagħna huma fuq
Sibtijiet 11:00-20:00.

24
00:01:08,280 --> 00:01:11,060
Lunch u dinner qed tieħu ħsieb
ta ', minn dik tas-Bertucci u Beantown

25
00:01:11,060 --> 00:01:12,130
rispettivament.

26
00:01:12,130 --> 00:01:15,260
Għandna laqgħa ta 'kull ġimgħa u
seminar, li huwa għall-kreditu kors.

27
00:01:15,260 --> 00:01:18,560
Li huwa ġdid bħala ta 'dan is-semestru, u
se jkun ukoll għall semestru li jmiss,

28
00:01:18,560 --> 00:01:19,940
sabiex inti tista 'jaqsmu reg għal dak.

29
00:01:19,940 --> 00:01:22,960
U allura għandna tfassil, shop,
u l-ġranet CAD matul il-ġimgħa,

30
00:01:22,960 --> 00:01:26,870
billi l-membri se indipendentement
Partijiet CAD, stokk ordni eċċetera.

31
00:01:26,870 --> 00:01:29,200
>> Allura għal elettriku
inġinerija fil-tim

32
00:01:29,200 --> 00:01:31,110
għandna trattiva tagħna,
sistema ta 'vultaġġ għoli,

33
00:01:31,110 --> 00:01:33,390
li tmur fi nominali
300 volt, li tinkludi

34
00:01:33,390 --> 00:01:35,360
muturi, kontrolluri tal-muturi,
u pakki ta 'batteriji.

35
00:01:35,360 --> 00:01:37,235
Imbagħad għandna baxxa
sistema vultaġġ, li tmur

36
00:01:37,235 --> 00:01:40,180
fit-12-volt, li jinkludi
kontrolli, CAN lymph, il-moħħ

37
00:01:40,180 --> 00:01:41,570
kaxxa, u l-dashboard.

38
00:01:41,570 --> 00:01:43,890
Safejn CS tmur, nagħmlu
jkollhom manutenzjoni website

39
00:01:43,890 --> 00:01:47,940
li għandna bżonn isir għal avvenimenti, sħubija
bidliet, stampi ġodda, u materjal PR.

40
00:01:47,940 --> 00:01:51,540
U allura għandna kodiċi li jikkontrolla l-
karozza għal kontroll ta 'trazzjoni tagħna, tnedija

41
00:01:51,540 --> 00:01:55,750
kontroll, kontroll sing, vettoru torque,
u sistemi ta 'brejkijiet riġenerattiva, li

42
00:01:55,750 --> 00:01:59,170
run tipikament fil MATLAB,
Simulink, u Labview.

43
00:01:59,170 --> 00:02:00,910
>> Jgħidlek ftit dwar il-karozza.

44
00:02:00,910 --> 00:02:02,470
Allura huwa madwar 500 liri.

45
00:02:02,470 --> 00:02:04,285
Huwa regoli limitati għal 85 f'kilowatts.

46
00:02:04,285 --> 00:02:08,310
Hija 2 EMRAX 207 muturi fil-
lura, wieħed għal kull rota ta 'wara.

47
00:02:08,310 --> 00:02:11,880
Hija pakketti mibnija apposta batterija
minn ċelluli A123 pouch priżmatiċi,

48
00:02:11,880 --> 00:02:14,780
jammontaw 300 volt u
5.6 sigħat kilowatt.

49
00:02:14,780 --> 00:02:17,950
U huwa drive diretta ma '
proporzjon 2.64-1 drive.

50
00:02:17,950 --> 00:02:20,970
Hawn huma xi ritratti aħna
ħa ta 'dan fil-kompetizzjoni.

51
00:02:20,970 --> 00:02:25,820
Hawn il-kon-dahar, imnieħer,
u hawn huma l-muturi,

52
00:02:25,820 --> 00:02:29,682
dawk disks big black
taħt l-et mens manus.

53
00:02:29,682 --> 00:02:32,140
Hawn slide li I jinġibed
out ta 'l-iskema kompetizzjoni tagħna.

54
00:02:32,140 --> 00:02:35,389
U dan huwa biss jqabbel karozza tagħna għal
Koppja ta 'karozzi disponibbli kummerċjalment,

55
00:02:35,389 --> 00:02:38,380
bħall-XBOW KTM, Ariel
Atom, u Caterha M 7-280.

56
00:02:38,380 --> 00:02:42,110
Jekk int familjari mal-prezz, l-enerġija
iġbed piż, dollaru kull horsepower,

57
00:02:42,110 --> 00:02:44,930
dollaru kull torque, u karozza tagħna
daqqa lilhom kollha barra mill-ilma.

58
00:02:44,930 --> 00:02:47,520
Jekk għandek xi mistoqsijiet,
LOGHOME stabbiliti dan l-indirizz email.

59
00:02:47,520 --> 00:02:50,800
Rimja email fuq fsae@mit.edu.

60
00:02:50,800 --> 00:02:53,350
>> Aħna kuntenti li jitkellmu dwar
xi ħaġa li tixtieq.

61
00:02:53,350 --> 00:02:55,600
Istudenti Harvard huma tip
tal-minoranza fuq it-tim.

62
00:02:55,600 --> 00:02:58,350
Jekk għandek xi mistoqsijiet dwar
li jekk jogħġbok do rimja us email,

63
00:02:58,350 --> 00:03:00,810
kuntenti li jitkellmu, u jien ser
ras lura fuq għall David.

64
00:03:00,810 --> 00:03:01,550
Grazzi.

65
00:03:01,550 --> 00:03:02,466
I japprezzaw dan, guys.

66
00:03:02,466 --> 00:03:03,615
[Applause]

67
00:03:03,615 --> 00:03:07,080

68
00:03:07,080 --> 00:03:10,980
>> DAVID Malan: Ansel jintefqu-sajf
taħdem magħna hawn fuq il-kampus fil CS50

69
00:03:10,980 --> 00:03:11,480
dan is-sajf.

70
00:03:11,480 --> 00:03:13,505
U minbarra li jaħdmu fuq
affarijiet bħall-basal binarja,

71
00:03:13,505 --> 00:03:16,090
hu attwalment verament fetaħ tagħna
eyes-- u mini fid particular--

72
00:03:16,090 --> 00:03:20,535
għal dak li verament l-intersezzjoni ta '
mhux ta 'hardware u software jista' jkun.

73
00:03:20,535 --> 00:03:23,410
Fil-fatt ħafna mill-affarijiet hu biss
daret inti permezz huma finalment

74
00:03:23,410 --> 00:03:26,030
maħluqa ewwel fis-software,
u mbagħad finalment iffabbrikat

75
00:03:26,030 --> 00:03:27,299
fid-dinja reali fil-hardware.

76
00:03:27,299 --> 00:03:29,590
Mela jekk int interessat fil-
esplorazzjoni li intersezzjoni,

77
00:03:29,590 --> 00:03:31,430
forsi tieħu up dak il-grupp.

78
00:03:31,430 --> 00:03:34,140
>> Issa sadanittant, dawk minnkom
li huma fannijiet ta 'teknoloġija,

79
00:03:34,140 --> 00:03:36,140
u prodotti tat-tuffieħ fil
partikolari jafu li hemm

80
00:03:36,140 --> 00:03:37,860
kienu koppja ta '
Avviżi bieraħ.

81
00:03:37,860 --> 00:03:39,776
Iżda ħsibna aħna'd juru
inti wieħed li ħareġ

82
00:03:39,776 --> 00:03:43,590
ftit jiem qabel dik
inti tista 'ma raw.

83
00:03:43,590 --> 00:03:46,150
>> Jorgen EGHAMMER: You know,
darba fil xi ħaġa awhile

84
00:03:46,150 --> 00:03:49,540
ġejja flimkien li
Tibdel il-mod kif ngħixu.

85
00:03:49,540 --> 00:03:53,479
Mezz tant sempliċi u intuwittivi
użu iħoss kważi familjari.

86
00:03:53,479 --> 00:03:59,710

87
00:03:59,710 --> 00:04:04,138
L-introduzzjoni 2015 katalogu IKEA.

88
00:04:04,138 --> 00:04:10,420
Mhuwiex ktieb diġitali jew
e-book, huwa ktieb ktieb.

89
00:04:10,420 --> 00:04:14,440
>> L-ewwel ħaġa li wieħed jinnota l-ebda
kejbils, lanqas power cable.

90
00:04:14,440 --> 00:04:18,519
Il-katalgu IKEA 2015
taqa ċċarġjati kompletament,

91
00:04:18,519 --> 00:04:20,550
u l-ħajja tal-batteriji hija dejjiema.

92
00:04:20,550 --> 00:04:27,300
L-interface huwa 7.5 bi 8 pulzier,
iżda jistgħu jespandu sa 15 minn 8 pulzier.

93
00:04:27,300 --> 00:04:32,410
Il-navigazzjoni hija bbażata fuq touch tactile
teknoloġija li inti tista 'attwalment iħossu.

94
00:04:32,410 --> 00:04:37,120
>> Kontenut jiġi installat minn qabel
via 328 paġni ta 'definizzjoni għolja

95
00:04:37,120 --> 00:04:40,180
jispira ideat dar dar.

96
00:04:40,180 --> 00:04:43,740
Biex tibda browsing,
sempliċiment touch u drag.

97
00:04:43,740 --> 00:04:50,870
Lemin għax-xellug biex jimxu 'l quddiem,
xellug għal-lemin biex jimxu lura.

98
00:04:50,870 --> 00:04:52,770
>> Avviż xi ħaġa oħra?

99
00:04:52,770 --> 00:04:53,780
Dak id-dritt.

100
00:04:53,780 --> 00:04:55,190
Nru lag.

101
00:04:55,190 --> 00:04:58,400
Kull paġna ċara kristall
tagħbijiet istantanju,

102
00:04:58,400 --> 00:05:00,586
ebda kwistjoni kif fast inti iscroll.

103
00:05:00,586 --> 00:05:03,710
Jekk inti tixtieq li tikseb ħarsa ta 'malajr,
biss żommha fil-keffa ta 'idejk,

104
00:05:03,710 --> 00:05:06,816
u bl-użu biss thumb tiegħek,
veloċità jibbrawżjaw il-kontenut.

105
00:05:06,816 --> 00:05:10,930
>> Jekk issib xi ħaġa li inti tixtieq li jiffrankaw
għal aktar tard, inti tista 'sempliċement bookmark.

106
00:05:10,930 --> 00:05:17,620
U anki jekk inti qrib l-applikazzjoni,
inti tista 'faċilment isibu l-bookmark ġdid.

107
00:05:17,620 --> 00:05:18,490
Amazing.

108
00:05:18,490 --> 00:05:20,434
>> [Rires]

109
00:05:20,434 --> 00:05:21,406
[Applause]

110
00:05:21,406 --> 00:05:26,760

111
00:05:26,760 --> 00:05:29,870
Allura li twassalna biex
l-aħħar ta 'ġimgħa.

112
00:05:29,870 --> 00:05:31,760
A ftit avviżi issa.

113
00:05:31,760 --> 00:05:33,440
Allura sezzjonali issa hija fil-progress.

114
00:05:33,440 --> 00:05:36,860
Mur dan il-URL hawn f'xi
bejn issa u l-Ġimgħa f'nofsinhar

115
00:05:36,860 --> 00:05:39,960
li attwalment tispeċifika jekk inti
fost dawk inqas komdi, aktar

116
00:05:39,960 --> 00:05:41,690
komdu, jew x'imkien bejniethom.

117
00:05:41,690 --> 00:05:44,511
>> Dan huwa tipikament waħda minn dawk
affarijiet li inti biss tip ta 'jafu.

118
00:05:44,511 --> 00:05:47,510
U fil-fatt dawk minnkom li huma inqas
komdu probabilment taf kemm,

119
00:05:47,510 --> 00:05:49,634
dawk minnkom li huma aktar
komdu tkun taf kemm,

120
00:05:49,634 --> 00:05:54,960
u għal darb'oħra jekk m'intix pjuttost ċert liema
ta 'dawk bramel inti jaqgħu int

121
00:05:54,960 --> 00:05:56,210
probabbilment x'imkien bejniethom.

122
00:05:56,210 --> 00:05:59,810
Imma mistrieħ assigurat inti tista tpartit
wara ftit ġimgħat jekk ikun hemm bżonn.

123
00:05:59,810 --> 00:06:02,620
>> Sadanittant, għall-ġimgħa li ġejjin
aħna ma tibda sezzjonijiet per se,

124
00:06:02,620 --> 00:06:04,760
iżda sezzjonijiet super, li
huma miftuħa għall-istudenti kollha.

125
00:06:04,760 --> 00:06:08,220
Dan ġejjin Ħadd fil f'post li
tkun imħabbra fuq il-websajt kors

126
00:06:08,220 --> 00:06:10,190
aħna se jkollhom waħda għall-
dawk inqas komdi,

127
00:06:10,190 --> 00:06:12,470
kif ukoll wieħed għall
dawk aktar komda.

128
00:06:12,470 --> 00:06:15,460
U dawk x'imkien bejniethom
jistgħu jagħżlu liema minn dawn iż-żewġ,

129
00:06:15,460 --> 00:06:17,360
jew it-tnejn jekk inti tixtieq, biex ipoġġu fil dwar.

130
00:06:17,360 --> 00:06:19,630
U l-fokus ta 'dawk
se jkun finalment fuq C,

131
00:06:19,630 --> 00:06:22,440
li aħna ser tkompli tagħna
konverżazzjoni tal-lum.

132
00:06:22,440 --> 00:06:25,070
>> Problema sett 0 sadanittant huwa
nisperaw fl idejk.

133
00:06:25,070 --> 00:06:27,500
Uffiċjalment għada dovut,
Ħamis, f'nofsinhar.

134
00:06:27,500 --> 00:06:29,490
Sakemm inti flus kontanti fl waħda
ta '5 ijiem tard tiegħek,

135
00:06:29,490 --> 00:06:31,780
liema bdil iġib dan
sakemm il-ġimgħa f'nofsinhar.

136
00:06:31,780 --> 00:06:34,420
Problema stabbilixxa l-1 sadanittant se jkun
stazzjonati fuq il-websajt il-kors tal-.

137
00:06:34,420 --> 00:06:37,381
U dan se jkun l-ewwel tagħna
foray bħala klassi fis C.

138
00:06:37,381 --> 00:06:40,630
U dik il-problema jistabbilixxu spec se jimxu miegħek
permezz ta 'lott ta' l-mechanics ta 'dak li

139
00:06:40,630 --> 00:06:43,960
bdejna nitkellmu nhar it-Tnejn,
u aħna ser tkompli jitkellem dwar llum.

140
00:06:43,960 --> 00:06:46,770
C, Linux, il-CS50
appliance, li kollha li

141
00:06:46,770 --> 00:06:48,990
se jistennewkom fil-ispeċifikazzjoni.

142
00:06:48,990 --> 00:06:52,840
>> Uffiċċju siegħa sadanittant huma fil-progress,
fis-sala dining undergraduate.

143
00:06:52,840 --> 00:06:56,240
Head sa dan il-URL hawn biex tara d-
iskeda għall tonight u għada,

144
00:06:56,240 --> 00:06:57,930
jekk inti tixtieq biex ikollhom sehem.

145
00:06:57,930 --> 00:07:01,920
Mistoqsijiet sadanittant, sabiex inti
ikollhom opportunitajiet li jistaqsu mistoqsijiet

146
00:07:01,920 --> 00:07:05,860
asynchronously, 24/7, tirrealizza int
mhux limitat għal taqsimiet u l-uffiċċju

147
00:07:05,860 --> 00:07:09,530
sigħat, iżda pjuttost din l-għodda
hawn, CS50 Iddiskuti f'dak URL

148
00:07:09,530 --> 00:07:12,150
se tkun online l-kors tal-
bulletin board software, li permezz tagħhom

149
00:07:12,150 --> 00:07:15,030
inti tista 'tistaqsi mistoqsijiet ta'
klassi u wkoll lill-persunal.

150
00:07:15,030 --> 00:07:18,492
Allura wieħed iżomm f'moħħu li riżorsi kif ukoll.

151
00:07:18,492 --> 00:07:20,200
Sadanittant tradizzjoni
jibda dan Ġimgħa.

152
00:07:20,200 --> 00:07:23,200
Kif jista 'jkollok glimpsed minn
teaser video nhar l-Erbgħa,

153
00:07:23,200 --> 00:07:25,510
għandna tradizzjoni aktar
kull Ġimgħa matul il-mandat

154
00:07:25,510 --> 00:07:28,750
ta 'teħid madwar 50 studenti u
persunal lil restorant lokali msejħa

155
00:07:28,750 --> 00:07:31,510
Nar u Silġ, li biha aħna qed
tipikament ssieħbu minn xi alumni

156
00:07:31,510 --> 00:07:33,850
jew ħbieb mill-industrija
li ġeneralment jaspiraw

157
00:07:33,850 --> 00:07:35,780
biex jagħmlu klassi kbir jħossu iżgħar.

158
00:07:35,780 --> 00:07:37,560
Allura huwa ikla kompletament każwali.

159
00:07:37,560 --> 00:07:40,160
A mazz minna, il-persunal
speċjalment, se tilgħab siġġijiet mużikali

160
00:07:40,160 --> 00:07:43,360
u chat ma 'studenti dwar
50, il-ħajja barra ta '50,

161
00:07:43,360 --> 00:07:46,510
ħajja fil-futur, id-dinja reali,
Jien jitkellem dwar opportunitajiet ta 'xogħol

162
00:07:46,510 --> 00:07:47,680
mal-ħbieb fl-industrija.

163
00:07:47,680 --> 00:07:51,110
>> Mela jekk inti tixtieq li jingħaqdu magħna
dan Ġimgħa, ras għal dan il-URL hawn.

164
00:07:51,110 --> 00:07:54,180
Ispazju huwa limitat, iżda aħna ser nagħmlu dan
recurringly tul it-terminu.

165
00:07:54,180 --> 00:07:57,380
Kap hemm biex cs50.harvard.edu/rsvp.

166
00:07:57,380 --> 00:07:59,380
U jekk inti ma tieħux fl
dan iż-żmien, biex ma tinkwetax.

167
00:07:59,380 --> 00:08:02,390
Aħna se tagħmel mill-ġdid fil-
-ġimgħat li ġejjin kif ukoll.

168
00:08:02,390 --> 00:08:05,434
>> Allura dan huwa l-istampa
aħna miżbugħa aħħar ġimgħa,

169
00:08:05,434 --> 00:08:07,350
u inti probabilment ħadthom ġiet
dabbling fil s'issa.

170
00:08:07,350 --> 00:08:10,360
Imma ejja jippruvaw li jgħaqqdu dan issa
għal dak li aħna qed tmur biex tagħmel illum

171
00:08:10,360 --> 00:08:11,440
u 'l quddiem.

172
00:08:11,440 --> 00:08:14,760
Jista I jkollhom voluntier wieħed?

173
00:08:14,760 --> 00:08:16,000
Kull dritt, jew diversi.

174
00:08:16,000 --> 00:08:18,460
Kif dwar hawn fuq il-
aħħar, fil-qmis blu.

175
00:08:18,460 --> 00:08:20,329
Come fuq up, x'hemm isem tiegħek?

176
00:08:20,329 --> 00:08:20,870
Alana: Alana.

177
00:08:20,870 --> 00:08:21,661
DAVID Malan: Alana.

178
00:08:21,661 --> 00:08:25,100
Allura Alana, għal ftit
moment-- sbieħ li jissodisfaw you--

179
00:08:25,100 --> 00:08:28,260
huwa se jkollu l-irwol
ta 'din il-funzjoni hawn.

180
00:08:28,260 --> 00:08:31,290
Il-blokk vjola konna
imsejħa s'issa funzjoni.

181
00:08:31,290 --> 00:08:34,830
Allura dak li jien se jmorru
quddiem hawn u joffru Alana

182
00:08:34,830 --> 00:08:38,380
huwa isem tag ftit, biex jagħmlu
ċara liema rwol int playing.

183
00:08:38,380 --> 00:08:39,753
>> Allura inti għandu jkun il-blokk jgħidu.

184
00:08:39,753 --> 00:08:41,419
Jekk inti tixtieq li tmur quddiem u mqiegħda dik fuq.

185
00:08:41,419 --> 00:08:43,169
U aħna qed tmur biex
iżommu din super sempliċi.

186
00:08:43,169 --> 00:08:46,180
Jekk l-għan fil-idejn huwa sempliċiment
issa biex jimplimentaw Alana,

187
00:08:46,180 --> 00:08:49,710
din l-hekk imsejħa jgħidu blokk,
hawnhekk kif li għaddej biex jaħdmu.

188
00:08:49,710 --> 00:08:52,574
I have-- ejja sejħa hija
argument jew parametru,

189
00:08:52,574 --> 00:08:54,240
huwa verament ftit folja vojta tal-karta.

190
00:08:54,240 --> 00:08:57,239
U huwa abjad li tip ta 'jkun reminixxenti
tal-kaxxa bajda li fih inti

191
00:08:57,239 --> 00:08:58,080
jistgħu jiktbu kliem.

192
00:08:58,080 --> 00:09:00,660
>> Sadanittant jien se jmorru hawn.

193
00:09:00,660 --> 00:09:06,560
Jien ser jimxi 'l quddiem u
jiktbu H-E--O L L comma dinja.

194
00:09:06,560 --> 00:09:09,972
U issa I, bħala jiġifieri l-programmer, ma
tassew taf kif jgħidu xi ħaġa.

195
00:09:09,972 --> 00:09:12,180
I jistgħu joħorġu bil-kliem,
imma jien ma neċessarjament

196
00:09:12,180 --> 00:09:15,220
taf kif jesprimu myself
verbalment jew fuq l-iskrin.

197
00:09:15,220 --> 00:09:17,280
U hekk dak li jien ser
biex tagħmel huwa li tieħu din il-biċċa

198
00:09:17,280 --> 00:09:21,157
ta 'funzjonalità, li input--
jew argument, kif aħna ser sejħa hija,

199
00:09:21,157 --> 00:09:23,990
Stajt bil-miktub dwar din il-biċċa ta 'paper--
u jien ser jesternalizzaw dan.

200
00:09:23,990 --> 00:09:26,831
>> U fil-fatt li l-irwol li
funzjonijiet lingwa ta 'programmar

201
00:09:26,831 --> 00:09:27,330
tista 'tilgħab.

202
00:09:27,330 --> 00:09:29,246
Xi ħaġa bħall-kelma
blokk jistgħu jiġu esternalizzati

203
00:09:29,246 --> 00:09:32,074
lil xi ħadd li verament jaf
liema hu jew hi qed jitkellem dwar.

204
00:09:32,074 --> 00:09:33,990
Mela jekk inti ser pass fuq
hawn għal ftit mument,

205
00:09:33,990 --> 00:09:40,092
I am ser tgħaddi dan input li
Alana, u nitolbu li inti ngħid dan input.

206
00:09:40,092 --> 00:09:41,202
>> Alana: Hello, dinja.

207
00:09:41,202 --> 00:09:42,160
DAVID Malan: Dak it.

208
00:09:42,160 --> 00:09:43,326
Allura li hemm funzjoni.

209
00:09:43,326 --> 00:09:46,556
Issa nistgħu teħodha ftit aktar,
nistgħu nieħdu pass 'il quddiem hawn.

210
00:09:46,556 --> 00:09:48,180
Minħabba li kien ċar underwhelming.

211
00:09:48,180 --> 00:09:51,670
Mela ejja issa jikkonvertu dan
xi ftit aktar sofistikati.

212
00:09:51,670 --> 00:09:53,630
>> Allura dan il-kors huwa verżjoni C tagħna.

213
00:09:53,630 --> 00:09:56,760
Mela issa jekk inti tixtieq li jieħdu dik
off wieħed, dak l-isem tag off,

214
00:09:56,760 --> 00:09:58,530
u ejja jkollhom inti tpoġġi fuq isem ġdid.

215
00:09:58,530 --> 00:10:00,850
Imma fundamentalment int
jilagħbu l-istess rwol,

216
00:10:00,850 --> 00:10:03,400
huwa biss hekk jiġri li
jiġu msejħa printf issa.

217
00:10:03,400 --> 00:10:06,930
>> L-istorja huwa, ovvjament,
ser be-- probabbilment

218
00:10:06,930 --> 00:10:09,317
daqstant underwhelming-- huwa
ser ikunu dawn li ġejjin.

219
00:10:09,317 --> 00:10:10,650
Inti issa huma l-printf funzjoni.

220
00:10:10,650 --> 00:10:13,300
I am l-sejjieħ, jew il-
programmer, li trid

221
00:10:13,300 --> 00:10:15,745
toqgħod fuq l-ispallejn ta '
nies fil-passat bħalek,

222
00:10:15,745 --> 00:10:18,670
li stajt diġà dehret kif
li attwalment jikteb xi ħaġa isfel.

223
00:10:18,670 --> 00:10:20,650
U hekk dan iż-żmien,
pjuttost milli jgħidu li ejja

224
00:10:20,650 --> 00:10:22,255
attwalment jużaw screen tagħna matul hawn.

225
00:10:22,255 --> 00:10:24,130
Mela jekk inti tixtieq li pass
minn hawn, jien ser

226
00:10:24,130 --> 00:10:27,196
li jgħaddu mill-ġdid dan bħala
input lill ħabib printf tiegħi.

227
00:10:27,196 --> 00:10:29,320
Jekk inti tista 'tmur quddiem u
jistampaw li fuq l-iskrin,

228
00:10:29,320 --> 00:10:31,611
sempliċiment billi tpinġija bil tiegħek
swaba fuq l-iskrin iswed.

229
00:10:31,611 --> 00:10:43,680

230
00:10:43,680 --> 00:10:44,180
Eċċellenti.

231
00:10:44,180 --> 00:10:47,350
Kull dritt, lottijiet ta 'suspense għall-bqija
kif dak kien se play out.

232
00:10:47,350 --> 00:10:51,390
>> Allura issa ejja jieħdu l-affarijiet up wieħed
talja finali, jekk nistgħu, kif ġej.

233
00:10:51,390 --> 00:10:53,980
Allura dan huwa programm C
kif aħna qal aħħar darba.

234
00:10:53,980 --> 00:10:57,460
U dan biss ma dak li għamilt, dan
prints out għall-iskrin, hello, dinja.

235
00:10:57,460 --> 00:11:00,290
Anki jekk hemm b'mod ċar ħafna
għalf ta 'jfixkluh up hemm.

236
00:11:00,290 --> 00:11:03,630
Imma ejja jieħdu l-affarijiet up a talja u
jintroduċu din il-verżjoni, li tfakkar

237
00:11:03,630 --> 00:11:06,160
kienet it-tielet verżjoni li
aħna spiċċajna bi aħħar darba.

238
00:11:06,160 --> 00:11:09,120
>> U issa hemm b'mod ċar
żewġ użi ta 'printf.

239
00:11:09,120 --> 00:11:12,280
Hemm 2 sejħiet għall Alana
f'dan il-każ għall printf,

240
00:11:12,280 --> 00:11:14,740
imma hemm ukoll sejħa
lil funzjoni oħra.

241
00:11:14,740 --> 00:11:17,150
X'hemm dik il-funzjoni b'mod ċar?

242
00:11:17,150 --> 00:11:17,650
Getstring.

243
00:11:17,650 --> 00:11:18,980
>> Nistgħu tikseb wieħed voluntier aktar?

244
00:11:18,980 --> 00:11:20,980
OK, come fuq up.

245
00:11:20,980 --> 00:11:21,805
X'hemm isem tiegħek?

246
00:11:21,805 --> 00:11:22,990
>> JAVIER: Javier.

247
00:11:22,990 --> 00:11:24,750
>> DAVID Malan: Javier, come fuq up.

248
00:11:24,750 --> 00:11:27,270
Allura rwol Javier hu fuq
din il-biċċa ta 'karta.

249
00:11:27,270 --> 00:11:28,860
Liema Jien ser sejħa ġenerikament s.

250
00:11:28,860 --> 00:11:32,250
Issa dan huwa varjabbli, huwa
ta 'spag tip, kif implikat

251
00:11:32,250 --> 00:11:34,290
billi dan it-tieni linja fin-nofs hemm.

252
00:11:34,290 --> 00:11:36,540
U nixtieq li inti tmur tikseb me string.

253
00:11:36,540 --> 00:11:40,120
Speċifikament ras stabbiliti għall-orkestra
taqsima u nikseb me l-isem ta 'xi ħadd,

254
00:11:40,120 --> 00:11:43,142
u terga 'lura ma' varjabbli
fihom dak il-valur.

255
00:11:43,142 --> 00:11:44,225
Hija tista 'tkun xi ħadd inti tixtieq.

256
00:11:44,225 --> 00:11:47,590

257
00:11:47,590 --> 00:11:48,520
>> Here we go.

258
00:11:48,520 --> 00:11:53,620

259
00:11:53,620 --> 00:11:55,960
Kull dritt, Javier huwa
kitba l-isem.

260
00:11:55,960 --> 00:12:02,210

261
00:12:02,210 --> 00:12:03,280
Kull dritt.

262
00:12:03,280 --> 00:12:05,740
Aħna kollha jistgħu probabbilment raden kif
dan se play out.

263
00:12:05,740 --> 00:12:07,489
Aħna qed forsi belaboring
il-punt ta 'dak

264
00:12:07,489 --> 00:12:10,320
funzjoni hija tagħmel, imma
madankollu nirringrazzjak ħafna.

265
00:12:10,320 --> 00:12:13,890
>> Allura Javier marret lura din is-sekwenza
hawnhekk, li, ma tistax pjuttost tara,

266
00:12:13,890 --> 00:12:15,800
Jonathan huwa l-sekwenza
li konna gotten.

267
00:12:15,800 --> 00:12:18,330
Allura issa dak li jien attwalment għaddejjin
biex jipprovdu lill Alana għalkemm

268
00:12:18,330 --> 00:12:20,150
hija xi ftit differenti.

269
00:12:20,150 --> 00:12:23,800
Minħabba f'dan il-verżjoni tal-
programm, l-ewwel hemm jiddikjaraw l-isem tiegħek.

270
00:12:23,800 --> 00:12:26,160
Allura l-ewwel argument
I bżonn li jipprovdu Alana

271
00:12:26,160 --> 00:12:33,030
ma se tkun
litteralment jiddikjaraw l-isem tiegħek.

272
00:12:33,030 --> 00:12:35,280
Kull dritt, tant sempliċi bħal dik
Nixtieq idejn dan lilek.

273
00:12:35,280 --> 00:12:36,730
U kif I write up tal-
argument jmiss, jekk inti

274
00:12:36,730 --> 00:12:39,230
tixtieq li tmur quddiem u tikteb din
fuq il-bord, ejja imorru quddiem

275
00:12:39,230 --> 00:12:42,659
u jagħmlu l-eżempju finali hawn biex jagħmlu
ċar x'inhu finalment qbilna li jiġri.

276
00:12:42,659 --> 00:12:44,450
Allura jiddikjaraw l-isem tiegħek,
tikteb lejn il-quċċata

277
00:12:44,450 --> 00:12:47,220
jekk inti ma mind, biss hekk li
għandna kamra għat-tieni linja waħda.

278
00:12:47,220 --> 00:12:52,890
Minħabba li l-aħħar ħaġa jien ser
li issa jagħtuk mhuwiex wieħed,

279
00:12:52,890 --> 00:12:57,220
iżda żewġ biċċiet tal-karti.

280
00:12:57,220 --> 00:12:58,074
>> Kull dritt.

281
00:12:58,074 --> 00:13:01,920
H-E-L-L-O virgola u imbagħad linja vojta.

282
00:13:01,920 --> 00:13:04,780
Allura dak li jien ser idejn Alana issa
hija xi ftit differenti.

283
00:13:04,780 --> 00:13:08,600
Mhux biss hija hi jkollna dan,
fejn Imla l-vojt tirrappreżenta

284
00:13:08,600 --> 00:13:12,050
li percent-- dak li kien l-
placeholder aħna kont qed tuża?

285
00:13:12,050 --> 00:13:13,890
Yeah, hekk mija s.

286
00:13:13,890 --> 00:13:16,530
Sadanittant jien ser jgħaddu
tagħha f'tieni argument, li

287
00:13:16,530 --> 00:13:19,290
huwa preċiżament dak Javier
miksuba mill Jonathan.

288
00:13:19,290 --> 00:13:20,534
>> So let me jagħtuk dawn iż-żewġ.

289
00:13:20,534 --> 00:13:22,575
Jekk inti tixtieq li, imorru quddiem
u print dak l-effett.

290
00:13:22,575 --> 00:13:25,660

291
00:13:25,660 --> 00:13:28,130
X'hemm finalment jiġri
issa jiġifieri, Alana darb'oħra

292
00:13:28,130 --> 00:13:29,410
qed jilgħab l-irwol ta 'printf.

293
00:13:29,410 --> 00:13:32,160
Javier kien playing
ir-rwol ta 'GetString.

294
00:13:32,160 --> 00:13:34,700
Allura li se jkun souvenir tiegħek.

295
00:13:34,700 --> 00:13:39,910
U finalment dak li qed jiġri, minkejja
dan hello-- Yep imorru quddiem u virgola.

296
00:13:39,910 --> 00:13:41,410
Alana: Did I jirċievu dan jew għadhom ebda?

297
00:13:41,410 --> 00:13:43,451
DAVID Malan: Yep, inti
riċevuta minnhom tnejn f'daqqa.

298
00:13:43,451 --> 00:13:45,740
Allura l-idea hija li inti
issa jistgħu flip-paġna

299
00:13:45,740 --> 00:13:50,000
biex jimmaniġġaw it-tieni
ta dawn iż-żewġ inputs.

300
00:13:50,000 --> 00:13:53,280
Allura dan huwa biss li martell-dar tal-
punt li filwaqt Alana esegwiti

301
00:13:53,280 --> 00:13:55,830
din il-linja ħadra hawn, u mbagħad
Javier għamlet dan wieħed għalina

302
00:13:55,830 --> 00:13:57,820
u r-ritorn lili xi ħaġa
aħna ser sejħa i, imma kien verament

303
00:13:57,820 --> 00:13:59,520
biss li biċċa karta ta 'tiegħu stess.

304
00:13:59,520 --> 00:14:02,320
U issa Alana għamlet din it-tielet linja.

305
00:14:02,320 --> 00:14:06,010
>> U anki jekk dan kollu jistenna
hekk oerhört cryptic forsi

306
00:14:06,010 --> 00:14:08,870
ewwel daqqa t'għajn, huwa verament
huwa sempliċi bħal dik.

307
00:14:08,870 --> 00:14:11,390
Tgħaddi inputs madwar,
jkollna outputs, jew

308
00:14:11,390 --> 00:14:14,560
qed fiżikament mogħtija lura xi ħaġa,
jew jara effett sekondarju bħal dan.

309
00:14:14,560 --> 00:14:17,170
Xi ħaġa viżwalment
miktub fuq l-iskrin.

310
00:14:17,170 --> 00:14:19,990
Mela ejja imorru quddiem u
nirringrazzja Alana u Javier,

311
00:14:19,990 --> 00:14:25,012
li kien jistabbilixxi hawn, għal
jingħaqdu magħna up here.

312
00:14:25,012 --> 00:14:25,934
>> [Applause]

313
00:14:25,934 --> 00:14:29,360

314
00:14:29,360 --> 00:14:33,480
>> Allura issa ejja jieħdu għal mogħtija kemm
sempliċi kollha ta 'li jista' jkun.

315
00:14:33,480 --> 00:14:36,775
U ejja tipproċedi biex attwalment
tagħmel xi ħaġa fil-kodiċi attwali.

316
00:14:36,775 --> 00:14:40,620
Allura up fuq l-iskrin hawnhekk hija screenshot
tal-hekk imsejħa appliance CS50.

317
00:14:40,620 --> 00:14:43,980
U jekk inti kellha fuq, bħala
02:00 nhar l-Erbgħa wara nofsinhar,

318
00:14:43,980 --> 00:14:46,602
jispjegaw xi wħud ħabib
dak l-appliance CS50 hija,

319
00:14:46,602 --> 00:14:48,185
kif kieku inti tiddefinixxi dan fil-sentenza?

320
00:14:48,185 --> 00:14:52,160

321
00:14:52,160 --> 00:14:53,240
Kwalunkwe sentenza waħda?

322
00:14:53,240 --> 00:14:54,876
Yeah?

323
00:14:54,876 --> 00:14:57,334
STUDENT: Huwa simili programm
li jagħmel il-kompjuter ta 'kulħadd

324
00:14:57,334 --> 00:14:58,460
mmexxija bl-istess sistema.

325
00:14:58,460 --> 00:14:59,210
DAVID Malan: Tajba!

326
00:14:59,210 --> 00:15:02,810
Huwa programm li tippermetti li kulħadd
kompjuter biex imexxu bl-istess sistema.

327
00:15:02,810 --> 00:15:04,920
Huwa tip ta 'tiegħek stess
kopja ta 'operattiva

328
00:15:04,920 --> 00:15:07,540
sistema li jiġri
jiġu msejħa Ubuntu Linux.

329
00:15:07,540 --> 00:15:11,070
U din tmur b'mod effettiv fi ħdan ta '
tieqa fuq Mac tiegħek stess jew PC,

330
00:15:11,070 --> 00:15:15,080
b'tali mod li dan il-mod id-dritt barra tal-bieb
fil-ġimgħa 1, kulħadd hawn fil-klassi

331
00:15:15,080 --> 00:15:17,590
ikollu aċċess għall-istess għodod,
l-istess konfigurazzjoni,

332
00:15:17,590 --> 00:15:21,250
u hemm ebda speċifiku kurva tat-tagħlim
għal Mac jew PC b'mod partikolari.

333
00:15:21,250 --> 00:15:25,620
>> Issa aħna miftuħa up, ġewwa tal-CS50
appliance nhar it-Tnejn, dan il-programm hawn.

334
00:15:25,620 --> 00:15:27,040
Dan jiġri li għandu jissejjaħ gedit.

335
00:15:27,040 --> 00:15:29,050
Imma dak li verament ftit
editur grafika.

336
00:15:29,050 --> 00:15:33,170
Hija xi ħaġa simili notepad jew Test
Edit fuq Windows jew Mac OS rispettivament.

337
00:15:33,170 --> 00:15:36,720
And I propost li kien hemm verament
tliet partijiet importanti għal dan l-iskrin.

338
00:15:36,720 --> 00:15:39,560
In-naħa ta 'fuq huwa fejn inti
se jikteb kodiċi tiegħek.

339
00:15:39,560 --> 00:15:44,080
U li fejn aħna jintefqu ħafna ta 'tagħna
tliet eżempji fil lecture nhar it-Tnejn.

340
00:15:44,080 --> 00:15:47,650
Il-bottom we called dak,
dan il-tieqa iswed, yeah?

341
00:15:47,650 --> 00:15:48,640
>> STUDENT: kompilatur?

342
00:15:48,640 --> 00:15:51,500
>> DAVID Malan: kompilatur aħna
aċċessata permezz ta 'dak tieqa.

343
00:15:51,500 --> 00:15:53,040
Iżda aktar ġenerali.

344
00:15:53,040 --> 00:15:54,540
Yeah, kien biss tieqa terminal.

345
00:15:54,540 --> 00:15:57,780
Dan huwa terminu antik età li biss
jiddeskrivi essenzjalment Teptip

346
00:15:57,780 --> 00:16:01,910
pront, li snin ilu użat biex tkun fuq
wieħed minn dawn il-monitors kbar stil CRT.

347
00:16:01,910 --> 00:16:04,300
Imma llum huwa tip
ta virtwali fis-software.

348
00:16:04,300 --> 00:16:06,710
U l-twieqi tat-terminal
Ejja us tip jikkmanda.

349
00:16:06,710 --> 00:16:11,750
Hija tip tal-verżjoni simplifikata
tal-interface utent jew UI.

350
00:16:11,750 --> 00:16:14,060
Mhuwiex grafika
interface utent jew GUI,

351
00:16:14,060 --> 00:16:17,250
huwa interface ibbażat fuq test
jew interface kmand tal-linja.

352
00:16:17,250 --> 00:16:20,770
>> U fil-fatt li fejn finalment
I kien kapaċi li jikteb xi kodiċi.

353
00:16:20,770 --> 00:16:24,200
Ladarba I kien kiteb xi kodiċi għalkemm,
ifakkar li I użat dan il-kmand.

354
00:16:24,200 --> 00:16:26,210
U kif l-isem
tip ta jissuġġerixxi, dan

355
00:16:26,210 --> 00:16:29,860
tippermetti lili biex tagħmel
programm imsejjaħ Hello.

356
00:16:29,860 --> 00:16:33,400
Imma dak li kien verament tagħmel?

357
00:16:33,400 --> 00:16:36,180
Ukoll make kienet qed tieħu tiegħi
input, kodiċi sors tiegħi,

358
00:16:36,180 --> 00:16:39,380
u dan jinbidel għal dak li, finalment?

359
00:16:39,380 --> 00:16:40,060
>> Object code.

360
00:16:40,060 --> 00:16:42,790
U l-kodiċi oġġett huwa biss fancy
mod ta 'tgħid żerijiet u dawk.

361
00:16:42,790 --> 00:16:46,420
U mbagħad darba xtaqt
biex imexxu dan il-kodiċi oġġett,

362
00:16:46,420 --> 00:16:50,940
ladarba jien ridt li jgħaddu bħala input dawk
żerijiet u dawk fis-kompjuter tiegħi

363
00:16:50,940 --> 00:16:54,430
moħħ, il-CPU hekk imsejħa
jew unità ċentrali ta 'pproċessar,

364
00:16:54,430 --> 00:16:55,730
I kellhom imexxu l-programm.

365
00:16:55,730 --> 00:16:59,042
Iżda dan ma kienx pjuttost sempliċi nhar it-Tnejn
bħala sempliċiment double tikklikkja ftit ikona.

366
00:16:59,042 --> 00:17:01,375
What minflok ma I jkollhom biex
jagħmlu sabiex tmexxi programm?

367
00:17:01,375 --> 00:17:04,130

368
00:17:04,130 --> 00:17:07,890
>> Liema kienet li t-tieni kmand?

369
00:17:07,890 --> 00:17:09,619
Jien smigħ slashes ftit?

370
00:17:09,619 --> 00:17:10,544
Iva, yeah?

371
00:17:10,544 --> 00:17:12,474
>> STUDENT: Dot mmejla u
isem tal-programm.

372
00:17:12,474 --> 00:17:13,349
DAVID Malan: Eżattament.

373
00:17:13,349 --> 00:17:15,030
Dot mmejla u l-isem tal-programm.

374
00:17:15,030 --> 00:17:16,210
Issa dak li ma jfisser dan?

375
00:17:16,210 --> 00:17:19,470
Well dot huwa biss mod arcane
ta 'tgħid direttorju kurrenti.

376
00:17:19,470 --> 00:17:23,440
Tkun xi tkun folder inti fil hija
referenzjati bħala, huwa rappreżentat bħala dot.

377
00:17:23,440 --> 00:17:26,680
Il slash huwa biss dak li inti stajt tidher
fil Mac OS u Windows għal snin,

378
00:17:26,680 --> 00:17:30,329
huwa separatur bejn direttorju
jew folder u l-bqija ta 'xi isem.

379
00:17:30,329 --> 00:17:32,620
Fil-Windows dan jiġri li jmorru
lura, fil-Linux u Mac

380
00:17:32,620 --> 00:17:34,210
OS dan jiġri li jmorru quddiem.

381
00:17:34,210 --> 00:17:37,560
Iżda huwa biss il-separatur, dan huwa
biss dettall sintattika uninteresting.

382
00:17:37,560 --> 00:17:40,440
>> Il-parti mmerraq tal-kors huwa
l-isem tal-programm, Hello.

383
00:17:40,440 --> 00:17:42,650
U dan huwa dak jagħmlu maħluqa għalina.

384
00:17:42,650 --> 00:17:44,910
Hija outputted dan il-fajl għalina.

385
00:17:44,910 --> 00:17:46,700
Imma kif ma nikbru dak il-punt?

386
00:17:46,700 --> 00:17:48,870
Ejja issa titlob lill-
kwistjoni, dak li kien verament

387
00:17:48,870 --> 00:17:52,470
għaddejjin hawn, għall-inqas ma '
rigward ta 'xi wħud minn dan sintassi?

388
00:17:52,470 --> 00:17:57,000
>> Allura f'sentenza jew hekk,
kif ma aħna jispjegaw bogħod

389
00:17:57,000 --> 00:17:59,020
dan l-ewwel linja li l-
enfasizzat fl-aħdar?

390
00:17:59,020 --> 00:18:02,998
Liema kienet l-ewwel linja li tagħmel,
fir-rigward programm tiegħi?

391
00:18:02,998 --> 00:18:03,974
Yeah?

392
00:18:03,974 --> 00:18:05,067
>> STUDENT: [inaudible].

393
00:18:05,067 --> 00:18:06,150
DAVID Malan: Say mill-ġdid?

394
00:18:06,150 --> 00:18:08,734
STUDENT: Inklużi u tniżżil
funzjonijiet tal-passat [inaudible].

395
00:18:08,734 --> 00:18:09,483
DAVID Malan: Tajba.

396
00:18:09,483 --> 00:18:11,900
Inklużi, I mhux se ngħid
tniżżil, imma ejja ngħidu

397
00:18:11,900 --> 00:18:15,500
inklużi funzjonijiet li n-nies
kitbu fil-passat.

398
00:18:15,500 --> 00:18:18,260
U dawk il-funzjonijiet jiġu implimentati
x'imkien fil-kompjuter tiegħi.

399
00:18:18,260 --> 00:18:20,470
Xi ħadd kiteb fajl
snin ilu, u dan il-fajl

400
00:18:20,470 --> 00:18:23,490
huwa x'imkien ġewwa tal-CS50
appliance, jew fuq hard drive tiegħi

401
00:18:23,490 --> 00:18:24,480
b'mod aktar ġenerali.

402
00:18:24,480 --> 00:18:27,810
U għalhekk din il-linja huwa essenzjalment qal,
mur isibu dan il-fajl, I standard / O dot

403
00:18:27,810 --> 00:18:31,740
h, u kopja u paste kontenut tiegħu
dritt hawn fuq il-quċċata tal-fajl tiegħi

404
00:18:31,740 --> 00:18:33,860
I hekk li ma jkollhom
tagħmel dan manwalment myself.

405
00:18:33,860 --> 00:18:40,970
>> U fost il-biċċiet juiciest ġewwa ta
dan il-fajl aħna mitluba kienet liema funzjoni?

406
00:18:40,970 --> 00:18:45,740
What funzjoni ma ngħidu kien iddikjarat
jew imsemmija fl-I standard / O dot h

407
00:18:45,740 --> 00:18:47,120
aktar probabbli?

408
00:18:47,120 --> 00:18:47,900
Printf, id-dritt?

409
00:18:47,900 --> 00:18:50,797
Aħna ma jiktbu printf fuq
It-Tnejn, hija biss teżisti.

410
00:18:50,797 --> 00:18:52,880
Ferm simili Alana biss daħal
up fuq il-palk u hi biss

411
00:18:52,880 --> 00:18:55,540
teżisti u kien jaf kif tfassal
xi ħaġa fuq l-iskrin,

412
00:18:55,540 --> 00:18:58,660
hekk ma printf jeżistu għal ħafna snin.

413
00:18:58,660 --> 00:19:00,240
U hekk dan huwa kif aħna jkollhom aċċess għaliha.

414
00:19:00,240 --> 00:19:03,280
Issa jekk aħna jimxu fuq hawn,
ewlieni kien analoga aħna

415
00:19:03,280 --> 00:19:06,620
qal li l-biċċa puzzle
imsejħa meta bandiera aħdar għafast

416
00:19:06,620 --> 00:19:07,620
fid-dinja ta 'Scratch.

417
00:19:07,620 --> 00:19:10,130
Huwa biss tip ta 'l-
isem default li l-bnedmin

418
00:19:10,130 --> 00:19:13,340
iddeċieda jirrappreżenta l-
default punt ta 'dħul għal programm.

419
00:19:13,340 --> 00:19:16,540
Il blokki ta 'kodiċi ta' programmazzjoni
li gets esegwiti ewwel.

420
00:19:16,540 --> 00:19:19,700
>> Sadanittant dawn braces kaboċċi huma
tip ta bħall-forma mgħawġa

421
00:19:19,700 --> 00:19:21,410
ta 'lott ta' dawk il-biċċiet scratch isfar.

422
00:19:21,410 --> 00:19:24,860
Huma tip ta jirrappreżentaw kollu
mazz ta 'struzzjonijiet flimkien.

423
00:19:24,860 --> 00:19:28,350
Allura hija biss tip ta 'torbot flimkien
xi funzjonalità relatati.

424
00:19:28,350 --> 00:19:33,750
printf tal-kors huwa funzjoni li
prints l-iskrin, kif aħna biss għamlet.

425
00:19:33,750 --> 00:19:35,190
>> What dwar dawn parentesi?

426
00:19:35,190 --> 00:19:38,770
Kif inti define-- anki jekk inti stajt
qatt programmati qabel, iżda biss ibbażat

427
00:19:38,770 --> 00:19:41,320
issa fuq tiżdied
intwizzjoni wieħed jittama, liema

428
00:19:41,320 --> 00:19:43,290
huma l-parentesi jagħmlu għalina hawn?

429
00:19:43,290 --> 00:19:45,450
Jew liema huma madwar?

430
00:19:45,450 --> 00:19:46,360
Yeah?

431
00:19:46,360 --> 00:19:49,360
>> STUDENT: Huma qed tgħid liema
int ser jistampaw bil printf.

432
00:19:49,360 --> 00:19:52,401
>> DAVID Malan: Yeah, dawn qed tgħid dak
int ser jistampaw bil printf.

433
00:19:52,401 --> 00:19:56,260
Jew b'mod iktar ġenerali, huma
jdawwar l-inputs għall-funzjoni.

434
00:19:56,260 --> 00:19:58,530
Allura inti tista 'kważi taħseb
ta 'dawk parentesi

435
00:19:58,530 --> 00:20:01,620
bħala bħall-metall
clip fuq din clipboard.

436
00:20:01,620 --> 00:20:05,940
Huwa x'hemm azjenda, huwa x'hemm
ser jintużaw biex jipprovdu argumenti

437
00:20:05,940 --> 00:20:08,500
fil-funzjoni, li
F'dan il-każ huwa msejjaħ printf.

438
00:20:08,500 --> 00:20:12,390
>> Allura b'mod ġenerali kważi kull
ħin nitolbu funzjoni,

439
00:20:12,390 --> 00:20:14,280
aħna ser tara parentesi par.

440
00:20:14,280 --> 00:20:17,000
Forsi ma 'xi ħaġa fiha,
bħal issa, forsi xejn fiha.

441
00:20:17,000 --> 00:20:19,770
Imma dak li fejn inti tpoġġi
l-inputs jew hekk imsejħa argumenti

442
00:20:19,770 --> 00:20:20,680
għal funzjoni.

443
00:20:20,680 --> 00:20:22,470
>> Hawn argument wieħed bħal dawn.

444
00:20:22,470 --> 00:20:24,467
Stajt enfasizzat kollox
bejn il-kwotazzjonijiet,

445
00:20:24,467 --> 00:20:26,300
għaliex jirriżulta
f'din il-lingwa imsejħa

446
00:20:26,300 --> 00:20:29,950
C, meta inti tixtieq li tirrappreżenta
string-- li hija kelma jew frażi

447
00:20:29,950 --> 00:20:33,470
jew saħansitra paragraph-- għandek
madwaru ma kwotazzjonijiet doppja.

448
00:20:33,470 --> 00:20:35,420
Kwotazzjonijiet Mhux wieħed, kwotazzjonijiet doppja.

449
00:20:35,420 --> 00:20:37,460
U dan huwa eżattament dak I ghamilt hawn.

450
00:20:37,460 --> 00:20:39,900
>> Sadanittant hemm funky
simbolu lejn it-tmiem hemmhekk.

451
00:20:39,900 --> 00:20:41,600
Il n backslash.

452
00:20:41,600 --> 00:20:43,460
What did aħna ngħidu li irrappreżentata?

453
00:20:43,460 --> 00:20:44,093
Yeah?

454
00:20:44,093 --> 00:20:44,980
>> STUDENT: A linja ġdida.

455
00:20:44,980 --> 00:20:45,896
>> DAVID Malan: Linja Ġdid.

456
00:20:45,896 --> 00:20:47,910
Dritt, inti ma
ġeneralment hit Ikteb meta

457
00:20:47,910 --> 00:20:50,430
trid li l-programm
bżiq out linja ġdida.

458
00:20:50,430 --> 00:20:54,210
Pjuttost inti tgħid b'mod espliċitu
ma din il-biċċa ċertament arcane

459
00:20:54,210 --> 00:20:58,770
ta sintassi, backslash n, li
inti tixtieq linja ġdida li jmorru hemm.

460
00:20:58,770 --> 00:20:59,810
Fl-aħħarnett l-virgola.

461
00:20:59,810 --> 00:21:01,560
Aħna ma verament jitkellmu
wisq dwar dan,

462
00:21:01,560 --> 00:21:04,893
u bil-bosta dan se jkun l-bane ta 'xi
tal-eżistenza tiegħek għall-ewwel problema

463
00:21:04,893 --> 00:21:07,990
sett, meta inti biss naqset li tirrealizza
inti stajt minsija xi ħaġa bħala stupid

464
00:21:07,990 --> 00:21:08,614
bħala virgola.

465
00:21:08,614 --> 00:21:11,600
U ġeneralment tqegħid
se jiffissaw hemm dik il-problema.

466
00:21:11,600 --> 00:21:13,511
Imma x'hemm dan isir
għalina, would you say?

467
00:21:13,511 --> 00:21:15,670
>> STUDENT: [inaudible].

468
00:21:15,670 --> 00:21:17,484
>> DAVID Malan: Jiddispjacini?

469
00:21:17,484 --> 00:21:18,532
>> STUDENT: [inaudible].

470
00:21:18,532 --> 00:21:19,990
DAVID Malan: Irfinar dikjarazzjoni.

471
00:21:19,990 --> 00:21:22,770
Huwa tip ta bħall-perjodu fuq
l-aħħar ta 'sentenza Ingliża,

472
00:21:22,770 --> 00:21:25,790
billi f'din il-lingwa
C huwa jispiċċa dikjarazzjoni.

473
00:21:25,790 --> 00:21:29,250
L-istruzzjoni ta 'programmazzjoni
kodiċi li inti biss jridu jgħidu,

474
00:21:29,250 --> 00:21:30,500
Jien jsir ma 'dan.

475
00:21:30,500 --> 00:21:32,240
Issa avviż li l-uniku wieħed hawn.

476
00:21:32,240 --> 00:21:34,614
Allura inti ma tridx li tikseb fl
drawwa ta 'semicolons tqegħid

477
00:21:34,614 --> 00:21:36,190
wara kull parentesi magħluqa.

478
00:21:36,190 --> 00:21:38,610
Per eżempju hemm xejn
jmiss null, u aħna ser

479
00:21:38,610 --> 00:21:40,430
terga 'lura fil-futur
għal dak mezzi null.

480
00:21:40,430 --> 00:21:44,080
Iżda f'dan il-każ printf tiegħek huwa
funzjoni, jew dikjarazzjoni qed jintużaw,

481
00:21:44,080 --> 00:21:47,420
u hekk aħna tixtieq li jkollok li
terminus fl-aħħar nett ta 'dan.

482
00:21:47,420 --> 00:21:50,980
>> U jien intenzjonalment picking fuq C. U
franchement ħafna ta 'lingwi bħal C, C ++

483
00:21:50,980 --> 00:21:55,000
Java, JavaScript, u ​​kull numru ta '
f'ilsna oħra għandhom ħafna ta 'dawn

484
00:21:55,000 --> 00:21:56,730
tip ta 'dettalji sintattika.

485
00:21:56,730 --> 00:22:00,120
Li ċertament jekk int ġodda biex
programmazzjoni jistgħu ġenwinament vjaġġ inti up.

486
00:22:00,120 --> 00:22:02,307
U int se, jimmarkaw tiegħi
kliem, xi wħud minnkom se

487
00:22:02,307 --> 00:22:04,140
jkollhom din l-esperjenza
fil-ħinijiet uffiċċju jew tard

488
00:22:04,140 --> 00:22:07,554
bil-lejl jaħdmu fuq xi p-set, fejn
program kkritikat tiegħek biss ma tiġborx,

489
00:22:07,554 --> 00:22:09,470
ma tmurx, inti għandek
ebda idea x'hemm ħażin,

490
00:22:09,470 --> 00:22:11,513
jidher kompletament
loġikament korretta għalik.

491
00:22:11,513 --> 00:22:13,596
U huwa għaliex inti nesa
xi ħaġa bħal laqtu

492
00:22:13,596 --> 00:22:15,250
semicolon fl-aħħar ta 'xi linja.

493
00:22:15,250 --> 00:22:17,590
>> Iżda dawn huma t-tipi ta 'affarijiet int
ser jitgħallmu immedjatament biex tara.

494
00:22:17,590 --> 00:22:20,048
U fil-fatt dawn huma l-affarijiet
li u TF tal-CA jkollhom

495
00:22:20,048 --> 00:22:23,210
ġie tip ta imħarrġa biex tara
ħafna aktar malajr milli suppost.

496
00:22:23,210 --> 00:22:26,610
U hekk dan huwa biss li jgħidu, kif inti
adsa fis-problema stabbilixxa l-1 speċjalment,

497
00:22:26,610 --> 00:22:28,217
ma jsibux frustrati minn dan il-għalf.

498
00:22:28,217 --> 00:22:30,050
Ladarba inti tip ta 'aklimatizza
għad-dinja, inti

499
00:22:30,050 --> 00:22:35,130
tibda tara affarijiet li inti tista 'ma
tara ewwel daqqa t'għajn din l-ewwel ġimgħa.

500
00:22:35,130 --> 00:22:37,440
>> Allura kodiċi sors hija xi ħaġa bħal dik.

501
00:22:37,440 --> 00:22:40,370
Aħna rridu li għaddih fil
l-hekk imsejħa kompilatur.

502
00:22:40,370 --> 00:22:42,850
U li kompilatur bħala
għidna jipprovdi output

503
00:22:42,850 --> 00:22:45,660
magħrufa bħala kodiċi oġġett, il-
żerijiet u dawk hekk imsejħa.

504
00:22:45,660 --> 00:22:47,747
Iżda minn hemm, dak li ma tagħtina?

505
00:22:47,747 --> 00:22:49,080
Ukoll huwa jagħtina dawn it-tendenzi.

506
00:22:49,080 --> 00:22:52,020
U għal darb'oħra kompjuter tiegħek,
Intel tiegħek ġewwa,

507
00:22:52,020 --> 00:22:54,350
jifhem dawn it-tendenzi
ta 'żerijiet u dawk.

508
00:22:54,350 --> 00:22:57,300
U xi kultant l-mudell
jirrappreżenta numru deċimali attwali

509
00:22:57,300 --> 00:22:59,770
kif rajna aħħar ġimgħa, xi kultant
dan jirrappreżenta ittra

510
00:22:59,770 --> 00:23:02,730
bħal rajna aħħar ġimgħa, xi kultant
dan jirrappreżenta istruzzjoni,

511
00:23:02,730 --> 00:23:05,460
bħal istampar xi ħaġa li l-iskrin.

512
00:23:05,460 --> 00:23:08,782
>> Allura printf għall instance--
iżda pjuttost, let me kontrina.

513
00:23:08,782 --> 00:23:11,240
Imxejna ilhom jieħdu għall mogħtija
li dawk żerijiet u dawk li huma

514
00:23:11,240 --> 00:23:14,200
prodotta minn dan il-kmand make.

515
00:23:14,200 --> 00:23:16,050
Imma kun mhix kompilatur.

516
00:23:16,050 --> 00:23:19,370
Agħmel mhuwiex il-ħaġa fin-nofs
thats tipproduċi l-żerijiet u dawk.

517
00:23:19,370 --> 00:23:23,780
Pjuttost tagħmel huwa biss konvenjenti ħafna
programm jismu li l-iskop fil-ħajja

518
00:23:23,780 --> 00:23:27,267
huwa essenzjalment biex insemmu
kif jikkompilaw program tiegħek.

519
00:23:27,267 --> 00:23:29,350
U nużawha f'dawn
ewwel ġimgħat għaliex hija biss

520
00:23:29,350 --> 00:23:30,910
jiffranka us ħafna problemi.

521
00:23:30,910 --> 00:23:34,080
>> Imma dak li jagħmlu huwa verament
tagħmel meta inti tiġbor hello,

522
00:23:34,080 --> 00:23:36,690
hija, kif aħna qal aħħar darba, huwa
tfittex fuq hard drive tiegħek

523
00:23:36,690 --> 00:23:40,620
jew fil-folder attwali, għal
fajl imsejħa dak, apparentement?

524
00:23:40,620 --> 00:23:41,815
Hello.c, id-dritt?

525
00:23:41,815 --> 00:23:43,190
Li jinsab biss tip ta 'konvenzjoni.

526
00:23:43,190 --> 00:23:45,620
Huwa arbitrarja, iżda
li l-mod l-affarijiet huma.

527
00:23:45,620 --> 00:23:48,620
Agħmel, jekk inti biss tispeċifika l-isem
ta 'programm li għadha ma teżistix,

528
00:23:48,620 --> 00:23:52,200
li għaddej biex tfittex għall-kodiċi sors
fil-fajl, fil-kontumaċja mezzi hello.c.

529
00:23:52,200 --> 00:23:53,530
U jekk isibha, kbir.

530
00:23:53,530 --> 00:23:56,650
Huwa ser jikkonvertu dak is-sors
kodiċi fis object code għalik.

531
00:23:56,650 --> 00:23:59,670
>> Imma kull darba stajt hit Ikteb
wara running jagħmlu hello,

532
00:23:59,670 --> 00:24:03,560
Tiftakar tara l-aħħar darba
pjuttost twil u s-sekwenza cryptic

533
00:24:03,560 --> 00:24:06,430
ta 'ittri abjad ieħor u
karattri fuq l-iskrin?

534
00:24:06,430 --> 00:24:11,220
Ukoll li kien l-kmand attwali, il-
kompilatur attwali, li kien għaddej.

535
00:24:11,220 --> 00:24:15,500
Allura l-kumpilatur attwali aħna ser tuża aktar ta '
l-semestru hija xi ħaġa imsejħa clang.

536
00:24:15,500 --> 00:24:19,280
Xi wħud minnkom jista 'jkollok użati
Visual Studio qabel, jew GCC,

537
00:24:19,280 --> 00:24:21,340
jew kwalunkwe numru ta 'kompilaturi oħra.

538
00:24:21,340 --> 00:24:22,620
Aħna ser tuża clang.

539
00:24:22,620 --> 00:24:26,950
>> U clang jippermetti li attwalment jikkonvertu
dan il-kodiċi sors li toġġezzjona kodiċi.

540
00:24:26,950 --> 00:24:29,430
X'jagħmel din attwalment
tfisser fil-prattika?

541
00:24:29,430 --> 00:24:33,390
Well let me go f'waħda minn
folders tiegħi mill-aħħar darba.

542
00:24:33,390 --> 00:24:35,760
Ġewwa tal-appliance CS50.

543
00:24:35,760 --> 00:24:42,080
U let me imorru quddiem u joħolqu din
istess fajl, jinkludu standard I / O dot h.

544
00:24:42,080 --> 00:24:42,875
Null prinċipali Int.

545
00:24:42,875 --> 00:24:46,000
U aħna ser terga 'lura fil-futur bħala
għal dak li int mezzi u liema mezzi null.

546
00:24:46,000 --> 00:24:49,130
Iżda għal issa ejja do
bonjour backslash dinja n,

547
00:24:49,130 --> 00:24:50,500
bħad għamilna fuq il-bord.

548
00:24:50,500 --> 00:24:53,930
>> Let me tiffranka dan il-fajl imsejħa hello.c.

549
00:24:53,930 --> 00:24:58,280
U issa jekk irrid li jiġbor dan
I could-- let me zoom run in--

550
00:24:58,280 --> 00:25:00,450
jagħmlu bonjour jidħol.

551
00:25:00,450 --> 00:25:02,645
U dan kien għal darb'oħra
dik il-linja cryptic ħafna.

552
00:25:02,645 --> 00:25:05,120
Imma kelma issa mill-inqas wieħed
probabbilment jumps fil inti.

553
00:25:05,120 --> 00:25:07,087
Clang hija dik il-linja rajna qabel.

554
00:25:07,087 --> 00:25:10,420
Issa hemm ħafna ta 'għalf ieħor franchement
li aħna ser mewġa idejn tagħna fuq għal-lum.

555
00:25:10,420 --> 00:25:14,020
Iżda hemm sottogruppi ftit,
ftit karattri fil hawn

556
00:25:14,020 --> 00:25:14,907
li huma ta 'interess.

557
00:25:14,907 --> 00:25:16,490
Imma jien ser jimxi 'l quddiem u jagħmlu dan.

558
00:25:16,490 --> 00:25:18,281
Jien ser ewwel ġirja
hello, just biex jipprova

559
00:25:18,281 --> 00:25:20,320
li dan qed taħdem kif kien it-Tnejn.

560
00:25:20,320 --> 00:25:22,330
Imma issa jien ser tħassar il-programm.

561
00:25:22,330 --> 00:25:25,870
U ħafna bħal kellna dawn
ismijiet qasir aħħar darba,

562
00:25:25,870 --> 00:25:29,787
il-kmand għat-tneħħija
xi ħaġa hija rm, neħħi, jidħol.

563
00:25:29,787 --> 00:25:31,870
Inti qed tmur biex tikseb xi
mistoqsijiet pjuttost cryptic.

564
00:25:31,870 --> 00:25:35,210
Hard biex jemmnu li inti tista 'tagħmel
anki din il-kwistjoni diffiċli biex jifhmu.

565
00:25:35,210 --> 00:25:38,100
Iżda neħħi bonjour fajl regolari biss
mezzi do inti tixtieq li tħassar bonjour.

566
00:25:38,100 --> 00:25:42,650
>> And I tista 'tmur quddiem u t-tip y għal
iva, Ikteb, u issa marret.

567
00:25:42,650 --> 00:25:45,130
X'inhu dan ifisser issa,
jekk I ċar l-iskrin tiegħi,

568
00:25:45,130 --> 00:25:47,301
hija li minflok
tagħmel tagħmel hello-- inti

569
00:25:47,301 --> 00:25:48,800
taf liema, jien jkollna tajba fuq dan.

570
00:25:48,800 --> 00:25:50,690
Jien ser imexxu l-kompilatur myself.

571
00:25:50,690 --> 00:25:53,330
I m'għandhomx bżonn xi programm biex
ċifra barra dak file tiegħi huwa msejjaħ.

572
00:25:53,330 --> 00:25:55,370
I kiteb hello.c, I
jafu liema huwa msejjaħ,

573
00:25:55,370 --> 00:25:57,640
Jien b'mod ċar li jista 'ittajpjar dak.

574
00:25:57,640 --> 00:26:02,620
So I m ser jimxi 'l quddiem
u ma clang hello.c Ikteb.

575
00:26:02,620 --> 00:26:03,264
>> Jidher li qed jaħdem.

576
00:26:03,264 --> 00:26:05,930
U hemm l-ebda output addizzjonali,
minħabba clang huwa l-kumpilatur.

577
00:26:05,930 --> 00:26:08,590
Huwa x'hemm konverżjoni tal-
kodiċi tas-sors għall-żerijiet u dawk.

578
00:26:08,590 --> 00:26:12,870
Mela jekk jien issa do dot
mmejla bonjour Ikteb, hm.

579
00:26:12,870 --> 00:26:14,630
Messaġġ ġdid żball llum.

580
00:26:14,630 --> 00:26:17,610
Allura bash huwa biss l-isem tal-
Teptip fil-pront li aħna qed tuża.

581
00:26:17,610 --> 00:26:20,360
Li l-oversimplification gross,
iżda għal issa li kollox jiġifieri,

582
00:26:20,360 --> 00:26:21,401
huwa l-pront Teptip.

583
00:26:21,401 --> 00:26:22,880
U hu għalhekk li huwa yelling fil us.

584
00:26:22,880 --> 00:26:25,690
>> Nru tali file jew direttorju huwa
ftit aktar sempliċi.

585
00:26:25,690 --> 00:26:28,190
Iżda żgur I magħmula dan il-kodiċi oġġett.

586
00:26:28,190 --> 00:26:30,930
Iżda l-qabda hija, li
jekk I tip-kmand

587
00:26:30,930 --> 00:26:34,650
biex jelenkaw il-kontenut ta 'dan
direttorju, li huwa dak?

588
00:26:34,650 --> 00:26:36,210
ls għall-lista.

589
00:26:36,210 --> 00:26:39,332
Hemm mazz ta 'għalf fil hawn,
li wħud minnhom daħal mal-appliance,

590
00:26:39,332 --> 00:26:42,040
bħal folder Desktop tiegħi, Downloads
folder, folder Dropbox, u kollha

591
00:26:42,040 --> 00:26:42,850
li Jittieħed.

592
00:26:42,850 --> 00:26:45,410
Imma dak li hu interessanti
huwa hello.c, li

593
00:26:45,410 --> 00:26:47,286
I ħolqot mument ilu ma gedit.

594
00:26:47,286 --> 00:26:49,160
U x'inhu l-weirdest
tfittex isem fil hawn,

595
00:26:49,160 --> 00:26:53,110
forsi li aħna ma
ara l-aħħar ħin kollu?

596
00:26:53,110 --> 00:26:54,710
>> a.out, id-dritt?

597
00:26:54,710 --> 00:26:56,920
Allura lura fil-ġurnata, huwa
li kien biss iddeċieda meta

598
00:26:56,920 --> 00:26:58,760
inti tikkompila programm
għall-ewwel darba,

599
00:26:58,760 --> 00:27:02,360
u inti ma tispeċifika l-isem
ta 'fajl, ejja sejħa hija.

600
00:27:02,360 --> 00:27:05,800
U a.out ifisser biss dan kien
l-output tal-kompilatur.

601
00:27:05,800 --> 00:27:07,790
Allura huwa isem horrible għal programm.

602
00:27:07,790 --> 00:27:12,820
Iżda billi li l-loġika, dot mmejla għal
direttorju kurrenti, mmejla a.out,

603
00:27:12,820 --> 00:27:16,102
għandu jfisser hemm fil-fatt
tiegħi bonjour programm dinja.

604
00:27:16,102 --> 00:27:17,560
Issa ftit tisħon eżerċizzju, wisq.

605
00:27:17,560 --> 00:27:20,420
Jekk irrid li tibdel isem din
fajl, jirriżulta li inti

606
00:27:20,420 --> 00:27:23,000
jimxu fajl mill-isem wieħed għall-ieħor.

607
00:27:23,000 --> 00:27:28,750
A.out Allura mv, u mbagħad I
tista 'sejħa hija bonjour Ikteb.

608
00:27:28,750 --> 00:27:30,940
Allura dan huwa kmand Linux.

609
00:27:30,940 --> 00:27:34,370
DOS kellhom din snin ilu,
Windows għandu tieqa terminal

610
00:27:34,370 --> 00:27:36,460
ta 'xi tip li jistenna
bħal dan, Linux u Mac

611
00:27:36,460 --> 00:27:38,140
kompjuters għandhom dan Teptip fil-pront.

612
00:27:38,140 --> 00:27:41,490
Anke jekk ħafna minna probabbilment
rarament, jekk qatt, tużah.

613
00:27:41,490 --> 00:27:44,590
>> Imma dak I ghamilt huwa mmexxi
programm, li ismu huwa mv,

614
00:27:44,590 --> 00:27:47,900
u stajt sakemm dan ma
żewġ argumenti, biex ngħidu hekk.

615
00:27:47,900 --> 00:27:48,630
Żewġ inputs.

616
00:27:48,630 --> 00:27:50,260
a.out huwa l-isem oriġinali.

617
00:27:50,260 --> 00:27:51,630
Hello huwa l-isem il-ġdid.

618
00:27:51,630 --> 00:27:55,670
Mela jekk jien issa do dot mmejla
hello, Ikteb, li jeżisti.

619
00:27:55,670 --> 00:28:00,770
U jekk I do a.out dot mmejla,
dak li tistenna I tara?

620
00:28:00,770 --> 00:28:02,250
>> Bash, ebda tali file jew direttorju.

621
00:28:02,250 --> 00:28:03,350
Minħabba I biss semmieh.

622
00:28:03,350 --> 00:28:04,975
Allura dan jieħu daqsxejn ta 'jkollna użati biex.

623
00:28:04,975 --> 00:28:06,977
Iżda l-problema stabbilixxa l-1
ispeċifikazzjoni ser verament

624
00:28:06,977 --> 00:28:08,810
żżomm f'idejk permezz
xi ftit minn din minutae.

625
00:28:08,810 --> 00:28:11,050
Minħabba li dan huwa kompleta
distrazzjoni intellettwali

626
00:28:11,050 --> 00:28:12,966
mill-aktar interessanti
ideat fil-idejn, li

627
00:28:12,966 --> 00:28:15,310
huwa attwalment joħolqu
xi ħaġa ta 'kodiċi.

628
00:28:15,310 --> 00:28:18,830
Imma ejja do modifika waħda
issa biex dan il-programm.

629
00:28:18,830 --> 00:28:23,150
>> Ifakkar li l-aħħar darba għamilt xi ħaġa
bħal dan, printf jiddikjaraw l-isem tiegħek.

630
00:28:23,150 --> 00:28:25,790
U fil-fatt aħna biss ma dan
fuq il-big screen hemmhekk.

631
00:28:25,790 --> 00:28:30,640
U mbagħad I ma string s gets
GetString paren miftuħa, paren qrib.

632
00:28:30,640 --> 00:28:33,430
U paren biss shorthand
notazzjoni għall parentesi.

633
00:28:33,430 --> 00:28:36,460
Allura ma GetString tieħu ebda argument?

634
00:28:36,460 --> 00:28:38,440
Ebda inputs ebda, iżda
teħtieġ l-parentesi,

635
00:28:38,440 --> 00:28:41,830
għaliex dan huwa dak tiddemarka
l-sejħa ta 'funzjoni.

636
00:28:41,830 --> 00:28:46,440
>> So jien ser jimxi 'l quddiem u jippruvaw
imexxu l-kumpilatur fuq dan il-programm issa.

637
00:28:46,440 --> 00:28:50,774
Hello.c Clang, minħabba I
ma biddlitx l-isem tagħha għal issa.

638
00:28:50,774 --> 00:28:51,940
U sibt mazz ta 'żbalji.

639
00:28:51,940 --> 00:28:53,570
Ejja zoom out here.

640
00:28:53,570 --> 00:28:55,420
Jekk I iscroll up again,
bħal I said aħħar darba,

641
00:28:55,420 --> 00:28:58,420
l-ewwel, l-istess żball
li sibt aħħar darba.

642
00:28:58,420 --> 00:29:04,210
On-line 6 ta hello.c kelli
string identifikatur mhux iddikjarat,

643
00:29:04,210 --> 00:29:05,590
ma I tfisser standard fil?

644
00:29:05,590 --> 00:29:06,750
I ma.

645
00:29:06,750 --> 00:29:10,050
Minħabba dak żball jkollhom I magħmula f'din
programm, jekk inti recall minn aħħar darba?

646
00:29:10,050 --> 00:29:13,219

647
00:29:13,219 --> 00:29:15,010
Yeah, għandna bżonn l-
hekk imsejħa roti taħriġ

648
00:29:15,010 --> 00:29:16,510
li aħna ser tuża biss għal ftit ġimgħat.

649
00:29:16,510 --> 00:29:19,480
Imma I bżonn li jiġi speċifikat li wkoll,
x'imkien ġewwa tal-appliance,

650
00:29:19,480 --> 00:29:22,720
huwa fajl li aħna kiteb
biss ftit snin ilu.

651
00:29:22,720 --> 00:29:26,500
Ġewwa minnhom huma funzjonijiet
bħal apparentament GetString.

652
00:29:26,500 --> 00:29:35,160
Allura issa jekk immur lura stabbiliti hawn,
zoom fi, u hello.c clang run mill-ġdid.

653
00:29:35,160 --> 00:29:36,500
Indanna, żball ieħor.

654
00:29:36,500 --> 00:29:38,590
Iżda aħna ma bbenefikawx dan wieħed qabel.

655
00:29:38,590 --> 00:29:41,900
>> Dan wieħed huwa ftit aktar
esoteric biex insemmu.

656
00:29:41,900 --> 00:29:46,910
Iżda din hija deliberatament fuq l-iskrin,
għaliex ridna li tgħid din l-istorja.

657
00:29:46,910 --> 00:29:51,280
Meta inti tikkompila hello.c, eżatt kif
l-istampa minn ssuġġerit qabel,

658
00:29:51,280 --> 00:29:54,650
int biss konverżjoni li
kodiċi tas-sors għall-żerijiet u dawk.

659
00:29:54,650 --> 00:30:00,340
Issa persunal CS50 ftit snin ilu kiteb
CS50.h, u fajl korrispondenti,

660
00:30:00,340 --> 00:30:01,640
CS50.c.

661
00:30:01,640 --> 00:30:04,490
U aħna, ftit snin ilu,
kkompilata dawn il-fajls

662
00:30:04,490 --> 00:30:07,290
fis-fajl li jiġri
li għandu jissejjaħ CS50.o.

663
00:30:07,290 --> 00:30:09,180
>> Jew jista 'jkun isem ġdid ta'
ftit affarijiet differenti.

664
00:30:09,180 --> 00:30:11,054
Imma dak mod sempliċi
ta 'ħsieb dwar dan.

665
00:30:11,054 --> 00:30:14,960
Allura aħna ikkumpilata l CS50
librerija fis żerijiet u dawk.

666
00:30:14,960 --> 00:30:20,340
Imma mkien jiena speċifikati
li nixtieq li jikkombinaw zeroes tiegħi

667
00:30:20,340 --> 00:30:24,030
u dawk għall-dinja bonjour tiegħi
programm ma 'l-żerijiet u dawk

668
00:30:24,030 --> 00:30:29,760
li l-persunal CS50 ħoloq ftit snin
ilu fis programm sħiħ wieħed.

669
00:30:29,760 --> 00:30:34,100
All I ve speċifikat mill-kitba
hello.c clang huwa jikkompilaw hello.c.

670
00:30:34,100 --> 00:30:38,380
>> Stajt ma qallek clang biex
link fil-żerijiet u dawk

671
00:30:38,380 --> 00:30:41,650
li l-persunal CS50 maħluqa
għalik xi żmien ilu.

672
00:30:41,650 --> 00:30:48,280
Allura huwa jiffissaw faċli,
sing l għal link, CS50.

673
00:30:48,280 --> 00:30:52,600
U aħna ser darb'oħra tara dan
qabel twil darb'oħra u għal darb'oħra.

674
00:30:52,600 --> 00:30:54,420
Imma avviż issa ma kien hemm l-ebda ilmenti.

675
00:30:54,420 --> 00:30:59,770
Allura issa jekk I run dot mmejla
hello, issa huwa xogħol.

676
00:30:59,770 --> 00:31:03,840
Għalkemm dan huwa daqsxejn qarrieqa
peress I biss recreated dak fajl?

677
00:31:03,840 --> 00:31:05,880
a.out.

678
00:31:05,880 --> 00:31:07,930
>> So let me Rewind għal ftit mument.

679
00:31:07,930 --> 00:31:10,900
Il-programm aħna biss kkompilata
għandu tliet linji ta 'kodiċi.

680
00:31:10,900 --> 00:31:14,710
Meta I dam bonjour dinja, bonjour mument
ilu, I ma tara tiddikjara l-isem tiegħek.

681
00:31:14,710 --> 00:31:17,080
U dan għaliex I dam l-
verżjoni l-qadima tal-programm.

682
00:31:17,080 --> 00:31:22,700
Imma jekk jien tassew run a.out dot mmejla
Daħħal, jiddikjaraw l-isem tiegħek, Rob, hello,

683
00:31:22,700 --> 00:31:23,370
dinja.

684
00:31:23,370 --> 00:31:23,870
Hm.

685
00:31:23,870 --> 00:31:26,110
C'est tip ta 'bug.

686
00:31:26,110 --> 00:31:28,560
Probabbilment maħsuba biex ngħid Rob, id-dritt?

687
00:31:28,560 --> 00:31:30,997
Allura x'inhu l-jiffissaw hawn fil-kodiċi.

688
00:31:30,997 --> 00:31:31,872
STUDENT: [inaudible].

689
00:31:31,872 --> 00:31:38,415

690
00:31:38,415 --> 00:31:39,290
DAVID Malan: Eżattament.

691
00:31:39,290 --> 00:31:43,160
So I biss ħtieġa li jagħmlu dak tweak finali
hekk li jien tgħaddi fil placeholder,

692
00:31:43,160 --> 00:31:45,690
bħal imla l-vojt,
bħal għamilna mument ilu.

693
00:31:45,690 --> 00:31:47,870
Imma fil-mija s issa huwa
li timla l-vojt.

694
00:31:47,870 --> 00:31:52,100
Mela fl-aħħar ejja jiżvelaw wieħed aħħar
dettall sabiex ma jkun hemm l-ebda magic.

695
00:31:52,100 --> 00:31:54,090
Jien ser jimxi 'l quddiem
u jeħles hellow.

696
00:31:54,090 --> 00:31:56,070
Jien ser jimxi 'l quddiem
u jeħles a.out.

697
00:31:56,070 --> 00:31:58,410
Allura issa I jkollhom ebda programmi,
biss kodiċi sors tiegħi.

698
00:31:58,410 --> 00:32:01,100
U jien ser tmexxi
kmand kemmxejn itwal, clang

699
00:32:01,100 --> 00:32:05,650
sing o bonjour LCS50 sing hello.c.

700
00:32:05,650 --> 00:32:08,700
>> Issa dan qed jibda tip ta 'jmorru
fil-widna waħda u l-oħra forsi.

701
00:32:08,700 --> 00:32:10,366
Iżda biss tease apparti dak li dan qed tagħmel.

702
00:32:10,366 --> 00:32:14,910
Clang huwa l-kumpilatur, LCS50 sing
deliberatament fl-aħħar nett

703
00:32:14,910 --> 00:32:18,330
ma dak fil-sentenza?

704
00:32:18,330 --> 00:32:19,607
Links għal-librerija CS50.

705
00:32:19,607 --> 00:32:21,440
Grabs l-żerijiet u
dawk li l-persunal magħmula

706
00:32:21,440 --> 00:32:23,310
u crams minnhom fil-programm tiegħi stess.

707
00:32:23,310 --> 00:32:27,040
Allura l-aħħar mistoqsija fil-idejn huwa,
dak li huwa sing o bonjour probabbilment

708
00:32:27,040 --> 00:32:30,530
tagħmel, anki jekk inti stajt qatt
rajt dan sintassi qabel?

709
00:32:30,530 --> 00:32:34,920
>> Outputting programm li l-
mhux imsemmi l-a.out default.

710
00:32:34,920 --> 00:32:37,330
Pjuttost huwa jismu bonjour.

711
00:32:37,330 --> 00:32:39,460
Allura issa m'hemm l-ebda a.out.

712
00:32:39,460 --> 00:32:42,660
Nru tali file jew direttorju,
minħabba I qal espliċitament

713
00:32:42,660 --> 00:32:46,720
sejħa dan il-programm hello, b'tali mod li
I issa tista tip fl-isem bħal dik

714
00:32:46,720 --> 00:32:47,790
u li hija jaġixxu.

715
00:32:47,790 --> 00:32:50,180
>> Issa franchement, boy huwa li
uninteresting li jkollhom

716
00:32:50,180 --> 00:32:52,170
li tiftakar kollha ta 'dak
ftit dettall, id-dritt?

717
00:32:52,170 --> 00:32:54,180
Mela ejja imorru quddiem u
jeħles bonjour darb'oħra.

718
00:32:54,180 --> 00:32:57,880
U ejja issa jirritorna għal dinja fl
li huwa biżżejjed li jingħad jagħmlu bonjour.

719
00:32:57,880 --> 00:33:00,410
Imma dak l-magic li
jagħmlu qed tagħmel għalik,

720
00:33:00,410 --> 00:33:02,320
dak l-tedium li
huwa qed jagħmel għalik.

721
00:33:02,320 --> 00:33:04,630
U kif il-programmi tagħna u
problemi nikseb aktar kumplessi,

722
00:33:04,630 --> 00:33:06,142
jagħmlu se verament tkun ħabib tiegħek.

723
00:33:06,142 --> 00:33:07,850
Minħabba li mhux twil wisq
minn issa aħna qed tmur

724
00:33:07,850 --> 00:33:11,150
li għandhom programmi li huma miktuba
mhux ma wieħed fajl, iżda diversi fajls,

725
00:33:11,150 --> 00:33:16,310
u jagħmlu se awtomatizzat il-proċess ta '
kompilazzjoni kollha ta 'dik għalina flimkien.

726
00:33:16,310 --> 00:33:20,620
>> Allura issa print.

727
00:33:20,620 --> 00:33:24,960
printf huwa ġewwa ta 'dan il-fajl, standard
I / O dot h, li aħna stajt tidher qabel,

728
00:33:24,960 --> 00:33:26,980
imma hemm aktar printf minn dak.

729
00:33:26,980 --> 00:33:30,482
Hemm n backslash, imma hemm ukoll
mazz ta 'sekwenzi ħarba oħra.

730
00:33:30,482 --> 00:33:32,940
U s-sekwenza ta 'ħruġ huwiex biss
mod fancy ta 'tgħid xi ħaġa

731
00:33:32,940 --> 00:33:35,990
li jibda bil backslash,
mhux slash quddiem, backslash,

732
00:33:35,990 --> 00:33:37,920
u ma xi ħaġa speċjali.

733
00:33:37,920 --> 00:33:43,770
U aħna mhux se nitkellem fuq aktar ta 'dawn,
iżda għaliex hemm backslash quote doppja,

734
00:33:43,770 --> 00:33:44,830
do you think?

735
00:33:44,830 --> 00:33:48,010
Għaliex hemm din is-sekwenza stramb ta
karattri, kwotazzjoni doppja backslash,

736
00:33:48,010 --> 00:33:50,505
għaliex jista 'jkun li utli?

737
00:33:50,505 --> 00:33:51,380
STUDENT: [inaudible].

738
00:33:51,380 --> 00:33:56,594

739
00:33:56,594 --> 00:33:57,760
DAVID Malan: Eżattament, id-dritt?

740
00:33:57,760 --> 00:34:01,830
Think lura għall-programm tagħna dinja bonjour
li aħna stajt tidher pjuttost ftit drabi issa,

741
00:34:01,830 --> 00:34:05,880
kull darba li aħna stajt tidher f'dak dinja bonjour
programm aħna kellna kwotazzjonijiet doppja ġewwa

742
00:34:05,880 --> 00:34:08,210
tagħhom huwa bonjour virgola
dinja backslash n.

743
00:34:08,210 --> 00:34:10,070
Imma taħseb li inti stess,
dak li jekk inti fil-fatt

744
00:34:10,070 --> 00:34:12,520
riedu jistampa mark kwotazzjoni?

745
00:34:12,520 --> 00:34:16,100
Ewwel istint tiegħek jista 'jkun, I ma
know għaliex I tista 'tixtieq li do-- hawn,

746
00:34:16,100 --> 00:34:18,780
nistgħu nkunu passiva ftit
aggressiva, bonjour ħabib.

747
00:34:18,780 --> 00:34:21,350
Aħna tista 'tixtieq li tagħmel xi ħaġa bħal dik.

748
00:34:21,350 --> 00:34:25,230
>> Iżda għaliex dan huwa issa problematika?

749
00:34:25,230 --> 00:34:28,730
Jinjora l-kwotazzjonijiet kaboċċi aside li
ewlieni għamel għalina awtomatikament.

750
00:34:28,730 --> 00:34:29,730
Għaliex hija din il-problematika?

751
00:34:29,730 --> 00:34:36,719

752
00:34:36,719 --> 00:34:37,270
>> Eżattament.

753
00:34:37,270 --> 00:34:39,022
Għaliex għandna like 4 virgoletti.

754
00:34:39,022 --> 00:34:41,230
Ukoll l-ewwel waħda probabbilment
tmur mat-tieni waħda,

755
00:34:41,230 --> 00:34:43,271
u forsi l-raba 'wieħed
tmur mat-tielet wieħed,

756
00:34:43,271 --> 00:34:46,170
jew, I tfisser M'inix ċert anke,
lanqas huwa l-kompjuter se tkun.

757
00:34:46,170 --> 00:34:48,352
Kompjuters għal darb'oħra, kompilaturi
darb'oħra, huma pjuttost dumb.

758
00:34:48,352 --> 00:34:50,060
Huma ser biss tagħmel dak
inti jgħidulhom li jagħmlu.

759
00:34:50,060 --> 00:34:54,270
U jekk int ma ambigwi huma
huma probabbilment se tarmi żball.

760
00:34:54,270 --> 00:34:57,700
>> Jekk int ma ambigwi dwar kif
tagħmel butir tal-karawett u sandwich jelly

761
00:34:57,700 --> 00:34:59,510
affarijiet strambi jista jaslu.

762
00:34:59,510 --> 00:35:00,580
Hu l-istess idea.

763
00:35:00,580 --> 00:35:03,100
Issa huwa biżżejjed li jingħad hemm
xi sekwenzi oħra tal-salvataġġ,

764
00:35:03,100 --> 00:35:04,820
imma aħna ser jaslu għal dawk qabel twil.

765
00:35:04,820 --> 00:35:07,410
Essenzjalment dawn ħarba
sekwenzi jirrappreżentaw xi ħaġa

766
00:35:07,410 --> 00:35:10,480
li inti tista 'ma tkun kapaċi
wisq faċilment fil-keyboard,

767
00:35:10,480 --> 00:35:12,010
mingħajr ma jikkonfondi l-kompjuter.

768
00:35:12,010 --> 00:35:15,733
>> Issa sadanittant għandna
placeholders fil printf.

769
00:35:15,733 --> 00:35:19,630
Perċentwali d, li jistgħu wkoll jiġu miktuba
kważi fil-każijiet kollha bħala mija i,

770
00:35:19,630 --> 00:35:21,610
huwa placeholder għal liema tip ta 'data?

771
00:35:21,610 --> 00:35:23,920
Liema tip ta 'valur?

772
00:35:23,920 --> 00:35:24,920
A numru deċimali.

773
00:35:24,920 --> 00:35:27,234
Allura fil-fatt aħna ser tibda
użu fil-mija i għaliex dan huwa

774
00:35:27,234 --> 00:35:28,650
ftit aktar sempliċi, bħal integer.

775
00:35:28,650 --> 00:35:29,550
I Perċentwali.

776
00:35:29,550 --> 00:35:31,320
Integer li jiġri li jkun deċimali.

777
00:35:31,320 --> 00:35:35,690
>> Perċentwali s aħna diġà qal ma kien
placeholder għal string.

778
00:35:35,690 --> 00:35:38,630
Liema hija biss kelma, frażi,
paragrafu, esej, ikun x'ikun.

779
00:35:38,630 --> 00:35:40,830
Huwa sekwenza ta '
karattri ta 'tul.

780
00:35:40,830 --> 00:35:42,820
U aħna ser tara qabel twil
xi wħud minn dawn ħaddieħor.

781
00:35:42,820 --> 00:35:45,950
Iżda fil-mija c hija għal karattru wieħed.

782
00:35:45,950 --> 00:35:48,500
Perċentwali f hija għal
punt numru galleġġjanti,

783
00:35:48,500 --> 00:35:50,860
bħal numru reali li għandha
punt deċimali fiha, li

784
00:35:50,860 --> 00:35:52,550
huwa ta 'kors mhux numru sħiħ.

785
00:35:52,550 --> 00:35:54,670
U hemm kollu
mazz ta 'oħrajn ukoll.

786
00:35:54,670 --> 00:35:56,990
>> Sadanittant fis-C, u
fil-lott ta 'lingwi,

787
00:35:56,990 --> 00:35:58,650
għandna tipi differenti ta 'dejta.

788
00:35:58,650 --> 00:36:00,650
Tipi differenti ta '
ħġieġ skutelli jekk inti se.

789
00:36:00,650 --> 00:36:03,830
Il-bowl I użat aħħar darba
kien għal blalen ping pong,

790
00:36:03,830 --> 00:36:06,990
iżda nistgħu wkoll jaħżnu differenti
Valuri bħal Chars u kordi

791
00:36:06,990 --> 00:36:10,820
u interi f'kontenitur,
bħal varjabbli, u C għandu dawn.

792
00:36:10,820 --> 00:36:14,020
Char huwa t-tip ta 'data,
it-tip ta 'varjabbli,

793
00:36:14,020 --> 00:36:15,700
fejn inti jista 'jaħżen karattru.

794
00:36:15,700 --> 00:36:19,560
Float huwa tip ta 'varjabbli fl
li inti jista 'jaħżen numru reali.

795
00:36:19,560 --> 00:36:21,220
>> Int huwa ta 'kors għal int.

796
00:36:21,220 --> 00:36:23,760
U pjuttost ridiculously
jismu twil twil

797
00:36:23,760 --> 00:36:26,830
huwa fejn inti jista 'jaħżen essenzjalment
numru verament twila, anke ma

798
00:36:26,830 --> 00:36:29,930
aktar ċifri imbagħad
Jista maħżen int tipiku.

799
00:36:29,930 --> 00:36:32,420
Iżda aħna ser terga 'lura għal li qabel twil.

800
00:36:32,420 --> 00:36:35,520
>> Fil CS50 dot h sadanittant
il-fajl header oħra

801
00:36:35,520 --> 00:36:37,630
li aħna stajt tidher koppja
darbiet użu, hemm

802
00:36:37,630 --> 00:36:41,350
żewġ tipi ta 'data oħra li
ma jeżistux fis-C tipikament.

803
00:36:41,350 --> 00:36:45,000
Wieħed huwa string, u aħna ser tara fil
ftit ġimgħat liema kordi verament

804
00:36:45,000 --> 00:36:46,610
huma taħt il-barnuża.

805
00:36:46,610 --> 00:36:47,950
U waħda hija bool.

806
00:36:47,950 --> 00:36:51,650
U bool hija varjabbli li
jista 'jieħu biss fuq ċerti valuri.

807
00:36:51,650 --> 00:36:54,370
U biss ibbażata fuq ġimgħa li għaddiet
spjegazzjoni ta 'Scratch,

808
00:36:54,370 --> 00:36:56,680
u aktar reċentement C,
dak li għandek raden

809
00:36:56,680 --> 00:37:01,770
huma ż-żewġ valuri possibbli għall
xi kontenitur li ma tkunx tat bool tip?

810
00:37:01,770 --> 00:37:02,860
>> Iva u le.

811
00:37:02,860 --> 00:37:03,870
Wieħed u żero.

812
00:37:03,870 --> 00:37:04,502
Veru jew falz.

813
00:37:04,502 --> 00:37:07,460
U fil-fatt huwa l-aħħar li għandha tendenza
li jkun konvenzjonali fil-programmazzjoni

814
00:37:07,460 --> 00:37:10,030
lingwa, tgħid xi ħaġa
bħall vera jew falza.

815
00:37:10,030 --> 00:37:13,160
>> Sadanittant il-librerija CS50 ġejja
bil-mazz ta 'funzjonalità

816
00:37:13,160 --> 00:37:16,640
li l-persunal kiteb għalik,
minbarra biss jkollna string.

817
00:37:16,640 --> 00:37:20,910
Aħna kiteb fil-funzjonijiet bil-quddiem li
jistgħu jiksbu integer mill-utent,

818
00:37:20,910 --> 00:37:22,990
tikseb karattru wieħed,
jiksbu float, li

819
00:37:22,990 --> 00:37:25,160
huwa biss numru mal-punt deċimali.

820
00:37:25,160 --> 00:37:28,290
Get a twil twil, verament
valur big mill-utent.

821
00:37:28,290 --> 00:37:30,930
Allura aħna ve biss dehru dan fil
azzjoni fil-forma ta 'GetString.

822
00:37:30,930 --> 00:37:33,230
Iżda permezz ta 'dawn il-funzjonijiet
dalwaqt se tkun tista 'tikteb

823
00:37:33,230 --> 00:37:36,070
programmi li tikseb input mill-utent.

824
00:37:36,070 --> 00:37:39,230
>> Sadanittant jikkunsidraw dan
programm, u jikkunsidraw

825
00:37:39,230 --> 00:37:42,600
kif aħna issa tista 'tibda biex iżżid
lilha bl constructs ġodda.

826
00:37:42,600 --> 00:37:44,530
A tour whirlwind quick
u allura aħna ser tħares

827
00:37:44,530 --> 00:37:47,340
f'xi kitba f'xi
programmi manwalment nfusna.

828
00:37:47,340 --> 00:37:49,700
Minn issa jekk irridu li
timplimenta kundizzjoni,

829
00:37:49,700 --> 00:37:52,790
mhuwiex ser look like a
sbieħ ftit biċċa puzzle pretty.

830
00:37:52,790 --> 00:37:54,460
Huwa ser tħares ftit aktar arcane.

831
00:37:54,460 --> 00:37:57,620
Iżda dan huwa l-canonical
istruttura ta 'kondizzjoni fil C.

832
00:37:57,620 --> 00:38:00,380
>> Il-kelma jekk, tnejn
parentesi, ġewwa li minnhom

833
00:38:00,380 --> 00:38:02,590
se jkun hemm xi tip
ta 'espressjoni Boolean.

834
00:38:02,590 --> 00:38:04,999
Issa l-slash slash
fin-nofs, dan huwa

835
00:38:04,999 --> 00:38:07,290
fil-mument tip simili
kodiċi placeholder pseudocode.

836
00:38:07,290 --> 00:38:11,576
Iżda aktar kif suppost, kwalunkwe linja tal-kodiċi
fis-C li tibda bi slash slash

837
00:38:11,576 --> 00:38:12,850
huwa kumment.

838
00:38:12,850 --> 00:38:15,920
>> Huwa simili nota twaħħal li inti tista
jitqiegħdu fuq esej, stampata fuq karta.

839
00:38:15,920 --> 00:38:17,290
Huwa nota lill yourself.

840
00:38:17,290 --> 00:38:20,100
Hija għandha l-ebda funzjonali
impatt fuq il-programm.

841
00:38:20,100 --> 00:38:23,580
Huwa tip ta 'tfakkira, huwa tiegħek stess
dokumentazzjoni dwar x'inhu għaddej.

842
00:38:23,580 --> 00:38:25,720
Allura tagħmel dan fil-mument
huwa tip ta 'placeholder

843
00:38:25,720 --> 00:38:27,560
għal kwalunkwe huwa ġewwa
ta 'dawk ċingi kaboċċi

844
00:38:27,560 --> 00:38:29,810
eventwalment se jagħmlu xi ħaġa.

845
00:38:29,810 --> 00:38:35,160
>> Sadanittant għandek żewġ frieket fl-
triq, li jekk inkella jinbena bħal dan.

846
00:38:35,160 --> 00:38:37,024
Inti tista 'jekk, ElseIf, inkella.

847
00:38:37,024 --> 00:38:39,690
Issa huwa min jinnota, speċjalment
jekk inti kont qed Googling madwar

848
00:38:39,690 --> 00:38:42,480
online għar-riżorsi minn
kurżità, jew jekk inti pick up

849
00:38:42,480 --> 00:38:44,575
wieħed mill-l-kors
kotba rakkomandati fuq C,

850
00:38:44,575 --> 00:38:48,430
se tara li l-bnedmin jkollhom lottijiet
preferenzi ta differenti għall kif

851
00:38:48,430 --> 00:38:50,510
biex jesprimu ruħhom fil-kodiċi.

852
00:38:50,510 --> 00:38:53,800
Xi nies jixtiequ li jpoġġu l-
braces kaboċċi bħala I ghamilt hawn.

853
00:38:53,800 --> 00:38:57,760
Xi nies jixtiequ li jpoġġu l-kaboċċi
ċingi per eżempju up here.

854
00:38:57,760 --> 00:39:01,700
>> Xi nies jixtiequ li jpoġġu l-elses
up hawn u allura dan hawn fuq.

855
00:39:01,700 --> 00:39:05,120
Hemm xi numru ta 'modi biex
jikteb il-kodiċi, u ħadd minnhom

856
00:39:05,120 --> 00:39:06,566
huma dritt per se.

857
00:39:06,566 --> 00:39:08,440
Għalkemm hemm ftit
li huma pjuttost ħażin.

858
00:39:08,440 --> 00:39:11,315
Iżda hemm no-- jekk dan huwa
finalment dibattitu reliġjużi ħafna.

859
00:39:11,315 --> 00:39:13,940
Fil-fatt, wieħed mill-aktar annoying
affarijiet dwar ix-xjenza tal-kompjuter

860
00:39:13,940 --> 00:39:16,310
huwa kif opinionated
xjenzjati tal-kompjuter jista 'jkun.

861
00:39:16,310 --> 00:39:19,880
U inti ser issib matul iż-żmien li
anke inti tiżviluppa l-preferenzi personali

862
00:39:19,880 --> 00:39:22,130
kif kodiċi tiegħek għandha tfittex.

863
00:39:22,130 --> 00:39:27,162
>> Mhux biss iġibu ruħhom, mhux biss joħolqu l-output,
imma kif hu għandu jeżamina estetikament.

864
00:39:27,162 --> 00:39:30,120
Allura dak li aħna se nagħmlu huwa jiggwidaw inti tul
it-triq lejn, għal issa mill-inqas,

865
00:39:30,120 --> 00:39:34,825
stil CS50 standard li mill-inqas
żżomm affarijiet uniformi u faċli biex jinqara.

866
00:39:34,825 --> 00:39:37,330
Iżda aktar fuq dawk
distinzjonijiet qabel twil.

867
00:39:37,330 --> 00:39:41,830
>> A espressjoni Boolean fis-C, jekk inti
riedu jgħidu jekk din il-kundizzjoni hija vera

868
00:39:41,830 --> 00:39:44,650
u din il-kundizzjoni l-oħra hija
veru, inti ma jiktbu l-kelma

869
00:39:44,650 --> 00:39:46,610
u, kif inti fil-Ingliż.

870
00:39:46,610 --> 00:39:50,580
Inti minflok tuża ampersand ampersand,
għal raġunijiet aħna ser terga 'lura għal.

871
00:39:50,580 --> 00:39:54,520
Jekk inti tixtieq li tgħid jew tuża tnejn
bars vertikali, li fuq tastiera Istati Uniti

872
00:39:54,520 --> 00:39:57,650
hija ġeneralment ogħla mill-Ikteb
jmiss muftieħ għall-backslash.

873
00:39:57,650 --> 00:40:03,080
U dan ifisser biss jekk din il-kundizzjoni
jew din il-kundizzjoni l-oħra hija veru tagħmel dan.

874
00:40:03,080 --> 00:40:05,210
>> Sadanittant hemm dan
ħaġa crazy, li

875
00:40:05,210 --> 00:40:07,760
inti ser ikollok okkażjoni
li tuża darba awhile.

876
00:40:07,760 --> 00:40:10,390
Iżda huwa biss alternattiva
mod biex tesprimi ruħek.

877
00:40:10,390 --> 00:40:12,400
Dan, għal issa, ejja
jistipula, huwa biss

878
00:40:12,400 --> 00:40:16,880
mod ieħor funky li jesprimu
jekk, ElseIf, ElseIf, ElseIf, ElseIf.

879
00:40:16,880 --> 00:40:19,720
Huwa biss formattjati f'termini
ta 'każijiet, fejn inti litteralment

880
00:40:19,720 --> 00:40:23,420
tenumera l-valuri li
inti tista 'tixtieq li jiċċekkjaw għall.

881
00:40:23,420 --> 00:40:24,410
>> Sadanittant loops.

882
00:40:24,410 --> 00:40:26,842
Rajna paragun ta '
Scratch ma 'loop.

883
00:40:26,842 --> 00:40:29,550
U jien ser mewġa naħa tiegħi fil
liema kull waħda minn dawn l-affarijiet jfisser.

884
00:40:29,550 --> 00:40:33,520
Iżda tinnota li loop se ħafna
spiss tibda bil-keyword għall.

885
00:40:33,520 --> 00:40:36,350
Jew se tibda bil-keyword waqt.

886
00:40:36,350 --> 00:40:41,360
Jew se tibda bil-keyword
do, u jintemm bit-keyword waqt.

887
00:40:41,360 --> 00:40:43,920
>> Imma dak li aħna qed waslu biex tara
hija aktar affarijiet bħal dan.

888
00:40:43,920 --> 00:40:47,950
Hawnhekk huwa, b'mod ġenerali fis-C, kif inti tista '
tiddikjara varjabbli u tagħtiha valur.

889
00:40:47,950 --> 00:40:50,610
Fil C mhuwiex suffiċjenti,
bħal fil Scratch, inti biss

890
00:40:50,610 --> 00:40:52,810
jgħidu tagħti me a varjabbli msejħa xi ħaġa.

891
00:40:52,810 --> 00:40:55,960
Int għandek tgħid C, u għid
kompilatur tiegħek, b'mod aktar speċifiku,

892
00:40:55,960 --> 00:40:58,680
liema tip ta 'valur do inti
tixtieq li tqiegħed fl-iskutella tal-ħġieġ.

893
00:40:58,680 --> 00:40:59,610
>> Huwa integer?

894
00:40:59,610 --> 00:41:02,210
Jekk iva, inti għandek
litteralment jgħidu int u mbagħad

895
00:41:02,210 --> 00:41:04,220
l-isem tal-varjabbli,
imbagħad virgola.

896
00:41:04,220 --> 00:41:08,050
Jekk inti minflok riedu string u sejjaħ
hija s bħal I ma kodiċi tiegħi hawn illum,

897
00:41:08,050 --> 00:41:10,920
inti ngħid string s virgola.

898
00:41:10,920 --> 00:41:14,200
Ladarba inti tixtieq li tagħtiha valur
inti tista 'mbagħad jużaw is-sinjal ugwali,

899
00:41:14,200 --> 00:41:16,211
inkella magħruf bħala l-
operatur assenjazzjoni.

900
00:41:16,211 --> 00:41:17,960
U avviż kif kull
ta 'dawn il-linji ta' kodiċi

901
00:41:17,960 --> 00:41:20,650
għandha l-virgola fi tmiem ta 'dan.

902
00:41:20,650 --> 00:41:22,550
>> Iżda franchement dan biss
jistenna ftit ikrah.

903
00:41:22,550 --> 00:41:26,580
Għaliex ma nista 'ngħid għall-kompjuter, jagħtu
me varjabbli u initialize fuq żero.

904
00:41:26,580 --> 00:41:28,380
Jiġifieri, tagħti me skutella ħġieġ vojta.

905
00:41:28,380 --> 00:41:28,980
Filwaqt li inti tista '.

906
00:41:28,980 --> 00:41:32,250
U għalhekk wieħed tas-sentenza iċempillek taf
għandek tagħmel stylistically matul iż-żmien

907
00:41:32,250 --> 00:41:36,290
huwa, do tikteb kodiċi tiegħek bħal dan, jew
do you tip ta 'inaddfu up u tagħfas

908
00:41:36,290 --> 00:41:39,040
nies bil-kitba żewġ linji biss bħala wieħed.

909
00:41:39,040 --> 00:41:41,830
U dan jitqies
ġeneralment b'mod aktar eleganti

910
00:41:41,830 --> 00:41:43,870
tal-kitba kodiċi tiegħek stylistically.

911
00:41:43,870 --> 00:41:45,200
>> Funzjonijiet aħna qed ovvjament tidher.

912
00:41:45,200 --> 00:41:46,340
Huma qed tmur biex tieħu dan il-format.

913
00:41:46,340 --> 00:41:48,881
L-isem ta 'funzjoni, xi
parentesi, u mbagħad forsi xi

914
00:41:48,881 --> 00:41:49,910
Jittieħed ġewwa.

915
00:41:49,910 --> 00:41:52,540
Jew inti tista 'tara l-użi ta'
funzjonijiet multipli ġenb

916
00:41:52,540 --> 00:41:55,980
ġenb, bħal xi ħaġa bħal din.

917
00:41:55,980 --> 00:41:59,390
Issa bħala tanġent, ma
dan Joke issa jagħmel sens?

918
00:41:59,390 --> 00:42:03,566

919
00:42:03,566 --> 00:42:04,960
>> [Rires]

920
00:42:04,960 --> 00:42:09,360
Dan ma jfissirx huwa umoristiċi, iżda
ma forsi jagħmlu ftit aktar sens.

921
00:42:09,360 --> 00:42:12,140
Allura issa ejja jmorru fil-
Appliance CS50 għal mument.

922
00:42:12,140 --> 00:42:14,640
U let me jiftħu teaser wieħed hawn.

923
00:42:14,640 --> 00:42:17,470
>> U fil-fatt waħda mir-raġunijiet
għall-introduzzjoni katalogu IKEA

924
00:42:17,470 --> 00:42:20,080
u teptip l-istampa
tal-iPhone daqsxejn ilu

925
00:42:20,080 --> 00:42:24,700
kien li attwalment jorbtu flimkien l-
fatt li biss ftit snin ilu, fl-2007,

926
00:42:24,700 --> 00:42:26,540
din il-biċċa tal-kodiċi kien
rilaxxati, li kienet

927
00:42:26,540 --> 00:42:29,820
wieħed mill-ewwel implimentazzjoni
ta 'biċċa ta' softwer

928
00:42:29,820 --> 00:42:31,494
li ma dak li sejjaħ jailbreaking.

929
00:42:31,494 --> 00:42:34,410
Għal dawk familjari, jailbreaking
xi ħaġa bħal telefon jew iPhone

930
00:42:34,410 --> 00:42:37,680
ifisser essenzjalment jidhru
kif jagħmlu l-affarijiet

931
00:42:37,680 --> 00:42:39,864
magħha li l-kumpanija
li għamilha ma riditx.

932
00:42:39,864 --> 00:42:42,780
Bħal inti tixtieq li tinstalla ċerti
software li mhux fil-maħżen app,

933
00:42:42,780 --> 00:42:45,405
jailbreaking phone tiegħek li
inti tagħmel affarijiet bħal dik u aktar.

934
00:42:45,405 --> 00:42:47,447
Imma dak li kien gost fil
2007-- u hemm kien

935
00:42:47,447 --> 00:42:49,780
għexieren ta 'verżjonijiet differenti
ta 'dawn l-affarijiet minn dakinhar,

936
00:42:49,780 --> 00:42:53,540
kull xorta ta 'languages-- hija li
dan il-programm hawn, imsejħa iUnlock,

937
00:42:53,540 --> 00:42:57,036
kienet attwalment miktuba C. U hekk I
jinġibed up-source code għal dan,

938
00:42:57,036 --> 00:42:59,910
biss biex tip ta 'turi li inti xi wħud
l-similaritajiet mal-constructs

939
00:42:59,910 --> 00:43:01,450
konna qed tiddiskuti s'issa.

940
00:43:01,450 --> 00:43:05,150
Issa hemm mod aktar kumplessità hawn
milli Rajna diġà fil-klassi.

941
00:43:05,150 --> 00:43:07,160
Let me iscroll up biss ftit hawn.

942
00:43:07,160 --> 00:43:11,520
>> Iżda avviż these-- ukoll aħna Avviż xi ftit
things-- iżda tinnota dawn il-linji hawnhekk,

943
00:43:11,520 --> 00:43:14,090
inklużi standard I / O dot h.

944
00:43:14,090 --> 00:43:17,660
U all-- linja 24, please--
Avviż I standard / O

945
00:43:17,660 --> 00:43:21,380
dot h u mazz sħiħ ta 'l-oħra
fajls li nies apparentement oħra

946
00:43:21,380 --> 00:43:22,160
kitbu.

947
00:43:22,160 --> 00:43:24,850
U jekk aħna iscroll permezz
dan, ftit arbitrarju,

948
00:43:24,850 --> 00:43:27,910
Avviż I do not know kif jiktbu
kollha ta 'dan myself neċessarjament għadhom,

949
00:43:27,910 --> 00:43:28,880
iżda hemm jekk.

950
00:43:28,880 --> 00:43:30,400
Allura apparentement dan jkollha fergħa.

951
00:43:30,400 --> 00:43:33,210
>> U jekk I iscroll ftit
ulterjuri hemm ieħor jekk.

952
00:43:33,210 --> 00:43:38,210
Jekk I iscroll up, I think
madwar linja 100 I raw għal.

953
00:43:38,210 --> 00:43:40,020
So jien ma pjuttost ċert
kif taħdem din għadha,

954
00:43:40,020 --> 00:43:43,180
iżda dan huwa għal loop li għaddej biex
let me jtenni xi numru ta 'drabi.

955
00:43:43,180 --> 00:43:45,230
U jekk I iscroll kollha
il-mod lejn il-qiegħ

956
00:43:45,230 --> 00:43:51,020
Nara li hemm
jiffunzjonaw stabbiliti hawn jissejjaħ

957
00:43:51,020 --> 00:43:54,570
prinċipali, u xi krediti addizzjonali
għall-pjaċir qari tiegħek.

958
00:43:54,570 --> 00:43:57,830
>> Allura dan huwa biss biex say-- u aħna ser jitqiegħdu
dan online fost sors fil-kors tal-

959
00:43:57,830 --> 00:44:01,480
kodiċi today-- li anki xi wħud minn dawn
apparati li nieħdu għall mogħtija,

960
00:44:01,480 --> 00:44:05,130
fl-aħħar tal-ġurnata int xorta
jużaw dawn constructs bażiċi li konna

961
00:44:05,130 --> 00:44:07,430
kienu jintroduċu diġà s'issa.

962
00:44:07,430 --> 00:44:08,620
C'est biżżejjed ta 'li wieħed.

963
00:44:08,620 --> 00:44:11,480
Kull dritt, hekk issa ejja
attwalment jibnu xi ħaġa.

964
00:44:11,480 --> 00:44:15,640
>> Ejja ħa mmorru lil hinn xi ħaġa simili
hello.c, u jiftħu dan,

965
00:44:15,640 --> 00:44:17,170
ejja tikteb dan il-programm hawn.

966
00:44:17,170 --> 00:44:19,850
Jien ser jimxi 'l quddiem u
jiktbu program imsejjaħ adder.c,

967
00:44:19,850 --> 00:44:23,310
iskop tagħhom fil-ħajja se tkun
bħall-ewwel calculator sempliċi super tiegħi

968
00:44:23,310 --> 00:44:24,840
li żżid biss ftit ta 'numri.

969
00:44:24,840 --> 00:44:27,050
Mhux għaliex thats iebsa
problema, iżda minħabba li

970
00:44:27,050 --> 00:44:29,390
tippermetti lili biex issa torbot
flimkien ftit affarijiet.

971
00:44:29,390 --> 00:44:33,100
So jien ser jimxi 'l quddiem u jinkludu
I standard / O dot h u CS50 dot h.

972
00:44:33,100 --> 00:44:34,670
Jien se ngħid null prinċipali int.

973
00:44:34,670 --> 00:44:36,545
U għal darb'oħra fil-futur
aħna ser terga 'lura għal

974
00:44:36,545 --> 00:44:38,560
fis f'dan il-kuntest u l-mezzi null.

975
00:44:38,560 --> 00:44:43,340
>> U issa jien se ngħid xi ħaġa
bħal printf, tagħti me integer.

976
00:44:43,340 --> 00:44:47,610
U issa fuq tieni linja tiegħi,
kif nista nesprimi ruħi bħal

977
00:44:47,610 --> 00:44:50,980
li nixtieq li tiddikjara varjabbli
li għaddej biex jaħżnu int?

978
00:44:50,980 --> 00:44:55,470
Litteralment liema do I tip jekk irrid li
joħolqu varjabbli li taħżen l-int

979
00:44:55,470 --> 00:44:58,270
would you say?

980
00:44:58,270 --> 00:44:59,650
int a ugwali getint.

981
00:44:59,650 --> 00:45:00,485
Sure, hekk li x-xogħlijiet.

982
00:45:00,485 --> 00:45:02,360
U biss għall-konsistenza
mal-kodiċi tkun taf

983
00:45:02,360 --> 00:45:04,485
tara online, let me bidla
dan x, biss minħabba x

984
00:45:04,485 --> 00:45:06,830
huwa isem varjabbli komuni
għall-użu, għall-inqas fl-alġebra.

985
00:45:06,830 --> 00:45:08,720
Issa let me imorru quddiem u ma printf darb'oħra.

986
00:45:08,720 --> 00:45:10,692
Agħti me numru sħiħ ieħor.

987
00:45:10,692 --> 00:45:12,900
U issa jien se tip
ta jitgħallmu minn dak il-mudell,

988
00:45:12,900 --> 00:45:14,490
Jien se ngħid y int gets GetInt.

989
00:45:14,490 --> 00:45:16,340
>> U aħna ħadthom ma jintużax
GetInt qabel, iżda biss

990
00:45:16,340 --> 00:45:19,860
bħall GetString tmur u gets string,
bħal Javier għamlet mill-udjenza,

991
00:45:19,860 --> 00:45:22,780
Bl-istess mod ma GetInt
tibda Teptip fil-pront.

992
00:45:22,780 --> 00:45:26,750
U effettivament stennija għall-utent
li tagħtiha integer, billi jittajpja fil

993
00:45:26,750 --> 00:45:27,900
u laqtu Ikteb.

994
00:45:27,900 --> 00:45:30,850
Issa fl-aħħar jien ser tagħmel
dan, printf-somma of--

995
00:45:30,850 --> 00:45:36,080
u let me nikseb now-- fancy
mija iu fil-mija i huwa preżenti

996
00:45:36,080 --> 00:45:39,270
i exclamation punt backslash n.

997
00:45:39,270 --> 00:45:42,750
U x'taħseb li jien ser
jitqiegħdu fil issa bħala l-inputs addizzjonali

998
00:45:42,750 --> 00:45:44,620
li printf?

999
00:45:44,620 --> 00:45:47,380
>> Ma rridx ngħid
litteralment nikkwota unquote x.

1000
00:45:47,380 --> 00:45:52,210
Irrid li klassi xu
imbagħad, u issa ejja nikseb fancy

1001
00:45:52,210 --> 00:45:54,420
u ejja biss wieħed jassumi
nistgħu nagħmlu dak li rridu.

1002
00:45:54,420 --> 00:45:56,330
Dak li inti trid tgħid li jmiss?

1003
00:45:56,330 --> 00:45:57,070
x plus y.

1004
00:45:57,070 --> 00:45:58,520
U fil-fatt li se jaħdmu.

1005
00:45:58,520 --> 00:46:01,760
Huwa minimament lingwi ta 'programmar
do jifhmu aritmetika bażiku,

1006
00:46:01,760 --> 00:46:03,500
u għalhekk dan għandu fil-fatt ix-xogħol.

1007
00:46:03,500 --> 00:46:06,730
>> So let me imorru quddiem u ma jagħmlu
Aġent li jżid fil-tieqa iswed u abjad tiegħi

1008
00:46:06,730 --> 00:46:08,090
stabbiliti hawn, Ikteb.

1009
00:46:08,090 --> 00:46:10,830
Linja cryptic iżda l-ebda żball
messaġġ, hekk li tajjeb.

1010
00:46:10,830 --> 00:46:14,410
Dot mmejla aġent li jżid, tagħti me integer, 1.

1011
00:46:14,410 --> 00:46:16,230
Agħti me numru sħiħ ieħor, 2.

1012
00:46:16,230 --> 00:46:18,770
Is-somma ta '1 u 2 hija 3.

1013
00:46:18,770 --> 00:46:21,730
>> Kull dritt, so a pretty trivjali
programm, imma x'hemm dan isir?

1014
00:46:21,730 --> 00:46:25,680
Huwa permess me biex jużaw funzjoni
sejħa hawn, sejħa funzjoni oħra hawn,

1015
00:46:25,680 --> 00:46:29,260
żewġ sejħiet għal GetInt, għal
sejħa terz sabiex printf,

1016
00:46:29,260 --> 00:46:30,720
u mbagħad jużaw dawn placeholders.

1017
00:46:30,720 --> 00:46:33,160
Allura huwa ftit aktar
sofistikata minn aħħar darba.

1018
00:46:33,160 --> 00:46:35,260
Imma x'jiġri jekk irrid
jiksbu ftit fancier?

1019
00:46:35,260 --> 00:46:38,900
>> Let me imorru quddiem u issa jagħmlu dan.

1020
00:46:38,900 --> 00:46:42,890
Let me imorru quddiem u joħolqu
fajl ġdid imsejjaħ kondizzjonijiet żero.

1021
00:46:42,890 --> 00:46:44,890
U jien ser tiffranka
xi żmien għall-klassijiet fini

1022
00:46:44,890 --> 00:46:48,260
u biss paste f'dik
kodiċi bħala punt tat-tluq.

1023
00:46:48,260 --> 00:46:51,510
U issa jien biss ser jitqiegħdu
xi ħaġa ġdida hawn fin-nofs.

1024
00:46:51,510 --> 00:46:55,889
So printf Nixtieq integer jekk jogħġbok.

1025
00:46:55,889 --> 00:46:58,180
U dan kollu kodiċi huwa disponibbli
fuq il-websajt tal-kors, il-

1026
00:46:58,180 --> 00:47:00,556
inti għandek bżonn ma tip dan kollu
fil-klassi jekk youd pjuttost ma.

1027
00:47:00,556 --> 00:47:02,638
int, u issa jien ser
użu, minflok ta 'X u Y,

1028
00:47:02,638 --> 00:47:05,270
Jien ser tuża n, li hija
probabbilment l-isem aktar komuni

1029
00:47:05,270 --> 00:47:09,220
għal integer fi programm tal-kompjuter.

1030
00:47:09,220 --> 00:47:12,060
U issa nixtieq li tagħmel
ftit sentenza hawn.

1031
00:47:12,060 --> 00:47:15,460
Jien ser tara jekk n
huwa akbar minn 0, allura

1032
00:47:15,460 --> 00:47:23,670
Jien se ngħid Whoops printf--,
printf-- inti qabad numru pożittiv,

1033
00:47:23,670 --> 00:47:25,370
exclamation punt backslash n.

1034
00:47:25,370 --> 00:47:26,460
Agħlaq dik.

1035
00:47:26,460 --> 00:47:33,150
Else Jien ser jistampa printf
inti qabad numru negattiv.

1036
00:47:33,150 --> 00:47:35,377
>> Issa qabel ma inti Yell fil lili,
ejja run dan il-programm.

1037
00:47:35,377 --> 00:47:36,210
Let me jinżlu hawn.

1038
00:47:36,210 --> 00:47:40,730
U kif nista jikkompilaw programm
kundizzjonijiet imsejħa sing 0?

1039
00:47:40,730 --> 00:47:42,300
Jagħmlu kundizzjonijiet sing 0.

1040
00:47:42,300 --> 00:47:45,560
Tip ta 'isem stupid, but-- dammit.

1041
00:47:45,560 --> 00:47:47,560
OK, mument tagħlim tajba.

1042
00:47:47,560 --> 00:47:48,410
Għaliex ma li jiksru?

1043
00:47:48,410 --> 00:47:51,360

1044
00:47:51,360 --> 00:47:54,710
>> What did I aċċidentalment call dan il-fajl?

1045
00:47:54,710 --> 00:47:56,876
Tista 'tip ta' jiddeduċi
mill-tab up here.

1046
00:47:56,876 --> 00:47:58,750
Allura huwa mhux ħażin li jien
ma dan, għaliex dan

1047
00:47:58,750 --> 00:48:00,208
se jiġri forsi biex xi wħud minnkom.

1048
00:48:00,208 --> 00:48:03,880
So I aċċidentalment jismu tiegħi
sors kundizzjoni kodiċi 0.

1049
00:48:03,880 --> 00:48:09,950
Iżda kodiċi sors tiegħi permezz tal-konvenzjoni għandhom
tkun fajl imsejjaħ kundizzjoni 0 sing c,

1050
00:48:09,950 --> 00:48:11,720
jew kwalunkwe dot c.

1051
00:48:11,720 --> 00:48:12,610
>> So let me jiffissaw dan.

1052
00:48:12,610 --> 00:48:16,880
Eżatt bħal Microsoft Word I tista 'tmur up
biex Save As u tagħmel kundizzjoni 0 dot c.

1053
00:48:16,880 --> 00:48:20,100
Issa biss sabiex ikunu imbarazz jien
se jmorru 'l quddiem u neħħi

1054
00:48:20,100 --> 00:48:23,020
kundizzjoni 0, li kien verżjoni l-qadima tiegħi.

1055
00:48:23,020 --> 00:48:26,550
U issa ejja do jagħmlu
kundizzjoni 0, Ikteb.

1056
00:48:26,550 --> 00:48:27,870
OK, jidher tajjeb.

1057
00:48:27,870 --> 00:48:29,510
>> Kundizzjoni 0, Ikteb.

1058
00:48:29,510 --> 00:48:33,530
Nixtieq integer jogħġbok, 50,
inti qabad numru pożittiv.

1059
00:48:33,530 --> 00:48:35,390
Issa kif madwar negattiva 50?

1060
00:48:35,390 --> 00:48:37,660
Inti qabad numru negattiv.

1061
00:48:37,660 --> 00:48:39,605
Kif dwar issa, 0.

1062
00:48:39,605 --> 00:48:42,250

1063
00:48:42,250 --> 00:48:45,350
Pretty żgur 0 mhuwiex negattiv.

1064
00:48:45,350 --> 00:48:47,780
>> Allura dan huwa tip ta 'bug loġiku.

1065
00:48:47,780 --> 00:48:50,680
Kif nista jiffissaw dan?

1066
00:48:50,680 --> 00:48:57,260
Else jekk n hija inqas minn 0, jagħmlu dan, inkella
jista 'jkollna tliet mod fergħa hawn,

1067
00:48:57,260 --> 00:49:01,740
printf inti qabad 0.

1068
00:49:01,740 --> 00:49:06,150
Allura issa jekk I terġa 'ssir din
programm, wara jikkompilawh

1069
00:49:06,150 --> 00:49:10,790
mill-ġdid ma tagħmel, u issa terġa 'ssir
kundizzjoni 0, dak I ser tara hawn

1070
00:49:10,790 --> 00:49:14,570
hija ta '0 tagħti me dak output.

1071
00:49:14,570 --> 00:49:16,280
Għalhekk, fejn huma aħna jmorru ma 'dan?

1072
00:49:16,280 --> 00:49:18,930
>> Ukoll huwa faċli ħafna li jitilfu vista
tal-foresti, għas-siġar.

1073
00:49:18,930 --> 00:49:23,590
U hekk inessu li jikkonkludu
ma dan il-video 2 u 1/2 minuta

1074
00:49:23,590 --> 00:49:25,710
li finalment huwa daqsxejn
ta 'ad mill-Google,

1075
00:49:25,710 --> 00:49:28,850
imma li verament huwa xhieda li
liema anke jużaw dawn bini bażika

1076
00:49:28,850 --> 00:49:33,020
blokki aħna finalment tista 'tagħmel darba
għandna daqsxejn ta 'programmar

1077
00:49:33,020 --> 00:49:34,463
sofistikati taħt ċinturini tagħna.

1078
00:49:34,463 --> 00:49:35,150
>> [Daqq ta mużika]

1079
00:49:35,150 --> 00:49:38,370

1080
00:49:38,370 --> 00:49:40,540
>> SAROO BRIERLEY (voiceover):
Kien 26 sena ilu,

1081
00:49:40,540 --> 00:49:42,470
u I kien biss dwar li jduru 5.

1082
00:49:42,470 --> 00:49:45,465
Aħna qbilna li l-istazzjon tal-ferrovija u
aħna mbarkat ferrovija tagħna flimkien.

1083
00:49:45,465 --> 00:49:48,010
My brother biss qal I ser
jibqgħu hawn, u jien ser jiġu lura.

1084
00:49:48,010 --> 00:49:51,140
And I maħsub biss, ukoll taf,
I tista 'ukoll biss tmur torqod

1085
00:49:51,140 --> 00:49:52,690
u hu ser biss jinxtegħel me up.

1086
00:49:52,690 --> 00:49:55,145
U meta I woke up li jmiss
jum, il-ġarr kollu

1087
00:49:55,145 --> 00:49:59,125
kien vojt fuq ferrovija runaway, a ghost
ferrovija tieħu me I do not know fejn.

1088
00:49:59,125 --> 00:50:01,980

1089
00:50:01,980 --> 00:50:06,280
>> I kien adottat out lejn l-Awstralja,
għal familja Awstraljana.

1090
00:50:06,280 --> 00:50:09,710
U mom kien imżejjen my
kamra mal-mappa ta 'l-Indja,

1091
00:50:09,710 --> 00:50:11,950
li hija tpoġġi jmiss għall komodina tiegħi.

1092
00:50:11,950 --> 00:50:15,830
I woke up kull filgħodu
jaraw li mappa, u għalhekk

1093
00:50:15,830 --> 00:50:18,530
huwa tip ta tinżamm l-memorji ħajjin.

1094
00:50:18,530 --> 00:50:20,530
Nies ngħid, int
jippruvaw isibu labra

1095
00:50:20,530 --> 00:50:23,560
fil haystack, Saroo
int qatt ser issib lilha.

1096
00:50:23,560 --> 00:50:28,540
>> I d jkunu flashed tal-postijiet li I
użati biex tmur, il-fwawar tal-familja tiegħi

1097
00:50:28,540 --> 00:50:29,890
tiffaċċja.

1098
00:50:29,890 --> 00:50:34,060
Ma kien hemm l-immaġni ta 'ommi,
bilqiegħda mal tagħha saqajn qasmu,

1099
00:50:34,060 --> 00:50:35,740
biss jaraw cry tagħha.

1100
00:50:35,740 --> 00:50:38,160
Life huwa biss tant diffiċli.

1101
00:50:38,160 --> 00:50:41,237
Dan kien teżor tiegħi.

1102
00:50:41,237 --> 00:50:44,320
And I kienet tħares lejn Google Map u
realizzati hemm Google Earth ukoll.

1103
00:50:44,320 --> 00:50:48,140
F'dinja fejn inti tista zoom fi,
I beda jkollhom kollha ta 'dawn il-ħsibijiet

1104
00:50:48,140 --> 00:50:51,500
u liema possibbiltajiet
li dan jista 'jagħmel għalija.

1105
00:50:51,500 --> 00:50:54,890
I qal li myself, inti taf, inti stajt
ltqajna dawk memorji fotografiċi kollha

1106
00:50:54,890 --> 00:50:58,590
u postijiet familjari fejn int minn, u
inti taf x'inhuma l-belt Dehra.

1107
00:50:58,590 --> 00:51:03,060
Dan jista 'jkun applikazzjoni li
inti tista 'tuża biex issib triqtek lura.

1108
00:51:03,060 --> 00:51:06,720
>> Ħsibt, ukoll I ser tpoġġi
dot fuq l-istazzjon tal-ferrovija Calcutta,

1109
00:51:06,720 --> 00:51:10,890
u linja raġġ, inti taf, li inti
għandhom jiġu tiftix madwar dan il-qasam.

1110
00:51:10,890 --> 00:51:13,750
I sort tal sab
dawn il-binarji tal-ferrovija.

1111
00:51:13,750 --> 00:51:18,160
U bdejt wara dan, u
Wasalt għall stazzjon tal-ferrovija li

1112
00:51:18,160 --> 00:51:22,228
rifless l-istess immaġini
li kien fil-memorji tiegħi.

1113
00:51:22,228 --> 00:51:23,707
Kollox mqabbla.

1114
00:51:23,707 --> 00:51:27,950
I maħsub biss Yep, I
taf fejn jien ser.

1115
00:51:27,950 --> 00:51:30,116
Jien biss ser let l-
Mappa li għandi in my head

1116
00:51:30,116 --> 00:51:33,080
ċomb me u jieħdu me lura għal Hometown tiegħi.

1117
00:51:33,080 --> 00:51:36,420
>> Wasalt għall-bieb ta '
l-dar li I twieled.

1118
00:51:36,420 --> 00:51:39,140
U mixi madwar madwar 15
metru madwar il-kantuniera,

1119
00:51:39,140 --> 00:51:42,980
kien hemm tliet onorevoli wieqfa
barra, ħdejn xulxin.

1120
00:51:42,980 --> 00:51:47,830
U l-wieħed nofs intensifikati l quddiem, u
I maħsub biss, dan huwa omm tiegħek.

1121
00:51:47,830 --> 00:51:53,450
Hi daħlet quddiem, hi hugged lili, u
konna hemm għal madwar ħames minuti.

1122
00:51:53,450 --> 00:51:56,530

1123
00:51:56,530 --> 00:51:59,000
>> Hija grabbed naħa tiegħi u
hi ħadet me lill-dar

1124
00:51:59,000 --> 00:52:02,450
u ltqajna fuq it-telefon, fejn hi
rang sister tiegħi u my brother

1125
00:52:02,450 --> 00:52:05,600
li jgħidu li, tafu,
brother tiegħek għandu biss

1126
00:52:05,600 --> 00:52:09,340
kollha f'daqqa deher bħal ghost.

1127
00:52:09,340 --> 00:52:12,440
U allura l-familja kienet tingħaqad mill-ġdid.

1128
00:52:12,440 --> 00:52:15,110
Kollox huwa kollha tajbin,
I għen ommi out,

1129
00:52:15,110 --> 00:52:17,110
hi ma jkollhom jiġu slaving bogħod.

1130
00:52:17,110 --> 00:52:19,555
Hija jistgħu jgħixu l-bqija
tal-ħajja tagħha fil-paċi.

1131
00:52:19,555 --> 00:52:23,460
>> Kien labra fil haystack,
iżda l-labra kien hemm.

1132
00:52:23,460 --> 00:52:24,400
Kollox hemm.

1133
00:52:24,400 --> 00:52:28,260
Kollox aħna għandna fid-dinja
hija fil-vit ta 'buttuna.

1134
00:52:28,260 --> 00:52:32,010
Imma inti ħadthom qbilna li jkollhom ir-rieda u
d-determinazzjoni li jixtiequ dan.

1135
00:52:32,010 --> 00:52:32,950
>> [Daqq ta mużika]

1136
00:52:32,950 --> 00:52:36,420

1137
00:52:36,420 --> 00:52:38,170
DAVID Malan: Wonderfully
testimonjali ħelu

1138
00:52:38,170 --> 00:52:40,540
biss dak li tista
issa do mat-teknoloġija.

1139
00:52:40,540 --> 00:52:43,390
Aħna se tara int ġimgħa d-dieħla.

1140
00:52:43,390 --> 00:52:44,374