1
00:00:00,000 --> 00:00:00,487

2
00:00:00,487 --> 00:00:11,210
>> [MIZIK jwe]

3
00:00:11,210 --> 00:00:12,100
>> ROB bodèn: Tout dwat.

4
00:00:12,100 --> 00:00:15,620
Se konsa,, premye bagay an premye, nan videyo
ki sòti nan yon figi yo konnen yo.

5
00:00:15,620 --> 00:00:22,080

6
00:00:22,080 --> 00:00:22,560
>> [VIDEO lèktur]

7
00:00:22,560 --> 00:00:23,370
>> -Tout dwa.

8
00:00:23,370 --> 00:00:27,150
Sa a se CS50, e sa se
kòmanse nan semèn twa.

9
00:00:27,150 --> 00:00:29,980
Mwen regrèt Mwen pa ta ka gen avèk ou
jodi a, men pèmèt mwen prezante

10
00:00:29,980 --> 00:00:32,880
CS50 nan pwòp Rob bodèn.

11
00:00:32,880 --> 00:00:33,872
>> [FEN VIDEO lèktur]

12
00:00:33,872 --> 00:00:39,340
>> [Aplodisman AK cheers]

13
00:00:39,340 --> 00:00:41,277
>> ROB bodèn: filmografi an nan
ki videyo ki kokenn.

14
00:00:41,277 --> 00:00:47,280

15
00:00:47,280 --> 00:00:47,770
Tout dwa.

16
00:00:47,770 --> 00:00:50,960
Se konsa, premye, gen nan yon lòt manje midi.

17
00:00:50,960 --> 00:00:52,330
Li nan demen nan 1:15.

18
00:00:52,330 --> 00:00:54,480
Gen nan pa gen manje midi Vandredi sa a.

19
00:00:54,480 --> 00:00:55,810
Li se ak Quora.

20
00:00:55,810 --> 00:01:00,190
Apre sa, Tommy a pa isit la ankò, men se yon sèl nan
moun yo gen ansyen CF tèt,

21
00:01:00,190 --> 00:01:01,530
Tommy McWilliam.

22
00:01:01,530 --> 00:01:02,730
Se konsa, li se yon nèg plezi.

23
00:01:02,730 --> 00:01:04,819
Ou ta dwe vini an.

24
00:01:04,819 --> 00:01:05,900
>> Tout dwa.

25
00:01:05,900 --> 00:01:11,360
Se konsa, semèn pase a, nou te kòmanse kraze apa
sou sa ki yon kòd vrèman se.

26
00:01:11,360 --> 00:01:14,830
Nou te li te ye depi nan konmansman an ki
li nan yon sekans nan karaktè.

27
00:01:14,830 --> 00:01:18,130
Men, semèn pase a, nou delved nan lefèt
ke sa se reyèlman yon sekans

28
00:01:18,130 --> 00:01:22,110
karaktè, byen, nou genyen kounye a
ranje nan karaktè.

29
00:01:22,110 --> 00:01:26,450
, Nou konn sa yon kòd, li nan yon etalaj
nan karaktè, nan fen anpil,

30
00:01:26,450 --> 00:01:30,920
nou gen sa a multiple nil espesyal, sa a
antislach 0, ki endike nan fen

31
00:01:30,920 --> 00:01:32,230
fisèl la.

32
00:01:32,230 --> 00:01:36,970
>> Se konsa, yon kòd se yon etalaj de
karaktè, men nou ka gen plis pase

33
00:01:36,970 --> 00:01:39,530
jis yon etalaj de karaktè yo,
nou kapab gen yon etalaj de nenpòt ki

34
00:01:39,530 --> 00:01:40,890
di ki kalite bagay nou vle.

35
00:01:40,890 --> 00:01:51,570
Se konsa, si ou sonje soti nan semèn pase a, a
Laj pwogram ki David prezante

36
00:01:51,570 --> 00:01:53,560
vrèman byen vit.

37
00:01:53,560 --> 00:01:57,010
Se konsa, premye bagay nou pral fè se
mande itilizatè a pou yon nonb antye ki pè, la

38
00:01:57,010 --> 00:01:58,800
kantite moun ki nan sal la.

39
00:01:58,800 --> 00:02:01,260
Yon fwa nou genyen ki nonb antye ki pè,
nou ap deklare yon etalaj.

40
00:02:01,260 --> 00:02:02,890
Avi sa a sentaks bracket.

41
00:02:02,890 --> 00:02:04,540
W ap ale nan jwenn itilize sa a.

42
00:02:04,540 --> 00:02:09,430
>> Se konsa, nou ap deklare yon etalaj de nonb antye relatif
rele laj, e gen n

43
00:02:09,430 --> 00:02:12,080
nonb antye relatif nan etalaj sa a.

44
00:02:12,080 --> 00:02:16,480
Se konsa, modèl sa a dwa isit la, sa a Int 4
mwen egal 0, mwen se mwens pase n, mwen plis

45
00:02:16,480 --> 00:02:20,580
plis, se sa ki tou pral gen yon modèl
ke ou jwenn anpil itilize yo.

46
00:02:20,580 --> 00:02:24,000
Paske sa a, se bèl anpil ki jan w ap
toujou ale nan repňte sou ranje.

47
00:02:24,000 --> 00:02:26,330
Se konsa, sonje ke n se la
longè nan etalaj nou an.

48
00:02:26,330 --> 00:02:32,120
Se konsa, isit la, nou ap repete mande
pou laj la nan moun mwen nan sal la.

49
00:02:32,120 --> 00:02:36,640
>> Apre sa a, nou desann, epi pou tou sa
rezon ki fè abitrè, nou Lè sa a,

50
00:02:36,640 --> 00:02:40,220
ekri ak lèt ​​detache konnen ki jan fin vye granmoun yo ap ale
yo dwe yon ane soti nan kounye a.

51
00:02:40,220 --> 00:02:49,980
Ak kouri pwogram sa a, se pou yo
fè laj, dot koupe laj.

52
00:02:49,980 --> 00:02:53,010
Se konsa, kantite moun ki nan chanm nan,
Se pou nou di gen twa.

53
00:02:53,010 --> 00:02:59,880
Epi n'ap di: premye moun ki se 13,
pwochen se 26, ak dènye a se 30.

54
00:02:59,880 --> 00:03:05,080
Se konsa, lè sa a li pral repňte sou sa yo twa
moun, enprime soti 14, 27, ak 31.

55
00:03:05,080 --> 00:03:16,060
>> Se konsa, sonje ke lè nou deklare yon
etalaj de gwosè n, endis yo nan ki

56
00:03:16,060 --> 00:03:19,950
etalaj, etalaj la gen valè ak
endis 0, 1, 2, tout wout la

57
00:03:19,950 --> 00:03:21,680
jiska n mwens 1.

58
00:03:21,680 --> 00:03:26,255
Se konsa, lè nou te di te gen twa moun ki
nan chanm nan, epi nou mete nan isit la

59
00:03:26,255 --> 00:03:29,850
iterasyon an premye nan sa a
bouk, mwen a pwal 0.

60
00:03:29,850 --> 00:03:31,650
Se konsa, nan endèks 0.

61
00:03:31,650 --> 00:03:34,540
Nou ap plase premye a
gen laj itilizatè a antre nan.

62
00:03:34,540 --> 00:03:38,870
Lè sa a, nan yon sèl kap vini an, nou ap antre nan la
dezyèm n itilizatè a antre nan, ak nan

63
00:03:38,870 --> 00:03:40,580
akote de, dènye n la.

64
00:03:40,580 --> 00:03:44,200
>> Se konsa, remake ke yon etalaj de gwosè
twa pa gen anyen

65
00:03:44,200 --> 00:03:46,040
nan endèks la twa.

66
00:03:46,040 --> 00:03:49,036
Sa a se pa ki valid.

67
00:03:49,036 --> 00:03:50,250
Tout dwa.

68
00:03:50,250 --> 00:03:55,136
Se konsa, pral tounen isit la.

69
00:03:55,136 --> 00:03:57,650

70
00:03:57,650 --> 00:04:01,590
Se konsa, kounye a ke nou te te fè fas ak ranje,
nou gen kèk abitye.

71
00:04:01,590 --> 00:04:03,780
Koulye a, nou ap ale pou avanse pou sou lòd
agiman liy, ki fè yo pral fè

72
00:04:03,780 --> 00:04:05,890
trè ki gen rapò ak pwoblèm sa a seri egzèsis la.

73
00:04:05,890 --> 00:04:09,670
>> Se konsa, moute jouk koulye a, chak fwa ou te
te deklare fonksyon prensipal ou an, nou te

74
00:04:09,670 --> 00:04:11,230
di Int anile prensipal la.

75
00:04:11,230 --> 00:04:14,070
Se konsa, anile jis vle di ke
nou pa pase nenpòt ki

76
00:04:14,070 --> 00:04:16,440
agiman nan fonksyon sa a.

77
00:04:16,440 --> 00:04:19,190
Koulye a, nou ap ale nan wè ke prensipal
ka pran kèk agiman.

78
00:04:19,190 --> 00:04:22,470
Isit la nou rele yo Int arg
ak tout kòd parantèz argv.

79
00:04:22,470 --> 00:04:26,930
Parantèz yo, yon lòt fwa ankò, ki endike
ke nou ap fè fas ak ranje.

80
00:04:26,930 --> 00:04:31,850
Se konsa, isit la, parantèz fisèl argv, nou
fè fas ak yon etalaj de strings.

81
00:04:31,850 --> 00:04:35,360
Se konsa, arg, ki k ap pase yo endike
konbyen agiman nou te

82
00:04:35,360 --> 00:04:37,580
pase nan pwogram sa a.

83
00:04:37,580 --> 00:04:46,050
Apre sa, yo wè sa ki sa vle di,
kite a fèmen sa a.

84
00:04:46,050 --> 00:04:46,490
>> OK.

85
00:04:46,490 --> 00:04:50,790
Se konsa, moute jouk koulye a, nou te kouri chak
pwogram tankou laj koupe dot.

86
00:04:50,790 --> 00:04:55,250
Nou kapab tou, nan liy lan lòd, sot pase yo
pase agiman, enben, tèm nan, lòd

87
00:04:55,250 --> 00:04:56,550
liy agiman.

88
00:04:56,550 --> 00:04:59,760
Se konsa, agiman an premye, bonjou nan lemonn.

89
00:04:59,760 --> 00:05:03,350
Se konsa, isit la, arg ta dwe twa.

90
00:05:03,350 --> 00:05:07,720
Li nan konte a nan agiman yo
nan liy lan lòd.

91
00:05:07,720 --> 00:05:12,840
Arg se toujou omwen 1, depi dot
koupe laj, li menm, konsidere kòm youn nan

92
00:05:12,840 --> 00:05:14,490
liy lòd agiman yo.

93
00:05:14,490 --> 00:05:17,010
>> Lè sa a, bonjou se premye a.

94
00:05:17,010 --> 00:05:20,460
Si laj koupe dot se zeroth a, Lè sa a,
alo se premye a, ak mond la se nan

95
00:05:20,460 --> 00:05:22,830
dezyèm lòd liy agiman.

96
00:05:22,830 --> 00:05:29,490
Se konsa, argv nan fisèl, nou ap ale nan wè la a,
gen strings, dot koupe nan

97
00:05:29,490 --> 00:05:33,830
laj, hello, ak nan lemonn.

98
00:05:33,830 --> 00:05:38,945
Epi, si ou mande sa David la, nou pral
yo jwe yon videyo entwodwi sa a.

99
00:05:38,945 --> 00:05:42,486

100
00:05:42,486 --> 00:05:43,890
>> [VIDEO lèktur]

101
00:05:43,890 --> 00:05:46,240
>> -Up jouk koulye a nan pwogram nou te
ekri, nou te deklare

102
00:05:46,240 --> 00:05:48,500
prensipal kòm Int anile prensipal la.

103
00:05:48,500 --> 00:05:51,170
Apre sa, tout tan sa a, ki anile gen
tou senpleman te espesifye ki la

104
00:05:51,170 --> 00:05:54,430
pwogram pa pran okenn
lòd liy agiman.

105
00:05:54,430 --> 00:05:57,750
Nan lòt mo, lè yon itilizatè kouri yon
pwogram nan, li oswa li te ka bay lòd

106
00:05:57,750 --> 00:06:01,710
agiman liy pa ekri plis
mo ak fraz apre pwogram lan

107
00:06:01,710 --> 00:06:03,000
non nan èd memwa a.

108
00:06:03,000 --> 00:06:06,550
>> Byen, si w ou vle pwogram ou a
pran lòd agiman liy, youn oswa

109
00:06:06,550 --> 00:06:10,540
plis mo sa yo, nou bezwen ranplase
anile ak yon koup la agiman.

110
00:06:10,540 --> 00:06:12,200
Se konsa, kite a fè sa.

111
00:06:12,200 --> 00:06:15,750
Mete CS50.h.

112
00:06:15,750 --> 00:06:19,360
Mete estanda io.h.

113
00:06:19,360 --> 00:06:20,760
Int prensipal la.

114
00:06:20,760 --> 00:06:26,330
Epi, koulye a, olye pou yo anile, mwen pral
presize yon Int rele arg, ak yon

115
00:06:26,330 --> 00:06:28,780
etalaj de strings rele argv.

116
00:06:28,780 --> 00:06:31,820
Koulye a, arg ak argv yo
tou senpleman konvansyon.

117
00:06:31,820 --> 00:06:34,000
>> Nou te kapab yo te rele agiman sa yo
anyen ki pi nou vle.

118
00:06:34,000 --> 00:06:37,630
Men, ki sa ki enpòtan se ke arg se
yon Int paske, pa definisyon, li se

119
00:06:37,630 --> 00:06:41,360
ale nan gen ladan konte nan agiman, nan
kantite mo nan manm ki la

120
00:06:41,360 --> 00:06:43,380
te itilizatè tape nan èd memwa li.

121
00:06:43,380 --> 00:06:47,910
argv, pandan se tan, agiman vektè, se
ale nan aktyèlman ap yon etalaj estoke

122
00:06:47,910 --> 00:06:52,020
tout nan mo sa yo ki itilizatè a gen
tape nan èd memwa li.

123
00:06:52,020 --> 00:06:54,500
>> Se pou yo kontinye nan fè yon bagay kounye a
ak youn oswa plis nan sa yo

124
00:06:54,500 --> 00:06:55,660
lòd liy agiman.

125
00:06:55,660 --> 00:07:00,070
An patikilye, se pou yo ale pi devan epi ekri ak lèt ​​detache
tou sa pawòl ki kalite itilizatè

126
00:07:00,070 --> 00:07:03,960
apre Non pwogram lan
nan èd memwa a.

127
00:07:03,960 --> 00:07:04,730
Louvri bracket.

128
00:07:04,730 --> 00:07:06,240
Fèmen bracket.

129
00:07:06,240 --> 00:07:10,510
S antislach printf pousan ak vigil.

130
00:07:10,510 --> 00:07:14,550
Koulye a, mwen bezwen di printf sa ki valè
ploge nan ki kontneur.

131
00:07:14,550 --> 00:07:18,600
Mwen vle pawòl Bondye a premye ki itilizatè a gen
tape apre Non pwogram lan,

132
00:07:18,600 --> 00:07:23,130
yo ak pou mwen pral presize
argv bracket 1, fèmen

133
00:07:23,130 --> 00:07:24,830
parantèz, pwenvigil.

134
00:07:24,830 --> 00:07:27,290
>> Koulye a, poukisa bracket 1 epi yo pa bracket 0?

135
00:07:27,290 --> 00:07:30,990
Oke, li vire soti, otomatikman ki estoke
nan argv 0 a pwal nan

136
00:07:30,990 --> 00:07:32,620
aktyèl Non pwogram lan.

137
00:07:32,620 --> 00:07:36,180
Se konsa, pawòl Bondye a premye ki kalite mouvman yo itilizatè
apre Non pwogram lan se, pa

138
00:07:36,180 --> 00:07:38,990
konvansyon, pral fè
ki estoke nan argv 1.

139
00:07:38,990 --> 00:07:42,380
Se pou nou kounye a konpile ak
kouri pwogram sa a.

140
00:07:42,380 --> 00:07:47,780
>> Fè argv 0, dot koupe argv 0.

141
00:07:47,780 --> 00:07:50,520
Epi, koulye a yon mo tankou hello.

142
00:07:50,520 --> 00:07:51,670
Antre.

143
00:07:51,670 --> 00:07:53,520
Apre sa, nou genyen li, hello.

144
00:07:53,520 --> 00:07:55,750
>> [FEN VIDEO lèktur]

145
00:07:55,750 --> 00:07:57,000
>> ROB bodèn: Tout dwat.

146
00:07:57,000 --> 00:07:59,380

147
00:07:59,380 --> 00:08:01,230
Fèmen sa a.

148
00:08:01,230 --> 00:08:16,730
Se konsa, pran yon gade nan ki pwogram ki
nou jis prezante yo nou, byen, jis

149
00:08:16,730 --> 00:08:24,710
yo montre, si nou ekri ak lèt ​​detache argv 0, fè, kounye a
ki sa ki li, argv 0, dot koupe argv 0.

150
00:08:24,710 --> 00:08:30,440
Se konsa, jan yo espere a, li te enprime soti nan
Non pwogram lan, depi argv 0 se

151
00:08:30,440 --> 00:08:32,970
toujou pral fè a
Non pwogram lan.

152
00:08:32,970 --> 00:08:35,640
Men, kite a fè yon bagay yon
ti jan pi plis enteresan.

153
00:08:35,640 --> 00:08:42,080
>> Se konsa, nan pwoblèm mete nan, ou pral
prezante yo fonksyon sa a, atwa.

154
00:08:42,080 --> 00:08:44,440
Se konsa, sa nou itilize atwa pou?

155
00:08:44,440 --> 00:08:48,550
Sa a ale nan konvèti yon
fisèl nan yon nonb antye ki pè.

156
00:08:48,550 --> 00:08:53,280
Se konsa, si, fòk mwen pase fisèl la, yon sèl de twa,
atwa, ki pral konvèti ki

157
00:08:53,280 --> 00:08:56,910
nonb antye ki pè a, yon sèl de twa.

158
00:08:56,910 --> 00:09:01,480
Se konsa, nou ap ale nan konvèti premye a
lòd liy agiman nan yon nonb antye ki pè,

159
00:09:01,480 --> 00:09:05,690
ak Lè sa a, jis ekri ak lèt ​​detache ki nonb antye ki pè.

160
00:09:05,690 --> 00:09:09,680
>> Se konsa, fondamantalman, nou kalite
reimplementing getint, jis nan

161
00:09:09,680 --> 00:09:12,350
nonb antye ki pè se te antre nan nan yo lòd, ki
liy olye pou yo nan pwogram nan

162
00:09:12,350 --> 00:09:14,560
epi youn.

163
00:09:14,560 --> 00:09:23,170
Se konsa, lè sa a, fè argv 0, se pou yo fè
li nan isit la, epi fèmen sa a.

164
00:09:23,170 --> 00:09:27,670
Se konsa, kouri argv 0, e kite yo antre nan la
nonb antye ki pè, yon sèl de twa kat youn de.

165
00:09:27,670 --> 00:09:30,840
Se konsa, li pral ekri ak lèt ​​detache nonb antye ki pè a, yon sèl
de twa kat youn de.

166
00:09:30,840 --> 00:09:35,500
Gen kèk sibtilite atwa ki
li pral sispann pran swen sou anyen

167
00:09:35,500 --> 00:09:39,040
ale pi lwen pase ki valid nimerik karaktè,
men sa pa gen pwoblèm.

168
00:09:39,040 --> 00:09:42,870
>> Se konsa, ki sa ou panse k ap pase
si mwen fè sa?

169
00:09:42,870 --> 00:09:45,520

170
00:09:45,520 --> 00:09:47,050
Segmentation fay.

171
00:09:47,050 --> 00:09:50,410
Se konsa, poukisa se sa?

172
00:09:50,410 --> 00:09:56,060
Si ou gade tounen nan pwogram nou an, nou
konvèti argv 1, agiman an premye

173
00:09:56,060 --> 00:09:59,610
apre Non pwogram lan, nan yon nonb antye ki pè.

174
00:09:59,610 --> 00:10:03,350
Men pa gen okenn agiman te pase
apre Non pwogram lan.

175
00:10:03,350 --> 00:10:08,060
Se konsa, isit la, nou wè ke sa a se yon buggy
pwogram, depi, si nou eseye kouri li

176
00:10:08,060 --> 00:10:10,530
san yo pa nenpòt agiman,
li pral jis aksidan.

177
00:10:10,530 --> 00:10:16,950
>> Se konsa, yon lòt modèl komen ou pral wè
se yon bagay tankou, si arg ki pi piti a

178
00:10:16,950 --> 00:10:21,100
pase de, ki endike ke pa t 'la
omwen non pwogram nan ak yon

179
00:10:21,100 --> 00:10:29,100
premye agiman, lè sa a nou pral fè yon bagay
tankou printf, pa ase

180
00:10:29,100 --> 00:10:31,190
lòd liy agiman.

181
00:10:31,190 --> 00:10:33,170
Sa a pwobableman pa yon bon ekri ak lèt ​​detache,
li la pwobableman yon bagay, tankou

182
00:10:33,170 --> 00:10:35,440
ou ta dwe antre nan yon nonb antye relatif
nan liy lan lòd.

183
00:10:35,440 --> 00:10:37,450
Mwen pral jis fini ak li a.

184
00:10:37,450 --> 00:10:39,600
Lè sa a, retounen 1.

185
00:10:39,600 --> 00:10:44,740
Se konsa, sonje ke nan fen nou an
pwogram, si nou tounen 0, ki sòt de

186
00:10:44,740 --> 00:10:47,060
endike siksè.

187
00:10:47,060 --> 00:10:50,940
Apre sa, prensipal tou otomatikman
retounen 0 si w pa fè sa.

188
00:10:50,940 --> 00:10:55,800
>> Se konsa, isit la, nou ap retuning 1 a endike
ki sa a pa siksè.

189
00:10:55,800 --> 00:11:01,000
Apre sa, ou ka retounen tou sa ou vle,
jis, 0 endike siksè, ak

190
00:11:01,000 --> 00:11:03,390
nenpòt lòt bagay endike echèk.

191
00:11:03,390 --> 00:11:04,855
Se konsa, kite a kouri vèsyon sa-a nan bagay sa yo.

192
00:11:04,855 --> 00:11:12,880

193
00:11:12,880 --> 00:11:16,600
Se konsa, koulye a, si nou pa antre nan yon liy lòd
agiman, li pral di kòrèkteman

194
00:11:16,600 --> 00:11:18,290
nou, pa ase liy lòd.

195
00:11:18,290 --> 00:11:20,610
Pa t 'fini fraz la.

196
00:11:20,610 --> 00:11:24,950
Lòt Bagay, si nou aktyèlman pase l yon sèl,
li ka konplete pwogram la.

197
00:11:24,950 --> 00:11:27,920
Se konsa, sa a se ki jan ou ta sèvi ak arg nan
lòd yo valide ki kantite

198
00:11:27,920 --> 00:11:30,630
liy lòd agiman ki
yo aktyèlman te pase.

199
00:11:30,630 --> 00:11:39,360
>> Se konsa, kite a fè pwogram sa a yon ti jan pi plis
konplike, epi gade nan dezyèm lan

200
00:11:39,360 --> 00:11:42,180
iterasyon de bagay sa yo.

201
00:11:42,180 --> 00:11:46,310
Se konsa, koulye a, nou ap pa sèlman enprime la
premye lòd liy agiman.

202
00:11:46,310 --> 00:11:51,210
Isit la, nou ap iteration soti nan Int egal mwen
0, mwen se mwens pase arg, mwen plis

203
00:11:51,210 --> 00:11:55,280
plis, ak argv enprime, endèks mwen.

204
00:11:55,280 --> 00:11:59,300
Se konsa, modèl sa a, ankò, sa a se menm bagay la tou
modèl tankou anvan, eksepte olye pou

205
00:11:59,300 --> 00:12:02,600
pou rezidan yo rele varyab la
n, nou ap lè l sèvi avèk arg.

206
00:12:02,600 --> 00:12:09,520
>> Se konsa, sa a se iteration sou chak endèks
nan etalaj la, ak enprime chak

207
00:12:09,520 --> 00:12:11,910
eleman nan ki etalaj.

208
00:12:11,910 --> 00:12:20,300
Se konsa, lè nou kouri pwogram sa a, byen,
Mwen pa t 'antre nan nenpòt liy lòd

209
00:12:20,300 --> 00:12:22,540
agiman, se konsa li jis simagri
Non pwogram lan.

210
00:12:22,540 --> 00:12:26,053
Si m 'antre nan yon pakèt moun sou bagay sa yo, li pral
ekri ak lèt ​​detache yon sèl, yo chak sou liy pwòp li yo.

211
00:12:26,053 --> 00:12:31,213

212
00:12:31,213 --> 00:12:32,210
>> OK.

213
00:12:32,210 --> 00:12:34,770
Se konsa, kite a pran yon sèl sa a etap pi lwen.

214
00:12:34,770 --> 00:12:38,890
Apre sa, olye pou yo enprime chak agiman
sou liy pwòp li yo, se pou yo ekri ak lèt ​​detache chak

215
00:12:38,890 --> 00:12:42,590
karaktè nan chak agiman
sou liy pwòp li yo.

216
00:12:42,590 --> 00:12:46,700
Se konsa, sonje ke argv se
yon etalaj de strings.

217
00:12:46,700 --> 00:12:50,960
Se konsa, sa se yon fil, men
yon etalaj de karaktè?

218
00:12:50,960 --> 00:12:57,140
Se konsa, ki vle di ke argv se reyèlman yon
etalaj de yon etalaj de karaktè.

219
00:12:57,140 --> 00:13:04,920
Se konsa, pran avantaj de sa a,
kite a inyore sa a pou kounye a.

220
00:13:04,920 --> 00:13:08,190
Se pou nou jis konsidere argv la fisèl 0.

221
00:13:08,190 --> 00:13:14,170
>> Se konsa, si nou vle pote chak karaktè nan
argv 0 sou liy pwòp li yo, Lè sa a, mwen vle

222
00:13:14,170 --> 00:13:19,500
fè modèl la n ap itilize yo, mwen se
mwens pase longè a nan etalaj la,

223
00:13:19,500 --> 00:13:23,990
ki isit la, se strlèn nan, ki nan
pa sa m 'vle fè a, fisèl

224
00:13:23,990 --> 00:13:26,450
s egal argv 0.

225
00:13:26,450 --> 00:13:30,390
Se konsa, mwen se mwens pase longè a nan nou an
etalaj, ki nan ka sa a se yon etalaj

226
00:13:30,390 --> 00:13:34,410
nan karaktè, mwen plis plis.

227
00:13:34,410 --> 00:13:41,040
Se konsa, kòm nou te wè semèn pase a, li la ideyal
si nou demenaje ki strlèn deyò

228
00:13:41,040 --> 00:13:45,210
nan kondisyon an, depi n ap ajoute
strlèn a nan s chak fwa nou ale

229
00:13:45,210 --> 00:13:47,720
nan bouk la, epi li
pa yo pral chanje.

230
00:13:47,720 --> 00:13:50,230
Se konsa, nou pral mete l 'egal a n sou isit la.

231
00:13:50,230 --> 00:13:54,260

232
00:13:54,260 --> 00:13:55,170
>> OK.

233
00:13:55,170 --> 00:14:01,320
Se konsa, koulye a, nou ap iteration sou
chak endèks nan etalaj la.

234
00:14:01,320 --> 00:14:05,630
Se konsa, si nou vle ekri ak lèt ​​detache chak
karaktè nan ki etalaj, pousan c se

235
00:14:05,630 --> 00:14:06,880
drapo a nou vle sèvi ak
pou karaktè.

236
00:14:06,880 --> 00:14:10,750

237
00:14:10,750 --> 00:14:19,770
Epi, koulye a yon mwen bracket a pwal nan
fisèl, pèsonaj endèks mwen, kidonk si la

238
00:14:19,770 --> 00:14:20,970
fisèl te hello.

239
00:14:20,970 --> 00:14:27,530
Lè sa a, s 0 a pwal h, s bracket
1 yo pral e, ak sou sa.

240
00:14:27,530 --> 00:14:30,800
>> Se konsa, koulye a nou vle konbine
de bagay sa yo.

241
00:14:30,800 --> 00:14:35,440
Nou vle ekri ak lèt ​​detache chak karaktè
nan chak agiman liy lòd.

242
00:14:35,440 --> 00:14:38,950
Se konsa, nou ap ale nan gen
yon nich pou bouk.

243
00:14:38,950 --> 00:14:47,480
Apre sa, konvansyonèl, premye kontwa an
Se mwen menm, pwochen an a pwal j, n

244
00:14:47,480 --> 00:14:54,450
yo pral strlèn a nan argv mwen, mwen
se mwens pase n, mwen plis plis.

245
00:14:54,450 --> 00:14:59,150

246
00:14:59,150 --> 00:15:06,870
Epi, koulye a olye pou yo enprime argv mwen, se konsa
argv bracket mwen se ale nan endèks -

247
00:15:06,870 --> 00:15:14,280
ki k ap pase yo dwe liy lan m-th lòd
agiman, argv mwen, j ki pral

248
00:15:14,280 --> 00:15:16,925
gen karaktè a jth nan
m-th agiman an.

249
00:15:16,925 --> 00:15:20,580

250
00:15:20,580 --> 00:15:24,810
Mwen pral debarase m de sa a moute isit la kounye a
depi nou mete l 'nan ke bouk.

251
00:15:24,810 --> 00:15:33,900
Se konsa, ki ekivalan a egal fisèl la
argv mwen, ak Lè sa a, yo bracket j.

252
00:15:33,900 --> 00:15:36,980
>> Oke, nou pa bezwen deklare
sa a s varyab.

253
00:15:36,980 --> 00:15:44,530
Olye de sa, nou pral jis konbine sa yo
de nan ki sa nou te genyen, argv mwen, j.

254
00:15:44,530 --> 00:15:45,780
>> Oratè 1: [fèbl].

255
00:15:45,780 --> 00:15:48,850

256
00:15:48,850 --> 00:15:49,680
>> ROB bodèn: Bon apèl.

257
00:15:49,680 --> 00:15:52,936
Se konsa, sa a se kase.

258
00:15:52,936 --> 00:15:55,510
Si m 'aktyèlman kouri l', nou ta
te reyalize sa a.

259
00:15:55,510 --> 00:16:01,210
Se konsa, kontwa an mwen pran swen sou
nan sa a an patikilye pou

260
00:16:01,210 --> 00:16:05,410
bouk se j, iterator la.

261
00:16:05,410 --> 00:16:08,560
Se konsa, ou ta gen kouri antre nan pwoblèm,
pwobableman yon bouk enfini, si nou

262
00:16:08,560 --> 00:16:09,540
pa t 'fiks sa.

263
00:16:09,540 --> 00:16:12,220
Se poutèt sa nou ap tou ap pale
sou debogaj jodi a.

264
00:16:12,220 --> 00:16:13,120
>> OK.

265
00:16:13,120 --> 00:16:15,240
Se konsa, kite a kouri pwogram sa a.

266
00:16:15,240 --> 00:16:21,200
Li kite yo aktyèlman ajoute yon printf separe
dwa isit la ki pral jis ekri ak lèt ​​detache

267
00:16:21,200 --> 00:16:27,480
yon lòt liy, depi sa sa vle di lè nou
kouri pwogram nan, gen pral yon vid

268
00:16:27,480 --> 00:16:31,830
liy nan ant chak karaktè nan
chak liy agiman lòd.

269
00:16:31,830 --> 00:16:33,448
Oke, nou pral wè kisa sa vle di.

270
00:16:33,448 --> 00:16:37,310

271
00:16:37,310 --> 00:16:37,790
Op.

272
00:16:37,790 --> 00:16:39,870
Gen kèk ensèk.

273
00:16:39,870 --> 00:16:42,860
Erè chal deklare
fonksyon bibliyotèk strlèn.

274
00:16:42,860 --> 00:16:51,630
>> Se konsa, pral tounen nan pwogram nou an, mwen
bliye Hash gen ladan string.h.

275
00:16:51,630 --> 00:16:54,240

276
00:16:54,240 --> 00:16:57,730
Se konsa, string.h a pwal nan
dosye header ki deklare

277
00:16:57,730 --> 00:16:58,980
fonksyon an strlèn.

278
00:16:58,980 --> 00:17:04,650

279
00:17:04,650 --> 00:17:06,060
OK, li compiles.

280
00:17:06,060 --> 00:17:09,109
Koulye a, se pou yo kouri li.

281
00:17:09,109 --> 00:17:10,930
Se konsa, sèlman sa.

282
00:17:10,930 --> 00:17:17,790
Li ale nan ekri ak lèt ​​detache soti nou an
Non pwogram nan, bonjou nan lemonn.

283
00:17:17,790 --> 00:17:23,510
Li ale nan ekri ak lèt ​​detache chak bagay, chak
karaktè, sou liy pwòp li yo.

284
00:17:23,510 --> 00:17:24,540
OK.

285
00:17:24,540 --> 00:17:30,625
>> Se konsa, kite a aktyèlman pran sa a
yon sèl etap pi lwen.

286
00:17:30,625 --> 00:17:34,050

287
00:17:34,050 --> 00:17:39,700
Apre sa, olye pou yo lè l sèvi avèk string.h, se pou yo
panse osijè de kòman nou ta aplike pwòp nou

288
00:17:39,700 --> 00:17:41,420
strlèn fonksyon.

289
00:17:41,420 --> 00:17:45,600
Se konsa, mwen pral ba imedyatman
yon siyati fonksyon.

290
00:17:45,600 --> 00:17:52,900
Se konsa, kite a rele nan my_strlen, epi li
pral pran yon kòd kòm yon diskisyon,

291
00:17:52,900 --> 00:17:57,220
e nou espere retounen nan
longè ki fisèl.

292
00:17:57,220 --> 00:18:03,430
Se konsa, kote se ke nèg?

293
00:18:03,430 --> 00:18:04,990
Wi.

294
00:18:04,990 --> 00:18:06,740
OK.

295
00:18:06,740 --> 00:18:12,900
Se konsa, sonje soti nan glise la pi bonè ke
te tou ki soti nan semèn pase a, ke yon

296
00:18:12,900 --> 00:18:18,890
etalaj de karaktè, byen, yon kòd,
Se konsa, kite a di sa a se nan fil nou an.

297
00:18:18,890 --> 00:18:29,870
Se konsa, si yo se fisèl la, hello, lè sa a,
H-E-L-L-O, nan memwa, ki nan ale nan

298
00:18:29,870 --> 00:18:35,610
dwe, ak Lè sa a, sa a antislach
0 karaktè.

299
00:18:35,610 --> 00:18:39,170
>> Se konsa, kouman nou jwenn longè a nan a?

300
00:18:39,170 --> 00:18:43,190
Oke, se jwe fent la kap chèche sa a
repèkisyon 0 karaktè, nil sa a

301
00:18:43,190 --> 00:18:44,380
Terminator.

302
00:18:44,380 --> 00:18:50,270
Se konsa, algorithm a pral
yo dwe yon bagay tankou kèk

303
00:18:50,270 --> 00:18:51,510
ase karaktè ki -

304
00:18:51,510 --> 00:18:56,180
kite a gen men sa a reprezante kèk
vann san preskripsyon, se pou yo rele sa longè Int.

305
00:18:56,180 --> 00:19:00,060
Se konsa, kòmanse soti nan plis pase isit la, nou ap
ale nan repňte sou fisèl nou an.

306
00:19:00,060 --> 00:19:04,100
>> Se konsa, karaktè a an premye, li nan H,
epi li pa la tounen koupe 0, se konsa

307
00:19:04,100 --> 00:19:05,170
longè a se 1.

308
00:19:05,170 --> 00:19:08,050
Repňte nan karaktè kap vini an,
E, epi li pa la antislach 0.

309
00:19:08,050 --> 00:19:09,630
Longè se 2.

310
00:19:09,630 --> 00:19:10,960
L, 3.

311
00:19:10,960 --> 00:19:11,850
L, 4.

312
00:19:11,850 --> 00:19:13,050
O, 5.

313
00:19:13,050 --> 00:19:16,690
E finalman, nou rive nan antislach
0, e konsa sa vle di, byen,

314
00:19:16,690 --> 00:19:17,780
fisèl sa a se sou.

315
00:19:17,780 --> 00:19:20,130
Se konsa, kite a retounen 5.

316
00:19:20,130 --> 00:19:33,630
>> Se konsa, aktyèlman mete ann aplikasyon sa a, premye,
longè n mwen an egal 0, men dwat mwen an.

317
00:19:33,630 --> 00:19:36,088
Apre sa, nou pral repňte -

318
00:19:36,088 --> 00:19:38,000
>> Oratè 1: [fèbl]

319
00:19:38,000 --> 00:19:38,640
>> ROB bodèn: Oh, tire.

320
00:19:38,640 --> 00:19:39,870
Bon apèl.

321
00:19:39,870 --> 00:19:42,680
Boom.

322
00:19:42,680 --> 00:19:44,140
Se konsa, n longè egal 0.

323
00:19:44,140 --> 00:19:46,910

324
00:19:46,910 --> 00:19:58,310
Se konsa, koulye a, longè pandan y ap s pa fè sa
egal ak Lè sa a, antislach 0.

325
00:19:58,310 --> 00:20:04,660
Se konsa, sonje, sa a antislach 0, li se yon
N. reyèl, epi li endike

326
00:20:04,660 --> 00:20:05,820
nan fen fisèl la.

327
00:20:05,820 --> 00:20:09,850
Jis tankou, tou, antislach
n se yon karaktè vrè.

328
00:20:09,850 --> 00:20:14,040
Antislach 0 ki pral endike
nan fen fisèl nou an.

329
00:20:14,040 --> 00:20:15,414
Mwen pa vle mete sa a.

330
00:20:15,414 --> 00:20:19,190

331
00:20:19,190 --> 00:20:25,620
Epi pandan ke y s Catalogue pa longè se pa
egal a Terminator a nil, lè sa a

332
00:20:25,620 --> 00:20:27,130
nou ap jis ale nan enkreman longè.

333
00:20:27,130 --> 00:20:29,860

334
00:20:29,860 --> 00:20:34,880
Se konsa, lè sa a, nan fen pwogram nou an,
longè ki evantyèlman ale nan

335
00:20:34,880 --> 00:20:37,610
gen 5 nan ka sa a.

336
00:20:37,610 --> 00:20:39,210
Epitou, n ap jis retounen longè.

337
00:20:39,210 --> 00:20:42,570

338
00:20:42,570 --> 00:20:43,530
>> OK.

339
00:20:43,530 --> 00:20:48,290
Se konsa, koulye desann isit la, mwen pa fè sa
fè my_strlen.

340
00:20:48,290 --> 00:20:50,700
Se pou nou konpile li nan asire w ke
tout bagay kouri fèt san pwoblèm.

341
00:20:50,700 --> 00:20:55,820

342
00:20:55,820 --> 00:20:58,210
Te mwen fè nan 2?

343
00:20:58,210 --> 00:21:00,565
Oswa te ke 1 an?

344
00:21:00,565 --> 00:21:01,940
Sa ta dwe fè.

345
00:21:01,940 --> 00:21:02,690
Tout dwa.

346
00:21:02,690 --> 00:21:08,490
Se konsa, sa a se argv 2.

347
00:21:08,490 --> 00:21:11,585
Travay kòm prevwa, byenke
te ke youn nan m 'te fè l' nan?

348
00:21:11,585 --> 00:21:15,060

349
00:21:15,060 --> 00:21:15,550
Wi.

350
00:21:15,550 --> 00:21:16,760
OK.

351
00:21:16,760 --> 00:21:21,820
Sa a vèsyon de bagay sa yo pa t 'gen
printf liy nan nouvo apre, men li

352
00:21:21,820 --> 00:21:22,910
pa fè okenn diferans.

353
00:21:22,910 --> 00:21:23,300
OK.

354
00:21:23,300 --> 00:21:25,780
Se konsa, te travay kòm espere.

355
00:21:25,780 --> 00:21:34,750
>> Koulye a, nou ka menm konbine etap sa a yon sèl
pi lwen, kote avi isit la, byen,

356
00:21:34,750 --> 00:21:38,920
premye, nou ap arachman strlèn a nan argv
mwen, ak Lè sa a, nou ap iteration sou

357
00:21:38,920 --> 00:21:41,450
chak karaktè nan ki fil.

358
00:21:41,450 --> 00:21:47,480
Se konsa, olye pou yo fè sa, ki sa ki si nou
jis konbine sa a lojik nan ap tann

359
00:21:47,480 --> 00:21:50,740
jiskaske nou frape antislach 0 dwa
nan sa a pou bouk?

360
00:21:50,740 --> 00:21:53,740

361
00:21:53,740 --> 00:22:07,490
Se konsa, repňte pandan y ap argv mwen, j fè
pa egal antislach 0.

362
00:22:07,490 --> 00:22:10,680
Se konsa, kite a kouri li an premye.

363
00:22:10,680 --> 00:22:19,838

364
00:22:19,838 --> 00:22:21,180
>> Tout dwa.

365
00:22:21,180 --> 00:22:27,655
Se konsa, isit la, kondisyon sa a ap di -

366
00:22:27,655 --> 00:22:38,090

367
00:22:38,090 --> 00:22:40,060
kite a klè ke.

368
00:22:40,060 --> 00:22:49,140
Se konsa, koulye a, se pou sa a gen argv nou an.

369
00:22:49,140 --> 00:22:55,290
Se konsa, lè mwen jis kouri pwogram sa a anvan,
argv se yon etalaj de strings.

370
00:22:55,290 --> 00:23:03,100
Se konsa, si mwen kouri li ak dot argv koupe
2, bonjou sou latè, Lè sa a, argv la

371
00:23:03,100 --> 00:23:07,650
tèt li se longè 3, pou argv
zewo, hello, ak nan lemonn.

372
00:23:07,650 --> 00:23:11,700

373
00:23:11,700 --> 00:23:19,660
>> Ak andedan nan chak nan endis sa yo se,
tèt li yon etalaj, kote sa a pral

374
00:23:19,660 --> 00:23:23,780
dot, sa a pral koupe, mwen pa konnen
si sa ki te bon direksyon an, mwen

375
00:23:23,780 --> 00:23:25,680
pa panse ke li te ye.

376
00:23:25,680 --> 00:23:30,110
A-R-V priz, bezwen plis espas.

377
00:23:30,110 --> 00:23:32,570
Se pou yo koupe nan etalaj sa a.

378
00:23:32,570 --> 00:23:38,230
A-R-V priz 0, epi Lè sa a, antislach 0.

379
00:23:38,230 --> 00:23:43,160
Lè sa a, nan tètchaje yo pral hello.

380
00:23:43,160 --> 00:23:45,910
Se pou nou di, H-E antislach 0.

381
00:23:45,910 --> 00:23:51,130
E finalman, W-O antislach 0.

382
00:23:51,130 --> 00:23:59,730
>> Se konsa, algorithm a ke nou jis te ekri,
pare solèy la pou pasan, ki sa ki yo ap

383
00:23:59,730 --> 00:24:07,321
fè se, nou gen nan premye
vann san preskripsyon mwen ak Lè sa a, j.

384
00:24:07,321 --> 00:24:15,206
Sa a ta ka pi fasil avèk kòd sou la
ekran, Se pou yo tounen nan sa a.

385
00:24:15,206 --> 00:24:17,476
OK.

386
00:24:17,476 --> 00:24:24,600
Se konsa, remake ke mwen se iterator a ki nan
iteration sou chak lòd

387
00:24:24,600 --> 00:24:25,610
liy agiman.

388
00:24:25,610 --> 00:24:28,870
Apre sa, j a se iteration nan iterator
sou chak karaktè nan ki

389
00:24:28,870 --> 00:24:30,410
lòd liy agiman.

390
00:24:30,410 --> 00:24:46,755
Se konsa, sa printf sa a entim ap fè
se, nou te printf argv 0 0, printf

391
00:24:46,755 --> 00:24:58,680
argv 0 1, printf argv 0 2, 0 3, 0 4, 0
5, 0, 6, men kounye a, argv 0 7 ki pral

392
00:24:58,680 --> 00:25:00,670
egal antislach 0.

393
00:25:00,670 --> 00:25:05,730
>> Se konsa, lè sa a nou sòti ki pou bouk,
e kounye a, mwen iterates a 1.

394
00:25:05,730 --> 00:25:10,910
Epi, koulye a nou pral ekri ak lèt ​​detache
argv 1 0, argv 1 1 -

395
00:25:10,910 --> 00:25:17,040
byen, kounye a, depi m 'koupe alo ti bout tan,
argv 1 2 se ankò pral fè

396
00:25:17,040 --> 00:25:18,170
antislach 0.

397
00:25:18,170 --> 00:25:25,050
Se konsa, enkreman mwen yo e yo kontinye, ak
sou sa, jouk nou enprime soti tout nan

398
00:25:25,050 --> 00:25:28,580
mond lan, ak sa yo se twa liy lòd
agiman, epi n ap sòti soti nan

399
00:25:28,580 --> 00:25:31,670
bouk ki pi aleksteryè, ak
fini pwogram nou an.

400
00:25:31,670 --> 00:25:38,390

401
00:25:38,390 --> 00:25:39,640
OK.

402
00:25:39,640 --> 00:25:43,903

403
00:25:43,903 --> 00:25:46,795
>> Se konsa, kite a va tounen isit la.

404
00:25:46,795 --> 00:25:49,670

405
00:25:49,670 --> 00:25:52,370
Se konsa, ou pral jwenn kèk abitye avèk
agiman liy lòd sa a sou

406
00:25:52,370 --> 00:25:54,460
pwoblèm patikilye mete.

407
00:25:54,460 --> 00:25:56,630
>> Koulye a, debogaj.

408
00:25:56,630 --> 00:26:01,680
Se konsa, ou pwobableman te deja te fè
kèk debogaj ak anvan ou

409
00:26:01,680 --> 00:26:03,120
pwoblèm mete.

410
00:26:03,120 --> 00:26:08,420
Apre sa, yon fason trè fasil nan debogaj,
premye, se pou yo gade nan yon pwogram buggy.

411
00:26:08,420 --> 00:26:20,710

412
00:26:20,710 --> 00:26:23,830
Oke, mache nan pwogram sa a,
nou pral mande itilizatè a pou yon

413
00:26:23,830 --> 00:26:29,350
nonb antye ki pè, gen tan pwan ke nonb antye ki pè, ak lè sa a,
abitrèman, nou gen yon bouk pandan y ap ki

414
00:26:29,350 --> 00:26:32,280
se jis ale nan dekrwasans
mwen jouk li a egal a 10.

415
00:26:32,280 --> 00:26:35,820
Se pou nou jis asime mwen k ap antre nan
yon nonb antye relatif ki pi gran pase 10.

416
00:26:35,820 --> 00:26:38,700
Se konsa, dekrwasans mwen jouk li a egal a 10.

417
00:26:38,700 --> 00:26:42,630
>> Lè sa a, nou gen yon lòt bouk pandan y ap
ki, pandan y ap mwen pa fè sa egal 0, nou ap

418
00:26:42,630 --> 00:26:44,540
ale nan dekrwasans mwen pa 3.

419
00:26:44,540 --> 00:26:49,790
Se konsa, si ou wè entansyon an nan pinèz la
isit la, li nan ke sa a pral dekrwasans m '

420
00:26:49,790 --> 00:26:57,010
gen 10, ak Lè sa a, sa a pral pandan y ap bouk
dekrwasans mwen soti nan 10, nan 7, a 4, a 1,

421
00:26:57,010 --> 00:27:02,880
negatif 2, nan negatif 5, ak sou sa,
Infinity negatif, depi m 'pral

422
00:27:02,880 --> 00:27:05,920
aktyèlman pa janm egal a 0.

423
00:27:05,920 --> 00:27:08,610
Lè sa a, nan fen pwogram sa a,
nou gen fonksyon an foo ki se

424
00:27:08,610 --> 00:27:12,130
ale sou ekri ak lèt ​​detache soti ke mwen.

425
00:27:12,130 --> 00:27:16,520
>> Se konsa, sa a se yon pwogram kout ak trivial,
ak pinèz la se evidan,

426
00:27:16,520 --> 00:27:18,790
sitou apre mwen jis
di ki sa pinèz la te ye a.

427
00:27:18,790 --> 00:27:24,840
Men, entansyon a isit la se, byen, sa a ta ka
aktyèlman gade tankou kèk nan ou

428
00:27:24,840 --> 00:27:30,040
solisyon soti nan visye ki soti nan dènye a
pwoblèm mete, ak petèt ou gen

429
00:27:30,040 --> 00:27:32,800
kèk bouk enfini nan pwogram ou an,
epi ou pa gen okenn lide

430
00:27:32,800 --> 00:27:34,100
sa ki sa ki lakòz li.

431
00:27:34,100 --> 00:27:38,690
Se konsa, yon teknik debogaj trè itil
se jis ajoute printfs

432
00:27:38,690 --> 00:27:40,180
tout lòt peyi sou Kòd ou.

433
00:27:40,180 --> 00:27:49,200
>> Se konsa, isit la mwen vle yon printf deyò
premye pandan y ap bouk.

434
00:27:49,200 --> 00:27:53,155
Ak isit la mwen vle yon printf,
epi mwen pral jis ekri ak lèt ​​detache mwen.

435
00:27:53,155 --> 00:27:55,670

436
00:27:55,670 --> 00:27:58,330
Mwen pral menm fè premye pandan y ap bouk, mwen.

437
00:27:58,330 --> 00:28:05,130

438
00:28:05,130 --> 00:28:09,040
Deyò, dezyèm pandan y ap bouk.

439
00:28:09,040 --> 00:28:12,170
Yon fwa ankò, ekri ak lèt ​​detache andedan
nan isit la, valè a mwen.

440
00:28:12,170 --> 00:28:16,270

441
00:28:16,270 --> 00:28:17,520
Li kite yo kouri sa a.

442
00:28:17,520 --> 00:28:22,620

443
00:28:22,620 --> 00:28:24,800
>> Se konsa, dot koupe debug.

444
00:28:24,800 --> 00:28:25,610
Antre nan yon nonb antye relatif.

445
00:28:25,610 --> 00:28:28,150
Se pou yo fè 13.

446
00:28:28,150 --> 00:28:28,760
Apre sa, boom.

447
00:28:28,760 --> 00:28:33,300
Nou wè ke nou se enfini loupin
andedan nan dezyèm bouk la pandan y ap.

448
00:28:33,300 --> 00:28:36,305
Se konsa, kounye a nou konnen ki sa ensèk la se.

449
00:28:36,305 --> 00:28:39,610

450
00:28:39,610 --> 00:28:45,610
Men, printf debogaj se parfe gwo,
men yon fwa pwogram ou jwenn

451
00:28:45,610 --> 00:28:50,560
pi long ak pi konplike, gen
solisyon pi plis sofistike

452
00:28:50,560 --> 00:28:51,705
ap resevwa bagay sa yo ap travay.

453
00:28:51,705 --> 00:28:52,955
Se konsa, kite a retire tout printfs sa yo.

454
00:28:52,955 --> 00:29:06,242

455
00:29:06,242 --> 00:29:08,896
Li kite yo asire yo ke mwen pa t '
kraze anyen.

456
00:29:08,896 --> 00:29:09,850
OK.

457
00:29:09,850 --> 00:29:14,180
>> Se konsa, pwogram lan nou pral
prezante yo rele

458
00:29:14,180 --> 00:29:16,715
Gdb, pou GNU debogeur.

459
00:29:16,715 --> 00:29:21,892

460
00:29:21,892 --> 00:29:27,510
Oke, aktyèlman, se pou yo retire debug pou
yon dezyèm fwa, epi fè debug ankò.

461
00:29:27,510 --> 00:29:31,420

462
00:29:31,420 --> 00:29:34,440
Oke, aktyèlman an premye, yon bon leson
nan lòd liy agiman.

463
00:29:34,440 --> 00:29:37,780
Remake lòd sa a sonnen se sa ki
konpile se tout bagay yo te pase

464
00:29:37,780 --> 00:29:41,300
nan liy lan lòd, sa yo
lòd liy agiman.

465
00:29:41,300 --> 00:29:46,250
Se konsa, egzakteman kouman ou yo pral lè l sèvi avèk
liy lòd agiman, jan nou

466
00:29:46,250 --> 00:29:51,500
te fè anvan, ak jan ou pral nan PSET
2, sa a, se ki jan sonnen se lè l sèvi avèk yo.

467
00:29:51,500 --> 00:30:00,070
>> Se konsa, remake ke sa a premye drapo, priz
ggdb3, ki sa ki ki nan di se, rezone,

468
00:30:00,070 --> 00:30:03,790
ou ta dwe konpile sa a ranpli ak nan
entansyon ke nou pral evantyèlman

469
00:30:03,790 --> 00:30:05,380
bezwen debug li.

470
00:30:05,380 --> 00:30:13,840
Se konsa, osi lontan ke ou genyen ki drapo,
Lè sa a, nou kapab gdb debug.

471
00:30:13,840 --> 00:30:17,380
Apre sa, li pral louvri moute GNU debogeur la.

472
00:30:17,380 --> 00:30:22,920
>> Se konsa, gen yon anpil nan kòmandman
ke ou bezwen jwenn itilize.

473
00:30:22,920 --> 00:30:27,100
Premye yon sèl ke ou ap pwobableman
imedyatman bezwen se kouri.

474
00:30:27,100 --> 00:30:28,200
Se konsa, sa se kouri pral fè?

475
00:30:28,200 --> 00:30:30,910
Li pral kòmanse pwogram nou an.

476
00:30:30,910 --> 00:30:36,180
Se konsa, kouri, pwogram kòmanse, pwogram nan
mande nou pou yon nonb antye ki pè, 13.

477
00:30:36,180 --> 00:30:39,170
Lè sa a, li la enfini loupin kòm
yo espere a, eksepte mwen retire nan

478
00:30:39,170 --> 00:30:40,500
printfs, se konsa nou pa menm wè sa.

479
00:30:40,500 --> 00:30:43,320

480
00:30:43,320 --> 00:30:44,600
Quitté nòmalman.

481
00:30:44,600 --> 00:30:45,850
Oh.

482
00:30:45,850 --> 00:30:48,570

483
00:30:48,570 --> 00:30:53,640
Li posib ke li vlope tout la
fason alantou li, tounen nan - inyore sa.

484
00:30:53,640 --> 00:30:55,170
Sipoze li pa t 'soti nan nòmalman.

485
00:30:55,170 --> 00:30:59,500

486
00:30:59,500 --> 00:31:03,370
Genyen yon repons konplike nan sa.

487
00:31:03,370 --> 00:31:07,890
>> Se konsa, kounye a, sa a pa trè itil.

488
00:31:07,890 --> 00:31:11,480
Se konsa, jis kouri pwogram nou an andedan nan
debugjeur sa a pa ede nou nan nenpòt ki

489
00:31:11,480 --> 00:31:15,610
fason sa a, depi nou te kapab jis fè
dot koupe debug soti an deyò de gdb.

490
00:31:15,610 --> 00:31:21,250
Se konsa, yo lòd, ki moun ki
Ou ap pwobableman -

491
00:31:21,250 --> 00:31:22,970
epi mwen pral kite sa-a.

492
00:31:22,970 --> 00:31:25,850
Kontwòl-d oswa ou kite, tou de travay.

493
00:31:25,850 --> 00:31:29,550
Se konsa, kite a louvri l 'ankò.

494
00:31:29,550 --> 00:31:31,130
>> Yon lòt lòd ke ou ap pwobableman
imedyatman vle

495
00:31:31,130 --> 00:31:33,600
jwenn itilize se Pak.

496
00:31:33,600 --> 00:31:37,120
Se konsa, nou pral kraze sou prensipal pou kounye a,
ak Lè sa a, mwen pral eksplike ke.

497
00:31:37,120 --> 00:31:41,010

498
00:31:41,010 --> 00:31:46,370
Oke, isit la nou wè nou mete yon breakpoint
nan liy sa a nan debug.c.

499
00:31:46,370 --> 00:31:50,160
Se konsa, sa ti repo vle di se ke lè m '
tape kouri, pwogram nan se ale nan

500
00:31:50,160 --> 00:31:53,560
kontinye kouri jouk
Mwen frape yon breakpoint.

501
00:31:53,560 --> 00:31:59,390
Se konsa, lè m 'frape kouri, pwogram nan kòmanse,
ak Lè sa a, li kraze le pli vit ke li

502
00:31:59,390 --> 00:32:01,940
antre nan fonksyon prensipal la.

503
00:32:01,940 --> 00:32:06,930
Kraze prensipal ki pral gen yon bagay
ou trè souvan fè.

504
00:32:06,930 --> 00:32:11,340
>> Epi, koulye a, nan entwodui ou
nan kèk kòmandman plis ankò.

505
00:32:11,340 --> 00:32:14,330
Avi isit la, ke li nan di nou
te kraze nan liy 11, ki se

506
00:32:14,330 --> 00:32:16,230
printf, antre nan yon nonb antye relatif.

507
00:32:16,230 --> 00:32:21,260
Se konsa, yo lòd, ki Next a pwal ki jan
nou ale nan liy nan pwochen nan kòd.

508
00:32:21,260 --> 00:32:24,810
Sa a se ale nan pèmèt nou nan etap
nan liy pwogram nou an pa liy.

509
00:32:24,810 --> 00:32:26,260
Se konsa, kap vini an.

510
00:32:26,260 --> 00:32:29,820
>> Koulye a, liy 12, nou pral
jwenn nonb antye ki pè a.

511
00:32:29,820 --> 00:32:30,450
Kap vini an.

512
00:32:30,450 --> 00:32:34,290
Ak si ou jis frape Antre ankò, li pral
refè bagay la pase ou te fè.

513
00:32:34,290 --> 00:32:36,480
Se konsa, mwen pa bezwen tape
pwochen chak fwa.

514
00:32:36,480 --> 00:32:40,100
Se konsa, antre nan yon nonb antye relatif, 13.

515
00:32:40,100 --> 00:32:46,940
Se konsa, koulye a, liy 14, pandan y ap mwen an gen plis pouvwa
pase 10, epi mwen pral fè pwochen.

516
00:32:46,940 --> 00:32:48,685
Lè nou wè nou pral dekrwasans mwen.

517
00:32:48,685 --> 00:32:50,210
Se konsa, nou ap ale nan dekrwasans mwen ankò.

518
00:32:50,210 --> 00:32:53,620
>> Se konsa, koulye a, yon lòt itil
lòd se Enprime.

519
00:32:53,620 --> 00:32:55,750
Se konsa, Enprime ki pral enprime soti
valè a nan varyab la.

520
00:32:55,750 --> 00:32:57,825
Se pou yo pote l 'valè a
nan varyab mwen.

521
00:32:57,825 --> 00:32:58,705
Se pou yo ekri ak lèt ​​detache mwen.

522
00:32:58,705 --> 00:33:00,910
Li pral di mwen se 11.

523
00:33:00,910 --> 00:33:03,330
Koulye a, nou Next ankò pandan y ap
mwen gen plis pouvwa pase 10.

524
00:33:03,330 --> 00:33:05,590
Se konsa, mwen la toujou pi gran pase
10, depi li nan 11.

525
00:33:05,590 --> 00:33:06,920
mwen mwens mwens.

526
00:33:06,920 --> 00:33:08,250
Se pou yo ekri ak lèt ​​detache mwen ankò.

527
00:33:08,250 --> 00:33:10,950
Kòm espere, li la 10.

528
00:33:10,950 --> 00:33:12,510
>> Se konsa, kounye a, kap vini an.

529
00:33:12,510 --> 00:33:16,250
Li pral tounen nan kondisyon an, mwen se
pi gran pase 10, men mwen se kounye a 10, Se konsa,

530
00:33:16,250 --> 00:33:20,040
li pa pi plis pase 10, se konsa nou espere
li soti tonbe nan bouk la pandan y ap.

531
00:33:20,040 --> 00:33:22,220
Epi, koulye a nou ap anba a ki liy nan kòd.

532
00:33:22,220 --> 00:33:28,750
Ak yon lòt lòd, Lis, se jis ale
an montre anvan an ak pwochen

533
00:33:28,750 --> 00:33:31,240
koup la liy nan Kòd, nan
ka ou pèdi tèt ou.

534
00:33:31,240 --> 00:33:35,420
Se konsa, nou jis quitté sa a bouk ti tan,
epi kounye a nou gen antre nan sa a

535
00:33:35,420 --> 00:33:37,080
pandan y ap bouk, liy 18.

536
00:33:37,080 --> 00:33:39,860
Se konsa, pandan mwen pa fè sa egal 0.

537
00:33:39,860 --> 00:33:46,570
Epi, kap vini an, mwen egal mwen mwens 3, epi n ap
avi, sa a pral jis kenbe prale.

538
00:33:46,570 --> 00:33:48,270
Apre sa, nou ka ekri ak lèt ​​detache mwen.

539
00:33:48,270 --> 00:33:49,990
>> Chak lòd sòt de gen rakoursi.

540
00:33:49,990 --> 00:33:51,720
Se konsa, p se kout pou Ekri an lèt detache.

541
00:33:51,720 --> 00:33:53,400
Se konsa, nou kapab p mwen.

542
00:33:53,400 --> 00:33:57,550
Jis kenbe kenbe n,
oswa kontinye ap fè kap vini an.

543
00:33:57,550 --> 00:33:58,340
Enprime mwen ankò.

544
00:33:58,340 --> 00:34:00,380
Ou wè kounye a li nan negatif 167.

545
00:34:00,380 --> 00:34:06,030
Se konsa, sa a pral ale sou pou tout tan, men se pa
vrèman pou tout tan, depi ou jis te wè, li

546
00:34:06,030 --> 00:34:09,330
aktyèlman ap fini nan kèk pwen.

547
00:34:09,330 --> 00:34:15,699
>> Se konsa, ki se Kòmanse gdb.

548
00:34:15,699 --> 00:34:19,504
Men, kite a fè yon bagay plis nan gdb.

549
00:34:19,504 --> 00:34:20,754
Uh, debug.

550
00:34:20,754 --> 00:34:23,540

551
00:34:23,540 --> 00:34:28,534
Se konsa, nan ka sa a an patikilye, nan
enfini bouk ki te pase yo dwe andedan nan

552
00:34:28,534 --> 00:34:30,050
fonksyon prensipal la.

553
00:34:30,050 --> 00:34:35,779
Se pou kounye a, jis aksepte ke ke mwen se
ale pou avanse pou pi bouk la enfini nan

554
00:34:35,779 --> 00:34:37,029
fonksyon an foo.

555
00:34:37,029 --> 00:34:40,679

556
00:34:40,679 --> 00:34:43,730
Jis sonje ke, nan fen sa a
pwogram, byen, sa a te orijinal

557
00:34:43,730 --> 00:34:46,210
rele foo, sa ki te jis
ale nan ekri ak lèt ​​detache mwen.

558
00:34:46,210 --> 00:34:51,880
Men koulye a, nou ap rele foo, ki se
ale nan dekrwasans mwen jouk li a 0, epi

559
00:34:51,880 --> 00:34:54,548
Lè sa a, ekri ak lèt ​​detache varyab sa a.

560
00:34:54,548 --> 00:34:55,469
OK.

561
00:34:55,469 --> 00:34:57,970
Delivre sa.

562
00:34:57,970 --> 00:35:00,175
Fè debug.

563
00:35:00,175 --> 00:35:03,310
Koulye a, gdb debug.

564
00:35:03,310 --> 00:35:04,090
OK.

565
00:35:04,090 --> 00:35:10,580
>> Se konsa, si mwen jis kouri Lè sa a, mwen pa ale nan
kapab aktyèlman etap nan mwen

566
00:35:10,580 --> 00:35:11,730
liy-pa-liy pwogram nan.

567
00:35:11,730 --> 00:35:19,820
Se konsa, kite a kraze nan prensipal yo,
ak Lè sa a, tape kouri.

568
00:35:19,820 --> 00:35:28,160
Se konsa, ale nan sa a, printf, antre nan
yon nonb antye relatif, jwenn nonb antye ki pè a, 13.

569
00:35:28,160 --> 00:35:34,180

570
00:35:34,180 --> 00:35:37,490
Se konsa, nou ap ale nan kenbe decrementing
jouk tan mwen gen plis pouvwa pase 10.

571
00:35:37,490 --> 00:35:42,840
Lè sa a, nou pral tonbe nan la
pandan y ap bouk, epi pou yo jwenn nan liy lan -

572
00:35:42,840 --> 00:35:44,364
kite a louvri li moute nan yon fennèt apa a.

573
00:35:44,364 --> 00:35:48,720

574
00:35:48,720 --> 00:35:53,300
Se konsa, nou dekremante jouk tan mwen te gen okenn ankò
pi gran pase 10, ak Lè sa a, nou

575
00:35:53,300 --> 00:35:55,700
rele fonksyon an, foo.

576
00:35:55,700 --> 00:36:01,340
>> Se konsa, sa ki te pase le pli vit ke mwen frape
foo fonksyon, byen, mwen te rele foo, ak

577
00:36:01,340 --> 00:36:04,030
Lè sa a, mwen pa gen okenn ankò te gen kontwòl sou gdb.

578
00:36:04,030 --> 00:36:10,230
Se konsa, le pli vit ke mwen frape Next nan liy sa a,
bagay sa yo kontinye jouk sa a te pase a,

579
00:36:10,230 --> 00:36:12,400
kote pwogram lan quitté lè -

580
00:36:12,400 --> 00:36:14,450
sipoze li pa t 'egziste evantyèlman.

581
00:36:14,450 --> 00:36:16,390
Ou te wè sa pran yon poz pou yon ti jan si.

582
00:36:16,390 --> 00:36:22,040
Se konsa, poukisa mwen te pèdi kontwòl sou
pwogram lan nan pwen sa?

583
00:36:22,040 --> 00:36:27,540
Oke, lè mwen tape kap vini an, ki ale nan
literal liy nan pwochen nan kòd ki

584
00:36:27,540 --> 00:36:28,850
ap egzekite.

585
00:36:28,850 --> 00:36:35,950
Se konsa, apre liy 21, liy nan pwochen nan Kòd
ki pral egzekite se liy 22,

586
00:36:35,950 --> 00:36:38,520
ki se, elèv la kite prensipal la.

587
00:36:38,520 --> 00:36:43,810
Se konsa, mwen pa vle jis ale
nan liy lan pwochen nan kòd.

588
00:36:43,810 --> 00:36:48,170
Mwen vle ale nan fonksyon, foo a,
ak Lè sa a, tou etap nan

589
00:36:48,170 --> 00:36:49,830
moun ki liy nan kòd.

590
00:36:49,830 --> 00:36:53,726
>> Se konsa, pou ke, nou gen yon altènatif.

591
00:36:53,726 --> 00:36:56,770
Se pou nou kite sa ankò.

592
00:36:56,770 --> 00:36:58,020
Kraze prensipal la.

593
00:36:58,020 --> 00:37:00,520

594
00:37:00,520 --> 00:37:06,370
Uh, 1, apre, pwochèn nan, 13, kap vini an,
kap vini an, kap vini an, ak anpil atansyon,

595
00:37:06,370 --> 00:37:09,820
anvan nou frape liy foo.

596
00:37:09,820 --> 00:37:10,520
OK.

597
00:37:10,520 --> 00:37:13,700
>> Se konsa, koulye a, nou ap nan liy 21,
kote nou rele foo.

598
00:37:13,700 --> 00:37:17,100
Nou pa vle tape kap vini an, depi ke
pral jis rele foo an fonksyon, ak

599
00:37:17,100 --> 00:37:18,710
ale nan liy nan pwochen nan kòd.

600
00:37:18,710 --> 00:37:20,840
Ki sa nou vle sèvi ak se Etap.

601
00:37:20,840 --> 00:37:25,690
Se konsa, gen nan yon diferans ant Etap
ak Apre sa, kote Etap etap nan la

602
00:37:25,690 --> 00:37:28,190
fonksyone, ak pwochen ale
sou fonksyon an.

603
00:37:28,190 --> 00:37:32,830
Li jis ègzekutra antye nan
fonksyon an ak kenbe prale.

604
00:37:32,830 --> 00:37:37,210
>> Se konsa, Etap ki pral mennen nou
nan fonksyon an, foo.

605
00:37:37,210 --> 00:37:41,160
Lè nou wè isit la, kounye a, nou ap tounen nan
sa a bouk pandan y ap sa a, se, nan teyori,

606
00:37:41,160 --> 00:37:44,190
pral kontinye pou tout tan.

607
00:37:44,190 --> 00:37:50,420
Men, si ou frape Etap, lè li se pa menm
yon fonksyon yo rele, lè sa a li nan

608
00:37:50,420 --> 00:37:51,720
ki idantik ak pwochen an.

609
00:37:51,720 --> 00:37:55,320
Se konsa, li a sèlman lè w ap nan yon liy ki
ap rele yon fonksyon ki etap

610
00:37:55,320 --> 00:37:56,970
ki pral diferan de kap vini an.

611
00:37:56,970 --> 00:37:57,930
Se konsa, Etap ap fè nou isit la.

612
00:37:57,930 --> 00:38:02,100
Etap, etap, etap, etap, etap, etap, ak
nou pral jis enfini bouk pou tout tan.

613
00:38:02,100 --> 00:38:06,810
>> Se konsa, ou ta ka jwenn itilize sa a kòm ou
fason pou idantifye pasan enfini, se

614
00:38:06,810 --> 00:38:08,960
jis kenbe sa a antre nan kle yo
wè ki kote ou jwenn kole.

615
00:38:08,960 --> 00:38:11,610

616
00:38:11,610 --> 00:38:14,780
Gen pi bon fason yo fè sa, men
pou kounye a, se sa ki parfe ase.

617
00:38:14,780 --> 00:38:17,967
Apre sa, estilitikman, nan konfòme yo ak Style
50, mwen ta dwe fè sa a.

618
00:38:17,967 --> 00:38:21,550

619
00:38:21,550 --> 00:38:24,030
OK.

620
00:38:24,030 --> 00:38:28,400
>> Se konsa, yon dènye lòd prezante.

621
00:38:28,400 --> 00:38:30,810
Oke, kite la gdb debug pous

622
00:38:30,810 --> 00:38:35,580
Se konsa, olye pou yo kraze nan prensipal yo, si mwen
konnen fonksyon an foo se tou nan

623
00:38:35,580 --> 00:38:39,230
pwoblèm, Lè sa a, mwen te kapab gen sèlman
te di, kraze nan foo, olye pou.

624
00:38:39,230 --> 00:38:42,310
Se pou nou di mwen kraze nan
tou de pwensipal yo ak foo.

625
00:38:42,310 --> 00:38:45,390
Se konsa, ou ka mete kòm anpil breakpoints
jan ou vle.

626
00:38:45,390 --> 00:38:49,230
Lè m 'tape kouri, li pral
yo sispann nan a -

627
00:38:49,230 --> 00:38:52,180
Ooh, se pou yo compile, depi
Mwen chanje bagay sa yo.

628
00:38:52,180 --> 00:38:55,950
Ou pral wè liy sa a, avètisman, sous
dosye a se pi plis ki sot pase pase ègzèkutabl.

629
00:38:55,950 --> 00:38:59,680
Se konsa, ki vle di ke mwen jis te ale nan isit la
Li chanje sa yo konfòme yo ak Style

630
00:38:59,680 --> 00:39:03,100
50, men mwen pa t 'compile
pwogram lan.

631
00:39:03,100 --> 00:39:04,870
Se konsa, gdb fè m 'okouran de sa.

632
00:39:04,870 --> 00:39:10,130
Mwen pral kite fimen, fè debug ankò,
frape gdb debug.

633
00:39:10,130 --> 00:39:10,700
OK.

634
00:39:10,700 --> 00:39:12,800
>> Se konsa, koulye a, tounen nan sa mwen te fè a.

635
00:39:12,800 --> 00:39:15,720
Kraze prensipal yo, kraze foo.

636
00:39:15,720 --> 00:39:20,680
Koulye a, si mwen kouri pwogram nan, se konsa li a
ale nan kontinye jiskaske frape yon

637
00:39:20,680 --> 00:39:21,320
breakpoint.

638
00:39:21,320 --> 00:39:24,680
Sa breakpoint k ap pase nan
fè yon sèl la an premye nan prensipal la.

639
00:39:24,680 --> 00:39:28,630
Koulye a, olye pou yo fè apre, pwochèn nan, apre,
apre, pwochèn nan, jouk tan mwen frape foo, mwen

640
00:39:28,630 --> 00:39:35,230
ka tape kontinye, ki ap kontinye
jiskaske ou frape breakpoint nan pwochen an.

641
00:39:35,230 --> 00:39:37,200
Mwen gen antre nan nonb antye ki pè a an premye.

642
00:39:37,200 --> 00:39:40,570
Kontinye ap kontinye jouk tan mwen frape nan
pwochen breakpoint, ki se ki

643
00:39:40,570 --> 00:39:43,320
fonksyon nan foo.

644
00:39:43,320 --> 00:39:50,130
>> Se konsa, kouri pral kouri jiskaske ou frape yon
breakpoint, men ou sèlman tape kouri lè

645
00:39:50,130 --> 00:39:54,060
w ap kòmanse pwogram nan, ak Lè sa a,
soti nan Lè sa a, sou, li la kontinye.

646
00:39:54,060 --> 00:40:01,950
Si mwen jis te fè kraze prensipal ak
Lè sa a, kouri, li pral kraze a

647
00:40:01,950 --> 00:40:03,670
prensipal yo, ak Lè sa a kontinye.

648
00:40:03,670 --> 00:40:10,050
Depi mwen pa gen yon pwen kraze nan foo,
antre nan nonb antye ki pè a, Lè sa a, koulye a, mwen se

649
00:40:10,050 --> 00:40:11,380
pa ale nan kraze nan foo.

650
00:40:11,380 --> 00:40:16,318
Se jis ale nan enfini
bouk jouk sa.

651
00:40:16,318 --> 00:40:17,568
OK.

652
00:40:17,568 --> 00:40:19,500

653
00:40:19,500 --> 00:40:24,420
>> Se konsa, sa a, se Entwodiksyon nan gdb.

654
00:40:24,420 --> 00:40:27,790
Ou ta dwe kòmanse lè l sèvi avèk li
nan aparèy televisyon HD pwoblèm ou an.

655
00:40:27,790 --> 00:40:30,550
Li kapab trè itil
yo idantifye pinèz.

656
00:40:30,550 --> 00:40:35,280
Si ou aktyèlman jis, liy-pa-liy, ale
nan Kòd ou, epi konpare sa ki

657
00:40:35,280 --> 00:40:39,740
aktyèlman pase ak sa w ap atann
rive, Lè sa a, li a trè

658
00:40:39,740 --> 00:40:41,060
difisil yo kapab manke pinèz ou.

659
00:40:41,060 --> 00:40:45,280

660
00:40:45,280 --> 00:40:46,530
OK.

661
00:40:46,530 --> 00:40:48,310

662
00:40:48,310 --> 00:40:54,040
>> Se konsa, semèn pase a David te fè sa a
sekrè-kle bagay chifreman pou la

663
00:40:54,040 --> 00:40:59,350
premye fwa, kote nou pa vle
modpas jis dwe estoke sou nou

664
00:40:59,350 --> 00:41:03,210
òdinatè nan kèk dosye tèks plenn, kote
yon moun ka vin sou yo ak jis

665
00:41:03,210 --> 00:41:04,660
louvri li leve, li li yo.

666
00:41:04,660 --> 00:41:07,530
Idealman, yo ta dwe chiffres
nan kèk fason.

667
00:41:07,530 --> 00:41:13,340
Ak nan Pwoblèm Set 2, ou pral fè fas
ak yon sèl metòd pou chifreman,

668
00:41:13,340 --> 00:41:16,520
oswa, byen, de metòd, men
yo menm yo pa tèlman gwo.

669
00:41:16,520 --> 00:41:20,050
Si ou fè sa edisyon an HACKER, w ap
tou yo pral fè fas ak

670
00:41:20,050 --> 00:41:22,150
dechifre kèk bagay sa yo.

671
00:41:22,150 --> 00:41:29,770
>> Se konsa, pwoblèm nan kounye a se, byen, menm si
nou gen chifreman ki te pi fò

672
00:41:29,770 --> 00:41:34,830
algorithm nan mond lan, si ou chwazi yon
patikilyèman pòv modpas, Lè sa a, li

673
00:41:34,830 --> 00:41:37,720
pa pral ede w anpil, depi moun
ap toujou kapab figi li soti.

674
00:41:37,720 --> 00:41:41,530
Menm si wè fisèl la chiffres ak
li sanble yon dezòd nan fatra

675
00:41:41,530 --> 00:41:44,760
sa vle di pa gen anyen yo, si yo
toujou jis bezwen eseye yon modpas kèk

676
00:41:44,760 --> 00:41:50,560
figi li soti, lè sa a ou
yo pa twò ki an sekirite.

677
00:41:50,560 --> 00:41:55,890
Se konsa, l ap gade yon videyo ki
fè pwen sa.

678
00:41:55,890 --> 00:41:59,587

679
00:41:59,587 --> 00:42:00,970
>> [VIDEO lèktur]

680
00:42:00,970 --> 00:42:02,100
>> -Kask, ou anraje.

681
00:42:02,100 --> 00:42:03,370
Sa k ap pase sou?

682
00:42:03,370 --> 00:42:05,170
Kisa ou ap fè bay pitit fi mwen an?

683
00:42:05,170 --> 00:42:09,910
>> -Kite m prezante briyan nan
jèn chirijyen plastik, Dr Phillip

684
00:42:09,910 --> 00:42:13,730
Schlotkin, nen an pi gran
moun travay nan tout la

685
00:42:13,730 --> 00:42:16,080
linivè, ak Beverly Hills.

686
00:42:16,080 --> 00:42:17,210
>> -Ou Samajeste.

687
00:42:17,210 --> 00:42:18,070
>> -Nen travay?

688
00:42:18,070 --> 00:42:18,670
Mwen pa konprann.

689
00:42:18,670 --> 00:42:20,090
Li te te deja gen yon travay nen yo.

690
00:42:20,090 --> 00:42:21,910
Se te yon dous sèz prezan.

691
00:42:21,910 --> 00:42:22,140
>> -Non.

692
00:42:22,140 --> 00:42:23,690
Li pa sa w panse.

693
00:42:23,690 --> 00:42:25,420
Li nan anpil, anpil vin pi mal.

694
00:42:25,420 --> 00:42:30,300
Si ou pa ban m 'konbinezon nan
plak pwotèj li a lè, Dr Schlotkin pral

695
00:42:30,300 --> 00:42:34,226
bay pitit fi ou tounen nen fin vye granmoun li.

696
00:42:34,226 --> 00:42:35,476
>> -Non.

697
00:42:35,476 --> 00:42:38,712

698
00:42:38,712 --> 00:42:40,516
Ki kote ou t 'jwenn sa?

699
00:42:40,516 --> 00:42:41,440
>> -Tout dwa.

700
00:42:41,440 --> 00:42:42,180
Mwen pral di.

701
00:42:42,180 --> 00:42:43,381
Mwen pral di.

702
00:42:43,381 --> 00:42:44,263
Pa gen, papa.

703
00:42:44,263 --> 00:42:45,590
Non, ou pa dwe fèt la.

704
00:42:45,590 --> 00:42:46,860
>> -You're dwat, mwen renmen anpil.

705
00:42:46,860 --> 00:42:48,450
Mwen pral manke nen nouvo ou.

706
00:42:48,450 --> 00:42:52,090
Men, mwen pa pral di l 'konbinezon an,
pa gen pwoblèm sa.

707
00:42:52,090 --> 00:42:53,680
>> -Trè byen.

708
00:42:53,680 --> 00:42:55,685
Dr Schlotkin, fè pi mal ou.

709
00:42:55,685 --> 00:42:56,914
>> -Mwen plezi.

710
00:42:56,914 --> 00:43:00,690
>> [ZOUTI YO file]

711
00:43:00,690 --> 00:43:01,910
>> -Non.

712
00:43:01,910 --> 00:43:02,520
Rete tann.

713
00:43:02,520 --> 00:43:03,836
Rete tann.

714
00:43:03,836 --> 00:43:05,300
Mwen pral di.

715
00:43:05,300 --> 00:43:06,880
Mwen pral di.

716
00:43:06,880 --> 00:43:09,130
>> -Mwen te konnen li ta travay.

717
00:43:09,130 --> 00:43:09,900
Tout dwa.

718
00:43:09,900 --> 00:43:12,850
Ba li avè m '.

719
00:43:12,850 --> 00:43:16,918
>> -Konbinezon a se youn.

720
00:43:16,918 --> 00:43:17,406
>> -Yon.

721
00:43:17,406 --> 00:43:18,382
>> -Yon.

722
00:43:18,382 --> 00:43:19,358
>> -De.

723
00:43:19,358 --> 00:43:19,846
>> -De.

724
00:43:19,846 --> 00:43:20,822
>> -De.

725
00:43:20,822 --> 00:43:21,310
>> -Twa.

726
00:43:21,310 --> 00:43:21,798
>> -Twa.

727
00:43:21,798 --> 00:43:22,774
>> -Twa.

728
00:43:22,774 --> 00:43:23,262
>> -Kat.

729
00:43:23,262 --> 00:43:23,750
>> -Kat.

730
00:43:23,750 --> 00:43:26,150
>> -Kat.

731
00:43:26,150 --> 00:43:27,010
>> -Senk.

732
00:43:27,010 --> 00:43:27,670
>> -Senk.

733
00:43:27,670 --> 00:43:29,010
>> -Senk.

734
00:43:29,010 --> 00:43:34,770
>> -Se konsa, konbinezon an se youn,
de, twa, kat, senk.

735
00:43:34,770 --> 00:43:37,460
Sa a konbinezon an estipid
Mwen janm tande nan lavi mwen.

736
00:43:37,460 --> 00:43:39,710
Sa a ki kalite bagay yon moun sòt
ta gen sou bagaj l 'yo.

737
00:43:39,710 --> 00:43:42,000
>> -Mèsi, Samajeste.

738
00:43:42,000 --> 00:43:43,530
>> -Ki sa ou te fè?

739
00:43:43,530 --> 00:43:44,490
>> -Mwen etenn miray la.

740
00:43:44,490 --> 00:43:45,420
>> -Pa gen ou pa t '.

741
00:43:45,420 --> 00:43:45,840
Ou etenn fim nan tout antye.

742
00:43:45,840 --> 00:43:46,930
>> -Mwen dwe te bourade bouton an mal.

743
00:43:46,930 --> 00:43:48,265
>> -Bon, mete l 'tounen sou.

744
00:43:48,265 --> 00:43:49,110
Mete fim nan tounen sou.

745
00:43:49,110 --> 00:43:49,510
>> -Wi, mesye.

746
00:43:49,510 --> 00:43:49,917
Wi, mesye.

747
00:43:49,917 --> 00:43:50,324
>> -Ann al, Arnold.

748
00:43:50,324 --> 00:43:51,140
Vini non, Gretchen.

749
00:43:51,140 --> 00:43:53,060
Natirèlman, ou konnen mwen pral toujou
gen pou voye bòdwo pou ou pou sa a.

750
00:43:53,060 --> 00:43:53,440
>> [FEN VIDEO lèktur]

751
00:43:53,440 --> 00:43:54,690
>> ROB bodèn: Tout dwat.

752
00:43:54,690 --> 00:43:59,690

753
00:43:59,690 --> 00:44:08,430
Se konsa, kounye a ke nou ap deja ap pale de
sekirite nan kèk fason, bèl

754
00:44:08,430 --> 00:44:16,050
afich fim ti kras, se konsa nan ki sot pase
jou, pwoblèm sa yo ak NSA la

755
00:44:16,050 --> 00:44:17,300
kontwole tout bagay.

756
00:44:17,300 --> 00:44:21,840

757
00:44:21,840 --> 00:44:26,930
Li kapab difisil a santi tankou ou
gen kèk sòt de vi prive nan la

758
00:44:26,930 --> 00:44:34,540
sou entènèt nan lemonn, byenke mwen pa t 'kapab di
ou pi fò nan detay yo nan pris.

759
00:44:34,540 --> 00:44:42,130
Se konsa, k ap deplase pi lwen pase prism, nou pa ap ale
yo dwe pale sou sa, koulye a

760
00:44:42,130 --> 00:44:44,030
panse osijè de laptop ou.

761
00:44:44,030 --> 00:44:48,360
Se konsa, Moute bò isit, mwen vle chanje
nan kont aktyèl m 'yo,

762
00:44:48,360 --> 00:44:50,370
ak pengwen ti kras mwen.

763
00:44:50,370 --> 00:44:57,310
Se konsa, mwen gen yon seri modpas, e ke sa
modpas se tou sa mwen vle li yo dwe.

764
00:44:57,310 --> 00:45:02,430
>> Men sonje ke sa m ap ouvri sesyon
nan ak, se konsa login sa a

765
00:45:02,430 --> 00:45:04,850
rapid, se kèk nan pwogram nan.

766
00:45:04,850 --> 00:45:07,910
Li nan kèk pwogram ki te
ekri pa kèk moun.

767
00:45:07,910 --> 00:45:13,250
Se konsa, moun sa a, si yo
patikilyèman move, yo te kapab

768
00:45:13,250 --> 00:45:17,780
te di, tout dwa, Se konsa, si modpas la
ke mwen antre nan ki egal a mwen

769
00:45:17,780 --> 00:45:22,800
aktyèl modpas, oswa li a egal
nan kèk modpas espesyal -

770
00:45:22,800 --> 00:45:25,550
David se pè oubyen yon bagay -

771
00:45:25,550 --> 00:45:27,190
Lè sa a, se pou yo pous

772
00:45:27,190 --> 00:45:33,760
Se konsa, yon pwogramè move te kapab gen
aksè a tout nan Macs ou, oswa

773
00:45:33,760 --> 00:45:36,150
Fenèt yo, oswa nenpòt bagay.

774
00:45:36,150 --> 00:45:41,980
>> Se konsa, ki se pa anpil nan yon enkyetid, depi,
Mwen vle di, sa a se pwogram login

775
00:45:41,980 --> 00:45:48,720
ki nan anbake ak OS X, dè santèn
oswa dè milye de moun ki gen

776
00:45:48,720 --> 00:45:50,020
revize Kòd sa a.

777
00:45:50,020 --> 00:45:55,330
Se konsa, si, nan Kòd ou yon kote, ou
di si fisèl sa a egal egal

778
00:45:55,330 --> 00:45:58,860
David se pè, login, Lè sa a, yon moun nan
pral fè, tankou, rete tann.

779
00:45:58,860 --> 00:45:59,800
Sa a se pa dwat.

780
00:45:59,800 --> 00:46:01,790
Sa a pa ta dwe isit la.

781
00:46:01,790 --> 00:46:06,650
Se konsa, sa a, se youn nan fason nou resevwa bagay sa yo
yo dwe kalite ki an sekirite.

782
00:46:06,650 --> 00:46:10,300
>> Men, panse osijè de pwogram menm
ke ou ekri.

783
00:46:10,300 --> 00:46:13,000
Se pou nou di ou te ekri pwogram nan login.

784
00:46:13,000 --> 00:46:20,440
Se konsa, pwogram sa a login ke ou te ekri,
Se konsa, evidamman, ou se yon bon

785
00:46:20,440 --> 00:46:21,210
pwogramè.

786
00:46:21,210 --> 00:46:25,610
Ou pa ap ale nan mete nenpòt move
si x egal egal David se pè

787
00:46:25,610 --> 00:46:27,860
nan Kòd ou.

788
00:46:27,860 --> 00:46:31,930
Men, pwogram sa a, sa ki fè ou
sèvi ak konpile pwogram sa a?

789
00:46:31,930 --> 00:46:34,180
Yon bagay tankou sonnen.

790
00:46:34,180 --> 00:46:38,460
Se konsa, sa si moun nan ki te rive
ekri sonnen espesyal gèn nan rezone

791
00:46:38,460 --> 00:46:44,310
yon bagay tankou, si mwen konpile nan
konekte pwogram nan, Lè sa a, antre kòd sa a

792
00:46:44,310 --> 00:46:49,720
nan pwogram lan login ki di, si
x egal egal David te pè?

793
00:46:49,720 --> 00:46:59,890
Se konsa, pa byen ankò, men nou gen menm bagay la tou
bay isit la, kote sonnen, byen,

794
00:46:59,890 --> 00:47:03,790
dè milye, si se pa dè dizèn de milye nan
moun, yo te gade sonnen yo, yo gen

795
00:47:03,790 --> 00:47:07,160
gade liy li yo nan Kòd, li di:
tout dwa, gen nan pa gen anyen move isit la.

796
00:47:07,160 --> 00:47:10,680
Li evidan, pa gen yon sèl ap fè
anyen sa a move.

797
00:47:10,680 --> 00:47:15,780
>> Men, sa ki se rezone tèt li, tankou,
E si mwen konpile sonnen?

798
00:47:15,780 --> 00:47:20,900
E si mwen gen kèk du ki
compiles rezone ke foure nan rezone

799
00:47:20,900 --> 00:47:25,610
sa a Hack espesyal ki di, tout dwa,
lè m 'konpile sonnen, lè sa a nan

800
00:47:25,610 --> 00:47:31,290
ègzèkutabl mwen jwenn yo ta dwe espesyalman gade
andedan nan pwogram nan login ak insert

801
00:47:31,290 --> 00:47:34,230
sa a modpas, egal egal
Dave se pè?

802
00:47:34,230 --> 00:47:37,990
Se konsa, sonje ke du ou tèt li
bezwen yo dwe konpile nan kèk pwen.

803
00:47:37,990 --> 00:47:42,810
Se konsa, si sa ou chwazi yo konpile rezone
ak, tèt li se move, Lè sa a, ou

804
00:47:42,810 --> 00:47:45,580
ta ka vise tout la
fason desann liy lan.

805
00:47:45,580 --> 00:47:49,630
>> Se konsa, isit la, nou gen Ken Thompson
ak Dennis Ritchie.

806
00:47:49,630 --> 00:47:53,780
Se konsa, sa a se yon foto Iconiţă.

807
00:47:53,780 --> 00:47:55,470
Dennis Ritchie se sou bò dwat la.

808
00:47:55,470 --> 00:47:58,740
Li se yon gwo -

809
00:47:58,740 --> 00:48:03,640
bèl anpil te ekri C. Se konsa, ou kapab
di li mèsi pou klas sa a.

810
00:48:03,640 --> 00:48:04,840
Ken Thomson nan sou bò gòch la.

811
00:48:04,840 --> 00:48:07,780
De a yo fondamantalman ekri UNIX.

812
00:48:07,780 --> 00:48:10,140
Oke, yo te gwo kontribye
nan UNIX.

813
00:48:10,140 --> 00:48:11,310
Te gen kèk lòt moun.

814
00:48:11,310 --> 00:48:16,240
Se konsa, Ken Thompson, nan kèk pwen,
li ranport prim lan Turing.

815
00:48:16,240 --> 00:48:20,860
Apre sa, prim lan Turing, Mwen te toujou tande
li referans fason sa a, li la a

816
00:48:20,860 --> 00:48:23,100
Pri nobèl nan syans òdinatè.

817
00:48:23,100 --> 00:48:27,500
>> Se konsa, nan prim lan Turing, li te gen yo
bay diskou aksepte l 'yo.

818
00:48:27,500 --> 00:48:31,790
Apre sa, li bay sa a diskou trè popilè
kounye a, yo rele Refleksyon sou mete konfyans

819
00:48:31,790 --> 00:48:35,620
Trust, nou te lye
sou sit entènèt la kou.

820
00:48:35,620 --> 00:48:41,670
Apre sa, nan diskou sa a, li te di, tout dwa,
Se konsa, mwen te ekri UNIX, epi kounye a tout moun nan

821
00:48:41,670 --> 00:48:43,320
ou moun yo lè l sèvi avèk UNIX.

822
00:48:43,320 --> 00:48:46,960
Koulye a, sonje jodi a ke Linux se
yon pitit dirèk nan UNIX.

823
00:48:46,960 --> 00:48:50,140
OS X dirèkteman sèvi ak UNIX.

824
00:48:50,140 --> 00:48:53,810
Windows fè pa konsa pou sa anpil, men yon anpil
nan lide yo te pran nan UNIX.

825
00:48:53,810 --> 00:48:59,220
>> Se konsa, li ale jiska etap nan e li di,
tout dwa, mwen te ekri UNIX.

826
00:48:59,220 --> 00:49:03,940
Apre sa, jis pou ou nèg konnen, mwen se
kapab ale nan tout

827
00:49:03,940 --> 00:49:05,590
yon sèl youn nan òdinatè ou.

828
00:49:05,590 --> 00:49:14,280
Depi mwen mete youn nan sa yo espesyal si x
egal egal Ken Thomson se pè,

829
00:49:14,280 --> 00:49:16,350
Lè sa a, mwen pèmèt yo konekte.

830
00:49:16,350 --> 00:49:18,370
Se konsa, moun, yo sanble, byen,
how'd ou fè sa?

831
00:49:18,370 --> 00:49:21,090
Nou te gade pwogram nan login
e pa gen anyen nan la.

832
00:49:21,090 --> 00:49:24,700
Li se tankou, byen, mwen modifye du a
ou kapab konekte nan pwogram nan login

833
00:49:24,700 --> 00:49:30,490
se konsa ke pwogram nan login kounye a ap gen
ki x egal egal Ken Thompson

834
00:49:30,490 --> 00:49:31,700
se pè.

835
00:49:31,700 --> 00:49:33,120
>> Apre sa, yo di, byen, sa a, se pa vre.

836
00:49:33,120 --> 00:49:35,740
Nou ap chèche a du a, ak nan
du pa gen okenn liy nan

837
00:49:35,740 --> 00:49:36,400
Kòd tankou sa.

838
00:49:36,400 --> 00:49:40,540
Li se tankou, OK, men ki sa yo ou
konpile du a ak?

839
00:49:40,540 --> 00:49:44,810
Apre sa, yo panse, e li, tankou, byen,
Mwen se youn nan moun ki te ban nou du a

840
00:49:44,810 --> 00:49:50,580
w ap itilize konpile du a, se konsa
w ap konpile yon du, se sa

841
00:49:50,580 --> 00:49:56,390
tèt li se move, epi yo pral
kraze pwogram nan login.

842
00:49:56,390 --> 00:49:59,360
Se konsa, fondamantalman, nan ki pwen, gen nan
pa gen okenn fason ou ta ka gade nan sous la

843
00:49:59,360 --> 00:50:02,450
Kòd nan pwogram nan login
yo wè sa ki mal.

844
00:50:02,450 --> 00:50:04,220
Ou pa t 'kapab menm gade nan la
sous Kòd la du a

845
00:50:04,220 --> 00:50:06,790
yo wè sa ki mal.

846
00:50:06,790 --> 00:50:11,940
>> Ou ta bezwen gade machin nan
Kòd, binè aktyèl la nan la

847
00:50:11,940 --> 00:50:16,760
konpile du yo wè, rete tann, sa yo
liy nan Kòd pa ta dwe isit la.

848
00:50:16,760 --> 00:50:22,130
Men, Ken Thompson pran l 'yon sèl etap
plis, li di: byen, gen

849
00:50:22,130 --> 00:50:25,980
pwogram espesyal sa yo ki aktyèlman
ede w li binè a nan pwogram yo,

850
00:50:25,980 --> 00:50:29,340
ak Se konsa, si yon moun te itilize ke pwogram nan
li binè a, yo ta wè sa yo

851
00:50:29,340 --> 00:50:30,490
liy nan kòd.

852
00:50:30,490 --> 00:50:34,020
Li te modifye pwogram sa yo vle di, tout
dwat, si w ap chèche a nan

853
00:50:34,020 --> 00:50:38,460
du, pa montre sa a an patikilye
seri binè.

854
00:50:38,460 --> 00:50:42,830
>> Se konsa, Lè sa a, ou bezwen pran ke yon etap
pli lwen ak fondamantalman, ki ta ka gen

855
00:50:42,830 --> 00:50:46,210
pran plizyè nivo indirection,
ak nan kèk pwen, pa gen yon la aktyèlman

856
00:50:46,210 --> 00:50:47,990
yo pral tcheke.

857
00:50:47,990 --> 00:50:52,590
Se konsa, moral la nan istwa a se, w ap
pa yo pral ekri

858
00:50:52,590 --> 00:50:54,340
Sonnen nan klas sa a.

859
00:50:54,340 --> 00:50:57,020
W ap ale nan dwe lè l sèvi avèk k ap grenpe
Sonnen yon anpil nan klas sa a.

860
00:50:57,020 --> 00:51:00,490
Pou tout ou konnen, rezone se yon move
pwogram ki sabote tout

861
00:51:00,490 --> 00:51:03,520
pwogram sèl ou janm konpile.

862
00:51:03,520 --> 00:51:08,206
Apre sa, yo kite ou sou sa trè menasan
note, wè ou nan Mèkredi.

863
00:51:08,206 --> 00:51:10,030
>> [Aplodisman]

864
00:51:10,030 --> 00:51:12,935
>> Oratè 2: Nan CS50 nan pwochen an.

865
00:51:12,935 --> 00:51:14,580
>> Oratè 3: pa ou oze di sa.

866
00:51:14,580 --> 00:51:15,930
Ou ka fè sa.

867
00:51:15,930 --> 00:51:19,440
Ou te fè sa anvan, ou kapab fè sa a
jodi a, ou ka fè sa denmen.

868
00:51:19,440 --> 00:51:20,930
Ou ve yo te fè sa pandan plizyè ane.

869
00:51:20,930 --> 00:51:22,790
Jis ale kanpe ak fè sa.

870
00:51:22,790 --> 00:51:24,310
Ou ka fè sa.

871
00:51:24,310 --> 00:51:26,102
>> [MIZIK jwe]