1
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2
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>> Professur: Allura l-aġenda għal
din il-ġimgħa, ma Jittieħed li ħafna.

3
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Iżda nisperaw ħafna, utli ħafna
u rilevanti għal inti guys din il-ġimgħa.

4
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Iżda aħna qed tmur biex jonfqu forsi 15,
20 minuta biss malajr jitkellem

5
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dwar il-lista link.

6
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Listi Link ser
tkun koperta fuq il-kwizz.

7
00:00:19,694 --> 00:00:22,610
Allura forsi ikun utli ħafna
biex jitgħallmu ftit dwar dak li hu.

8
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>> Aħna ser jqattgħu l-kbira
maġġoranza tat-taqsima tal-lum

9
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għaddej matul problemi prattiċi kwizz żero.

10
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U allura aħna ser tiffranka forsi 20, 30 minuta
fl-aħħar għal xi mistoqsijiet wieqaf

11
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xi ħadd ikollu.

12
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>> U mbagħad, l-aħħar
ħames minuti, jien ser

13
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li tagħti pompa up diskors għall-kwizz.

14
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Inti guys kollha jridu jkun hawn għal dan.

15
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Minħabba li għaddej biex jkun żmien tajjeb.

16
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17
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>> Kull dritt, hekk xi
materjal fuq il-lista link.

18
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Kif dawn qed tipikament strutturat huwa
għandek dak li sejjaħ node, right?

19
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Inti għandek dawn l-affarijiet imsejħa
lymph, li huma structs.

20
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I ser imorru fuq kif toħloq
node fil-slide li jmiss.

21
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Iżda essenzjalment kollha marbuta
listi hija hija data li

22
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ġie midmum flimkien permezz pointers.

23
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>> U għalhekk l-vantaġġ li għandna
ta tintuża lista marbuta fuq,

24
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forsi, bħal firxa, huwa
l-fatt li fil-firxa

25
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għandek bżonn blokka waħda kontigwa ta
memorja kollha fl-istess post, wieħed

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wara l-oħra, biex ikunu jistgħu jkollhom dik.

27
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Billi lista marbuta, inti tista
jkollhom bits ftit każwali ta 'memorja

28
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kollha fuq il-kompjuter tiegħek
midmum flimkien mill pointers.

29
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>> U b'dan il-mod inti
jista aċċess għall-informazzjoni

30
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li jiġi wieħed wara l-
oħra, wara l-oħra

31
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mingħajr il-bżonn biss blokki kbar ta '
memorja fil-kompjuter tiegħek x'imkien.

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U għalhekk dan huwa wieħed mill-kbar
raġunijiet għaliex nużaw lista link.

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>> It-tieni nett, huwa faċli ħafna li dinamikament
resize-lista link għaliex fil-firxa,

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meta inti tiddikjara firxa,
għandek ċertu valur stabbilit.

35
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Ejja ngħidu I riedu joħolqu
firxa ta '10 interi.

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I joħolqu firxa ta '10
interi, u thats it.

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Huwa 10.

38
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I do not know x'għandek tagħmel wara dik.

39
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Jekk jien ridt li jagħmilha 11, ma tistax tagħmel dan.

40
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Jekk irrid biex għamilhom 9, ma tistax tagħmel dan.

41
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>> Billi f'lista link, tista 'żżid u
iħassru u daħħal fejn trid.

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Tista dinamiku resize tiegħek
istruttura hawn, l-istruttura tad-data tiegħek.

43
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U li jagħtina ħafna
aktar flessibilità miżjuda

44
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li aħna ma tipikament
jkollhom ma arrays.

45
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>> Kulħadd konfuż fuq il-bażiċi
istruttura ta 'kif lista rabta hija

46
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jew għaliex irridu nużaw wieħed fuq firxa?

47
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Yeah, aħna ser jmorru fuq fid-dettall
kif fil-fatt toħloq waħda.

48
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Iżda din hija biss tip ta '
l-sens ġenerali dritt issa.

49
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Kessaħ.

50
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U hekk arrays huma midmum flimkien
ta 'dawn l-affarijiet ftit sabiħ

51
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imsejħa lymph.

52
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Kollha node huwa huwa tip ta 'Struct.

53
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Ftakar, Struct hija jekk int riedu
biex joħolqu ċertu tip ta 'varjabbli

54
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fis-C li ma jkunx diġà
jeżistu, inti, bħala programmer,

55
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tista 'attwalment joħolqu dak yourself.

56
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>> U għalhekk dan it-tip ta 'data
istruttura tissejjaħ node,

57
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ikun attwalment ġie maħluq minna, li
ma teżistix fil C waħdu.

58
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U l-mod li inti
toħloq waħda hija li għandek

59
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l-header tal Istituzzjonjijiet typedef,
li jirrakkonta l-kumpilatur jien

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waslet biex joħolqu Istituzzjonjijiet.

61
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>> Aħna isem tmur it "node."

62
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U aħna qed tmur ġewwa
li tiddikjara varjabbli,

63
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li se taħżen valur.

64
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U allura aħna qed wkoll ser
jkunu a pointer imsejħa "li jmiss"

65
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li l-punti għall-ieħor
node fil-lista link.

66
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U allura inti finitura li off
bi ftit tirrepeti node ġdid hekk

67
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l-kumpilatur jaf, OK
dak l-aħħar ta 'Istituzzjonjijiet tiegħi.

68
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>> U hekk b'dan il-mod, aħna qed tip
tal-ħolqien ta array ftit ħelu

69
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tip ta 'ħaġa ma'
valur u bil-pointer.

70
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U inti tista 'rabta lilhom kollha
flimkien ma 'dawk pointers.

71
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Sabiex ikunu jistgħu f'kull tip tkun
midmum flimkien katina.

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>> Kessaħ.

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Inti tista 'tisma li daqsxejn aħjar?

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>> UDJENZA: Yeah.

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>> Professur: Kull dritt.

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Allura l-mod li, inti guys tista 'tara,
lista link tipiku huwa strutturat

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hija għandek ras.

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Inti għandek l-valur ras li ma jkunx
li għandu jiġi osservat minn xi pointer oħra.

80
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Imma li għaddej għall-punt fil-
jew referenza, node ieħor.

81
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Il-punt strateġiku wara se referenza l-
node wara li, u hekk u ibqa 'sejjer hekk

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sakemm inti eventwalment hit
l-aħħar tal-lista link tiegħek.

83
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U inti biss mhux se jkollhom pointer hemmhekk.

84
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>> U għalhekk, taħseb bħal, fuq katina, jew saħansitra
jekk kwalunkwe inti guys magħmula, I do not know,

85
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bħal ma loops Frott
meta inti kienu ftit.

86
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Inti lilhom string flimkien
u jilbsuhom madwar għonq tiegħek.

87
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Think huwa l-istess ħaġa eżatt.

88
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Inti għandek dawn l-affarijiet ftit li inti
tista string flimkien dak il-punt li wieħed

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wara dan, li dik ta 'wara
dan, u hekk u ibqa 'sejjer hekk

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sakemm ikollok katina
ta 'struttura data

91
00:04:17,040 --> 00:04:21,190
li tista 'tuża madankollu li tixtieq.

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>> Allura l-mod li dan nixtiequ
tipikament daħħal jew tħassar

93
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kwalunkwe node minn rabta
lista hija differenti ħafna

94
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skond fejn dak node huwa.

95
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Għalhekk, per eżempju, minħabba
pointers huma dejjem

96
00:04:34,880 --> 00:04:38,645
tipponta lejn valur speċifiku,
meta inti tħassar jew daħħal node,

97
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inti tixtieq li tagħmel ċert li l-pointer
hija kollha li tipponta lejn l-affarijiet dritt.

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>> Mela jekk int riedu potenzjalment daħħal
node ġdid mal-valur ta 'wieħed

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ġewwa link Issortjat
lista, nafu lkoll hawn

100
00:04:48,379 --> 00:04:51,170
mill-istampa li għaddej biex
jmorru fl bejn ras u tnejn, id-dritt?

101
00:04:51,170 --> 00:04:52,620
Għaliex wieħed joqgħod hemm dritt.

102
00:04:52,620 --> 00:04:59,060
Iżda l-mod li bih aħna se nagħmlu dak
huwa billi l-ewwel dereferencing il-pointer

103
00:04:59,060 --> 00:05:02,160
minn ras u jibgħat dak li wieħed.

104
00:05:02,160 --> 00:05:05,040
>> Iżda aħna jidħlu fis ta 'problema hawn.

105
00:05:05,040 --> 00:05:08,280
Jista 'xi ħadd jara x'inhi l-problema
hija jekk konna l-ewwel dereference

106
00:05:08,280 --> 00:05:10,090
il pointer minn ras għal wieħed?

107
00:05:10,090 --> 00:05:14,202
Liema problema tista we run fis jekk nippruvaw
li żżid din il-quddiem ta 'firxa tagħna?

108
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>> UDJENZA: [inaudible]

109
00:05:15,409 --> 00:05:16,200
Professur: Eżattament.

110
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Allura hawnhekk għandna pointer li kienet
ladarba tipponta mill-kap għal tnejn.

111
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Imma jekk inti teħles minn dik
pointer, inti punt hija wieħed,

112
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issa għandna ebda idea
fejn imorru biex isibu tnejn.

113
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Għaliex kif għidt qabel, inti ħadthom ltqajna
blokki ġgant tal-memorja fil-kompjuter tiegħek.

114
00:05:29,850 --> 00:05:31,860
Kollha dawn in-nodi jista
jiġu b'intervall saltwarjament

115
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fi kwalunkwe post fil-kompjuter tiegħek.

116
00:05:33,350 --> 00:05:36,140
U inti ma tafx kif
għanddu konstatazzjoni dan.

117
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>> U għalhekk inti jeħtieġ li jkollhom pointers
tipponta lejn lymph kollha fl-aħħar.

118
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Jew inkella jekk inti aċċidentalment
dereference wieħed

119
00:05:42,420 --> 00:05:44,485
mingħajr ma assenjament
valur-ewwel, int

120
00:05:44,485 --> 00:05:47,410
biss ser jitilfu
kollox wara.

121
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>> Allura dak li aħna qed tmur biex
tagħmel hu, inti l-ewwel

122
00:05:49,720 --> 00:05:53,270
jixtiequ joħolqu pointer fuq
l node inti tixtieq li daħħal.

123
00:05:53,270 --> 00:05:55,270
Punt lill fejn inti
tixtieq li daħħal lill-

124
00:05:55,270 --> 00:05:59,410
u mbagħad wara inti
jista 'punt ras lura għal wieħed.

125
00:05:59,410 --> 00:06:02,800
>> Does li jagħmel sens għal kulħadd hawn?

126
00:06:02,800 --> 00:06:03,346
Great.

127
00:06:03,346 --> 00:06:04,720
Jaħsbu li bħala bħad katina.

128
00:06:04,720 --> 00:06:07,420
Jekk inti żid katina,
huwa tip ta 'intuwittivi

129
00:06:07,420 --> 00:06:10,742
kif youd tmur dwar ddaħħal dan.

130
00:06:10,742 --> 00:06:15,274
>> OK, b'tali mod li huwa fil-fatt ħafna
iqsar milli ħsibt li jkun,

131
00:06:15,274 --> 00:06:16,690
a spiel ħames minuti fuq il-listi rabta.

132
00:06:16,690 --> 00:06:19,960
Just hekk inti guys jkollhom l-
idea bażika ta 'dak li hu.

133
00:06:19,960 --> 00:06:23,580
>> Hawnhekk għandna l-aġenda għall-kwizz żero.

134
00:06:23,580 --> 00:06:24,895
Tħallix dan jintimidaw inti.

135
00:06:24,895 --> 00:06:26,270
Naf huwa ħafna ta 'informazzjoni.

136
00:06:26,270 --> 00:06:27,580
Huwa jistenna ħafna scary.

137
00:06:27,580 --> 00:06:33,130
Huwa wkoll ħafna ta ', I
think, CSC tip ta 'termini.

138
00:06:33,130 --> 00:06:37,440
Affarijiet simili kordi hexadeċimali,
pointers, allokazzjonijiet memorja dinamika

139
00:06:37,440 --> 00:06:40,120
huma termini rokits ħafna scary.

140
00:06:40,120 --> 00:06:42,700
>> Iżda aħna qed tmur biex taqsamhom
isfel, jagħmlu xi problemi prattika

141
00:06:42,700 --> 00:06:44,980
sabiex inti guys kollha
huma lesti għal dan it-test.

142
00:06:44,980 --> 00:06:47,104
Kemm inti guys jkollhom
diġà bdejt nistudja?

143
00:06:47,104 --> 00:06:50,040

144
00:06:50,040 --> 00:06:53,670
>> OK, inti guys probabilment jridu
biex tibda jkollna beda

145
00:06:53,670 --> 00:06:56,480
fuq li, minħabba l-kwizz huwa għada.

146
00:06:56,480 --> 00:06:58,739
Jew il-Ħamis għal xi wħud minnkom.

147
00:06:58,739 --> 00:07:01,030
Yeah, hekk aħna qed tmur biex tmur
fuq xi problemi prattiċi.

148
00:07:01,030 --> 00:07:04,600
Jekk inti guys kollha jridu jieħdu
barra folja tal-karta, lapes.

149
00:07:04,600 --> 00:07:07,310
Aħna ser biss jonfqu l-
maġġoranza vasta tat-taqsima tal-lum

150
00:07:07,310 --> 00:07:11,590
għaddej matul parti minn dan hekk inti guys
idea ta 'dak li jistennew fuq il-kwizz.

151
00:07:11,590 --> 00:07:14,957

152
00:07:14,957 --> 00:07:16,890
>> KOLLOX SEW.

153
00:07:16,890 --> 00:07:19,730
Koppja ta 'loġistika
dettalji kif ukoll, għal xi ħadd

154
00:07:19,730 --> 00:07:25,120
li ma kienx biex din ir-rabta hemmhekk, jekk
inti tmur cs50.yale.edu, fuq il-front

155
00:07:25,120 --> 00:07:28,566
din il-paġna hemm rabta
li tgħid "About Quiz Zero."

156
00:07:28,566 --> 00:07:29,440
Link tieħdok hemm.

157
00:07:29,440 --> 00:07:31,065
Jekk int ma taqra dan, jekk jogħġbok aqra dan.

158
00:07:31,065 --> 00:07:34,470
Minħabba li jgħidlek verament importanti
informazzjoni dwar l-kwizz.

159
00:07:34,470 --> 00:07:37,410
>> Jien ser tiġbed dan out mill
li sempliċiment għaliex, fiżikament,

160
00:07:37,410 --> 00:07:40,200
jekk inti guys ma tafx fejn
li jmorru, se jkollna problemi.

161
00:07:40,200 --> 00:07:44,220
U hekk jekk aħħar tiegħek f'termini ma '
sa N, mur l-awditorju iskola liġi.

162
00:07:44,220 --> 00:07:47,500
U jekk aħħar jibda tiegħek ma P
sa Z, mur Davies Awditorju.

163
00:07:47,500 --> 00:07:50,240
U dan japplika biss għall
nies fit-taqsima l-Erbgħa.

164
00:07:50,240 --> 00:07:53,420
>> Jekk inti qed tieħu l-kwizz fuq
Il-Ħamis, inti mur SSS 114

165
00:07:53,420 --> 00:07:55,078
fejn lecture tiegħek tipikament huwa.

166
00:07:55,078 --> 00:07:55,953
UDJENZA: [inaudible]

167
00:07:55,953 --> 00:07:59,316

168
00:07:59,316 --> 00:08:01,940
Professur: O sa Z, int ser
biex tmur fil-sala Davies.

169
00:08:01,940 --> 00:08:03,273
Jien se jibdlu dan, id-dritt?

170
00:08:03,273 --> 00:08:05,670

171
00:08:05,670 --> 00:08:09,698
>> Oh, yeah, inti biss tonqos awtomatikament.

172
00:08:09,698 --> 00:08:11,753
>> Oh yeah, dan huwa inti Christa.

173
00:08:11,753 --> 00:08:15,190

174
00:08:15,190 --> 00:08:16,030
Yeah, bad tiegħi.

175
00:08:16,030 --> 00:08:17,610
Yep, O sa Z, int ser
biex tmur Davies Auditorim.

176
00:08:17,610 --> 00:08:19,140
Jien ser jiffissaw dan darba I upload.

177
00:08:19,140 --> 00:08:20,320
Yeah.

178
00:08:20,320 --> 00:08:22,160
>> U allura wkoll xi ħaġa
importanti f'moħħna

179
00:08:22,160 --> 00:08:25,290
hija li l-Erbgħa, jekk inti uffiċjalment
rreġistrati fit-taqsima l-Erbgħa,

180
00:08:25,290 --> 00:08:26,832
inti trid tieħu kwizz tiegħek nhar l-Erbgħa.

181
00:08:26,832 --> 00:08:29,706
U jekk int rreġistrati fl Ħamis
inti trid tieħu kwizz tiegħek Ħamis.

182
00:08:29,706 --> 00:08:31,000
U huwa matul il-ħin klassi.

183
00:08:31,000 --> 00:08:35,970
Fejn, naħseb li huwa simili 01:00 sa
02:15 nhar ta 'Erbgħa u 2:30-03:45

184
00:08:35,970 --> 00:08:37,220
nhar ta 'Ħamis.

185
00:08:37,220 --> 00:08:41,710
>> Jekk għandek kunflitti irrikonċiljabbli,
Skużi Dekan huma l-unika ħaġa,

186
00:08:41,710 --> 00:08:43,030
sfortunatament, nistgħu nieħdu.

187
00:08:43,030 --> 00:08:45,560
Għaliex aħna kellhom
maġġoranza kbira tat-talbiet

188
00:08:45,560 --> 00:08:47,970
biex jaqilbu minn l-Erbgħa sal-Ħamis.

189
00:08:47,970 --> 00:08:51,265
Li ma nistgħux unur sakemm
għandna talba ta 'Dekan.

190
00:08:51,265 --> 00:08:52,650
>> KOLLOX SEW.

191
00:08:52,650 --> 00:08:57,000
Allura qabel we tibda fuq
Koppja mill-problemi prattika,

192
00:08:57,000 --> 00:09:00,540
Jien biss se jmorru fuq
Tips utli Andy għas-suċċess.

193
00:09:00,540 --> 00:09:04,140
You guys, meta inti tistudja, inti tassew
tixtieq li prattika kitba kodiċi bl-idejn.

194
00:09:04,140 --> 00:09:07,050
L-ewwel darba I qatt
ħa kwizz CS, I ma kinux

195
00:09:07,050 --> 00:09:09,960
prattika kitba kodiċi bl-idejn
qabel u kien estremament

196
00:09:09,960 --> 00:09:11,890
xokkanti fil kemm kien diffiċli.

197
00:09:11,890 --> 00:09:16,125
>> Meta inti guys ma tikseb fis-
vizzju ta 'ittajpjar kollox,

198
00:09:16,125 --> 00:09:20,260
niġu ħafna naturali li jkunu
jistgħu jkunu autocompleted

199
00:09:20,260 --> 00:09:22,015
parentesi u semicolons hemmhekk.

200
00:09:22,015 --> 00:09:23,890
Meta inti tikteb dan jitwettaq
bl-idejn, xi kultant huwa

201
00:09:23,890 --> 00:09:27,100
ħafna, faċli ħafna li tinsa b'semicolon,
jew tinsa li tagħlaq parentesi,

202
00:09:27,100 --> 00:09:30,970
jew tinsa li tagħlaq kolon,
jew xi ħaġa bħal dik.

203
00:09:30,970 --> 00:09:34,322
>> Allura meta inti tikteb kodiċi bl-idejn,
huwa jħossu differenti ħafna.

204
00:09:34,322 --> 00:09:37,280
Allura inti guys, meta inti qed jaħdmu
permezz xi wħud mill-problemi prattika,

205
00:09:37,280 --> 00:09:38,904
ikun tajjeb li verament prattika llum.

206
00:09:38,904 --> 00:09:41,770
Jew għada, I suppose, jekk int
tieħu l-kwizz nhar il-Ħamis.

207
00:09:41,770 --> 00:09:45,280
>> It-tieni, aħna għandna l-aħħar, bħal,
jiswew tmien snin ta 'prattika

208
00:09:45,280 --> 00:09:47,070
kwizzijiet online.

209
00:09:47,070 --> 00:09:50,759
Kwizz din is-sena probabbilment se jkunu
ħafna, simili ħafna għal kull wieħed minnhom.

210
00:09:50,759 --> 00:09:51,800
Huma qed kollha simili ħafna.

211
00:09:51,800 --> 00:09:54,220
Inti tip ta 'tikseb fis-
istil tat-tip ta 'mistoqsijiet

212
00:09:54,220 --> 00:09:57,250
li aħna nistaqsu, it-tip ta '
funzjonijiet li aħna ser jiktbu fil,

213
00:09:57,250 --> 00:09:58,580
eċċetera, eċċetera.

214
00:09:58,580 --> 00:10:01,980
>> Sabiex jieħdu l kwizzijiet prattika,
speċjalment fi żmien ristrett.

215
00:10:01,980 --> 00:10:05,390
75 minuta biex tagħmel l-kwizz huwa
mhux ħafna ammont ta 'ħin.

216
00:10:05,390 --> 00:10:07,254
Huwa ħafna, twil ħafna.

217
00:10:07,254 --> 00:10:09,670
U għalhekk inti guys verament jixtiequ
biex tiżgura li inti guys huma

218
00:10:09,670 --> 00:10:11,990
fil-drawwa tal-kitba
kodiċi bl-idejn malajr.

219
00:10:11,990 --> 00:10:15,070
Għaliex inti ma tridx l-ewwel
ħin biex tara kwizz ta 'dak it-tul

220
00:10:15,070 --> 00:10:16,560
tkun fuq kwizz tiegħek.

221
00:10:16,560 --> 00:10:20,540
You guys verament tixtieq li tagħmel ċert
li inti prattika qabel.

222
00:10:20,540 --> 00:10:24,550
>> Ir-Raba ', inti tixtieq li tirrevedi l-
lecture u taqsima slides.

223
00:10:24,550 --> 00:10:25,980
Inti ma għandekx memorize affarijiet.

224
00:10:25,980 --> 00:10:30,430
Attwalment, kulħadd huwa permess
folja waħda ta 'noti karta bajda,

225
00:10:30,430 --> 00:10:31,090
quddiem u lura.

226
00:10:31,090 --> 00:10:32,920
You guys tista tip jew jiktbu.

227
00:10:32,920 --> 00:10:37,070
Jekk issib ruħek li jeħtieġu li jimmemorizza
xejn, tpoġġi l-isfel fuq dak sheet.

228
00:10:37,070 --> 00:10:40,810
>> I garanzija li inti, inti ma tridx li
ikunu mwaħħla fin-nofs ta 'dak kwizz

229
00:10:40,810 --> 00:10:43,890
qed simili, oh yeah, x'inhu l-
runtime ta 'dan it-tip versus dik it-tip.

230
00:10:43,890 --> 00:10:46,490
Just poġġih isfel u jibagħtu kopja tagħha
dritta mill folja nota tiegħek.

231
00:10:46,490 --> 00:10:50,420
Imbagħad inti tista 'attwalment biss tuża tiegħek
moħħ biex jaħsbu dwar il-problemi

232
00:10:50,420 --> 00:10:52,190
aktar milli jkollhom recall fatti.

233
00:10:52,190 --> 00:10:55,250
U hekk vera jittieħed vantaġġ
ta 'kwalunkwe dettalji niċċa

234
00:10:55,250 --> 00:11:00,140
li taħseb li għandek bżonn li jimmemorizza,
plop isfel fuq il-folja ta 'reviżjoni.

235
00:11:00,140 --> 00:11:02,680
>> OK, xi mistoqsijiet loġistikament
dwar l-kwizz

236
00:11:02,680 --> 00:11:05,510
qabel nibdew xi
problemi kwizz prattika?

237
00:11:05,510 --> 00:11:06,416
Yeah?

238
00:11:06,416 --> 00:11:10,040
>> UDJENZA: I ma kellhomx iċ-ċans
li tħares lejn l-kwizz [inaudible]

239
00:11:10,040 --> 00:11:11,757
iżda huwa se jkun
applikazzjoni aktar,

240
00:11:11,757 --> 00:11:14,090
Jew hemm ukoll se tkun,
simili, mistoqsijiet għarfien?

241
00:11:14,090 --> 00:11:14,940
>> Professur: Huwa ħafna.

242
00:11:14,940 --> 00:11:16,731
Għalhekk, il-mod li I
kieku deskritti l-kwizz

243
00:11:16,731 --> 00:11:18,810
is-- I jitpoġġew flimkien
xi problemi prattika

244
00:11:18,810 --> 00:11:20,960
I jinġibed minn kull-kwiżż.

245
00:11:20,960 --> 00:11:25,210
Imma inti taf tara li hemm żewġ prinċipali
tipi ta 'mistoqsijiet aħna ser jgħidlek.

246
00:11:25,210 --> 00:11:28,750
>> Wieħed huwa dettall livell baxx ħafna ta 'għalf.

247
00:11:28,750 --> 00:11:31,720
Aħna ser jagħtuk blokki żgħar ta 'kodiċi
u jgħidu, hemm żball hawn?

248
00:11:31,720 --> 00:11:33,110
Dak li jkun istampar hawn?

249
00:11:33,110 --> 00:11:35,980
X'se dan il-kodiċi tipproduċi, eċċetera.

250
00:11:35,980 --> 00:11:38,710
Allura dettalji ta 'informazzjoni f'livell baxx ħafna.

251
00:11:38,710 --> 00:11:42,700
>> U fuq in-naħa flip, aħna ser ikollhom ħafna
mistoqsijiet bbażati fuq l-għarfien ta 'livell għoli.

252
00:11:42,700 --> 00:11:45,190
Tista 'tispjega dak l-
differenza bejn tfittxija binarja

253
00:11:45,190 --> 00:11:46,148
u tfittxija lineari hu?

254
00:11:46,148 --> 00:11:48,500
Għaliex kieku rridu
użu wieħed fuq l-ieħor?

255
00:11:48,500 --> 00:11:49,960
Forsi, dak li huwa GDB?

256
00:11:49,960 --> 00:11:51,560
Għaliex irridu li jużaw GDB?

257
00:11:51,560 --> 00:11:54,590
Livell ogħla, aktar fundamentali
fehim mistoqsijiet.

258
00:11:54,590 --> 00:11:58,240
Sabiex tkun taf tara taħlita ta '
l-tnejn minnhom fuq kwizz tiegħek.

259
00:11:58,240 --> 00:12:01,462
>> Xi ħaġa oħra qabel we
ras straight fis dan?

260
00:12:01,462 --> 00:12:02,879
KOLLOX SEW.

261
00:12:02,879 --> 00:12:03,670
UDJENZA: Wieħed aktar.

262
00:12:03,670 --> 00:12:04,030
Professur: Oh, wieħed aktar.

263
00:12:04,030 --> 00:12:04,340
Jiddispjacini.

264
00:12:04,340 --> 00:12:05,631
>> UDJENZA: Yeah, dan kollu dritt.

265
00:12:05,631 --> 00:12:10,140
Allura inti qed tgħid 75 minuta huwa
qasir wisq, simili huwa improbabbli

266
00:12:10,140 --> 00:12:11,640
li aħna se jispiċċaw?

267
00:12:11,640 --> 00:12:13,571
Jew, bħal, fil-75 minuta
huwa eżattament daqshekk ħin

268
00:12:13,571 --> 00:12:15,700
kif ikollna kieku konna
ppreparat b'mod xieraq?

269
00:12:15,700 --> 00:12:17,450
Professur: OK, so il
kwizz huwa sfida.

270
00:12:17,450 --> 00:12:19,550
Huwa ċertament sfida.

271
00:12:19,550 --> 00:12:21,092
Inti ser issib ruħek fuq żmien qasir.

272
00:12:21,092 --> 00:12:24,341
Inti probabbilment ser jintlaqtu, bħall 10,
15 minuta biex imorru, u li jkunu simili, shit.

273
00:12:24,341 --> 00:12:25,520
Għandi tant baqa 'tagħmel.

274
00:12:25,520 --> 00:12:26,520
U li totalment multa.

275
00:12:26,520 --> 00:12:28,740
Kulħadd se jħossu l-istess mod.

276
00:12:28,740 --> 00:12:31,074
>> Just ikunu konxji ħafna ta '
kemm żmien għandek.

277
00:12:31,074 --> 00:12:33,490
U hekk hu għalhekk I jgħidlek
guys jagħmlu l-kwiżż prattika.

278
00:12:33,490 --> 00:12:36,672
Minħabba li verament jagħti sens kbir
ta 'dak l-kwizz se tkun simili.

279
00:12:36,672 --> 00:12:39,130
Mela jekk issib ruħek qed
jistgħu lest il-prattika

280
00:12:39,130 --> 00:12:41,671
kwizzijiet fi ammont tajjeb ta '
ħin, inti tista 'pass lilek innifsek sew,

281
00:12:41,671 --> 00:12:45,695
allura inti mhux se jkollhom problema
l-Erbgħa u l-Ħamis.

282
00:12:45,695 --> 00:12:46,575
>> Kessaħ.

283
00:12:46,575 --> 00:12:49,200
Mela jekk kulħadd wants-- naħseb
ħafna nies ikollhom folji tal-karta

284
00:12:49,200 --> 00:12:49,810
out diġà.

285
00:12:49,810 --> 00:12:52,604
Jien ser essenzjalment biss
jagħtuk mistoqsijiet kampjun,

286
00:12:52,604 --> 00:12:54,520
jagħtuk guys, bħal, a
ftit minuti biex jagħmlu lilhom.

287
00:12:54,520 --> 00:12:59,610
U aħna ser jmorru fuq bħala klassi
dak l-tweġibiet għalihom huma.

288
00:12:59,610 --> 00:13:02,860
>> Allura dan huwa tipiku ħafna
kwistjoni kmieni aħna ser

289
00:13:02,860 --> 00:13:06,720
nitolbuk, just konverżjoni
numri bejn bażijiet differenti.

290
00:13:06,720 --> 00:13:09,070
Binarju, kif inti guys tista
recall, hija bażi tnejn.

291
00:13:09,070 --> 00:13:12,470
Deċimali hija bażi 10, jew dak li aħna
bħala bnedmin tipikament tinterpreta.

292
00:13:12,470 --> 00:13:17,120
Hexadeċimali huwa bażi 16, li huwa żero
permezz ta 'disa kif ukoll A permezz F.

293
00:13:17,120 --> 00:13:19,990
>> Allura hemm erba 'numri jien
inti titlob guys li jikkonvertu hawn.

294
00:13:19,990 --> 00:13:23,909
I ser jagħtuk tixtieq, tlieta sa
erba 'minuti biex jaħsbu permezz ta' kif

295
00:13:23,909 --> 00:13:25,200
aħna tmur dwar isolvi din.

296
00:13:25,200 --> 00:13:32,832

297
00:13:32,832 --> 00:13:35,710
>> UDJENZA: Are we permess kalkolaturi?

298
00:13:35,710 --> 00:13:37,630
>> Professur: Inti mhux se
bżonn kalkolaturi, yeah.

299
00:13:37,630 --> 00:13:42,420
Naħseb minn hekk bażiku, I think, huwa
kollha inti guys se jkunu mitluba li jagħmlu.

300
00:13:42,420 --> 00:14:41,700

301
00:14:41,700 --> 00:14:45,070
>> U biss so I tip ta jkollhom sens
tal meta kulħadd isir, tfittex up,

302
00:14:45,070 --> 00:14:47,429
mewġa, I do not know, daħka,
ħarsa kuntenti jekk inti qed isir.

303
00:14:47,429 --> 00:14:47,929
Yeah.

304
00:14:47,929 --> 00:17:21,680

305
00:17:21,680 --> 00:17:23,945
Forsi ftit aktar minuti.

306
00:17:23,945 --> 00:18:28,080

307
00:18:28,080 --> 00:18:29,600
>> OK, ejja iġġibu.

308
00:18:29,600 --> 00:18:31,580
Jien apposta ser
jagħtik guys inqas ħin

309
00:18:31,580 --> 00:18:33,760
milli inti probabilment ikollok bżonn li
jagħmlu xi wħud minn dawn il-problemi,

310
00:18:33,760 --> 00:18:37,124
sempliċement għaliex nixtieq li jagħmlu ċert li
irridu jiksbu permezz mazz ta 'problemi.

311
00:18:37,124 --> 00:18:39,290
Sabiex l-ebda inkwiet jekk inti ma
jkollhom ċans biex jintemm.

312
00:18:39,290 --> 00:18:43,770
Totalment OK sakemm ikollok
idea ta 'kif imorru dwar dan.

313
00:18:43,770 --> 00:18:45,850
Mela ejja imorru quddiem u jagħmlu l-ewwel waħda.

314
00:18:45,850 --> 00:18:52,690

315
00:18:52,690 --> 00:18:57,870
>> Allura l-ewwel, ħadd ma jridu tell me
fil binarju, liema do kull waħda minn dawn ċifri

316
00:18:57,870 --> 00:19:00,484
jirrappreżentaw f'termini ta 'valuri tagħhom?

317
00:19:00,484 --> 00:19:01,250
Yeah?

318
00:19:01,250 --> 00:19:03,349
>> UDJENZA: Tnejn sa l-
enerġija żero, 2-1.

319
00:19:03,349 --> 00:19:04,140
Professur: Eżattament.

320
00:19:04,140 --> 00:19:04,640
So.

321
00:19:04,640 --> 00:19:13,430

322
00:19:13,430 --> 00:19:16,430
>> Dritt, hekk tipikament
meta nkunu fil-bażi 10

323
00:19:16,430 --> 00:19:20,580
dawn kollha jirrappreżentaw huma, bħal,
10 għall-bażi ta 'żero, id-dritt?

324
00:19:20,580 --> 00:19:21,810
C'est post tiegħek.

325
00:19:21,810 --> 00:19:24,520
Kollha post 10 ta tiegħek hija hija
10 għall-qawwa ta 'wieħed.

326
00:19:24,520 --> 00:19:26,600
Post inti 100 huwa 10
għall-qawwa ta 'tnejn.

327
00:19:26,600 --> 00:19:29,570
>> Tkun xi bażi int fil va
x'jaqsmu ma 'l-istess ħaġa eżatt,

328
00:19:29,570 --> 00:19:31,480
biss b'bażi ​​differenti.

329
00:19:31,480 --> 00:19:34,130
Allura binarju, dak kollu li hu huwa bażi tnejn.

330
00:19:34,130 --> 00:19:37,110
Inti qed tmur biex jikkonvertu l-
ċifri f'żewġ għal dak kollu enerġija

331
00:19:37,110 --> 00:19:38,190
ta 'dak ċifri.

332
00:19:38,190 --> 00:19:41,450
U hekk f'dan is-sens, aħna
jista 'jkollhom mod faċli

333
00:19:41,450 --> 00:19:43,800
li jkunu kapaċi li jżidu jew
Fil-qosor l-numri sabiex

334
00:19:43,800 --> 00:19:46,010
li jikkonvertu bażi ta '10.

335
00:19:46,010 --> 00:19:50,362
>> Allura ħadd ma jridu tell me dak li l-
risposta għall-ewwel waħda hija fil-bażi għaxar?

336
00:19:50,362 --> 00:19:51,674
>> UDJENZA: Żewġ, [inaudible]

337
00:19:51,674 --> 00:19:52,340
Professur: Yeah.

338
00:19:52,340 --> 00:19:53,230
UDJENZA: 42.

339
00:19:53,230 --> 00:19:56,560
Professur: 42, hemm inti tmur.

340
00:19:56,560 --> 00:20:00,660
Allura l-mod kif aħna ltqajna din it-tweġiba kienet minn
tagħmel tnejn l-ewwel, li huwa tnejn.

341
00:20:00,660 --> 00:20:02,760
Plus tnejn t-tielet, li huwa tmienja.

342
00:20:02,760 --> 00:20:07,590
Plus tnejn għall-ħames, li
huwa dak kollu li huwa fadal.

343
00:20:07,590 --> 00:20:09,390
Inti qosor lilhom up u huwa 42.

344
00:20:09,390 --> 00:20:12,000
>> Hija ħadd konfuż dwar kif sirna li?

345
00:20:12,000 --> 00:20:15,630
Barra minn hekk Allura bażiku, bħal
I said, inti għandek tkun OK.

346
00:20:15,630 --> 00:20:17,410
Jekk le, ukoll, nistgħu prattika li wisq.

347
00:20:17,410 --> 00:20:18,720
Imma li kollox id-dritt.

348
00:20:18,720 --> 00:20:20,560
Kessaħ.

349
00:20:20,560 --> 00:20:25,570
>> Hawn xi ħadd li tixtieq li tagħti me l-
risposta għat-tieni waħda kif ukoll?

350
00:20:25,570 --> 00:20:26,860
>> 50?

351
00:20:26,860 --> 00:20:27,600
Tajba.

352
00:20:27,600 --> 00:20:30,044
Kulħadd konfuż dwar kif
sirna li jew?

353
00:20:30,044 --> 00:20:31,960
Kessaħ, I ser ikollhom l-
tweġibiet dwar il-pjastra jmiss.

354
00:20:31,960 --> 00:20:34,440
Sabiex l-ebda inkwiet jekk inti
bżonn li kopja l-isfel.

355
00:20:34,440 --> 00:20:38,860
>> OK, so hexadeċimali huwa daqsxejn delikati.

356
00:20:38,860 --> 00:20:41,840
imma jien ser nuruk guys
shortcut għall kif jagħmlu dan.

357
00:20:41,840 --> 00:20:44,800
Allura hexadeċimali, kif inti
ftakar, kollox huwa jkun 16.

358
00:20:44,800 --> 00:20:48,920
U għaliex aħna bħala bnedmin ma attwalment
jkollhom 16-numri li jirrappreżentaw li,

359
00:20:48,920 --> 00:20:56,940
immorru minn żero għal disgħa, li l-ewwel tagħna
10 valuri, u mbagħad nagħmlu A permezz F,

360
00:20:56,940 --> 00:20:58,630
li huma s-sitt valuri li ġejjin.

361
00:20:58,630 --> 00:21:03,040
>> U għalhekk l-eħfef mod biex imorru minn
kwalunkwe numru binarju għal hexadeċimali

362
00:21:03,040 --> 00:21:05,350
huwa li taqsamhom up fis nofsijiet.

363
00:21:05,350 --> 00:21:10,042
U sabiex kwalunkwe numru binarju aħna ser jagħtuk
inti probabilment se jkollhom tmien ċifri.

364
00:21:10,042 --> 00:21:11,750
Tista 'biss break
minnhom fin-nofs.

365
00:21:11,750 --> 00:21:17,460
>> Allura l-ewwel one-- waħda waħda,
wieħed wieħed, wieħed, wieħed, wieħed wieħed.

366
00:21:17,460 --> 00:21:21,340
Tip ta 'think it up, inti taf, tfassal
slash jew comma bejniethom.

367
00:21:21,340 --> 00:21:23,800
U inti tista 'sempliċement jikkonvertu
direttament x'ikun

368
00:21:23,800 --> 00:21:26,670
dan huwa li l-ewwel
numru ta 'hexadeċimali,

369
00:21:26,670 --> 00:21:29,880
u tkun xi tkun hawnhekk huwa li
it-tieni ta 'hexadeċimali.

370
00:21:29,880 --> 00:21:37,584
>> Mela ftakar minn notazzjoni komuni,
liema do valuri hexadeċimali tibda bil?

371
00:21:37,584 --> 00:21:38,460
>> UDJENZA: Zero.

372
00:21:38,460 --> 00:21:39,270
>> Professur: 0X.

373
00:21:39,270 --> 00:21:45,210
Allura aħna nafu li kull darba aħna nitolbuk
li jikkonvertu kwalunkwe numru lil hexadeċimali,

374
00:21:45,210 --> 00:21:48,230
jew kwalunkwe ħin li inti tara xi
numru li jibda bil 0X,

375
00:21:48,230 --> 00:21:50,230
inti taf li huwa valur hexadecimal.

376
00:21:50,230 --> 00:21:54,160
>> U allura int ser tkun mitluba li
jiddeterminaw liema dawn iż-żewġ ċifri huma.

377
00:21:54,160 --> 00:21:59,690
U l-mod inti tagħmel dan, tikkettjar up
li nofs u tikkettjar up li nofs.

378
00:21:59,690 --> 00:22:02,870
Allura f'dan l-eżempju, dak
kieku wieħed, wieħed, wieħed, wieħed ikun?

379
00:22:02,870 --> 00:22:04,890
Liema valur li kieku jkun?

380
00:22:04,890 --> 00:22:06,040
Li d tkun F, right?

381
00:22:06,040 --> 00:22:08,050
Li d jkun 15.

382
00:22:08,050 --> 00:22:11,780
>> Għalhekk dan ikun F. One,
waħda, wieħed, wieħed hawn huwa wkoll

383
00:22:11,780 --> 00:22:21,270
F. Allura wieħed, wieħed, wieħed, wieħed, wieħed, wieħed, wieħed,
wieħed f'hexadecimal, kollox huwa huwa 0XFF.

384
00:22:21,270 --> 00:22:25,350
Minħabba Din it-taqsima rappreżentati
F, il-valur ta '15,

385
00:22:25,350 --> 00:22:27,331
u Din it-taqsima rappreżentati
F, il-valur 15.

386
00:22:27,331 --> 00:22:29,456
Minħabba ftakar, aħna qed
għadd minn żero sa disgħa.

387
00:22:29,456 --> 00:22:35,290
A huwa simili 10, B huwa simili 11, F hija l-15.

388
00:22:35,290 --> 00:22:41,690
>> Does li jagħmel sens għal kulħadd kif
sirna minn binarja li hexadeċimali?

389
00:22:41,690 --> 00:22:44,595
>> UDJENZA: U hekk kif ma nikbru
15 minn dik, wieħed, wieħed, wieħed?

390
00:22:44,595 --> 00:22:46,220
Professur: Yeah, dan huwa binarju, id-dritt?

391
00:22:46,220 --> 00:22:48,090
Immaġina din hija biss numru binarju.

392
00:22:48,090 --> 00:22:50,792
Allura għandek żewġ għad-
0, li huwa wieħed.

393
00:22:50,792 --> 00:22:51,500
UDJENZA: Oh, OK.

394
00:22:51,500 --> 00:22:51,670
Allura inti biss totali out.

395
00:22:51,670 --> 00:22:52,670
>> Professur: Yeah, u mbagħad
inti biss totali li l-.

396
00:22:52,670 --> 00:22:53,380
Li kollox huwa.

397
00:22:53,380 --> 00:22:54,890
>> UDJENZA: OK.

398
00:22:54,890 --> 00:22:55,830
>> Professur: OK.

399
00:22:55,830 --> 00:23:00,740
>> UDJENZA: Allura inti tmur minn binarja
li deċimali biex hexadeċimali?

400
00:23:00,740 --> 00:23:04,590
>> Professur: Dik hija l-
eħfef mod biex isir hekk, yeah.

401
00:23:04,590 --> 00:23:11,390
Int mhux ser deċimali minħabba
deċimali biss għandha żero għal disa.

402
00:23:11,390 --> 00:23:13,410
Aħna biss tip ta '
qsim dan up fil tnejn.

403
00:23:13,410 --> 00:23:15,201
>> UDJENZA: [inaudible]
użu deċimali biex isibu

404
00:23:15,201 --> 00:23:17,809
dak li logħbiet sa f'hexadecimal.

405
00:23:17,809 --> 00:23:20,100
Professur: I mean, int
tikkettjar bl-użu matematika bażika.

406
00:23:20,100 --> 00:23:20,725
UDJENZA: Yeah.

407
00:23:20,725 --> 00:23:22,300
Professur: Yeah, pretty ħafna.

408
00:23:22,300 --> 00:23:23,630
Huwa daqsxejn konfużjoni.

409
00:23:23,630 --> 00:23:26,410
Iżda biss taf li inti
tista 'taqsam up x'ikun

410
00:23:26,410 --> 00:23:28,160
dan il-valur huwa fis biss nofsijiet.

411
00:23:28,160 --> 00:23:29,570
Ħares, dak li huwa dan fil binarju?

412
00:23:29,570 --> 00:23:30,610
Liema numru huwa li?

413
00:23:30,610 --> 00:23:33,270
Li għaddej biex tkun
xi ħaġa minn żero sa F.

414
00:23:33,270 --> 00:23:35,722
>> Hawnhekk huwa wkoll se tkun
xi ħaġa minn żero sa F.

415
00:23:35,722 --> 00:23:37,722
U allura inti tista 'biss jitqiegħed
dawn iż-żewġ hemm dritt.

416
00:23:37,722 --> 00:23:38,263
>> UDJENZA: OK.

417
00:23:38,263 --> 00:23:38,910
Professur: Yep.

418
00:23:38,910 --> 00:23:39,410
KOLLOX SEW.

419
00:23:39,410 --> 00:23:42,320
Allura inti guys tixtieq li
jippruvaw dak li jmiss allura?

420
00:23:42,320 --> 00:23:49,601
Żero, wieħed, żero wieħed,
wieħed, żero, wieħed zero.

421
00:23:49,601 --> 00:23:52,350
I ser jagħtuk guys simili 30 sekonda,
peress li inti probabilment ma kinux jafu

422
00:23:52,350 --> 00:23:53,850
l-trick li kif għandek tagħmel dan qabel.

423
00:23:53,850 --> 00:24:24,950

424
00:24:24,950 --> 00:24:27,381
>> OK, kull min jixtiequ li tikseb xi sparatura dan wieħed?

425
00:24:27,381 --> 00:24:28,774
>> 0X5A.

426
00:24:28,774 --> 00:24:29,440
Professur: 0X5A.

427
00:24:29,440 --> 00:24:30,470
5a.

428
00:24:30,470 --> 00:24:31,340
Tajba.

429
00:24:31,340 --> 00:24:37,050
Allura dan hawnhekk be-- inti tixtieq
biex tgħidilna kif inti ltqajna dan?

430
00:24:37,050 --> 00:24:38,920
L-ewwel, kif ma ikollok l ħamsa?

431
00:24:38,920 --> 00:24:42,030
>> UDJENZA: Minħabba żero,
wieħed, żero, wieħed huwa ħamsa.

432
00:24:42,030 --> 00:24:45,170
>> Professur: Does kulħadd jifhem
għaliex żero, wieħed, żero, wieħed huwa ħamsa?

433
00:24:45,170 --> 00:24:46,260
You ħadthom ltqajna wieħed hawn.

434
00:24:46,260 --> 00:24:48,010
Inti għandek xejn f'żewġ għall-ewwel.

435
00:24:48,010 --> 00:24:50,300
F'żewġ għat-tieni, inti
jkollhom waħda, li hija erba '.

436
00:24:50,300 --> 00:24:52,600
Allura inti żid l-erba plus
l-waħda, inti għandek ħamsa.

437
00:24:52,600 --> 00:24:53,600
Kulħadd tajba?

438
00:24:53,600 --> 00:24:54,100
KOLLOX SEW.

439
00:24:54,100 --> 00:24:56,570
U allura dak li din tkun u għaliex?

440
00:24:56,570 --> 00:24:58,350
Liema numru ma A jikkorrispondi għall?

441
00:24:58,350 --> 00:24:59,350
>> UDJENZA: 10.

442
00:24:59,350 --> 00:25:00,976
>> Professur: U dak li dan fil-bażi tnejn?

443
00:25:00,976 --> 00:25:01,850
UDJENZA: [inaudible]

444
00:25:01,850 --> 00:25:03,010
Professur: Eżattament.

445
00:25:03,010 --> 00:25:06,370
Allura dan it-tieni valur hawnhekk ikunu 0X5A.

446
00:25:06,370 --> 00:25:08,410
>> Kulħadd tajba dwar kif jikkonvertu?

447
00:25:08,410 --> 00:25:10,770
Huwa ħafna aktar sempliċi milli taħseb li hu.

448
00:25:10,770 --> 00:25:13,330
I biss jixtiequ jagħmlu ċert
inti taf tips utli

449
00:25:13,330 --> 00:25:14,950
u tricks dwar kif għandek tagħmel dan.

450
00:25:14,950 --> 00:25:18,432
>> UDJENZA: Għaliex jista inti biss maqsuma
huwa fin-nofs bħal dik?

451
00:25:18,432 --> 00:25:21,390
Just tkun simili, OK, jien biss ser
jimpurtahom dawn l-ewwel [inaudible]?

452
00:25:21,390 --> 00:25:24,240
>> Professur: Għaliex dan huwa effettivament il-
Mod valuri hexadecimal huma rappreżentati.

453
00:25:24,240 --> 00:25:26,890
0X, li effettivament tfisser
xejn għajr tghidlek

454
00:25:26,890 --> 00:25:28,710
li huwa numru hexadeċimali.

455
00:25:28,710 --> 00:25:31,580
U dan dejjem jirrappreżenta
l-ewwel erba 'numri.

456
00:25:31,580 --> 00:25:34,330
U dan dejjem jirrappreżenta
l-aħħar erba 'numri.

457
00:25:34,330 --> 00:25:37,835
U hekk dawn iż-żewġ ċifri biss
jikkorrispondu għal bits differenti.

458
00:25:37,835 --> 00:25:39,200
>> UDJENZA: Allura aħna se always--

459
00:25:39,200 --> 00:25:41,830
>> Professur: Inti dejjem
se tikseb tmien bits valur.

460
00:25:41,830 --> 00:25:44,580
>> UDJENZA: Hija li bħad ħaġa
hawn jew li xi ħaġa madwar?

461
00:25:44,580 --> 00:25:46,883
Professur: Li jinsab biss
ħaġa fil-kompjuters, Yep.

462
00:25:46,883 --> 00:25:47,424
UDJENZA: OK.

463
00:25:47,424 --> 00:25:48,240
Tal-biża.

464
00:25:48,240 --> 00:25:51,290
>> Professur: Ukoll, hekk f'dan l-eżempju
aħna konvertiti minn binarja li deċimali,

465
00:25:51,290 --> 00:25:53,290
u minn binarja li hexadeċimali.

466
00:25:53,290 --> 00:25:56,610
Inti guys tixtieq li tagħmel żgur li int ukoll
prattika li jmorru l-mod ieħor madwar.

467
00:25:56,610 --> 00:26:03,370
Mela jekk jien ħadt 0XFF, inti tista
tiġbed li fl binarju, id-dritt?

468
00:26:03,370 --> 00:26:06,820
>> Inti jikkonvertu F fis binarju,
li hija waħda, wieħed, wieħed, wieħed,

469
00:26:06,820 --> 00:26:09,380
jikkonvertu F li binarju, li
hija waħda, wieħed, wieħed, wieħed.

470
00:26:09,380 --> 00:26:11,310
>> Allura aħna jista 'jgħidlek biex tagħmel
il-mod ieħor madwar.

471
00:26:11,310 --> 00:26:14,817
Allura deċimali lil binarju, jew
hexadeċimali għall binarja.

472
00:26:14,817 --> 00:26:16,650
Allura inti tixtieq li tagħmel
żgur li int taf żewġ modi.

473
00:26:16,650 --> 00:26:19,371
Aħna ser probabbilment nistaqsik
kombinazzjoni tat-tnejn.

474
00:26:19,371 --> 00:26:20,660
>> Yeah, inti għandek xi mistoqsija?

475
00:26:20,660 --> 00:26:22,724
I tista see-- int tajba?

476
00:26:22,724 --> 00:26:23,348
UDJENZA: Yeah.

477
00:26:23,348 --> 00:26:24,560
Professur: OK.

478
00:26:24,560 --> 00:26:26,101
Am I tajba biex iħassar din?

479
00:26:26,101 --> 00:26:26,600
Great.

480
00:26:26,600 --> 00:26:33,965

481
00:26:33,965 --> 00:26:40,437
>> Kull dritt, hekk tweġibiet are here jekk xi ħadd
Huwa kurjuż aktar tard u titħawwad.

482
00:26:40,437 --> 00:26:41,844
KOLLOX SEW.

483
00:26:41,844 --> 00:26:46,070
>> UDJENZA: Ma jimpurtax jekk npoġġux
ittri tagħna fl Capitol jew zghar?

484
00:26:46,070 --> 00:26:50,360
>> Professur: Hija ma, għaliex
f'hexadecimal, b'konvenzjoni,

485
00:26:50,360 --> 00:26:52,840
l-karattri huma uppercase.

486
00:26:52,840 --> 00:26:54,650
Allura A permezz F huma
se tkun uppercase.

487
00:26:54,650 --> 00:26:58,660
Jekk inti tpoġġi lowercase a, I do not know
jekk aħna neċessarjament jimmarkaw hija żbaljata.

488
00:26:58,660 --> 00:27:00,679
Iżda teoretikament,
li mhux teknikament

489
00:27:00,679 --> 00:27:01,970
kif int suppost biex dan.

490
00:27:01,970 --> 00:27:03,303
Allura dawn għandhom kollha jkunu uppercase.

491
00:27:03,303 --> 00:27:05,910
Yeah, mistoqsija tajba.

492
00:27:05,910 --> 00:27:07,780
>> KOLLOX SEW.

493
00:27:07,780 --> 00:27:08,790
Tieni domanda.

494
00:27:08,790 --> 00:27:12,750
Ikkunsidra dan il-programm sabiħ hawn.

495
00:27:12,750 --> 00:27:15,180
I ser jistaqsu l-mistoqsija,
I ser jiġu lura dan.

496
00:27:15,180 --> 00:27:23,170
>> Allura, l-ewwelnett, x'hemm ġewwa ta 'standard
io.h li l-ta 'interess għall-programm?

497
00:27:23,170 --> 00:27:26,640
It-tieni nett, dak li ma vojt
turi konformi tliet?

498
00:27:26,640 --> 00:27:30,572
U t-tielet, dak ma jirritornaw żero mill
prinċipali, kif line sitt, ġeneralment turi?

499
00:27:30,572 --> 00:27:33,280
Jekk inti guys tixtieq li jiktbu dawk
isfel, peress li jien jkollhom jaqilbu lura

500
00:27:33,280 --> 00:27:36,810
mal-pjastra biss sabiex inti tista 'tara kodiċi.

501
00:27:36,810 --> 00:27:40,400
Dan huwa eżempju ta ', bħal, forsi
kwistjoni f'livell ogħla fejn aħna nitolbuk

502
00:27:40,400 --> 00:27:42,435
liema affarijiet jfissru fi programm.

503
00:27:42,435 --> 00:27:47,290

504
00:27:47,290 --> 00:27:49,215
>> Kulħadd tajba għalija li
mur lura għall-slide?

505
00:27:49,215 --> 00:27:53,400

506
00:27:53,400 --> 00:27:54,361
OK, berred.

507
00:27:54,361 --> 00:27:57,610
So I ser jagħtuk guys simili forsi tlieta
minuti biex tħares lejn din malajr wieħed reali.

508
00:27:57,610 --> 00:28:41,330

509
00:28:41,330 --> 00:28:44,140
>> OK, sabiex dan tal wieħed simili
pjuttost faċli, kunċettwalment.

510
00:28:44,140 --> 00:28:49,280
Hawn xi ħadd li tixtieq li tell me x'hemm
ewwel ġewwa mill hash inkluż

511
00:28:49,280 --> 00:28:52,630
fajl standard tagħna librerija io.h?

512
00:28:52,630 --> 00:28:55,510
Għaliex għandna bżonn li librerija
inkluża għal dan il-programm?

513
00:28:55,510 --> 00:28:56,930
What hawn għandna bżonn għall?

514
00:28:56,930 --> 00:28:56,980
>> Yeah?

515
00:28:56,980 --> 00:28:58,340
>> UDJENZA: Hija li meta
inti tpoġġi li printf?

516
00:28:58,340 --> 00:28:59,131
>> Professur: Eżattament.

517
00:28:59,131 --> 00:29:01,780
Allura printf, kwalunkwe ħin li inti
jieħdu input mill-utent

518
00:29:01,780 --> 00:29:04,140
u tistampa xi ħaġa
għall-iskrin, li

519
00:29:04,140 --> 00:29:05,600
l-input standard, output librerija.

520
00:29:05,600 --> 00:29:07,170
Jaħsbu li dan way-- input, output.

521
00:29:07,170 --> 00:29:08,430
>> Do I jkollhom output?

522
00:29:08,430 --> 00:29:09,207
Iva, I do.

523
00:29:09,207 --> 00:29:12,040
So I jafu li jien dejjem se
bżonn l-librerija i.o standardizzati.

524
00:29:12,040 --> 00:29:16,400
>> Allura printf hija l-funzjoni
li bih nistgħu bżonn l-aċċess

525
00:29:16,400 --> 00:29:19,370
u hashtag jinkludu l
librerija standard i.o.

526
00:29:19,370 --> 00:29:20,280
KOLLOX SEW.

527
00:29:20,280 --> 00:29:22,660
>> It-tieni nett, huwa dak ma nulli jfissru?

528
00:29:22,660 --> 00:29:26,970
Għandna l-int prinċipali (vojt), dak ma
null hawn jfissirx hawn fuq il-linja tliet?

529
00:29:26,970 --> 00:29:28,080
Yeah, fid-dahar.

530
00:29:28,080 --> 00:29:29,020
>> UDJENZA: [inaudible]

531
00:29:29,020 --> 00:29:29,920
>> Professur: Eżattament.

532
00:29:29,920 --> 00:29:33,320
Mela ftakar, aħna stajt tgħallmu
tibda bil pset tagħna

533
00:29:33,320 --> 00:29:35,360
li inti tista 'attwalment
speċifika l-linja ta 'kmand

534
00:29:35,360 --> 00:29:39,010
argumenti dak il-programm tiegħek, li inti
, il-funzjoni prinċipali jieħu kif inti, l-utent,

535
00:29:39,010 --> 00:29:39,650
sejħa tiegħu.

536
00:29:39,650 --> 00:29:42,650
Jekk ikollna null, dan ifisser li inti
tista 'biss tmexxi l-programm direttament

537
00:29:42,650 --> 00:29:44,680
mingħajr ebda argument linja tal-kmand.

538
00:29:44,680 --> 00:29:46,160
Kulħadd ċara dwar dan?

539
00:29:46,160 --> 00:29:46,660
KOLLOX SEW.

540
00:29:46,660 --> 00:29:52,850
>> U fl-aħħar għaliex għandna jolqot tagħmel
din il-ħaġa ritorn żero hawn?

541
00:29:52,850 --> 00:29:54,740
Għalfejn nagħmlu anke jkollhom ewlenija int?

542
00:29:54,740 --> 00:29:57,330
Għaliex ma nistgħu biss għandhom null prinċipali null?

543
00:29:57,330 --> 00:29:59,216
Yeah?

544
00:29:59,216 --> 00:30:01,590
UDJENZA: Just sabiex inkunu nistgħu
kun żgur li l-programm huwa

545
00:30:01,590 --> 00:30:04,247
joħorġu b'suċċess, kif
kuntrarju jekk kien nnumerati.

546
00:30:04,247 --> 00:30:06,580
U aħna se nafu li dan huwa
tip differenti ta 'żball.

547
00:30:06,580 --> 00:30:07,621
>> Professur: Yeah, eżattament.

548
00:30:07,621 --> 00:30:10,670
Dan huwa biss ħafna
Ħaġa konvenzjonali li nagħmlu,

549
00:30:10,670 --> 00:30:13,840
li huwa biss fl-aħħar tal
programm tiegħek, biss biex tiżgura

550
00:30:13,840 --> 00:30:15,830
dik il-funzjoni prinċipali tiegħek
qed taħdem b'mod korrett,

551
00:30:15,830 --> 00:30:17,940
aħna dejjem trid tagħmel ritorn żero.

552
00:30:17,940 --> 00:30:21,160
Anki jekk aħna jista neċessarjament
ma tara dak stampat kullimkien.

553
00:30:21,160 --> 00:30:25,092
>> Għaliex kif programmaturi, inti taf, jekk
inti għandek ħafna linji differenti ta 'kodiċi

554
00:30:25,092 --> 00:30:27,050
u ma tafx fejn
dawn huma tmur ħażina,

555
00:30:27,050 --> 00:30:30,240
u jekk l-iżball iseħħ inti tixtieq li
kun żgur li inti tikseb dan l-iżball.

556
00:30:30,240 --> 00:30:33,240
U hekk tipikament jekk xi ħaġa tmur
ħażin aħna ser ikollhom ritorn ta 'wieħed biss

557
00:30:33,240 --> 00:30:34,669
biex niżguraw li jafu li huwa.

558
00:30:34,669 --> 00:30:36,460
Mela jekk inti tara ritorn
żero, li tipikament

559
00:30:36,460 --> 00:30:38,293
ifisser programm tiegħek huwa
rnexxew.

560
00:30:38,293 --> 00:30:40,490

561
00:30:40,490 --> 00:30:40,990
Tajba?

562
00:30:40,990 --> 00:30:45,180

563
00:30:45,180 --> 00:30:45,680
Kessaħ.

564
00:30:45,680 --> 00:30:48,710

565
00:30:48,710 --> 00:30:52,680
>> OK, it-tieni programm hawn.

566
00:30:52,680 --> 00:30:54,827
Ikkunsidra dan.

567
00:30:54,827 --> 00:30:56,910
U jekk inti guys tara
float, inti guys tista 'probabbilment

568
00:30:56,910 --> 00:31:00,810
jkollhom idea tajba ta 'dak
Li jien ser jgħidlek.

569
00:31:00,810 --> 00:31:05,200
>> Allura meta dan il-programm
tesegwixxi, kif tistgħu taraw,

570
00:31:05,200 --> 00:31:09,330
I am tiddikjara float
ġewwa funzjoni prinċipali tiegħi.

571
00:31:09,330 --> 00:31:13,470
Jien tismija "twieġeb," u jien iffissar
li egwali għal wieħed maqsum f'10.

572
00:31:13,470 --> 00:31:17,860
Jien istampar jagħmilhom, biex wieħed
punt deċimali, dak float.

573
00:31:17,860 --> 00:31:19,880
U allura jien jirritornaw żero.

574
00:31:19,880 --> 00:31:24,470
>> Allura meta jwettqu l-programm,
think lura għall greedy issa,

575
00:31:24,470 --> 00:31:26,550
dan il-programm stampi 0.0.

576
00:31:26,550 --> 00:31:29,993
Kif nafu lkoll, wieħed jittama aħna kollha
jafu, wieħed maqsum f'10 mhix 0.00,

577
00:31:29,993 --> 00:31:32,350
huwa 0.1.

578
00:31:32,350 --> 00:31:37,810
Iżda jispjega għaliex dan il-programm jaħseb
li 1 diviż bil 10 prints għal 0.1 oħra

579
00:31:37,810 --> 00:31:39,504
minn 0.1?

580
00:31:39,504 --> 00:31:42,545
I ser jagħtuk guys forsi bħal 30
sekondi għal ftit malajr jaħsbu dwar dak

581
00:31:42,545 --> 00:31:43,878
u I ser imorru lura għall-programm.

582
00:31:43,878 --> 00:32:17,800

583
00:32:17,800 --> 00:32:20,290
>> KOLLOX SEW.

584
00:32:20,290 --> 00:32:22,205
Kull min jixtiequ li jagħtuh xi sparatura?

585
00:32:22,205 --> 00:32:24,330
Fi tliet sentenzi jew inqas,
għaliex tipikament aħna qed

586
00:32:24,330 --> 00:32:27,650
ser jirrestrinġu tweġibiet kollha
tliet sentenzi jew inqas

587
00:32:27,650 --> 00:32:31,130
sabiex inti ma biss regurgitate
affarijiet bl-addoċċ għal fuq kwizz tiegħek.

588
00:32:31,130 --> 00:32:32,740
>> Yeah, tieħu xi sparatura.

589
00:32:32,740 --> 00:32:36,390
>> UDJENZA: Allura naħseb li hemm dan
ħaġa imsejħa, bħal, [inaudible]

590
00:32:36,390 --> 00:32:42,320
Allura jista 'jkun hemm, per eżempju,
jista 'jkun hemm, bħal, 0.09,

591
00:32:42,320 --> 00:32:47,250
li fejn tistampa l-ewwel
ċifri, ikun li 0.0?

592
00:32:47,250 --> 00:32:49,100
>> Professur: Agħlaq, pjuttost mhux.

593
00:32:49,100 --> 00:32:49,810
Christabell?

594
00:32:49,810 --> 00:32:51,770
>> UDJENZA: Inti diviż wieħed u
10, u dawn qed kemm interi.

595
00:32:51,770 --> 00:32:54,610
U għalhekk l-mod li għaddej
biex jaħżnuh huwa integer.

596
00:32:54,610 --> 00:32:56,480
U għalhekk l-eqreb numru sħiħ tkun 0.0.

597
00:32:56,480 --> 00:32:57,471
U hekk dan huwa 0.1.

598
00:32:57,471 --> 00:32:58,970
Professur: Yeah, dan huwa verament tajba.

599
00:32:58,970 --> 00:33:00,040
Dik hija t-tweġiba ġusta.

600
00:33:00,040 --> 00:33:03,597
Allura dan huwa konfużjoni ħafna
kunċett għal lott tal-gidjien.

601
00:33:03,597 --> 00:33:06,680
U jien verament jixtiequ jagħmlu ċert li
Dan huwa msaħħaħ fir-ras ta 'kulħadd.

602
00:33:06,680 --> 00:33:10,090
>> Allura dak li nsejħu f'wiċċ l-ilma
punt impreċiżjoni,

603
00:33:10,090 --> 00:33:12,800
fejn ir-raġuni għaliex ħafna
ta 'programmi tiegħek fil greedy

604
00:33:12,800 --> 00:33:17,010
ma ħadmux inizjalment kien minħabba li
inti nesa li jitfa varjabbli tiegħek.

605
00:33:17,010 --> 00:33:19,370
Allura dak Christabell qal
hija korretta.

606
00:33:19,370 --> 00:33:21,990
>> A float huwa intrinsikament impreċiż.

607
00:33:21,990 --> 00:33:26,400
Minħabba fil-kompjuter, id-dritt, għandna
ammont finit ta 'bits ta' memorja

608
00:33:26,400 --> 00:33:28,480
nistgħu nużaw biex jirrappreżentaw numri.

609
00:33:28,480 --> 00:33:33,480
Għalhekk, per eżempju, dan CS50 ID is--
Naħseb li huwa kompjuter 64-bit.

610
00:33:33,480 --> 00:33:37,520
>> A float jistax jiġi rappreżentat biss
b'ammont finit ta 'dawk bits.

611
00:33:37,520 --> 00:33:42,260
U hekk 0.1 b'żero infinita,
li kienet 0.1 huwa, right?

612
00:33:42,260 --> 00:33:45,450
Iżda ma nistgħux attwalment jaħżnu
dak in-numru fil-kompjuter tagħna.

613
00:33:45,450 --> 00:33:47,810
Aħna biss ma jkollhomx
memorja biżżejjed biex jagħmlu dan.

614
00:33:47,810 --> 00:33:52,340
>> U għalhekk l-eqreb approssimazzjoni tal
x'hemm maħżuna fil-memorja huwa attwalment

615
00:33:52,340 --> 00:33:55,390
xi ħaġa simili 0.000 xi ħaġa,
xi ħaġa, xi ħaġa, xi ħaġa.

616
00:33:55,390 --> 00:34:01,240
Li, ladarba inti truncate
dan, rawnds isfel għal 0.0.

617
00:34:01,240 --> 00:34:05,640
>> U għalhekk dan l-eżempju huwa biss wieħed
li turi lottijiet ta 'kwistjonijiet

618
00:34:05,640 --> 00:34:08,469
għandna kull meta aħna qed
tipprova tagħmel ħażin matematika

619
00:34:08,469 --> 00:34:11,000
mingħajr ikkastjar bħala numru sħiħ differenti.

620
00:34:11,000 --> 00:34:14,870
Hekk biss tkun attenta li dan jiġri.

621
00:34:14,870 --> 00:34:18,239
>> Fuq kwizzijiet, jekk aħna nagħtuk
blokk ta 'kodiċi u huwa simili,

622
00:34:18,239 --> 00:34:19,510
dak prints fl-aħħar?

623
00:34:19,510 --> 00:34:24,096
U jekk huwa xi valur każwali għalik
guys għandhom ikunu jafu għaliex dan jiġri.

624
00:34:24,096 --> 00:34:24,909
Yeah?

625
00:34:24,909 --> 00:34:27,926
>> UDJENZA: truncate huwa teħles minn
kollox wara ċertu punt?

626
00:34:27,926 --> 00:34:28,513
[Inaudible]

627
00:34:28,513 --> 00:34:30,929
Professur: Yeah, hekk fil-fatt
dan huwa eżempju tassew ħżiena,

628
00:34:30,929 --> 00:34:37,870
minħabba 0.100 x'ikun attwalment
ikun truncate isfel sa 0.1.

629
00:34:37,870 --> 00:34:41,389
Imma jekk ġejt biex imexxu it-- I ma
ftakar, minħabba aħħar sena li

630
00:34:41,389 --> 00:34:42,830
dam fuq programm differenti.

631
00:34:42,830 --> 00:34:45,300
Huma dam fil xi ħaġa imsejħa
il Appliance CS50, li

632
00:34:45,300 --> 00:34:46,389
huwa differenti mill-ID.

633
00:34:46,389 --> 00:34:48,520
Li kienet sistema 32-bit, I think.

634
00:34:48,520 --> 00:34:50,290
U hekk kien hemm numri differenti.

635
00:34:50,290 --> 00:34:53,330
>> Iżda essenzjalment, biss jafu li
il-kunċett sħiħ ta truncation

636
00:34:53,330 --> 00:34:54,815
u kif hija biss qatgħat off affarijiet.

637
00:34:54,815 --> 00:34:55,690
U għalhekk jekk rounds--

638
00:34:55,690 --> 00:34:56,300
>> UDJENZA: Mingħajr arrotondament.

639
00:34:56,300 --> 00:34:57,370
>> Professur: Eżattament.

640
00:34:57,370 --> 00:34:57,870
Yeah.

641
00:34:57,870 --> 00:35:02,330

642
00:35:02,330 --> 00:35:04,380
Kessaħ.

643
00:35:04,380 --> 00:35:05,250
>> Hi, fid-dahar.

644
00:35:05,250 --> 00:35:07,634
Aħna biss jmorru fuq xi
mistoqsijiet reviżjoni kwizz.

645
00:35:07,634 --> 00:35:08,430
>> Kull dritt.

646
00:35:08,430 --> 00:35:10,150
Għalhekk tikkunsidra programm differenti hawn.

647
00:35:10,150 --> 00:35:12,797

648
00:35:12,797 --> 00:35:15,380
Jien ser jagħtuk guys a
ftit minuti biex taqra fuq dan.

649
00:35:15,380 --> 00:35:18,588
Din hija xi ħaġa li kienet għal ħafna
reċentement li naħseb nefaħ ħafna minnkom

650
00:35:18,588 --> 00:35:19,142
imħuħ guys taċ.

651
00:35:19,142 --> 00:35:21,100
Iżda aħna qed tmur biex jitkellmu
permezz ta 'dan mill-ġdid biss

652
00:35:21,100 --> 00:35:24,152
biex tagħmel żgur li int
jifhmu kompletament.

653
00:35:24,152 --> 00:35:24,652
KOLLOX SEW.

654
00:35:24,652 --> 00:35:41,280

655
00:35:41,280 --> 00:35:41,780
KOLLOX SEW.

656
00:35:41,780 --> 00:35:44,342
Kulħadd jeħtieġ aktar żmien biex
tinqara permezz din il-kodiċi?

657
00:35:44,342 --> 00:35:45,650
KOLLOX SEW.

658
00:35:45,650 --> 00:35:50,630
>> Għalhekk jidhirli li
f'dan il-programm jien

659
00:35:50,630 --> 00:35:53,460
ħolqien ta 'żewġ kordi bl-użu GetString.

660
00:35:53,460 --> 00:35:55,180
Wieħed imsejħa s u wieħed imsejjaħ t.

661
00:35:55,180 --> 00:35:58,680
U jekk dawn qed ugwali
ugwali ma 'xulxin,

662
00:35:58,680 --> 00:36:00,880
għandu jistampa "You
tip l-istess ħaġa. "

663
00:36:00,880 --> 00:36:04,170
>> Iżda elsewise, ikun jistampa, "You
ittajpjat affarijiet differenti, "id-dritt?

664
00:36:04,170 --> 00:36:05,990
Tidher ħafna, sempliċi ħafna.

665
00:36:05,990 --> 00:36:08,720
Iżda, madankollu, jekk I attwalment
tipprova tikteb dan il-programm,

666
00:36:08,720 --> 00:36:12,230
jidher li anke meta I
input l-istess kordi eżatt,

667
00:36:12,230 --> 00:36:15,490
xorta prints out, "You
ittajpjat affarijiet differenti! "

668
00:36:15,490 --> 00:36:18,020
Hawn xi ħadd li tixtieq li tieħu
shot lejn għaliex dan il-programm dejjem

669
00:36:18,020 --> 00:36:20,370
twieġeb li l-inputs
huma differenti, anki

670
00:36:20,370 --> 00:36:22,090
meta l-kliem stess huma l-istess?

671
00:36:22,090 --> 00:36:24,870

672
00:36:24,870 --> 00:36:29,170
>> Mela jekk jien kellhom input-- David imħabba
tuża eżempju bħal mom, id-dritt?

673
00:36:29,170 --> 00:36:37,890
Zghar M-O-M għall S, T
ugwali zghar M-O-M.

674
00:36:37,890 --> 00:36:40,340
Jekk I dam dan permezz
dan il-kodiċi, għaliex kieku dan

675
00:36:40,340 --> 00:36:44,180
jistampa "inti ittajpjat affarijiet differenti?"

676
00:36:44,180 --> 00:36:46,336
>> Hawn xi ħadd bżonn aktar
ħin biex jaħsbu dwar dan?

677
00:36:46,336 --> 00:36:47,294
OK, I think we qed tajba.

678
00:36:47,294 --> 00:36:48,716
Yeah?

679
00:36:48,716 --> 00:36:53,930
>> UDJENZA: OK, dan huwa xi ħaġa dwar
fejn huwa maħżun fil-memorja, right?

680
00:36:53,930 --> 00:36:54,890
>> Professur: Yep.

681
00:36:54,890 --> 00:37:00,400
>> UDJENZA: Fejn huwa simili, jekk dan
string s hija maħżuna fil-memorja spot--

682
00:37:00,400 --> 00:37:01,689
Jien invenzjoni this-- huwa żero.

683
00:37:01,689 --> 00:37:02,355
Professur: Sure.

684
00:37:02,355 --> 00:37:05,290
UDJENZA: U t string
hija maħżuna fil-post tal-memorja,

685
00:37:05,290 --> 00:37:11,000
bħal, 167, u mbagħad
żero ma tkunx daqs 167.

686
00:37:11,000 --> 00:37:12,610
>> Professur: Eżattament.

687
00:37:12,610 --> 00:37:18,350
OK, sabiex tiftakar dan inkredibbli
rivelazzjoni aħna spjegat lilek guys

688
00:37:18,350 --> 00:37:21,530
din il-ġimgħa passat, li
ma tassew jeżistu kordi?

689
00:37:21,530 --> 00:37:25,380
Meta aħna joħolqu xi ħaġa imsejħa
string aħna qed, fir-realtà,

690
00:37:25,380 --> 00:37:29,330
joħolqu xi ħaġa imsejħa star char.

691
00:37:29,330 --> 00:37:34,470
Li kollox huwa huwa pointer li
string jew għal firxa ta 'Chars.

692
00:37:34,470 --> 00:37:39,480
>> U hekk f'dan l-eżempju, jekk I
kellhom input M-O-M-triq

693
00:37:39,480 --> 00:37:49,350
li l-kompjuter tiegħi taħżen huwa
fi ħdan memorja backslash żero, id-dritt?

694
00:37:49,350 --> 00:37:53,180
Dawn l-erba karattri, Chars,
tkun maħżuna x'imkien.

695
00:37:53,180 --> 00:37:59,290
>> U mbagħad dawn l-erba
karattri, backslash żero,

696
00:37:59,290 --> 00:38:01,275
huma maħżuna x'imkien ieħor, id-dritt?

697
00:38:01,275 --> 00:38:04,685
Għandi l-ebda idea fejn l-indirizzi
huma, dawn qed x'imkien fil-kompjuter tiegħi.

698
00:38:04,685 --> 00:38:07,080
Imma jien ma jafu eżattament fejn huma.

699
00:38:07,080 --> 00:38:10,170
>> Meta I joħolqu string
i, dak kollu li verament huwa

700
00:38:10,170 --> 00:38:15,550
huwa pointer għall-
bidu ta 'din is-sekwenza.

701
00:38:15,550 --> 00:38:21,130
U meta I joħolqu dan il-valur t,
dak kollu li huwa pointer li hawn.

702
00:38:21,130 --> 00:38:23,980
U hekk meta inti qed tipprova
li jqabblu u jivverifika

703
00:38:23,980 --> 00:38:27,710
biex tara jekk i huwa ugwali
ugwali ta 't, il-kompjuter

704
00:38:27,710 --> 00:38:31,635
huwa verament ftit jirritornaw lejn
inti l-indirizz ta 'dan m

705
00:38:31,635 --> 00:38:33,390
u l-indirizz ta 'dak m.

706
00:38:33,390 --> 00:38:36,230
U għaliex qed żewġ
biċċiet separati ta 'data

707
00:38:36,230 --> 00:38:38,750
li huma reġistrati f'żewġ differenti
indirizzi fil-kompjuter tiegħek,

708
00:38:38,750 --> 00:38:41,750
kompjuter tiegħek qatt se
jagħrfu lilhom bħala l-istess.

709
00:38:41,750 --> 00:38:43,500
Hawn xi ħadd li tixtieq li
jagħtu xi sparatura fil dak li aħna

710
00:38:43,500 --> 00:38:46,900
għandek tagħmel jekk ridna biex jikkoreġu
dan u jkollhom programm running korretta

711
00:38:46,900 --> 00:38:49,360
minflok?

712
00:38:49,360 --> 00:38:52,070
Aħseb dwar li għal ftit sekondi.

713
00:38:52,070 --> 00:38:54,929
What do we bżonn għall-bidla għall
jiksbu dan it-tħaddim programm

714
00:38:54,929 --> 00:38:56,220
il-mod irridu li jiffunzjona?

715
00:38:56,220 --> 00:39:17,260

716
00:39:17,260 --> 00:39:18,918
>> Yeah, tixtieq li tieħu stab lejn dan?

717
00:39:18,918 --> 00:39:24,082
>> UDJENZA: Nistgħu nippruvaw dereference l
pointer u jivverifika permezz tal-firxa?

718
00:39:24,082 --> 00:39:25,540
Professur: Li mod wieħed biex tagħmel dan.

719
00:39:25,540 --> 00:39:27,880
Allura, x'hemm isem tiegħek mill-ġdid?

720
00:39:27,880 --> 00:39:29,010
Jien sorry, ifakkru lili.

721
00:39:29,010 --> 00:39:29,589
>> Zee: Zee.

722
00:39:29,589 --> 00:39:32,130
Professur: Yeah, iva, liema Zee
ssuġġerit assolutament jaħdmu.

723
00:39:32,130 --> 00:39:32,629
Dritt?

724
00:39:32,629 --> 00:39:35,730
Nistgħu dereference l pointer
u fil-fatt imorru u aċċess

725
00:39:35,730 --> 00:39:38,460
id-dejta fiżika ġewwa minn hawn.

726
00:39:38,460 --> 00:39:40,300
U nistgħu biss iqabbel
l-iskrin kollu.

727
00:39:40,300 --> 00:39:43,670
>> Nistgħu ngħidu, OK, pointer,
tagħti me x'hemm ġewwa hawn.

728
00:39:43,670 --> 00:39:44,960
Dan se jerġa 'lura għal m.

729
00:39:44,960 --> 00:39:47,168
U jien ngħid, pointer,
tagħti me x'hemm ġewwa hawn.

730
00:39:47,168 --> 00:39:47,750
Ritorn ta 'm.

731
00:39:47,750 --> 00:39:48,410
Do dawk match?

732
00:39:48,410 --> 00:39:49,410
Iva.

733
00:39:49,410 --> 00:39:50,340
Imbagħad nimxu fuq.

734
00:39:50,340 --> 00:39:54,240
>> Inżommu iċċekkjar it-tnejn kollu
kordi it-triq kollha sa l-aħħar

735
00:39:54,240 --> 00:39:56,635
u ara jekk dawn huma ugwali,
jekk il-valuri kollha huma ugwali.

736
00:39:56,635 --> 00:39:59,680
U jekk il-valuri kollha huma ugwali,
allura nafu l-kordi huma veri.

737
00:39:59,680 --> 00:40:01,600
Assolutament, li kif aħna se tagħmel dan?

738
00:40:01,600 --> 00:40:03,930
>> Ħadd ma konfuż fuq xi parti minn dan?

739
00:40:03,930 --> 00:40:06,970
Il-kunċett sħiħ ta 'kif kordi
huma verament ftit pointers,

740
00:40:06,970 --> 00:40:08,440
u kif dawn ma tassew jeżistu?

741
00:40:08,440 --> 00:40:10,480
U għaliex irridu jiksbu l-iżbalji
bħall-mod kif aħna ġġibu?

742
00:40:10,480 --> 00:40:15,070
Minħabba I garanzija li inti guys, pointers
u l-allokazzjoni string u l-memorja

743
00:40:15,070 --> 00:40:16,470
huma se toħroġ.

744
00:40:16,470 --> 00:40:17,410
>> Yeah?

745
00:40:17,410 --> 00:40:21,072
>> UDJENZA: [inaudible] dereference
dan, inti biss jitqiegħed stilla [inaudible]

746
00:40:21,072 --> 00:40:21,780
Professur: Dritt.

747
00:40:21,780 --> 00:40:28,430
Allura biex derererence pointer mezz
tmur f'dak indirizz tal-pointer

748
00:40:28,430 --> 00:40:30,390
u jiksbu d-data, il-valur hemmhekk.

749
00:40:30,390 --> 00:40:32,700
U l-mod biex isir dan huwa pointer star.

750
00:40:32,700 --> 00:40:34,262
Ma jħawdux dan.

751
00:40:34,262 --> 00:40:35,186
>> UDJENZA: [inaudible].

752
00:40:35,186 --> 00:40:35,852
>> Professur: Yeah.

753
00:40:35,852 --> 00:40:39,750
UDJENZA: Allura inti tista 'tikteb biss
jekk star s indaqs t ugwali star.

754
00:40:39,750 --> 00:40:40,630
>> Professur: Well, no.

755
00:40:40,630 --> 00:40:40,960
No

756
00:40:40,960 --> 00:40:41,640
>> UDJENZA: Li mhux tajjeb biżżejjed, id-dritt?

757
00:40:41,640 --> 00:40:43,760
>> Professur: Mhuwiex, għax int
biss verifika tal-ewwel ittra.

758
00:40:43,760 --> 00:40:46,010
Int probabilment se
bżonn xi tip ta 'linja li

759
00:40:46,010 --> 00:40:49,055
itenni permezz ta 'kull wieħed
karattru fiż-żewġ kordi.

760
00:40:49,055 --> 00:40:49,837
Yeah.

761
00:40:49,837 --> 00:40:52,920
Mela jekk inti riedu jiċċekkjaw biss biex tara
jekk huma bdew bl-istess ħaġa,

762
00:40:52,920 --> 00:40:58,220
inti tista 'tagħmel jekk, star
i huwa ugwali għal star t.

763
00:40:58,220 --> 00:41:01,300
Imbagħad inti taf li talanqas dawn
beda bl-istess karattru.

764
00:41:01,300 --> 00:41:01,952
>> Yeah?

765
00:41:01,952 --> 00:41:04,056
>> UDJENZA: Allura l-mod
inti li tkun

766
00:41:04,056 --> 00:41:06,064
bħal inkorporati għal loop jew pointer?

767
00:41:06,064 --> 00:41:06,730
Professur: Yeah.

768
00:41:06,730 --> 00:41:08,170
Pretty ħafna biss għall loop.

769
00:41:08,170 --> 00:41:12,430
Ftakar, David fil-klassi imsemmi
iz-zokkor sintattika ħielsa?

770
00:41:12,430 --> 00:41:17,690
U kellu din ħafna
ħaġa konfuża ta stilla t

771
00:41:17,690 --> 00:41:22,030
plus wieħed, fejn ikun tintegra
permezz u jimxu l-pointer?

772
00:41:22,030 --> 00:41:29,910
Il-mod ta 'kif isir aktar faċli
dan huwa biss t ta 'i.

773
00:41:29,910 --> 00:41:31,090
>> Allura huwa biss firxa.

774
00:41:31,090 --> 00:41:34,630
Il-mod li inti jkollok għal
loop li dam minn żero għal i, fejn

775
00:41:34,630 --> 00:41:36,580
i huwa t-tul tal-
spag, inti tista 'biss

776
00:41:36,580 --> 00:41:39,510
jikteb li minflok tagħmel l-
pointer kollu, ħaġa referenza.

777
00:41:39,510 --> 00:41:43,510
Allura dawn affarijiet huma eżattament
ekwivalenti fil-kompjuter tiegħek.

778
00:41:43,510 --> 00:41:45,905
>> You guys probabbilment mhux se
bżonn tkun taf li,

779
00:41:45,905 --> 00:41:48,280
iżda dan huwa tajjeb li biss tip ta '
jkollhom fil-dahar moħħok.

780
00:41:48,280 --> 00:41:52,630
Biss jafu li l-kompjuter
jirrikonoxxi blokki differenti ta 'kodiċi

781
00:41:52,630 --> 00:41:53,890
bħala l-istess ħaġa.

782
00:41:53,890 --> 00:41:57,510
Minħabba li dan huwa biss ferm aktar utent
faċli għalina biex jippreżentawha simili huwa

783
00:41:57,510 --> 00:41:58,150
firxa.

784
00:41:58,150 --> 00:42:00,990
Huwa biss aktar faċli.

785
00:42:00,990 --> 00:42:02,719
>> UDJENZA: Allura l-użu strlen biex simili, get--

786
00:42:02,719 --> 00:42:03,385
Professur: Yeah.

787
00:42:03,385 --> 00:42:03,926
UDJENZA: OK.

788
00:42:03,926 --> 00:42:05,940
Professur: Inti tista
użu strlen jew, jekk inti

789
00:42:05,940 --> 00:42:10,420
ma kellhomx strlen inti tista 'biss tagħmel up
sakemm inti hit backslash żero għat-tnejn.

790
00:42:10,420 --> 00:42:11,568
Jew tkun taħdem.

791
00:42:11,568 --> 00:42:12,068
Yeah.

792
00:42:12,068 --> 00:42:14,871

793
00:42:14,871 --> 00:42:17,996
UDJENZA: Allura huwa li dereference kull
karattru uniku jekk konna attwalment

794
00:42:17,996 --> 00:42:21,044
miktub dan il-kodiċi, aħna
tista 'biss tagħmel t parentesi i

795
00:42:21,044 --> 00:42:22,460
Bħal ma 'l-istilla quddiem ta' dan?

796
00:42:22,460 --> 00:42:27,700
>> Professur: Yeah, huwa daqs huwa daqs i
parentesi i, u imbagħad żomm jiċċaqalqu i

797
00:42:27,700 --> 00:42:29,790
down up sakemm inti hit l-aħħar.

798
00:42:29,790 --> 00:42:31,286
Yeah, dan huwa dak li inti tagħmel.

799
00:42:31,286 --> 00:42:33,660
U jien ser fil-fatt ikollhom jmiss
Eżempju ta 'meta aħna fil-fatt

800
00:42:33,660 --> 00:42:36,740
jiktbu strlen hekk inti guys se tip
tal nikseb jilagħbu madwar miegħu ftit.

801
00:42:36,740 --> 00:42:43,567
>> Allura huwa kulħadd ċar fuq biss memorja,
kordi, pointers, indirizzi kwalità?

802
00:42:43,567 --> 00:42:46,650
Xi kunċetti livell ogħla li inti
għall żgur se ħtieġa li jkunu jafu dwar il-kwizz

803
00:42:46,650 --> 00:42:48,928
għada.

804
00:42:48,928 --> 00:42:49,904
>> Kull dritt.

805
00:42:49,904 --> 00:42:50,404
Tajba.

806
00:42:50,404 --> 00:42:54,824

807
00:42:54,824 --> 00:42:55,324
Yep.

808
00:42:55,324 --> 00:42:58,770

809
00:42:58,770 --> 00:43:04,180
OK, hekk ħaġa waħda li aħna ser jitolbu wkoll
inti, kif nagħmlu kull sena fuq kwizz, huwa,

810
00:43:04,180 --> 00:43:08,340
jissoponi li inti stajt minsija (li
aħna jidhru li tinsa li tagħmel kull sena)

811
00:43:08,340 --> 00:43:10,810
li fihom fajl header strlen jiġi ddikjarat.

812
00:43:10,810 --> 00:43:13,860
U hekk aħna li jikteb dan nfusna.

813
00:43:13,860 --> 00:43:16,350
>> Hawnhekk huma lista ta 'linji gwida
li nistgħu preżenti inti

814
00:43:16,350 --> 00:43:20,660
guys fejn ikollok li wieħed jassumi li
i l-sekwenza mhux se jkun null.

815
00:43:20,660 --> 00:43:23,830
Inti jista 'jassumi li s se jkun
terminat bil backslash żero.

816
00:43:23,830 --> 00:43:26,670
Allura inti taf dak hu li
li għaddej biex jispiċċa bil.

817
00:43:26,670 --> 00:43:29,500
>> U, per eżempju, li l-
tul ta 'bonjour tkun ħamsa.

818
00:43:29,500 --> 00:43:32,890
Allura inti tista 'tassumi li bonjour
se jkun ta 'ħamsa, H-E-L-L-O.

819
00:43:32,890 --> 00:43:35,890
Inti ma għandekx li wieħed jassumi li l-
backside żero kontijiet għat-tul.

820
00:43:35,890 --> 00:43:39,720

821
00:43:39,720 --> 00:43:42,300
>> Dan l-aħħar ħaġa hawn, ma
inkwetati dwar overflow numru sħiħ.

822
00:43:42,300 --> 00:43:45,270
Hawn xi ħadd ftakar
overflow dak integer huwa?

823
00:43:45,270 --> 00:43:48,041
>> UDJENZA: Tmur lil hinn mill-
tul tal-[inaudible].

824
00:43:48,041 --> 00:43:50,740
>> Professur: Yeah, tista 'tispjega
a bit, xi jfisser?

825
00:43:50,740 --> 00:43:55,330
>> UDJENZA: Allura, I raden din tmur lura
mal-eżempju truncating qabel.

826
00:43:55,330 --> 00:43:58,380
Imma jekk għandek biss numri tant
li jmorru lil hinn mill-għadd ta 'bits

827
00:43:58,380 --> 00:44:01,409
li inti tista 'attwalment tassenja din
li se biss tip ta 'cut off.

828
00:44:01,409 --> 00:44:04,242
Professur: Yeah, hekk fuq tipiku
kompjuter, kemm bits għandna?

829
00:44:04,242 --> 00:44:05,306
UDJENZA: 32?

830
00:44:05,306 --> 00:44:06,430
Professur: Yeah, 32, id-dritt.

831
00:44:06,430 --> 00:44:10,030
U hekk dan huwa, dak, erba
biljun, żewġ biljun?

832
00:44:10,030 --> 00:44:13,579
Erba 'biljun, sa erba' biljun
interi pożittivi, id-dritt?

833
00:44:13,579 --> 00:44:15,370
Żewġ biljun negattiv,
żewġ biljun pożittiv,

834
00:44:15,370 --> 00:44:16,900
jiddependi fuq kif inti tixtieq li tagħmel dan.

835
00:44:16,900 --> 00:44:21,470
>> U hekk bażikament li jista 'jkollna
interi biżżejjed li tista 'tmur up

836
00:44:21,470 --> 00:44:25,800
għal tnejn mal-31 minus 1, id-dritt?

837
00:44:25,800 --> 00:44:27,980
Minħabba li ladarba aħna hit żewġ
l-32, aħna ma

838
00:44:27,980 --> 00:44:30,040
jkollu dik memorja ħafna fil-kompjuter tagħna.

839
00:44:30,040 --> 00:44:32,310
>> U għalhekk, teoretikament, I
tista 'toħroġ ma' numru

840
00:44:32,310 --> 00:44:34,560
jiġifieri, simili, tnejn għall-46.

841
00:44:34,560 --> 00:44:38,040
Huwa numru enormi ħmar, iżda
teoretikament inti tista '.

842
00:44:38,040 --> 00:44:42,730
U overflow hekk integer huwa jekk inti tipprova
toħloq numru sħiħ li tmur lil hinn minn dak li

843
00:44:42,730 --> 00:44:44,790
kompjuter tiegħek huwa kapaċi li jaħżen.

844
00:44:44,790 --> 00:44:46,590
>> U għalhekk inti guys għall
dan l-eżempju ma jkollhomx

845
00:44:46,590 --> 00:44:51,330
joqogħdu jinkwetaw dwar us giving you a giant
sekwenza li hija darbtejn għal l Chars 32

846
00:44:51,330 --> 00:44:51,830
twil.

847
00:44:51,830 --> 00:44:54,010
Dan ikun ifisser verament.

848
00:44:54,010 --> 00:44:59,430
>> Kull dritt, hekk jien biss se jagħtu
inti guys l-istruttura bażi ta 'dan.

849
00:44:59,430 --> 00:45:02,020
Inti qed tmur biex jinħoloq
funzjoni msejħa int strlen fejn

850
00:45:02,020 --> 00:45:08,436
a jgħaddu fi, stilla char, jew spag,
pointer għall-sekwenza imsejħa s.

851
00:45:08,436 --> 00:45:10,820
>> Kopja dritt kollox, kulħadd li isfel.

852
00:45:10,820 --> 00:45:13,550

853
00:45:13,550 --> 00:45:14,850
Kessaħ.

854
00:45:14,850 --> 00:45:17,020
Oops-- mod ieħor.

855
00:45:17,020 --> 00:45:21,360
>> Allura dan huwa tip simili ta '
biċċa diffiċli ta 'problema,

856
00:45:21,360 --> 00:45:25,320
so I ser jagħtuk guys forsi ħamsa sa
sitt minuti biex tip ta 'brainstorm

857
00:45:25,320 --> 00:45:27,478
u jiktbu din il-funzjoni out.

858
00:45:27,478 --> 00:45:29,710
>> UDJENZA: Aħna ma
kont għal [inaudible],

859
00:45:29,710 --> 00:45:30,200
aħna ma jkollhom jużaw numru sħiħ?

860
00:45:30,200 --> 00:45:31,241
>> Professur: Le, inti ma.

861
00:45:31,241 --> 00:48:05,847

862
00:48:05,847 --> 00:48:06,930
I ser jagħtuk guys ħjiel.

863
00:48:06,930 --> 00:48:12,325
A loop filwaqt li jista 'jkun utli ħafna hawn.

864
00:48:12,325 --> 00:48:12,825
Yeah.

865
00:48:12,825 --> 00:48:44,995

866
00:48:44,995 --> 00:48:45,495
Hawn

867
00:48:45,495 --> 00:48:45,995
kandju.

868
00:48:45,995 --> 00:48:49,980

869
00:48:49,980 --> 00:48:53,410
Kandju se jkunu disponibbli wkoll
għall-kwizz, I think.

870
00:48:53,410 --> 00:48:55,315
Allura inti guys se jkunu kollha
sugared up għada.

871
00:48:55,315 --> 00:49:01,110

872
00:49:01,110 --> 00:49:02,962
Jista I-- inti ltqajna.

873
00:49:02,962 --> 00:49:03,718
>> UDJENZA: OK.

874
00:49:03,718 --> 00:49:04,384
Professur: Yeah.

875
00:49:04,384 --> 00:49:10,550

876
00:49:10,550 --> 00:49:11,870
>> Forsi 30 sekonda aktar jew hekk.

877
00:49:11,870 --> 00:50:02,220

878
00:50:02,220 --> 00:50:07,340
>> Kull dritt, jekk int
ma jsirx, l-ebda inkwiet.

879
00:50:07,340 --> 00:50:08,810
Aħna ser jimxu permezz ta 'dan flimkien.

880
00:50:08,810 --> 00:50:09,310
KOLLOX SEW.

881
00:50:09,310 --> 00:50:13,800
Hekk jien ser biss il-format il-
istruttura bażika għal din il-funzjoni hawnhekk.

882
00:50:13,800 --> 00:50:17,255
Int strlen.

883
00:50:17,255 --> 00:50:20,040

884
00:50:20,040 --> 00:50:23,460
L-ewwel, ma kull min jixtiequ li tgħid
me dak li int ifisser?

885
00:50:23,460 --> 00:50:25,160
Għandna bżonn li jkollhom fil din il-funzjoni.

886
00:50:25,160 --> 00:50:26,709
>> UDJENZA: Strlen [inaudible].

887
00:50:26,709 --> 00:50:27,500
Professur: Eżattament.

888
00:50:27,500 --> 00:50:31,140
Sabiex ikun x'ikun jiġri fil hawn,
għandna bżonn li jirritornaw numru sħiħ.

889
00:50:31,140 --> 00:50:36,367
U kif speċifikat fil-
spec, irridu li return--

890
00:50:36,367 --> 00:50:37,700
Mur għaliha guys, biss iżommu għaddejjin.

891
00:50:37,700 --> 00:50:40,480
Dan kollu tajjeb.

892
00:50:40,480 --> 00:50:42,960
Kul dan kollu so I ma jkollhom
li tieħu lura, fil-fatt.

893
00:50:42,960 --> 00:50:46,022

894
00:50:46,022 --> 00:50:48,855
L-int biss ifisser li int
ser jiġi lura numru sħiħ.

895
00:50:48,855 --> 00:50:55,350

896
00:50:55,350 --> 00:50:57,106
>> X'inhu dan char star s?

897
00:50:57,106 --> 00:50:58,640
Xi tfisser?

898
00:50:58,640 --> 00:51:00,879
>> UDJENZA: Simili, dak li qed input.

899
00:51:00,879 --> 00:51:01,670
Professur: Eżattament.

900
00:51:01,670 --> 00:51:04,142
U dak huwa kważi l-
istess ħaġa bħat star char?

901
00:51:04,142 --> 00:51:04,850
UDJENZA: String?

902
00:51:04,850 --> 00:51:05,641
Professur: Eżattament.

903
00:51:05,641 --> 00:51:09,080
Allura kollox aħna qed tagħmel huwa li jagħti
din pointer għal string.

904
00:51:09,080 --> 00:51:09,580
KOLLOX SEW.

905
00:51:09,580 --> 00:51:12,860

906
00:51:12,860 --> 00:51:13,360
Kessaħ.

907
00:51:13,360 --> 00:51:16,650
>> Ukoll, ma ninsewx, jekk ninsew
li jtik dawn parentesi,

908
00:51:16,650 --> 00:51:18,330
ma ninsewx li tikteb yourself.

909
00:51:18,330 --> 00:51:20,720
Minħabba teoretikament, kodiċi tiegħek huwa
żbaljata jekk tinsa jiktbu għalihom.

910
00:51:20,720 --> 00:51:21,803
Just dejjem tingħata attenzjoni.

911
00:51:21,803 --> 00:51:23,750
Bħal, affarijiet ftit
li inti ma avviż

912
00:51:23,750 --> 00:51:26,917
meta int programmazzjoni fuq laptop tiegħek,
minħabba laptop tiegħek ma għalik?

913
00:51:26,917 --> 00:51:28,624
Tinsiex meta
int bil-miktub bl-idejn.

914
00:51:28,624 --> 00:51:29,170
Yeah?

915
00:51:29,170 --> 00:51:30,954
>> UDJENZA: Imma kif żbaljata?

916
00:51:30,954 --> 00:51:33,190
Bħal, se nilħqu l-problema kollha ħażina?

917
00:51:33,190 --> 00:51:34,190
>> Professur: No, no.

918
00:51:34,190 --> 00:51:34,860
Tinkwetax.

919
00:51:34,860 --> 00:51:39,270
Huwa fil-fatt teoretikament possibbli
għalik biex tikseb punti sħiħa dwar kwistjoni

920
00:51:39,270 --> 00:51:41,980
anke jekk il-kodiċi tiegħek se
qatt ma spiċċawlhiex fil-ħajja reali.

921
00:51:41,980 --> 00:51:46,052
Nissuġġerixxi inti ma tippruvax
biex naraw li dan iseħħ.

922
00:51:46,052 --> 00:51:48,260
Per eżempju, bħal jekk kollox
thats hawn huwa dritt,

923
00:51:48,260 --> 00:51:51,850
imma tinsa kolon jew parentesi,
kodiċi tiegħek mhux se tmexxi effettivament.

924
00:51:51,850 --> 00:51:53,740
Iżda inkunu ħniena.

925
00:51:53,740 --> 00:51:54,394
>> Yeah?

926
00:51:54,394 --> 00:51:56,050
>> UDJENZA: Għandek biex
jikkummentaw dwar kalligrafija tagħna?

927
00:51:56,050 --> 00:51:57,758
>> Professur: No, no, no
inkwiet dwar dik.

928
00:51:57,758 --> 00:51:58,440
Nru kummenti.

929
00:51:58,440 --> 00:51:59,400
Style għandha tkun tajba.

930
00:51:59,400 --> 00:52:01,470
Simili, ma Smush
kollox fuq linja waħda.

931
00:52:01,470 --> 00:52:04,580
Aħna mhux se jkunu kuntenti
miegħek jekk inti tagħmel dan.

932
00:52:04,580 --> 00:52:07,250
>> Hawn xi ħadd li tixtieq li
agħtini l-ewwel linja?

933
00:52:07,250 --> 00:52:08,633
Ħjiel, huwa faċli ħafna.

934
00:52:08,633 --> 00:52:09,320
>> Yeah?

935
00:52:09,320 --> 00:52:11,920
>> UDJENZA: Int, n ugwali żero.

936
00:52:11,920 --> 00:52:13,734
Just twaqqaf counter.

937
00:52:13,734 --> 00:52:15,900
Professur: Allura rridu xi
tip ta 'kontro, right?

938
00:52:15,900 --> 00:52:19,780
Jien biss se isem "għadd"
għall-fini ta leġibbiltà.

939
00:52:19,780 --> 00:52:21,265
What do irridu nistabbilixxu dan ugwali għal?

940
00:52:21,265 --> 00:52:21,890
>> UDJENZA: Zero.

941
00:52:21,890 --> 00:52:23,840
Professur: Yep.

942
00:52:23,840 --> 00:52:24,340
Virgola.

943
00:52:24,340 --> 00:52:26,250
Huwa wkoll semicolons tpinġija stramb ħafna.

944
00:52:26,250 --> 00:52:28,870
Just prattika tagħmel dan.

945
00:52:28,870 --> 00:52:31,990
>> Allura irridu li l-ewwel ikollhom
kontro tat int tip.

946
00:52:31,990 --> 00:52:35,360
Għaliex irridu li għadd up kif
karattri ħafna jew ittri huma

947
00:52:35,360 --> 00:52:36,780
f'dan string, id-dritt?

948
00:52:36,780 --> 00:52:38,330
Ewwel pass faċli ħafna.

949
00:52:38,330 --> 00:52:42,140
>> OK, forsi daqsxejn aktar kumplessa
issa, kif aħna se tagħmel dan?

950
00:52:42,140 --> 00:52:45,400
Hawn xi ħadd li tixtieq li
agħtini l-linja tal-kodiċi

951
00:52:45,400 --> 00:52:48,450
li tista 'tkun kapaċi tgħin lill loop
permezz ta 'kwalunkwe din hija?

952
00:52:48,450 --> 00:52:54,540

953
00:52:54,540 --> 00:52:56,900
>> Yeah, ruħ brave fid-dahar?

954
00:52:56,900 --> 00:53:06,832
>> UDJENZA: OK, hekk waqt punt
asterisks, il-istilla yeah ta 's,

955
00:53:06,832 --> 00:53:09,465
mhuwiex ugwali għal żero, allura jagħmel xi ħaġa?

956
00:53:09,465 --> 00:53:11,090
Professur: Li tassew, tassew qrib.

957
00:53:11,090 --> 00:53:11,835
Verament qrib.

958
00:53:11,835 --> 00:53:13,710
Hekk jien ser tindirizza
żewġ affarijiet ma 'dak.

959
00:53:13,710 --> 00:53:18,240
L-ewwelnett, mhuwiex eżattament żero.

960
00:53:18,240 --> 00:53:20,110
X'inhu dan?

961
00:53:20,110 --> 00:53:22,550
Hu l-terminatur null,
li huwa backslash żero.

962
00:53:22,550 --> 00:53:24,960
Allura jkunu differenti fil
f'termini ta 'kif dawn qed jinħażnu.

963
00:53:24,960 --> 00:53:26,270
Allura int verament qrib.

964
00:53:26,270 --> 00:53:30,330
>> U t-tieni, ma rridux
biss jċaqalqu l-pointer.

965
00:53:30,330 --> 00:53:32,320
Aħna rridu li attwalment
aċċess għall-valuri, id-dritt?

966
00:53:32,320 --> 00:53:34,050
U hekk kif nistgħu nagħmlu dan?

967
00:53:34,050 --> 00:53:34,550
Faċli ħafna.

968
00:53:34,550 --> 00:53:36,841
Ma naħsbux dwar pointers,
ma naħsbux dwar memorji.

969
00:53:36,841 --> 00:53:38,525
Mur lura għall ġimgħatejn ta 'dan il-kors.

970
00:53:38,525 --> 00:53:39,555
>> UDJENZA: [inaudible].

971
00:53:39,555 --> 00:53:40,680
Professur: Mill-, tiftakar?

972
00:53:40,680 --> 00:53:41,400
X'inhuma kordi?

973
00:53:41,400 --> 00:53:42,650
Kif huma maħżuna fil-memorja?

974
00:53:42,650 --> 00:53:43,300
>> UDJENZA: Huma qed jiżdied.

975
00:53:43,300 --> 00:53:43,810
>> Professur: domandi qed isiru.

976
00:53:43,810 --> 00:53:45,550
Allura kif nistgħu aċċess
kull karattru ġewwa?

977
00:53:45,550 --> 00:53:46,466
>> UDJENZA: [inaudible].

978
00:53:46,466 --> 00:53:47,530
Professur: Eżattament.

979
00:53:47,530 --> 00:53:53,195
Allura while-- dak li jmur ġewwa hawn?

980
00:53:53,195 --> 00:53:54,940
S tal -

981
00:53:54,940 --> 00:53:55,920
>> UDJENZA: I.

982
00:53:55,920 --> 00:53:58,216
>> Professur: Oh, i ma jeżistix, ma?

983
00:53:58,216 --> 00:53:59,620
>> UDJENZA: Oh, l-għadd?

984
00:53:59,620 --> 00:54:01,640
>> Professur: Nistgħu biss
użu għadd, ma tistax we?

985
00:54:01,640 --> 00:54:03,050
>> UDJENZA: Jiddispjacini, I sejħitilha i.

986
00:54:03,050 --> 00:54:04,341
>> Professur: Yeah, dan kollu tajjeb.

987
00:54:04,341 --> 00:54:06,710

988
00:54:06,710 --> 00:54:10,760
Għandna varjabbli up here li l-
diġà ġew iddikjarati bħala kontro tagħna.

989
00:54:10,760 --> 00:54:13,650
Allura għaliex ma aħna biss użu li
biex jimxu permezz tal-linja waqt?

990
00:54:13,650 --> 00:54:15,230
Does li jagħmel sens?

991
00:54:15,230 --> 00:54:20,864
>> Għalhekk, filwaqt li s ta count-- ma kull min jixtiequ
li tagħti me dak li jiġri wara hawn?

992
00:54:20,864 --> 00:54:22,030
UDJENZA: Ma ugwali.

993
00:54:22,030 --> 00:54:23,405
Professur: Ma ugwali, id-dritt?

994
00:54:23,405 --> 00:54:26,200
Huwa l-bang ugwali,
punt exclamation ugwali,

995
00:54:26,200 --> 00:54:28,500
tkun xi tkun guys tixtieq li
sejħa hija ma equal--

996
00:54:28,500 --> 00:54:29,496
>> UDJENZA: [inaudible].

997
00:54:29,496 --> 00:54:30,990
>> Professur: Yeah.

998
00:54:30,990 --> 00:54:37,110
Ftakar kwotazzjoni waħda hija għal char,
kwotazzjonijiet doppja huma għal string.

999
00:54:37,110 --> 00:54:38,630
Ikunu attenti meta jużawhom.

1000
00:54:38,630 --> 00:54:42,430
Allura meta aħna qed tfittex permezz
l-array, l-aħħar karattru,

1001
00:54:42,430 --> 00:54:46,420
nafu aħna ma rridux
li jkun backslash żero.

1002
00:54:46,420 --> 00:54:47,340
>> Allura waqt.

1003
00:54:47,340 --> 00:54:48,840
Aħna mhux fl-aħħar tas-sekwenza.

1004
00:54:48,840 --> 00:54:52,335
What do rridu nagħmlu minn ġewwa?

1005
00:54:52,335 --> 00:54:55,269
>> UDJENZA: Irridu li żżid mal-
counter u għalhekk jgħodd plus plus?

1006
00:54:55,269 --> 00:54:56,060
Professur: Eżattament.

1007
00:54:56,060 --> 00:55:03,064
Allura hawnhekk aħna qed tmur biex tagħmel
għadd, għadd plus plus.

1008
00:55:03,064 --> 00:55:03,980
Nieqsa linja waħda aktar.

1009
00:55:03,980 --> 00:55:05,090
Aħna kważi hemm.

1010
00:55:05,090 --> 00:55:07,398
Liema huma aħna jinsa li tagħmel?

1011
00:55:07,398 --> 00:55:08,770
>> UDJENZA: Jirritornaw żero?

1012
00:55:08,770 --> 00:55:10,820
>> Professur: Inti tixtieq li jirritornaw żero?

1013
00:55:10,820 --> 00:55:12,962
>> UDJENZA: Le, jirritornaw lejn strlen.

1014
00:55:12,962 --> 00:55:13,511
Stenna.

1015
00:55:13,511 --> 00:55:14,760
Professur: Liema hija maħżuna fil-?

1016
00:55:14,760 --> 00:55:15,090
UDJENZA: Count.

1017
00:55:15,090 --> 00:55:15,589
Count.

1018
00:55:15,589 --> 00:55:17,150
Professur: Eżattament.

1019
00:55:17,150 --> 00:55:20,760
Allura hawnhekk aħna qed tmur biex jirritornaw għadd.

1020
00:55:20,760 --> 00:55:23,450

1021
00:55:23,450 --> 00:55:25,380
>> Minħabba dak li aħna qed
tagħmel hawn ultimately--

1022
00:55:25,380 --> 00:55:29,780
għandna varjabbli counter li l-
ser inkrement permezz string tagħna.

1023
00:55:29,780 --> 00:55:33,050
Aħna qed tmur biex jibqgħu għaddejjin, iżommu
għaddejjin, madwar u madwar f'dan loop.

1024
00:55:33,050 --> 00:55:37,700
U filwaqt li aħna mhux qed fuq it-tmiem ta 'dan
spag, li hija l-terminatur null.

1025
00:55:37,700 --> 00:55:40,410
>> U kull darba immorru permezz
dan, aħna qed żżid li jużaw tagħna.

1026
00:55:40,410 --> 00:55:42,640
U aħna qed tmur aktar
flimkien f'dan array.

1027
00:55:42,640 --> 00:55:44,880
U fl-aħħar, ladarba aħna
laqat il-terminatur null,

1028
00:55:44,880 --> 00:55:48,469
nafu, oh, nistgħu
break, jirritorna l-għadd.

1029
00:55:48,469 --> 00:55:49,260
Għandna strlen tagħna.

1030
00:55:49,260 --> 00:55:52,280

1031
00:55:52,280 --> 00:55:56,400
>> Ma kulħadd nikseb kif
dan kien implimentat?

1032
00:55:56,400 --> 00:55:58,830
Filwaqt loops-- Naf aħna ma
isir wisq magħhom,

1033
00:55:58,830 --> 00:56:01,240
iżda dawn qed normalment
ħafna, utli ħafna jekk inti

1034
00:56:01,240 --> 00:56:05,390
ma nafx dak li qed waqfien
kundizzjoni neċessarjament għandu jkun.

1035
00:56:05,390 --> 00:56:06,220
>> Mistoqsija?

1036
00:56:06,220 --> 00:56:10,080
>> UDJENZA: Nistgħu tikteb null
fuq il-kondizzjoni filwaqt?

1037
00:56:10,080 --> 00:56:10,940
>> Professur: Filwaqt?

1038
00:56:10,940 --> 00:56:15,304
Yeah, hekk din il-problema kelli inti
guys jassumi li s mhux se jkun null.

1039
00:56:15,304 --> 00:56:17,220
Minħabba ftakar,
teoretikament, jekk jiena ħadt

1040
00:56:17,220 --> 00:56:21,180
a pointer li kien tant kbir ta 'memorja,
dan jagħti inti l-null, id-dritt?

1041
00:56:21,180 --> 00:56:23,770
Dak hu l-funzjonament
sistema ser jagħmlu.

1042
00:56:23,770 --> 00:56:26,960
>> Mela jekk jien ma jgħidlek li wieħed jassumi
s kienu jkunu nulli, ikollok bżonn li jiċċekkja.

1043
00:56:26,960 --> 00:56:32,050
Allura up hawn, inti se tagħmel, jekk s
ugwali ugwali null, ritorn wieħed.

1044
00:56:32,050 --> 00:56:33,028
Xi haga hekk.

1045
00:56:33,028 --> 00:56:34,153
UDJENZA: [inaudible] żero.

1046
00:56:34,153 --> 00:56:37,287

1047
00:56:37,287 --> 00:56:39,370
Professur: OK, I ser jgħidlek
inti għaliex aħna ma tistax tagħmel dan.

1048
00:56:39,370 --> 00:56:43,357
Minħabba ftakar fil-memorja, lemin, hawn.

1049
00:56:43,357 --> 00:56:43,940
Aħna ser imorru hawn.

1050
00:56:43,940 --> 00:56:49,940

1051
00:56:49,940 --> 00:56:54,090
>> You ħadthom ltqajna blokki ġgant
tal-memorja kollu ma grids

1052
00:56:54,090 --> 00:56:56,680
li taħżen valuri differenti, id-dritt?

1053
00:56:56,680 --> 00:57:00,110
U għalhekk kull string is-- għall
eżempju, jekk irridu li l-input hello,

1054
00:57:00,110 --> 00:57:05,490
ikun H-E-L-L-O
backslash żero, id-dritt?

1055
00:57:05,490 --> 00:57:09,570
U mbagħad li jaf, bħal każwali
affarijiet li huma fil hawn wara.

1056
00:57:09,570 --> 00:57:11,220
>> Aħna ma attwalment jafu x'hemm hemmhekk.

1057
00:57:11,220 --> 00:57:13,350
U hekk jekk ġejt biex tagħmel
minflok backslash żero,

1058
00:57:13,350 --> 00:57:15,590
null, jista 'ma jkunx null.

1059
00:57:15,590 --> 00:57:17,680
Minħabba li biss tista 'tfisser
xi affarijiet oħra bl-addoċċ

1060
00:57:17,680 --> 00:57:19,270
li ma jappartjenux fil string tiegħek.

1061
00:57:19,270 --> 00:57:23,219
U għalhekk l-mod li aħna dejjem nafu li
string truf huwa ma 'backslash żero.

1062
00:57:23,219 --> 00:57:25,760
U hekk dan huwa kif aħna dejjem
tikkontrolla biex tara l-aħħar ta 'sekwenza.

1063
00:57:25,760 --> 00:57:30,820
>> Null, dak kollu li mezzi huwa jekk għandek
pointer ineżistenti, qabel kollox,

1064
00:57:30,820 --> 00:57:36,160
jew jekk memorja tiegħek huwa biss hekk kbir li
inti ma tista 'tibagħtu lura, allura d jkun null.

1065
00:57:36,160 --> 00:57:40,150
Sabiex ikunu attenti ħafna meta ssir differenza
id-differenza bejn null

1066
00:57:40,150 --> 00:57:42,130
u l-backslash żero.

1067
00:57:42,130 --> 00:57:43,670
Yeah.

1068
00:57:43,670 --> 00:57:46,886
>> Kulhadd OK ma 'dan?

1069
00:57:46,886 --> 00:57:48,150
KOLLOX SEW.

1070
00:57:48,150 --> 00:57:50,440
>> So I kellha inti guys jiktbu strlen.

1071
00:57:50,440 --> 00:57:53,790
Possibbilment nistgħu wkoll titlob tikteb
out A sa I, ftakar li "Atwoa"

1072
00:57:53,790 --> 00:57:55,400
jew kwalunkwe inti guys tixtieq li hija sejħa?

1073
00:57:55,400 --> 00:57:58,010
Dik il-funzjoni fil
Vigenere u Caesar, li

1074
00:57:58,010 --> 00:58:00,900
tikkonverti valur ASCII għal integer?

1075
00:58:00,900 --> 00:58:04,360
Li wkoll għandha toħroġ fuq kwizzijiet passat
tal-funzjonijiet konna mitluba li inti tikteb.

1076
00:58:04,360 --> 00:58:08,280
>> Pretty ħafna xi funzjoni
li inti stajt użat u hija

1077
00:58:08,280 --> 00:58:11,660
faċli ħafna li tikteb lilek innifsek,
sensors simili huwa iktar baxx,

1078
00:58:11,660 --> 00:58:14,620
huwa fuq, biex ibaxxu, li fuq.

1079
00:58:14,620 --> 00:58:17,964
Funzjonijiet li jikkonverti
string minn zghar li uppercase.

1080
00:58:17,964 --> 00:58:19,380
Aħna lkoll nafu kif għandek tagħmel dan, id-dritt?

1081
00:58:19,380 --> 00:58:21,100
Huwa pjuttost faċli.

1082
00:58:21,100 --> 00:58:24,770
Biss jixtiequ jagħmlu ċert li inti
can-- huwa l-istess proċess tal-ħsieb.

1083
00:58:24,770 --> 00:58:26,940
Inti biss jtenni permezz
u iddawwar l-affarijiet.

1084
00:58:26,940 --> 00:58:30,190
Inti jew għadd jew meta
iddawwar affarijiet differenti.

1085
00:58:30,190 --> 00:58:32,280
>> Nixtieq suggest-- I
ma nafx jekk aħna qed tmur

1086
00:58:32,280 --> 00:58:39,080
li jistaqsuk li jimmemorizza dak kapital A jew
Z kapital, jew zghar A jew zghar

1087
00:58:39,080 --> 00:58:42,640
z huma ASCII, imma nissuġġerixxi
forsi miktub li fil-każ li

1088
00:58:42,640 --> 00:58:44,124
nagħmlu.

1089
00:58:44,124 --> 00:58:45,540
Just hekk inti guys jkollhom referenza.

1090
00:58:45,540 --> 00:58:47,180
Like uppercase A hija, dak li, 197?

1091
00:58:47,180 --> 00:58:51,320
U allura zghar huwa simili 50 xi ħaġa.

1092
00:58:51,320 --> 00:58:52,492
65, yeah, hemm inti tmur.

1093
00:58:52,492 --> 00:58:54,950
Hekk biss pretty ħafna jafu l-
differenza bejniethom hija 32.

1094
00:58:54,950 --> 00:58:57,670
Li pretty importanti.

1095
00:58:57,670 --> 00:58:58,170
Yeah.

1096
00:58:58,170 --> 00:59:01,445
Am I tajba fuq dan?

1097
00:59:01,445 --> 00:59:01,945
KOLLOX SEW.

1098
00:59:01,945 --> 00:59:03,109
>> UDJENZA: Nistgħu
teoretikament jikteb xi

1099
00:59:03,109 --> 00:59:04,410
minn dawn l isfel kif ukoll fuq little-- tagħna

1100
00:59:04,410 --> 00:59:07,035
>> Professur: You teoretikament
tista 'biss kopja tal-funzjoni isfel.

1101
00:59:07,035 --> 00:59:08,482
Veru.

1102
00:59:08,482 --> 00:59:11,080
>> UDJENZA: Mhux [inaudible].

1103
00:59:11,080 --> 00:59:12,720
>> Professur: You guys ikollhom folja.

1104
00:59:12,720 --> 00:59:14,194
Inti guys folja nota.

1105
00:59:14,194 --> 00:59:14,860
Tista 'tip fiha.

1106
00:59:14,860 --> 00:59:15,490
Tista 'tikteb.

1107
00:59:15,490 --> 00:59:17,031
Tista 'tagħmel dak kollu li tixtieq magħha.

1108
00:59:17,031 --> 00:59:18,530
Yeah.

1109
00:59:18,530 --> 00:59:21,406
Allura teoretikament, jekk
inti tixtieq li, tmur għall.

1110
00:59:21,406 --> 00:59:23,338
>> UDJENZA: [inaudible]
iżda aħna ma verament

1111
00:59:23,338 --> 00:59:25,994
neċessarjament bżonn li wieħed jiftakar
il-valur, nistgħu biss

1112
00:59:25,994 --> 00:59:28,914
jużaw il-li fuq jew li
funzjonali iżjed baxx, id-dritt?

1113
00:59:28,914 --> 00:59:29,580
Professur: Yeah.

1114
00:59:29,580 --> 00:59:32,740
Imma jekk aħna taw inti xi mistoqsija
li tgħid jikteb lill fuq,

1115
00:59:32,740 --> 00:59:34,350
allura għandek bżonn biex tiktibha.

1116
00:59:34,350 --> 00:59:38,150
Allura inti guys tista 'tassumi li inti
guys jkollhom aċċess għall-funzjonijiet kollha,

1117
00:59:38,150 --> 00:59:41,523
imma jekk inti tixtieq li tuża biex fuq jew li
inqas, dak li għandek ukoll tagħmel?

1118
00:59:41,523 --> 00:59:43,840
>> UDJENZA: [inaudible]
użu CS50 [inaudible]

1119
00:59:43,840 --> 00:59:44,840
>> Professur: Huwa CS50.h?

1120
00:59:44,840 --> 00:59:47,320

1121
00:59:47,320 --> 00:59:48,310
Oqgħod attent hemmhekk.

1122
00:59:48,310 --> 00:59:50,640
>> Allura biex fuq, biex ibaxxu,
huwa fuq, hija aktar baxxa,

1123
00:59:50,640 --> 00:59:52,990
funzjonijiet li jinvolvu
manipulazzjoni string huma

1124
00:59:52,990 --> 00:59:55,490
kollha fi ħdan jew l ascii
jew fil-librerija matematika

1125
00:59:55,490 --> 00:59:57,350
jew fil-librerija sekwenza.

1126
00:59:57,350 --> 01:00:00,290
Mela jekk inti guys jużaw dawk
funzjonijiet, ikunu attenti biex tiftakar

1127
01:00:00,290 --> 01:00:01,451
li jinkludi dak header.

1128
01:00:01,451 --> 01:00:03,950
Allura forsi wkoll xi ħaġa inti
tixtieq li tinkludi fil-karta tiegħek,

1129
01:00:03,950 --> 01:00:04,892
liema huma l-header?

1130
01:00:04,892 --> 01:00:06,600
X'inhuma l-libreriji
inti kont qed tuża?

1131
01:00:06,600 --> 01:00:08,550
Liema funzjonijiet huma
ġewwa dawk libreriji?

1132
01:00:08,550 --> 01:00:09,230
Huwa importanti.

1133
01:00:09,230 --> 01:00:10,420
>> Yeah?

1134
01:00:10,420 --> 01:00:12,570
>> UDJENZA: Jista aħna biss
COP out u jagħmlu hashtag

1135
01:00:12,570 --> 01:00:14,955
permezz tal-assolutament
kull ittra konna qatt

1136
01:00:14,955 --> 01:00:17,340
jidhru simili fuq il-mistoqsijiet?

1137
01:00:17,340 --> 01:00:18,320
>> Professur: Inti tista.

1138
01:00:18,320 --> 01:00:20,361
I do not know kif kuntenti
aħna qed tmur biex tkun għall-grad

1139
01:00:20,361 --> 01:00:25,090
li kwizz meta kull biċċa tal-kodiċi
huwa darbtejn sakemm jeħtieġ li jkun.

1140
01:00:25,090 --> 01:00:27,200
I do not know, nistgħu
tluq punt għall-istil.

1141
01:00:27,200 --> 01:00:28,790
Iżda teoretikament tiegħek
kodiċi ikun ġust.

1142
01:00:28,790 --> 01:00:30,915
You guys tista COP out u
biss jinkludu kollox.

1143
01:00:30,915 --> 01:00:32,044
Li l-multa wisq, yeah.

1144
01:00:32,044 --> 01:00:32,960
UDJENZA: [inaudible].

1145
01:00:32,960 --> 01:00:33,270
Professur: Yeah.

1146
01:00:33,270 --> 01:00:34,900
Nissuġġerixxi ma tagħmel dan għalkemm.

1147
01:00:34,900 --> 01:00:35,505
Yeah.

1148
01:00:35,505 --> 01:00:36,130
UDJENZA: Kessaħ.

1149
01:00:36,130 --> 01:00:36,620
Professur: Tajba kwistjoni.

1150
01:00:36,620 --> 01:00:37,480
UDJENZA: Allura, l-agħar każ.

1151
01:00:37,480 --> 01:00:38,563
Professur: L-agħar każ.

1152
01:00:38,563 --> 01:00:40,350
Jekk inti totalment tinsa,
inti tista 'tagħmel dan.

1153
01:00:40,350 --> 01:00:40,850
Yeah.

1154
01:00:40,850 --> 01:00:43,870

1155
01:00:43,870 --> 01:00:45,400
>> Yep, kodiċi huwa hemm dritt.

1156
01:00:45,400 --> 01:00:49,176
I użati n minflok għadd imma, int
jafu, tkun xi tkun sufruni dgħajsa tiegħek.

1157
01:00:49,176 --> 01:00:51,092
UDJENZA: Stenna, hekk aħna
ma jkollhomx hashtag

1158
01:00:51,092 --> 01:00:53,460
jinkludu għaliex aħna qed
li jibda mid-int?

1159
01:00:53,460 --> 01:00:56,150

1160
01:00:56,150 --> 01:00:59,924
>> Professur: Yeah, I biss jassumi li
konna mitluba biex jiktbu l-funzjoni.

1161
01:00:59,924 --> 01:01:02,340
Jekk inti ried li jkun sikur, inti
probabbilment tista 'tqiegħed hemmhekk.

1162
01:01:02,340 --> 01:01:05,650
Imma I biss ma jolqot, yeah.

1163
01:01:05,650 --> 01:01:09,919
>> I lanqas biss jafu jekk inti
bżonn xi librerija għal dan.

1164
01:01:09,919 --> 01:01:12,710
Għax int ma verament istampar
xejn barra jew xejn, id-dritt?

1165
01:01:12,710 --> 01:01:16,500

1166
01:01:16,500 --> 01:01:19,568
Yeah, I do not know jekk
għandek bżonn librerija.

1167
01:01:19,568 --> 01:01:22,400
>> KOLLOX SEW.

1168
01:01:22,400 --> 01:01:26,020
Dan huwa wkoll daqsxejn aktar flimkien
il-linji ta 'manipulazzjoni memorja.

1169
01:01:26,020 --> 01:01:27,400
Dan it-tip ta 'kemmxejn delikata.

1170
01:01:27,400 --> 01:01:28,960
Aħseb dwar dan.

1171
01:01:28,960 --> 01:01:30,580
Inti għandek funzjoni msejħa funzjonijiet.

1172
01:01:30,580 --> 01:01:33,570
I setgħet imsemmija hija tkun xi tkun,
imma I jagħżlu li isem li bih funzjonijiet.

1173
01:01:33,570 --> 01:01:36,000
I jkollhom dan hawn fuq prinċipali tiegħi.

1174
01:01:36,000 --> 01:01:39,790
Ftakar, inti tixtieq li jkollok
funzjoni wara ewlenija tiegħek,

1175
01:01:39,790 --> 01:01:42,370
inti tixtieq li tagħmel żgur li int
jinkludu l-prototip tal-quċċata.

1176
01:01:42,370 --> 01:01:45,750
>> Iżda f'dan il-każ kienet daqshekk qasir
I felt I tista 'biss

1177
01:01:45,750 --> 01:01:47,260
tinkludih atop l-prinċipali.

1178
01:01:47,260 --> 01:01:51,170
I ma kellhomx bżonn li jkollhom l-prototip,
għaliex dan huwa diġà bil-miktub aktar 'il fuq.

1179
01:01:51,170 --> 01:01:55,430
Allura kull nagħmel fil-funzjoni prinċipali tiegħi
qed toħloq numru sħiħ x ugwali għal 10.

1180
01:01:55,430 --> 01:02:00,490
Jien ssejjaħ il-funzjoni funzjonijiet tiegħi,
u mbagħad istampar up xi ħaġa.

1181
01:02:00,490 --> 01:02:02,840
>> U allura li attwalment
dak funzjonijiet qed tagħmel.

1182
01:02:02,840 --> 01:02:04,340
Inti guys tixtieq li jaħsbu permezz ta 'dan.

1183
01:02:04,340 --> 01:02:05,423
Għaliex dan huwa daqsxejn delikata.

1184
01:02:05,423 --> 01:02:07,220
Huwa ħafna, ferm delikata, fil-fatt.

1185
01:02:07,220 --> 01:02:09,549
Jaħsbu permezz dak li dan
programm ikun outputting.

1186
01:02:09,549 --> 01:02:10,840
I ser jagħtuk guys żewġ minuti.

1187
01:02:10,840 --> 01:03:36,660

1188
01:03:36,660 --> 01:03:37,891
>> Diskussjonijiet Tajba?

1189
01:03:37,891 --> 01:03:38,853
>> UDJENZA: Yeah.

1190
01:03:38,853 --> 01:03:39,815
>> Professur: Yeah.

1191
01:03:39,815 --> 01:03:42,220
Kull dritt, għalhekk dan huwa
delikata għal raġuni.

1192
01:03:42,220 --> 01:03:44,845
U dan huwa għaliex I riedu
dan għall-attenzjoni ta 'kulħadd.

1193
01:03:44,845 --> 01:03:47,870

1194
01:03:47,870 --> 01:03:51,147
Hawn xi ħadd li tixtieq li tagħti me
suġġeriment, tentattiv?

1195
01:03:51,147 --> 01:03:52,230
X'għandu dan jistampa?

1196
01:03:52,230 --> 01:03:53,930
Totalment multa jekk int żbaljat.

1197
01:03:53,930 --> 01:03:55,619
Yeah?

1198
01:03:55,619 --> 01:03:59,483
>> UDJENZA: Naħseb li huwa 100 u
imbagħad 10 fuq żewġ linji separati.

1199
01:03:59,483 --> 01:04:00,940
>> Professur: U 10?

1200
01:04:00,940 --> 01:04:03,154
Ħadd ma jkollu xi guesses oħra?

1201
01:04:03,154 --> 01:04:04,150
Yeah?

1202
01:04:04,150 --> 01:04:09,040
>> UDJENZA: Forsi biss 10 minħabba
funzjonijiet mhix jirritornaw xejn?

1203
01:04:09,040 --> 01:04:11,610
>> Professur: OK, hekk aħna
jkollhom raden numru wieħed

1204
01:04:11,610 --> 01:04:14,990
huwa dak in-numru raden tnejn huwa
biss ser jistampa 10.

1205
01:04:14,990 --> 01:04:17,623
Ħadd ma jkollu xi guesses oħra?

1206
01:04:17,623 --> 01:04:19,654
KOLLOX SEW.

1207
01:04:19,654 --> 01:04:21,070
Mela ejja jimxu permezz ta 'dan, id-dritt?

1208
01:04:21,070 --> 01:04:23,903
Kull meta inti tikseb biċċa ta 'kodiċi,
ma biss tħares lejn din u jkun simili,

1209
01:04:23,903 --> 01:04:25,060
ah, dan huwa Jittieħed tant!

1210
01:04:25,060 --> 01:04:26,460
Jien hekk konfuż!

1211
01:04:26,460 --> 01:04:28,220
Bħal, kalm lilek innifsek isfel.

1212
01:04:28,220 --> 01:04:31,602
Biss jafu li inti tista 'biss
tfittex permezz-kodiċi linja b'linja.

1213
01:04:31,602 --> 01:04:32,310
Li kollox huwa.

1214
01:04:32,310 --> 01:04:33,840
Huwa simili qari ktieb.

1215
01:04:33,840 --> 01:04:38,000
>> Allura ma 'kull funzjoni,
aħna dejjem tibda fil prinċipali.

1216
01:04:38,000 --> 01:04:40,860
Allura aħna qed tmur biex
tibda fil null prinċipali int,

1217
01:04:40,860 --> 01:04:43,010
anke l-programm ta
diġà jinżlu, id-dritt?

1218
01:04:43,010 --> 01:04:45,070
Ibda fl fl null prinċipali.

1219
01:04:45,070 --> 01:04:48,030
Int x ugwali għal 10.

1220
01:04:48,030 --> 01:04:50,400
>> So I m ser iħassar din.

1221
01:04:50,400 --> 01:04:55,179

1222
01:04:55,179 --> 01:04:58,470
Jien ser tiġbed l-memorja biss sabiex inti
guys tista tip ta 'tara x'inhu jiġri.

1223
01:04:58,470 --> 01:05:02,190
>> Ftakar stabbiliti hawn għandna munzell tagħna?

1224
01:05:02,190 --> 01:05:05,810
Up hawnhekk għandna tagħna
borġ x'imkien up here.

1225
01:05:05,810 --> 01:05:07,470
Munzell jikbru, id-dritt?

1226
01:05:07,470 --> 01:05:10,150
U fil-munzell, inti għandek
l mains jiffunzjonaw kif ukoll

1227
01:05:10,150 --> 01:05:12,230
kollha ta 'varjabbli lokali mains.

1228
01:05:12,230 --> 01:05:14,310
>> Allura hawnhekk, int x indaqs għall-10.

1229
01:05:14,310 --> 01:05:17,670
Fi ħdan funzjoni ewlenija tagħna aħna qed
ħolqien ta 'varjabbli imsejjaħ x.

1230
01:05:17,670 --> 01:05:20,590
Aħna qed jistabbilixxu li daqs 10.

1231
01:05:20,590 --> 01:05:24,200
Hawnhekk inti stajt ltqajna xi x, u int
stabbilita din ugwali għal 10, id-dritt,

1232
01:05:24,200 --> 01:05:25,400
fi ħdan prinċipali.

1233
01:05:25,400 --> 01:05:27,430
Kulħadd tajba?

1234
01:05:27,430 --> 01:05:28,070
>> Funzjoni.

1235
01:05:28,070 --> 01:05:30,330
Allura issa, ġewwa prinċipali tagħna
funzjoni, aħna qed ssejjaħ

1236
01:05:30,330 --> 01:05:31,810
il-funzjoni konna bil-miktub aktar 'il fuq.

1237
01:05:31,810 --> 01:05:34,550
Allura aħna qed issa jidħol it-tieni funzjoni.

1238
01:05:34,550 --> 01:05:40,120
Aħna qed tmur biex joħolqu ieħor
int varjabbli x hija ugwali għal 100.

1239
01:05:40,120 --> 01:05:42,410
Dak li qed jiġri hawn fuq il-munzell?

1240
01:05:42,410 --> 01:05:46,980
X'jiġri meta inti sejħa
funzjoni li toħloq varjabbli ġodda?

1241
01:05:46,980 --> 01:05:50,038
X'jiġri hawn fuq il-munzell?

1242
01:05:50,038 --> 01:05:52,134
>> UDJENZA: [inaudible] piles fuq nett?

1243
01:05:52,134 --> 01:05:52,800
Professur: Yeah.

1244
01:05:52,800 --> 01:05:54,050
Allura fil-fatt joħloq kopja.

1245
01:05:54,050 --> 01:05:56,560

1246
01:05:56,560 --> 01:05:57,740
U tip ta 'munzelli fuq nett.

1247
01:05:57,740 --> 01:06:00,700
Aħsbu fil-stack-- 'ċumnija
ta 'kotba, munzell ta' xejn.

1248
01:06:00,700 --> 01:06:06,520
Munzelli fuq nett, l-ewwel fl-aħħar
out,-aħħar fl-ewwel li joħroġ.

1249
01:06:06,520 --> 01:06:08,471
>> Allura li għaddej biex jinħoloq x hawn.

1250
01:06:08,471 --> 01:06:12,080

1251
01:06:12,080 --> 01:06:14,450
>> Li għaddej biex ikollhom
varjabbli funcs kollha.

1252
01:06:14,450 --> 01:06:14,950
Great.

1253
01:06:14,950 --> 01:06:20,980
Allura issa għandna żewġ X differenti li
jirrappreżentaw żewġ affarijiet differenti ħafna.

1254
01:06:20,980 --> 01:06:24,470
Allura aħna qed tmur biex jistampaw
l-eqreb numru sħiħ ta 'x.

1255
01:06:24,470 --> 01:06:26,430
Mela ejja jistampaw 100, id-dritt?

1256
01:06:26,430 --> 01:06:29,389
Għaliex hawnhekk huwa 100.

1257
01:06:29,389 --> 01:06:31,680
Allura dak hu l-ewwel ħaġa
li huwa għaddej biex jistampa.

1258
01:06:31,680 --> 01:06:35,710
Peress li din xejn prospetti funzjoni,
issa dik il-funzjoni, din il-linja fil ewlenija

1259
01:06:35,710 --> 01:06:37,070
isir.

1260
01:06:37,070 --> 01:06:39,160
Kulhadd tajba miegħi s'issa?

1261
01:06:39,160 --> 01:06:43,034
>> Allura aħna qed issa permezz tnejn mill-
tliet linji ta 'funzjoni ewlenija tagħna.

1262
01:06:43,034 --> 01:06:44,450
Issa aħna qed tmur għat-tielet linja.

1263
01:06:44,450 --> 01:06:46,350
Aħna qed tmur biex printf.

1264
01:06:46,350 --> 01:06:48,222
X'inhu dan x ġewwa prinċipali?

1265
01:06:48,222 --> 01:06:49,263
Xi jfisser li jirrappreżenta?

1266
01:06:49,263 --> 01:06:52,720

1267
01:06:52,720 --> 01:06:54,280
>> X'inhu valur huwa x issa?

1268
01:06:54,280 --> 01:06:55,220
>> UDJENZA: 100.

1269
01:06:55,220 --> 01:06:56,799
>> Professur: Huwa 100?

1270
01:06:56,799 --> 01:06:57,590
UDJENZA: Still 10.

1271
01:06:57,590 --> 01:06:58,878
Professur: Still 10.

1272
01:06:58,878 --> 01:07:00,870
Yeah.

1273
01:07:00,870 --> 01:07:06,810
Minħabba ftakar, fi ħdan
funzjonijiet tagħna, x hija ugwali għal 100.

1274
01:07:06,810 --> 01:07:09,690
Imma jekk nerġgħu lura lura
il-funzjoni ewlenija tagħna,

1275
01:07:09,690 --> 01:07:12,440
dak il-varjabbli hija maħżuna fil-
f'post differenti fuq munzell tagħna.

1276
01:07:12,440 --> 01:07:16,250
>> Allura issa għandna bżonn li jmorru lura għall-
munzell prinċipali, mejns varjabbli lokali.

1277
01:07:16,250 --> 01:07:18,460
U hawn x hija ugwali għal 10.

1278
01:07:18,460 --> 01:07:20,300
U hekk aħna qed tmur biex jistampa 10.

1279
01:07:20,300 --> 01:07:22,530
>> Hekk hi kienet assolutament dritt.

1280
01:07:22,530 --> 01:07:25,053
Aħna ser ikollhom l-
output ta '100 u 10.

1281
01:07:25,053 --> 01:07:25,553
Yeah?

1282
01:07:25,553 --> 01:07:28,700
UDJENZA: Meta inti malloc, huwa l-
borġ jew iċ-munzell li huwa [inaudible]?

1283
01:07:28,700 --> 01:07:31,950
Professur: Meta inti malloc,
tkun qed tieħu memorja mill-munzell

1284
01:07:31,950 --> 01:07:32,830
u allokazzjoni tiegħu.

1285
01:07:32,830 --> 01:07:34,950
Sabiex inti ma għandekx
li mess ma 'kwalunkwe minn dan.

1286
01:07:34,950 --> 01:07:38,100
So I raden l-takeaway akbar
hawnhekk hija xi ħaġa imsejħa ambitu.

1287
01:07:38,100 --> 01:07:39,650
>> Għal dawk minnkom li kienu fil
is-sessjoni reviżjoni aħħar lejl,

1288
01:07:39,650 --> 01:07:41,080
tkellimna fil-qosor dwar dan.

1289
01:07:41,080 --> 01:07:45,380
Skop jiddefinixxi kif u
meta jeżistu varjabbli tiegħek.

1290
01:07:45,380 --> 01:07:48,050
Jew fi ħdan dak frejms
jeżistu varjabbli tiegħek.

1291
01:07:48,050 --> 01:07:51,690
>> Pretty ħafna l-istat tad-thumb ġeneralment
huwa, variables-- tiegħek jekk inti jinħolqu minnhom

1292
01:07:51,690 --> 01:07:56,660
ġewwa kaboċċi braces-- jeżistu
biss ġewwa dawk ċineg kaboċċi.

1293
01:07:56,660 --> 01:08:00,312
>> Għalhekk, per eżempju fil-funzjoni tagħna ta '
funzjonijiet, tara dawn iż-żewġ ċineg.

1294
01:08:00,312 --> 01:08:02,020
Jekk int ħolqien
xejn ġewwa ta 'dan,

1295
01:08:02,020 --> 01:08:06,500
ċansijiet huma kull ma għandek tagħmel huwa qed
ħolqien ta 'munzell u ħażna li hemm.

1296
01:08:06,500 --> 01:08:07,430
L-istess ħaġa fil prinċipali.

1297
01:08:07,430 --> 01:08:09,950
Li jinsab biss maħżuna ġewwa tal ewlenija.

1298
01:08:09,950 --> 01:08:13,560
>> Ukoll inti tixtieq li tkun
ħafna, ferm attent hawn.

1299
01:08:13,560 --> 01:08:18,310
Għax l-ambitu tagħti wkoll
ruħha li eżempji differenti.

1300
01:08:18,310 --> 01:08:25,950
Għalhekk, per eżempju a għal
loop, għal int i ugwali 0.

1301
01:08:25,950 --> 01:08:28,460
I hija inqas minn, I do not know, 10.

1302
01:08:28,460 --> 01:08:32,111
I plus plus.

1303
01:08:32,111 --> 01:08:34,560
U inti stajt ltqajna kodiċi ġewwa ta 'dan, id-dritt?

1304
01:08:34,560 --> 01:08:38,830
>> Fejn ma dan il-varjabbli,
i, attwalment jeżistu biss?

1305
01:08:38,830 --> 01:08:40,510
Biss ġewwa tal tiegħek għall loop.

1306
01:08:40,510 --> 01:08:43,640
So I bet ħafna minnkom guys
probabbilment jiltaqgħu magħhom dan l-iżball meta

1307
01:08:43,640 --> 01:08:45,930
li qed isir programmi psets tiegħek.

1308
01:08:45,930 --> 01:08:49,990
Kemm inti guys ppruvaw jużaw i
barra minn għal loop u kellhom żball?

1309
01:08:49,990 --> 01:08:53,310
Bħal interi unreferenced
jew xi ħaġa bħal dik?

1310
01:08:53,310 --> 01:08:56,069
>> Ir-raġuni għaliex dan jiġri
huwa għaliex hawnhekk int

1311
01:08:56,069 --> 01:08:59,109
joħolqu xi ħaġa li biss
teżisti fi ħdan tiegħek għall loop.

1312
01:08:59,109 --> 01:09:01,972
U jekk inti tipprova tagħmel użu minnha, i ma
fil-fatt jeżistu barra minnha.

1313
01:09:01,972 --> 01:09:04,930
Allura bażikament kompjuter qal, I
ma nafx dak li qed jitkellem dwar.

1314
01:09:04,930 --> 01:09:08,689
All I know huwa li kien i
hawn, iżda issa m'għadhomx.

1315
01:09:08,689 --> 01:09:12,580
>> Mela jekk jien kienu li joħolqu
għall loop ġewwa, right?

1316
01:09:12,580 --> 01:09:19,080
U jien ser joħolqu ieħor,
bħal int j, u li hija tagħmel dak kollu.

1317
01:09:19,080 --> 01:09:23,689
U inti għandek kodiċi ġewwa tal
li loop, j teżisti biss hawn.

1318
01:09:23,689 --> 01:09:26,029
Iżda li teżisti wkoll fi ħdan i.

1319
01:09:26,029 --> 01:09:29,310
U hekk j jeżisti biss
fi ħdan dan għal loop,

1320
01:09:29,310 --> 01:09:33,850
billi i teżisti fil-ħaġa sħiħa.

1321
01:09:33,850 --> 01:09:34,500
>> Kulħadd ċara?

1322
01:09:34,500 --> 01:09:37,416
L-istess ħaġa ma 'dikjarazzjonijiet kondizzjonali
jekk inti tixtieq li toħloq xejn.

1323
01:09:37,416 --> 01:09:40,390
L-istess ħaġa ma 'linji waqt jekk
tixtieq toħloq xejn.

1324
01:09:40,390 --> 01:09:42,390
Dik xi ħaġa li tkun
ħafna, attenti ħafna dwar.

1325
01:09:42,390 --> 01:09:45,681
Għalhekk din kienet problema verament tajba fil-
sens li wera żewġ affarijiet.

1326
01:09:45,681 --> 01:09:47,160
Wera ewwel, l-iskop.

1327
01:09:47,160 --> 01:09:49,550
U wera
wkoll għall-allokazzjoni memorja.

1328
01:09:49,550 --> 01:09:54,130
Għaliex inti guys tkun taf li
funzjonijiet jikbru fuq fid-munzell.

1329
01:09:54,130 --> 01:09:56,710
U li meta inti sejħa
funzjonijiet, int ħolqien

1330
01:09:56,710 --> 01:09:59,060
essenzjalment munzell ġdid ta 'memorja.

1331
01:09:59,060 --> 01:10:02,100
Dan huwa differenti ħafna minn
liema mains memorja tiegħek.

1332
01:10:02,100 --> 01:10:03,300
Yeah.

1333
01:10:03,300 --> 01:10:03,800
Whew!

1334
01:10:03,800 --> 01:10:05,470
Kulħadd OK fuq dan?

1335
01:10:05,470 --> 01:10:06,750
Dan kien konfuża.

1336
01:10:06,750 --> 01:10:09,380
Suġġetti tajba ħafna li jmorru fuq,
għax int probabilment

1337
01:10:09,380 --> 01:10:12,255
se tikseb xi delikata
affarijiet bħal dik fuq il-kwizz.

1338
01:10:12,255 --> 01:10:13,350
Yeah.

1339
01:10:13,350 --> 01:10:13,850
Kessaħ.

1340
01:10:13,850 --> 01:10:16,014

1341
01:10:16,014 --> 01:10:18,430
I ser jitqiegħdu ikollok 100 fuq waħda
linja u mbagħad 10 fuq l-oħra.

1342
01:10:18,430 --> 01:10:21,468
Yeah, tajjeb ħafna.

1343
01:10:21,468 --> 01:10:26,350
>> OK, issa inti guys se tikseb
l-opportunità li jkun l-TAs.

1344
01:10:26,350 --> 01:10:30,600
Ikollok biex twieġeb l-sabiħ
emails li I kultant nikseb.

1345
01:10:30,600 --> 01:10:34,290
>> Allura, Għażiż Andi, nara I think xi ħaġa huwa
tmur ħażin ma kompilatur tiegħi.

1346
01:10:34,290 --> 01:10:37,910
Jien ċert li kodiċi tiegħi hija korretta,
imma I iżommu jkollna tort segmentazzjoni

1347
01:10:37,910 --> 01:10:39,074
kull darba I run.

1348
01:10:39,074 --> 01:10:39,740
X'qed jiġri?

1349
01:10:39,740 --> 01:10:42,844
Jekk jogħġbok jgħinu, lottijiet tal-imħabba.

1350
01:10:42,844 --> 01:10:45,740

1351
01:10:45,740 --> 01:10:49,410
>> Jekk inti guys ltqajna xi ħaġa bħal
li kif tista twieġeb?

1352
01:10:49,410 --> 01:10:51,860
Dawn huma attwalment komuni ħafna
mistoqsijiet aħna ser jgħidlek.

1353
01:10:51,860 --> 01:10:54,090
Hija jekk, aħna ser jagħtuk
xenarju, aħna ser tagħtina

1354
01:10:54,090 --> 01:10:56,350
raden aħjar tiegħek fuq x'inhu għaddej.

1355
01:10:56,350 --> 01:11:00,710
Kull min ikollu stab lejn dak li jiġri?

1356
01:11:00,710 --> 01:11:02,654
Yeah?

1357
01:11:02,654 --> 01:11:06,056
>> UDJENZA: Forsi dereferenced il
null, xi ħaġa bħall-pointer

1358
01:11:06,056 --> 01:11:08,924
hija li tipponta lejn xi ħaġa null.

1359
01:11:08,924 --> 01:11:11,590
Professur: Yeah, li d tkun
Eżempju ta 'meta dik jiġri.

1360
01:11:11,590 --> 01:11:14,467
Imma x'inhu l-istampa akbar
tal x'inhu għaddej hawn?

1361
01:11:14,467 --> 01:11:17,050
UDJENZA: Huwa inti qed tipprova
għall-aċċess memorja li int mhux

1362
01:11:17,050 --> 01:11:18,175
suppost li jkollhom aċċess għall-?

1363
01:11:18,175 --> 01:11:19,200
Professur: Eżattament.

1364
01:11:19,200 --> 01:11:24,800
Allura taħseb ta 'ħsara seg, off
limiti, żona ristretta fil-memorja

1365
01:11:24,800 --> 01:11:27,780
li inti m'għandekx tkun jmissux.

1366
01:11:27,780 --> 01:11:31,670
>> Allura pretty ħafna meta inti qed tipprova
li index-- bħal per eżempju,

1367
01:11:31,670 --> 01:11:34,110
inti ħadthom iddikjarata bħala
array minn żero sa disgħa.

1368
01:11:34,110 --> 01:11:37,360
Imma inti tipprova tmissx dik 10
valur, inti ma għandekx aċċess għal dan.

1369
01:11:37,360 --> 01:11:38,694
Għaliex inti ma ddikjarat dan.

1370
01:11:38,694 --> 01:11:40,943
U għalhekk il-kompjuter tiegħek se
li tħares lejn dan ikun simili,

1371
01:11:40,943 --> 01:11:43,440
UH oh, inti qed tipprova tmur
jitilgħu lil hinn minn indiċi.

1372
01:11:43,440 --> 01:11:45,270
Jien ser jagħtuk
tort segmentazzjoni.

1373
01:11:45,270 --> 01:11:46,590
>> Think ta 'kif segment, id-dritt?

1374
01:11:46,590 --> 01:11:49,665
Segment żejda, it-tort huwa
meta inti tipprova ksur xi ħaġa

1375
01:11:49,665 --> 01:11:50,790
u inti ma għandu jkun hemm.

1376
01:11:50,790 --> 01:11:53,660
Tort Segmentazzjoni hija ghaċ
inti tipprova tmissx affarijiet

1377
01:11:53,660 --> 01:11:54,970
li inti m'għandekx tkun jmissux.

1378
01:11:54,970 --> 01:11:56,815
>> Eżempji hekk komuni huma indiċi.

1379
01:11:56,815 --> 01:11:58,940
Of course, jekk inti qed tipprova
tmissx dan kien null,

1380
01:11:58,940 --> 01:12:00,220
li wkoll taħdem ukoll.

1381
01:12:00,220 --> 01:12:02,300
Jekk pointer tiegħek kien qed jipprova
touch affarijiet li m'għandhomx touch,

1382
01:12:02,300 --> 01:12:03,730
li jista 'jaħdem ukoll.

1383
01:12:03,730 --> 01:12:07,120
Ħafna tipikament tkun taf
tara dan fil-firxa.

1384
01:12:07,120 --> 01:12:07,740
Kulħadd tajba?

1385
01:12:07,740 --> 01:12:10,374
>> UDJENZA: Mela jekk inti tixtieq
aċċess għall-10 punt

1386
01:12:10,374 --> 01:12:12,290
u hemm biss limitu
ta 'disa' jew xi ħaġa.

1387
01:12:12,290 --> 01:12:13,160
>> Professur: Yeah, eżattament.

1388
01:12:13,160 --> 01:12:13,660
Pretty ħafna.

1389
01:12:13,660 --> 01:12:15,930

1390
01:12:15,930 --> 01:12:16,430
Kessaħ.

1391
01:12:16,430 --> 01:12:19,070

1392
01:12:19,070 --> 01:12:19,920
>> Għażiż Andi.

1393
01:12:19,920 --> 01:12:23,440
Allura konna ltqajna dawn wunderbare
affarijiet imsejħa xorta.

1394
01:12:23,440 --> 01:12:25,472
Jekk Jingħaqdu sort-- kif aħna
raw fl-eżempju meta

1395
01:12:25,472 --> 01:12:27,180
David għamlet l-sħiħ
ħaġa fil class-- għaliex,

1396
01:12:27,180 --> 01:12:29,760
jekk huwa hekk ħafna aktar mgħaġġla minn
kwalunkwe mill-tipi oħra,

1397
01:12:29,760 --> 01:12:33,310
għaliex għandna lanqas biss jitħajru jafu
kwalunkwe mill-tipi oħra?

1398
01:12:33,310 --> 01:12:35,100
>> X'inhu din il-mistoqsija verament inti titlob?

1399
01:12:35,100 --> 01:12:36,659
X'hemm-tliet word--

1400
01:12:36,659 --> 01:12:37,950
UDJENZA: X'inhu l-kompromess?

1401
01:12:37,950 --> 01:12:38,530
Professur: Eżattament.

1402
01:12:38,530 --> 01:12:39,946
Dak hu s tistaqsi l-mistoqsija.

1403
01:12:39,946 --> 01:12:43,682
X'hemm-kompromess bejn
Jingħaqdu tip versi xi tip ieħor?

1404
01:12:43,682 --> 01:12:45,850
>> UDJENZA: Jieħu memorja, right?

1405
01:12:45,850 --> 01:12:47,720
>> Professur: Do you
tispjega li ftit aktar?

1406
01:12:47,720 --> 01:12:49,490
L-ewwel ejja tispjega maħżen Merge.

1407
01:12:49,490 --> 01:12:50,970
Kif Jingħaqdu sort xogħol?

1408
01:12:50,970 --> 01:12:55,220
>> UDJENZA: Allura taħdem mill
diviżjoni kollox fis-nofs

1409
01:12:55,220 --> 01:13:00,660
u mbagħad tqegħid flimkien
u allokazzjoni mill-ġdid dan sabiex,

1410
01:13:00,660 --> 01:13:02,862
bħal kull darba li inti jingħaqdu l-settijiet.

1411
01:13:02,862 --> 01:13:03,820
Professur: Pretty ħafna.

1412
01:13:03,820 --> 01:13:06,861
So I jista 'jiġbed dan out, iżda kieku
tieħu me ħames minuti biex tiġbed out.

1413
01:13:06,861 --> 01:13:10,220
Ħarsa lura fuq il-pjastri taqsima
fejn aħna koperti tip Merge.

1414
01:13:10,220 --> 01:13:10,790
Eżattament.

1415
01:13:10,790 --> 01:13:13,406
>> Allura l-mod Jingħaqdu xogħlijiet sort
huwa jaqsam affarijiet fil nofs,

1416
01:13:13,406 --> 01:13:15,780
u allura biss tħares lejn il-
ewwel valuri ta 'kull wieħed minnhom

1417
01:13:15,780 --> 01:13:17,000
u xorta biss dik.

1418
01:13:17,000 --> 01:13:20,364
Kontinwament joħloq arrays ġodda u
tpoġġi l-affarijiet aktar u aktar fl-ordni.

1419
01:13:20,364 --> 01:13:23,030
U hekk filwaqt li tassew, tassew
fast għaliex it's-- tafu,

1420
01:13:23,030 --> 01:13:25,380
tfittxija binarju huwa log n ta 'n.

1421
01:13:25,380 --> 01:13:27,880
Int ħolqien tant
arrays differenti li int

1422
01:13:27,880 --> 01:13:29,700
tuża ammont kbir ta 'memorja.

1423
01:13:29,700 --> 01:13:33,080
U għalhekk filwaqt li huwa aktar mgħaġġel, il-kummerċ off
hawnhekk hija li inti qed tuża memorja aktar.

1424
01:13:33,080 --> 01:13:38,490
>> U għalhekk, ħjiel, xorta u tfittxijiet
kienu koperti ħafna aktar din is-sena

1425
01:13:38,490 --> 01:13:41,610
milli kienu fi snin preċedenti.

1426
01:13:41,610 --> 01:13:45,100
You guys għandhom jaraw li
hekk rifless fuq il-kwizz.

1427
01:13:45,100 --> 01:13:49,160
Nixtieq definittivament jqattgħu ħin se
fuq liema kollha ta 'l suriet differenti

1428
01:13:49,160 --> 01:13:52,320
huma, tfittxija kif binarju,
kif ix-xogħol search lineari.

1429
01:13:52,320 --> 01:13:54,750
Kif forsi pseudocode
kodiċi dawk out.

1430
01:13:54,750 --> 01:13:55,950
X'inhuma l-ħinijiet running?

1431
01:13:55,950 --> 01:13:59,210
Xi ħaġa simili żminijiet running huwa ferm
faċli għall-kopja isfel fuq folja nota,

1432
01:13:59,210 --> 01:13:59,710
id-dritt?

1433
01:13:59,710 --> 01:14:01,420
>> Huwa tassew diffiċli meta int
fin-nofs-test

1434
01:14:01,420 --> 01:14:02,390
u inti għandek figura li out.

1435
01:14:02,390 --> 01:14:03,160
Kopja isfel.

1436
01:14:03,160 --> 01:14:05,550
I garanzija li inti int
ser jeħtieġ li tkun taf li.

1437
01:14:05,550 --> 01:14:06,860
X'inhuma l-kompromessi?

1438
01:14:06,860 --> 01:14:10,064
Agħar każ, każ xenarji aħjar
għal kull wieħed minnhom, ħafna isiru jafu.

1439
01:14:10,064 --> 01:14:10,564
Yeah?

1440
01:14:10,564 --> 01:14:12,730
>> UDJENZA: Għandna bżonn li
taf kif kodiċi sort Merge?

1441
01:14:12,730 --> 01:14:15,470
Bħal, għandna bżonn li
tiftakar il-rikursivi?

1442
01:14:15,470 --> 01:14:18,950
>> Professur: I ħafna dubju dan, biss
għaliex huwa simili pjuttost ikkumplikata.

1443
01:14:18,950 --> 01:14:22,282
Iżda jista 'ma jkunx fattibbli jekk aħna
nitolbok biex tuża pseudocode it out.

1444
01:14:22,282 --> 01:14:22,781
Yeah.

1445
01:14:22,781 --> 01:14:25,470

1446
01:14:25,470 --> 01:14:29,170
>> Yep, OK, wieħed aktar.

1447
01:14:29,170 --> 01:14:31,387
Dan jista għandhom joħorġu fis
inti aħħar biċċa fil-daqsxejn.

1448
01:14:31,387 --> 01:14:42,101

1449
01:14:42,101 --> 01:14:43,090
Yeah?

1450
01:14:43,090 --> 01:14:44,930
Did kulħadd tisma li?

1451
01:14:44,930 --> 01:14:48,360
>> OK, so pretty ħafna ewwel ta
kollox, liema tip ta 'programm

1452
01:14:48,360 --> 01:14:51,000
Ikun jagħtik output bħal din?

1453
01:14:51,000 --> 01:14:54,350
Ftakar staqsejna biex titgħallem dwar
dan it-tip ġdid ta 'debugging għodda?

1454
01:14:54,350 --> 01:14:57,340
Liema kien l-isem ta 'dan?

1455
01:14:57,340 --> 01:14:59,460
Valgrind, id-dritt

1456
01:14:59,460 --> 01:15:02,600
>> Kienet programm fejn
inti tista 'sejħa li jista

1457
01:15:02,600 --> 01:15:05,940
iżżomm kont ta 'l-memorja int
użu fil-programm tiegħek u li kien għaddej.

1458
01:15:05,940 --> 01:15:11,090
Mela jekk inti ħadthom ltqajna xi ħaġa, bħal,
definittivament mitlufa, 40 bytes fil-blokk wieħed.

1459
01:15:11,090 --> 01:15:14,870
Probabbilment int ma
ftakar ħielsa it.

1460
01:15:14,870 --> 01:15:18,710
Għaliex jekk inti qed tuża bytes ta 'memorja,
dan ifisser li inti ħadthom aċċessata li l-memorja,

1461
01:15:18,710 --> 01:15:20,240
imma inti ma ġewx jista 'jeħles.

1462
01:15:20,240 --> 01:15:21,948
Allura inti tixtieq li tagħmel
żgur li int ukoll

1463
01:15:21,948 --> 01:15:31,420
użu free-- li l-
function-- li ħielsa kollha

1464
01:15:31,420 --> 01:15:34,930
tal-memorja riallokati mill malloc.

1465
01:15:34,930 --> 01:15:35,500
>> Kessaħ.

1466
01:15:35,500 --> 01:15:37,140
Allura dan slide, jien ser ikollhom it up.

1467
01:15:37,140 --> 01:15:41,050
Huwa kullimkien fil-lott ta '
lectures, fil-lott ta 'slides taqsima.

1468
01:15:41,050 --> 01:15:44,254
Int verament tixtieq li tagħmel ċert
inti biss taf kollha ta 'dan.

1469
01:15:44,254 --> 01:15:47,170
Jew fil-folja nota tiegħek jew jekk inti
tixtieq li jimmemorizah, tħossok liberu li.

1470
01:15:47,170 --> 01:15:48,836
Li tassew, tassew, tassew importanti.

1471
01:15:48,836 --> 01:15:53,200

1472
01:15:53,200 --> 01:15:56,890
>> Wkoll tajba ħafna
kwistjoni li aħna tista 'titlob.

1473
01:15:56,890 --> 01:16:00,320
Għaliex huwa Għażla sort-- ħarsa lejn
Għażla sort-- kollha tal-runtimes

1474
01:16:00,320 --> 01:16:02,060
huma n kwadrat.

1475
01:16:02,060 --> 01:16:06,714
Indipendentement minn kif l-lista tiġi
inti bħala, hekk għaliex huwa sort-- Għażla

1476
01:16:06,714 --> 01:16:08,630
I ser jagħtuk guys 30
tieni jaħsbu dwar dan.

1477
01:16:08,630 --> 01:16:10,700
Għaliex dan huwa tip ta 'konfużjoni.

1478
01:16:10,700 --> 01:16:12,710
Dan jinvolvi riflessjoni kunċettwali.

1479
01:16:12,710 --> 01:16:16,470
Għaliex kieku l-ħinijiet run ikunu l-istess fl
kemm-agħar u l-aħjar xenarji każ?

1480
01:16:16,470 --> 01:16:28,850

1481
01:16:28,850 --> 01:16:30,000
>> Yeah?

1482
01:16:30,000 --> 01:16:38,084
>> UDJENZA: Minħabba Għażla sort kull
pożizzjoni jew spazju f'dan array ftit

1483
01:16:38,084 --> 01:16:40,350
ħaġa jew ikun x'ikun.

1484
01:16:40,350 --> 01:16:44,430
Hekk anke fil-aħjar xenarju,
anki jekk huwa perfettament magħżula,

1485
01:16:44,430 --> 01:16:47,380
ikun meħtieġ li din għandhom ikunu bħal, OK, wieħed.

1486
01:16:47,380 --> 01:16:49,000
Fl-ewwel post tiegħi I jkollhom waħda.

1487
01:16:49,000 --> 01:16:50,250
U jgħaddu kull wieħed minnhom.

1488
01:16:50,250 --> 01:16:51,249
OK, wieħed huwa l-iżgħar.

1489
01:16:51,249 --> 01:16:53,053
U allura tmur mill-ġdid
u huwa simili, OK, żewġ

1490
01:16:53,053 --> 01:16:54,594
huwa l-iżgħar ta 'kollha ta' l-affarijiet.

1491
01:16:54,594 --> 01:16:56,804
Iżda xorta trid
iċċekkja kull wieħed.

1492
01:16:56,804 --> 01:16:57,470
Professur: Yeah.

1493
01:16:57,470 --> 01:17:00,490
Hekk per eżempju, ejja biss jgħidu
Għandna lista, diġà magħżula,

1494
01:17:00,490 --> 01:17:03,390
firxa 1-5.

1495
01:17:03,390 --> 01:17:07,100
Il-mod li xorta Għażla hija li
din tmur permezz, hija għandha tivverifika dawn iż-żewġ.

1496
01:17:07,100 --> 01:17:08,234
Imbagħad hija għandha tivverifika dawn iż-żewġ.

1497
01:17:08,234 --> 01:17:09,650
U allura din il-kontrolli, u din il-kontrolli.

1498
01:17:09,650 --> 01:17:13,285
Hija żżomm kontroll kollha kemm huma,
irrispettivament minn jekk jew le

1499
01:17:13,285 --> 01:17:14,160
huwa attwalment magħżula.

1500
01:17:14,160 --> 01:17:16,450
Minħabba li sempliċiment
il-mod il-tip jaħdem.

1501
01:17:16,450 --> 01:17:19,530
>> U għalhekk din il-kwistjoni huwa tip simili
kwistjoni kunċettwali aħna ser titlob.

1502
01:17:19,530 --> 01:17:21,430
Fejn l-ewwel, inti
jafu x'tip Għażla

1503
01:17:21,430 --> 01:17:23,304
huwa, dritt, li tkun tista
risposta għad-domanda.

1504
01:17:23,304 --> 01:17:26,200
Int għandek tkun kapaċi jifhmu
kunċettwalment x'inhu għaddej.

1505
01:17:26,200 --> 01:17:30,760
U allura inti tista 'tapplika u think, OK
ejja biss jimmaġina agħar każ.

1506
01:17:30,760 --> 01:17:32,230
Huma qed kollha f'ordni dixxendenti.

1507
01:17:32,230 --> 01:17:33,290
Kif kien li jaffettwaw dan?

1508
01:17:33,290 --> 01:17:34,650
>> X'jiġri jekk huwa axxendenti ordni?

1509
01:17:34,650 --> 01:17:35,640
Jekk huwa diġà magħżula?

1510
01:17:35,640 --> 01:17:37,240
Kif kien li jaffettwaw l-runtimes?

1511
01:17:37,240 --> 01:17:40,270
U mbagħad sort Għażla, tkun taf Avviż
li din attwalment ma jimpurtax.

1512
01:17:40,270 --> 01:17:43,500
Għax int iċċekkjar l-
Valuri irrispettivament ta 'dak li qed jiġri.

1513
01:17:43,500 --> 01:17:45,810
>> U sabiex l-affarijiet tajbin li wieħed jiftakru.

1514
01:17:45,810 --> 01:17:50,290
Għaliex xi tipi huma differenti minn oħrajn
u kif l-aħjar u agħar xenarji

1515
01:17:50,290 --> 01:17:52,740
jaffettwa kull wieħed minnhom.

1516
01:17:52,740 --> 01:17:56,700
>> Jien ser verament hit fil xorta
minħabba li se tkun fuq l-kwizz.

1517
01:17:56,700 --> 01:17:57,199
Yeah.

1518
01:17:57,199 --> 01:18:00,820

1519
01:18:00,820 --> 01:18:01,320
KOLLOX SEW.

1520
01:18:01,320 --> 01:18:05,590
Hemm sitt minuti xellug.

1521
01:18:05,590 --> 01:18:09,880
I tista 'tieħu tliet minuti ta' mistoqsijiet.

1522
01:18:09,880 --> 01:18:12,290
I tista 'wkoll hang madwar għal
bħal 20 minuta wara taqsima

1523
01:18:12,290 --> 01:18:13,850
jekk inti tixtieq li jistaqsu mistoqsijiet kif ukoll.

1524
01:18:13,850 --> 01:18:16,330
Hawn xi ħadd sempliċiment għandek verament fil-qosor
mistoqsijiet jew kwistjonijiet konċettwali

1525
01:18:16,330 --> 01:18:17,360
dawn qed mhux ċar dwar id-dritt issa?

1526
01:18:17,360 --> 01:18:17,832
Yeah?

1527
01:18:17,832 --> 01:18:19,720
>> UDJENZA: Tista 'tkellem ftit
ftit dwar operaturi bitwise?

1528
01:18:19,720 --> 01:18:20,280
>> Professur: Yeah.

1529
01:18:20,280 --> 01:18:22,446
Operaturi hekk bitwise huma
xi ħaġa li inti probabilment

1530
01:18:22,446 --> 01:18:24,170
tista 'biss jixtiequ li jpoġġu fuq il-folja tiegħek.

1531
01:18:24,170 --> 01:18:27,540
So quickly-- Ma rridx
li jmorru wisq fil-fond

1532
01:18:27,540 --> 01:18:31,164
għaliex Harvard, fir-reviżjoni tagħhom
sessjoni, koperti dan pretty ukoll.

1533
01:18:31,164 --> 01:18:33,080
Operatur bitwise, hemm
ħamsa minnhom, id-dritt?

1534
01:18:33,080 --> 01:18:41,370
>> Hemm dan, li huwa x jew funzjoni,
hemm ampersand, li hija l-u.

1535
01:18:41,370 --> 01:18:44,050
Pipe, li hija l-jew.

1536
01:18:44,050 --> 01:18:46,790
U allura inti għandek il-żewġ
tipi differenti ta 'xiftijiet.

1537
01:18:46,790 --> 01:18:50,610
>> Jekk I jagħtuk żewġ valuri, jekk
I jagħtuk, bħal, wieħed u waħda.

1538
01:18:50,610 --> 01:18:52,390
X'għandu li tevalwa?

1539
01:18:52,390 --> 01:18:55,490
Jekk I jagħtuk vera u vera, vera?

1540
01:18:55,490 --> 01:18:56,930
What about vera jew falza?

1541
01:18:56,930 --> 01:18:57,830
Still vera, right?

1542
01:18:57,830 --> 01:18:59,762
Għaliex hemm xi jew.

1543
01:18:59,762 --> 01:19:01,220
Aktar probabbli aħna ser jagħtuk numri.

1544
01:19:01,220 --> 01:19:03,780
Mela ftakar, wieħed ugwali
veru, żero ugwali falza.

1545
01:19:03,780 --> 01:19:07,407
U nistgħu nagħtuk dawn l-affarijiet
u nitolbok biex tgħidilna dak li jiġri.

1546
01:19:07,407 --> 01:19:10,240
Harvard tkopri miegħu fis-ewwel
10 minuta ta 'sessjoni studju tagħhom

1547
01:19:10,240 --> 01:19:11,230
tassew, tassew tajjeb.

1548
01:19:11,230 --> 01:19:14,260
Allura inti guys tixtieq li tagħmel
ruħek li tfittex lura fuq dik.

1549
01:19:14,260 --> 01:19:16,387
>> UDJENZA: Huwa pisa5
se tkun fuq l-kwizz?

1550
01:19:16,387 --> 01:19:16,970
Professur: Le

1551
01:19:16,970 --> 01:19:18,240
Lanqas ma nħarsu lejn pisa5 dritt issa.

1552
01:19:18,240 --> 01:19:18,810
Huwa diffiċli.

1553
01:19:18,810 --> 01:19:22,830
Biss ma lanqas biss jitħajru jħarsu lejn pisa5.

1554
01:19:22,830 --> 01:19:25,665
>> Madankollu, peress li xi ideat
u suġġerimenti, I

1555
01:19:25,665 --> 01:19:28,320
jissuġġerixxi tibda pisa5
hekk kif il-kwizz huwa fuq.

1556
01:19:28,320 --> 01:19:30,319
Dan se jkun l-agħar
ġimgħa, iżda imbagħad inti guys

1557
01:19:30,319 --> 01:19:34,590
se jiġu mgħoddija fuq l-għoljiet
tar-rolling aħdar u ġriewi,

1558
01:19:34,590 --> 01:19:36,115
u huwa multa.

1559
01:19:36,115 --> 01:19:39,810
>> Din il-klassi gets sinifikanti
aktar faċli wara l-ħames pset.

1560
01:19:39,810 --> 01:19:41,560
Uffiċċju siegħa: UDJENZA
huma Ħadd, it-tnejn?

1561
01:19:41,560 --> 01:19:44,260
Professur: Yeah, so ħinijiet tal-uffiċċju se
tal-Ħadd sat-Tnejn għall-pset.

1562
01:19:44,260 --> 01:19:47,009
Uffiċċju siegħa tonight essenzjalment
se jkun biss reviżjoni għall-kwizz.

1563
01:19:47,009 --> 01:19:50,350
Jekk xi ħadd irid li ġejjin fi u jistaqsu
il TAs mistoqsija, aħna ser ikunu hemm.

1564
01:19:50,350 --> 01:19:53,220
>> I ser tieħu forsi aktar mistoqsija waħda
jekk xi ħadd ikollu xi mistoqsija?

1565
01:19:53,220 --> 01:19:53,809
Yeah?

1566
01:19:53,809 --> 01:19:55,850
UDJENZA: Meta int
lymph jiddefinixxu, [inaudible]

1567
01:19:55,850 --> 01:20:00,700
jekk inti tgħidli star node u mbagħad jmiss,
ma l-kompjuter awtomatikament

1568
01:20:00,700 --> 01:20:03,610
jifhmu li int
jirreferu għall pointer ieħor?

1569
01:20:03,610 --> 01:20:04,580
>> Professur: Le

1570
01:20:04,580 --> 01:20:06,710
>> UDJENZA: Inti għandek biex
relink dan [inaudible]?

1571
01:20:06,710 --> 01:20:09,270
>> Professur: Allura bażikament l-
Struct ta 'nodu huwa, ftakar,

1572
01:20:09,270 --> 01:20:12,620
huwa simili inti toħloq l-node u
imbagħad inti għandek pointer imsejjaħ jmiss.

1573
01:20:12,620 --> 01:20:14,630
Kulma qed tagħmel qed ikollha
l-istruttura hemmhekk.

1574
01:20:14,630 --> 01:20:16,387
Int għandek tassenja
li pointer x'imkien.

1575
01:20:16,387 --> 01:20:18,470
Allura l-kompjuters ma
jafu dak li qed jagħmel s'issa.

1576
01:20:18,470 --> 01:20:20,250
Int għandek attwalment tassenja din meta
int ħolqien lista marbuta tiegħek.

1577
01:20:20,250 --> 01:20:22,170
U dan huwa dak l-aktar
pset 5 se tkun fuq.

1578
01:20:22,170 --> 01:20:24,106
Sabiex l-ebda inkwiet dwar
kwalunkwe ta 'dak id-dritt issa.

1579
01:20:24,106 --> 01:20:26,380
>> UDJENZA: Allura aħna ma bżonn li
tiffoka wisq fuq il-lista link, just

1580
01:20:26,380 --> 01:20:27,440
il-kunċett ġenerali?

1581
01:20:27,440 --> 01:20:30,980
>> Professur: Just stacks pretty ħafna,
kjuwijiet, listi rabta, siġar, tabelli hash.

1582
01:20:30,980 --> 01:20:33,639
Just ikunu jistgħu jsiru jafu liema huma.

1583
01:20:33,639 --> 01:20:35,680
Aħna mhux se jistaqsu
inti tixtieq xi ħaġa speċifika

1584
01:20:35,680 --> 01:20:39,300
għaliex aħna ma verament għamlu
pset li l ikopri xi li għadu.

1585
01:20:39,300 --> 01:20:45,540
>> Għalhekk fl-aħħar żewġ minuti qabel
I sett inti liberu li joqtlu dan il-kwizz.

1586
01:20:45,540 --> 01:20:49,370
Pretty ħafna, bħal, jaħsbu dwar kif
ferm inti guys waslu f'din il-klassi.

1587
01:20:49,370 --> 01:20:52,820
>> I tiftakar meta ġimgħatejn
ta 'din il-klassi, xi wħud minnkom

1588
01:20:52,820 --> 01:20:55,720
jqattgħu tliet sigħat miktub ilma.

1589
01:20:55,720 --> 01:20:57,970
Kemm idum ser tieħu inti
guys li tikteb ilma issa?

1590
01:20:57,970 --> 01:20:59,670
30 sekonda, forsi?

1591
01:20:59,670 --> 01:21:01,810
Aħseb dwar kemm
inti guys tgħallmu.

1592
01:21:01,810 --> 01:21:04,320
CS huwa suġġett tassew, tassew iebsa.

1593
01:21:04,320 --> 01:21:06,190
M'hemm l-ebda dubju ta 'dak.

1594
01:21:06,190 --> 01:21:09,160
Huwa diffiċli, hu għalhekk ebda wieħed istudji dan.

1595
01:21:09,160 --> 01:21:10,730
Huwa biss iebsa.

1596
01:21:10,730 --> 01:21:11,650
U huwa totalment multa.

1597
01:21:11,650 --> 01:21:14,150
>> U jien verament kburi li
kulħadd għamlitha s'hawn.

1598
01:21:14,150 --> 01:21:16,380
Psets huma mhux faċli.

1599
01:21:16,380 --> 01:21:17,790
Huma jieħdu ħafna ħin.

1600
01:21:17,790 --> 01:21:22,580
You guys, jien qatt se jgħidlek biex jiktbu
il-logħba ta '15 jew Vigenere fuq il-pset.

1601
01:21:22,580 --> 01:21:24,160
Ebda ħtieġa għal ftit skerz dwar dan.

1602
01:21:24,160 --> 01:21:28,080
Kollha aħna qed ittestjar hawn huwa li jevalwa
għarfien kunċettwali tiegħek, kif ukoll

1603
01:21:28,080 --> 01:21:31,524
peress li wħud mill-ħiliet bażiċi tiegħek ta 'kodifikazzjoni.

1604
01:21:31,524 --> 01:21:33,440
It-test huwa maħsub biex
tkun verament sfida.

1605
01:21:33,440 --> 01:21:36,180
Bħal, din hi maħsuba
għalik li ma jkollokx 100.

1606
01:21:36,180 --> 01:21:39,880
Hija maħsuba wkoll biex inti probabilment
ma jkunux jistgħu jispiċċaw fil-75 minuta.

1607
01:21:39,880 --> 01:21:41,995
U li totalment multa.

1608
01:21:41,995 --> 01:21:42,870
I'ma student myself.

1609
01:21:42,870 --> 01:21:45,960
I know, I mibegħda meta I walk
minn kwizz jkunu simili, shit.

1610
01:21:45,960 --> 01:21:47,044
Dan kien verament iebsa.

1611
01:21:47,044 --> 01:21:49,460
Probabbilment dak li għaddej biex
happen-- u li l-totalment multa,

1612
01:21:49,460 --> 01:21:50,751
Jien tghidlek guys dritt issa.

1613
01:21:50,751 --> 01:21:53,190
Il-mezzi fuq dawn l-affarijiet
mhumiex għoljin fil-livelli kollha.

1614
01:21:53,190 --> 01:21:55,360
>> U għal dawk minnkom li
ġew jkollna, bħal,

1615
01:21:55,360 --> 01:21:57,870
threes fuq settijiet problema tiegħek,
dan ma jfissirx li int

1616
01:21:57,870 --> 01:21:59,536
se tikseb 60 fil-mija f'din il-klassi.

1617
01:21:59,536 --> 01:22:01,440
Jekk ikollok 60% fuq il-
kwizz, li ma

1618
01:22:01,440 --> 01:22:03,330
jfissirx li inti qed tmur biex
jiksbu D f'din il-klassi.

1619
01:22:03,330 --> 01:22:05,740
Naraw, speċjalment I, għal
dawk minnkom fit-taqsima tiegħi,

1620
01:22:05,740 --> 01:22:07,406
I tara kif iebes inti guys huma kollha jaħdmu.

1621
01:22:07,406 --> 01:22:09,190
U jien jżommu rekord ta 'dak.

1622
01:22:09,190 --> 01:22:11,420
>> You guys se tkun multa.

1623
01:22:11,420 --> 01:22:14,580
M'hemm l-ebda tradizzjoni istituzzjonali ta
kuntentizza fl-aħħar tas-semestru.

1624
01:22:14,580 --> 01:22:16,840
Minħabba l-gidien Harvard qed ngħidu
ħbieb tagħhom, oh, inti ser tkun multa.

1625
01:22:16,840 --> 01:22:18,381
Ħadd ma huwa tghidlek guys li hawn.

1626
01:22:18,381 --> 01:22:20,950
So I jkollhom biex jgħidlek guys li hawn.

1627
01:22:20,950 --> 01:22:22,280
>> You guys se tkun multa.

1628
01:22:22,280 --> 01:22:24,080
Jien tant kburi ta 'dak kollu inti guys.

1629
01:22:24,080 --> 01:22:25,680
It-test se jkun diffiċli.

1630
01:22:25,680 --> 01:22:28,140
Studju għaliha, u wara
biss armih.

1631
01:22:28,140 --> 01:22:31,280
Lestu biex jitgħallmu affarijiet ġodda.

1632
01:22:31,280 --> 01:22:33,990
U jieklu kandju.

1633
01:22:33,990 --> 01:22:35,940
Imxejna lottijiet ta 'kandju.

1634
01:22:35,940 --> 01:22:37,760
>> Get rqad bil-lejl tajba.

1635
01:22:37,760 --> 01:22:40,420
Ma 'rqad, minħabba
li d jkun tassew ħżiena.

1636
01:22:40,420 --> 01:22:41,490
CS hija lott ta 'loġika.

1637
01:22:41,490 --> 01:22:44,960
Jekk inti ma torqod, inti ma tistax tiffunzjona,
u l-moħħ tiegħek ma jistax jaħdem.

1638
01:22:44,960 --> 01:22:48,780
U jien ser jkun hawn għall-20 li jmiss
minuti jekk xi ħadd irid li hang madwar.

1639
01:22:48,780 --> 01:22:51,150
You guys huma ser jinqatel.

1640
01:22:51,150 --> 01:22:53,000
Xorti tajba.

1641
01:22:53,000 --> 01:22:55,663