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>> [Daqq ta mużika]

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>> -Alright!

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>> -Dan Huwa CS50.

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>> -Dan Huwa CS50.

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>> -Dan Huwa CS50.

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[MUSIC - Iggy AZALEA, "fancy"]

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>> Memorja favoriti -My minn CS50
kien meta I marru għall Puzzle Jum.

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>> -Probably Biss fil-ħin
qattgħu jaħdmu fuq settijiet problema

10
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mal-ħbieb tiegħi u nies li wold
eventwalment issir blockmates tiegħi.

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>> -My Aħjar memorja minn
CS50 huwa l-Hackathon.

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-Il CS50 Hackathon.

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>> -Hackathon.

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>> -Hackathon.

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-Hackathon.

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-Il Hackathon

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-Rob Bowden.

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Just kollox dwar lilu.

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>> [MUSIC - Iggy AZALEA, "fancy"]

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>> Memorja favoriti -My huwa meta I kien fuq
palk u I kellu l-irwol prestiġjuż

22
00:01:02,512 --> 00:01:04,220
ta 'node [? fil-Marbuta?]
[? Lista. ?]

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>> -Meta Aħna kollha ltqajna ispazju Dropbox liberu u
David kien simili, jfittxu taħt sedili tiegħek.

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U li kien simili, spazju għal kulħadd!

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>> [MUSIC - Iggy AZALEA, "fancy"]

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>> Parir -My għal kwalunkwe
student deħlin kieku

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jkun li verament jaħdmu fuq
P-settijiet mal-ħbieb.

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>> Sigħat -Office huwa ferm ħabib tiegħek.

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>> Għamla l-aktar ta 'esperjenza tiegħek
u jiltaqa nies kemm tista '.

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>> -Don't Jibżgħux jistaqsu għall-għajnuna.

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-Start P-settijiet kmieni fil-ġimgħa.

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-I Jaħsbu l-akbar ħaġa hija li
jieħdu vantaġġ tar-riżorsi kollha

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li CS50 għandha.

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>> -Go Li ħinijiet tal-uffiċċju kmieni fil-ġimgħa.

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>> -Definitely Tara l-xorts.

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>> -Don't Procrastinate fuq P-settijiet tiegħek.

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Għamla żgur li int issib grupp kbir
ta 'nies li jaħdmu fuq P-settijiet.

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Inti tista 'jkollha lott ta' gost
u jiksbu xogħol magħmul flimkien.

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>> -Don't Jibżgħux biex timbotta lilek innifsek.

41
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Mur għall-Hacker edizzjoni kultant.

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>> Affarijiet -Write fuq il-karta qabel
Qatt touch kompjuter tiegħek.

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>> -CS50 Huwa verament kbir fuq
jipprovdu modi biex tikseb l-għajnuna.

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>> -My Biċċa waħda ta 'pariri huwa l-irqad.

45
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Has xi ħadd qal li?

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Sleep, għall-żgur.

47
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Huwa faċli li ma jagħmlux, iżda
inti stajt ltqajna biex tagħmel dan, I think.

48
00:02:08,919 --> 00:02:12,982
>> -I Ngħid verament tkun ippreparata mentalment
għaliex int ser imħabba tiegħu.

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[MUSIC - Iggy AZALEA, "fancy"]

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>> -Dan Huwa CS50.

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>> -Dan Huwa CS50.

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>> -Dan Huwa CS50.

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[MUSIC - Iggy AZALEA, "fancy"]

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>> -Dan Huwa CS50.

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>> [Applause]

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>> DAVID J. Malan: Allura dan huwa CS50
u dan huwa l-aħħar ta 'f'Ġimgħa 0.

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U li kien biss ftit
tal-persunal CS50 ta li

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jistennewkom mhux biss fit-taqsimiet
u ħinijiet tal-uffiċċju, iżda,

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ukoll, dan il-weekend li ġejjin
fi Puzzle CS50 Jum.

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Li, għal darb'oħra, mhuwiex
kollha dwar l-ipprogrammar.

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Tabilħaqq, huwa mistenni li inti
mhux se jkollhom xejn programm,

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iżda pjuttost isolvu problemi jużaw
wits u ħbieb flimkien inti.

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>> Aħna se tkun magħquda bis xi
tal-ħbieb tagħna fil Facebook--

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jekk tirreġistra here-- li
għall-aħħar bosta snin,

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attwalment ġew miktub
dawn l-isfidi magħna.

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U għalhekk, dawn se jkunu dawk
finalment running Jum Puzzle.

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U għalhekk, inti ser tkun sfidata
ma preċiżament il-tip ta 'affarijiet

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u problemi li folks fil
Facebook simili biex jaħsbu dwar.

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Allura li hija għada.

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Reġistru fil cs50.harvard.edu/register.

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>> Issa kelma fuq koppja
tal-persunal, b'mod partikolari.

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Dan hawnhekk hija Ansel Duff,
li huwa attwalment wieħed

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mill-ko-awturi ta 'dawn binarja
basal li rajna nhar l-Erbgħa,

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minbarra stess Dan Bradley CS50 tal.

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Ansel Duff kien ukoll eks
advisee freshman ta 'minjiera 3 snin ilu

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u hu attwalment saħansitra mibnija dan lectern.

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He marret fuq biex tagħmel
xjenzi inġinerija u aktar.

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Issa, stampa tiegħu hawnhekk huwa attwalment
Ansel 3 snin ilu fil-Hackathon CS50

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meta hu mislufa wieħed ta 'tagħna
blalen, staġnati lill laptop tiegħu,

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u, għal dak li jmiss 12 wħud fard
sigħat, iffukat fuq il-proġett finali tiegħu,

86
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billi jieħdu waqfiet biss biex tiftaħ
boroż ta 'kandju fil-Hackathon.

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>> Imma hu marru fuq aktar reċentement biex
jonfqu dan is-sajf passat magħna,

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peress CS50 għall-istaff tagħha, u
issa studenti dan is-semestru,

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3D printer tiegħu stess.

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U fil-qosor 3D printers huwa
mezz li jistenna pjuttost bħal dan.

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You imla bil rukkell tal-plastik
li jiddewweb mill-apparat

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u inti tibni affarijiet
litteralment mix-xejn.

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Ferm simili printer inkjet, tibda
jobżoq out tikek ftit tal-plastik

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dik il-formola flimkien biex
jiffurmaw oġġetti sħaħ.

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U hekk Ansel per eżempju, aktar kmieni
dan is-sajf, għandu iPhone 5

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u ddeċieda hu verament riedu
li jsalvaw it up fuq l-iskrivanija tiegħu.

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Imma hu ma riedx
go out u jixtru xi ħaġa

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mill-maħżen Apple jew bħalhom, hekk hu
poġġa bilqiegħda u beda tpinġija xi ħaġa.

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Huwa ħa kejl ftit
kif ħoxna

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u kif wiesgħa iPhone tiegħu kien,
fassal din id-dehra hawn,

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huwa ddeċieda li ried
li jkollhom tilt 75 grad

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kif kien tluq fil
lilu fuq l-iskrivanija tiegħu hemmhekk.

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Huwa mbagħad mdawwar dan, bl-użu
software, ġo mudell 3D CAD

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li ħares ftit
xi ħaġa bħal din.

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U mbagħad huwa ipproċediet,
finalment, li attwalment joħolqu dan.

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Allura fil-fatt, jekk kwalunkwe inti hawn, forsi
fir-ringiela li I tista tarmi li, jkollhom

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an-- hemm aħna għandna folks ma iPhone
5, u hawn għandna żewġ aktar.

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>> Issa, li ma għandux outdone, l CS50 stess
Cheng Gong jistabbilixxu wkoll dan is-sajf

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biex jibnu pjuttost ftit affarijiet u,
fil-fatt, għal raġunijiet li għadhom

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mhux ċar, kien bil-mod
istampar armata ta 'ljunfanti

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ma 'armi artikolazzjoni u bagolli.

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Koppja ta 'liema huma attwalment hawn jekk
xi ħadd se issa like-- iljunfant.

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Kull dritt,. imma dak Cheng għamlet ukoll
għalina huwa hu ħafna ġentilment twaqqaf kamera

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minħabba li iljunfant,
jemmnu jew le,

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jieħu xi sentejn u
sigħat u nofs li jistampaw.

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Anki l-istand iPhone ħadet
siegħa u nofs biex jistampaw.

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U dak Cheng marru quddiem u ma
twaqqaf kamera sbieħ quddiem

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ta 'dan il-printer 3D, iffilmjati għal siegħa
u nofs bħala disinn Ansel stampat.

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Aħna sovrapposta xi sexy
mużika lilha sabiex

122
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li jtik din tfittex
lejn kif istampar 3D xogħlijiet.

123
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U anki jekk dan
huwa attwalment fil-plastik,

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jirrealizzaw li jekk dan huwa qasam
ta 'interess għalik akkademikament,

125
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hemm folks, fost
minnhom Jennifer Lewis hawn

126
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fl-Iskola ta '
Inġinerija, li huma attwalment

127
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taħdem fuq l-istampar 3D
oġġetti tal-plastik.

128
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Iżda anke, dejjem,
materjali bijoloġiċi li ssolvi

129
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problemi fiżjoloġiċi għall-bnedmin.

130
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Iżda hawnhekk huwa xi ftit
xi ħaġa minn CS50.

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>> [Loud MEKKANIKU ħsejjes]

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DAVID J. Malan: Ma ħoss
xi ħaġa bħal dik fir-realtà,

133
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iżda huwa ħafna cooler sabiex isegwu din
f'dak veloċità, u ma 'dak tal-ħoss.

134
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>> Issa, nhar l-Erbgħa, kif
aħna ma l-ewwel tikseb hawn?

135
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Bdejna nitkellmu dwar il-kompjuter
xjenza u staqsejna dak li kien.

136
00:06:43,345 --> 00:06:46,470
U huwa dwar numru ta 'affarijiet, u
hemm f'direzzjonijiet differenti tant

137
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fejn inti tista 'ras
wara kors bħal CS50.

138
00:06:48,477 --> 00:06:50,810
Fil-fatt, jekk inti telgħet waħda
ta 'dawk il-gwidi mhux uffiċjali

139
00:06:50,810 --> 00:06:54,080
li barra CS, il-ktejjeb li
konna pprovduti, jekk int

140
00:06:54,080 --> 00:06:57,150
taħseb li tieħu biss CS50,
jew forsi tagħmel sekondarja,

141
00:06:57,150 --> 00:06:59,557
jew forsi anke tikkonċentra
fl CS, do flip permezz ta 'dak.

142
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U tkun taf tara dijagramma
lejn it-tmiem li

143
00:07:01,390 --> 00:07:04,950
turi li inti l-direzzjonijiet differenti ħafna
f'CS li inti tista 'tmur off fil.

144
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>> Iżda għal-lum, aħna ser tiffoka, għal darb'oħra, fuq
verament waħda mill-veduti fundamentali,

145
00:07:09,030 --> 00:07:11,500
forsi, fejn inti għandek
inputs għall-problemi,

146
00:07:11,500 --> 00:07:13,430
għandek outputs mill
problemi, u inti għandek

147
00:07:13,430 --> 00:07:17,420
algoritmi li biex joħolqu
dawk outputs minn dawk l-inputs.

148
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U eżempju wieħed tali, kien ta '
Naturalment, dan il-ktieb tat-telefon hawn.

149
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U aħna użati bħala eżempju biex tmur
permezz ta 'algoritmu li kienet korretta.

150
00:07:24,180 --> 00:07:26,490
U allura wieħed ieħor kien
korrett, iżda ftit aktar mgħaġġel.

151
00:07:26,490 --> 00:07:29,448
U allura wieħed ieħor li kien ftit
aktar drammatika, iżda fundamentalment

152
00:07:29,448 --> 00:07:30,000
aktar mgħaġġel.

153
00:07:30,000 --> 00:07:32,720
>> Dritt, dan phone book aħna
mitluba kienet madwar 1,000 paġni.

154
00:07:32,720 --> 00:07:36,200
U kif ħafna drabi ma I jkollhom
li tiċrita l-ktieb tat-telefon fil nofs

155
00:07:36,200 --> 00:07:39,930
li ssib xi ħadd bħal Mike Smith,
maximally, fil 1,000 ktieb il-paġna?

156
00:07:39,930 --> 00:07:41,040
Allura, 10 jagħtu jew jieħu.

157
00:07:41,040 --> 00:07:45,050
U hekk darba I Tore dan ħaġa fil
nofs, jew sempliċiment, aktar maturely,

158
00:07:45,050 --> 00:07:48,490
maqsum min-nofs, huwa biss
10 paġni minn 1,000.

159
00:07:48,490 --> 00:07:51,470
U jekk inti testrapola, ftit
anormalment għal ktieb tat-telefon,

160
00:07:51,470 --> 00:07:56,540
imma jekk dan il-ktieb tat-telefon kellhom xi 4
biljun paġni fiha, hekk kompletament

161
00:07:56,540 --> 00:07:59,680
dens fiżikament, kemm
ħinijiet do inti taqsam 4 biljuni

162
00:07:59,680 --> 00:08:01,460
paġna phone book fil nofs?

163
00:08:01,460 --> 00:08:03,035
Allura huwa attwalment 32, jagħtu jew jieħu.

164
00:08:03,035 --> 00:08:07,090
U hekk 32 drabi biss, barra
ta 4 biljun paġni, tista

165
00:08:07,090 --> 00:08:08,700
issib xi ħadd bħal Mike Smith.

166
00:08:08,700 --> 00:08:09,740
U li l-effiċjenza.

167
00:08:09,740 --> 00:08:12,130
Li l-algoritmu tajba, daresay.

168
00:08:12,130 --> 00:08:14,480
>> Imma allura aħna mċaqalqa minn dik
li jippruvaw biex tifformalizza dan.

169
00:08:14,480 --> 00:08:16,100
U jien propost dan il-kodiċi pseudocode.

170
00:08:16,100 --> 00:08:17,800
Kodiċi pseudocode mhix xejn formali.

171
00:08:17,800 --> 00:08:18,880
Mhuwiex xi ħaġa li għandek memorize.

172
00:08:18,880 --> 00:08:21,588
Huwa biss xi ħaġa inti tesprimi
pjuttost intuwittivament jużaw Ingliż,

173
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jew kwalunkwe lingwa verament, li
twassal l-ideat tiegħek konċiż.

174
00:08:24,990 --> 00:08:26,990
Imma x'hemm ewlieni dwar
kodiċi pseudocode huwa li inti

175
00:08:26,990 --> 00:08:30,331
tipprova tantiċipa kollha ta 'l-
każijiet possibbli li jista 'jiġri.

176
00:08:30,331 --> 00:08:33,080
U fil-fatt, f'dan il-pseudocode
kodiċi, kien hemm verament tliet każijiet

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00:08:33,080 --> 00:08:34,700
kull darba I maqsuma l-ktieb tat-telefon.

178
00:08:34,700 --> 00:08:36,006
Mike jista 'jkun lejn ix-xellug.

179
00:08:36,006 --> 00:08:37,130
Mike jista 'jkun lejn il-lemin.

180
00:08:37,130 --> 00:08:39,240
Jew hu jista 'jkun dritt fuq il-paġna jien fuq.

181
00:08:39,240 --> 00:08:42,110
Jew f'kawża kantuniera, biex ngħidu hekk.

182
00:08:42,110 --> 00:08:46,470
Xenarju bad jista 'jkun wieħed
which-- dak li qed jiġri?

183
00:08:46,470 --> 00:08:48,860
Mike biss mhux fl
l-ktieb tat-telefon fil-livelli kollha.

184
00:08:48,860 --> 00:08:52,720
>> U meta programmi crash-- meta Mac
u PC software li inti guys run

185
00:08:52,720 --> 00:08:56,400
fuq il-kompjuters tiegħek kultant
prekarja jew quits għarrieda,

186
00:08:56,400 --> 00:08:59,770
li ġeneralment ifisser li xi
programmer, xi bniedem bħalek hekk,

187
00:08:59,770 --> 00:09:01,650
biss invitat up u għamel xi żball.

188
00:09:01,650 --> 00:09:05,207
Forsi ma kinitx tantiċipa li forsi hemm
ebda Mike Smith fil-ktieb tat-telefon.

189
00:09:05,207 --> 00:09:08,040
U jekk inti ma attwalment jiktbu
kodiċi li jimmaniġġjaw sitwazzjonijiet bħal dik,

190
00:09:08,040 --> 00:09:09,890
ġeneralment imprevedibbli
affarijiet jista 'jiġri.

191
00:09:09,890 --> 00:09:10,960
Magna tiegħek jistgħu jiffriżaw.

192
00:09:10,960 --> 00:09:11,730
Hija tista 'reboot.

193
00:09:11,730 --> 00:09:12,889
Il-programm jista nieqaf.

194
00:09:12,889 --> 00:09:14,722
U hekk dawn kollha
stupidities li inti tista '

195
00:09:14,722 --> 00:09:18,030
ikunu ltaqgħu magħhom fl attwali tiegħek
ħajja biss jużaw il-kompjuters,

196
00:09:18,030 --> 00:09:20,710
dejjem se jkun biss
spjegat bogħod minn dan intuition

197
00:09:20,710 --> 00:09:24,920
u dan il-fehim ta 'x'inhu
attwalment għaddejjin taħt il-barnuża.

198
00:09:24,920 --> 00:09:27,329
>> Issa ejja jippruvaw jieħdu ħarsa
fi problema aktar ġenerali.

199
00:09:27,329 --> 00:09:29,120
Pjuttost milli tieħu
attendenza f'post bħal

200
00:09:29,120 --> 00:09:32,230
dan, li għandu jkun pjuttost kajman
biex jagħmlu waħda, tnejn, tlieta, erbgħa.

201
00:09:32,230 --> 00:09:34,070
Jew forsi tnejn, erba, sitta, tmienja.

202
00:09:34,070 --> 00:09:36,080
Ejja tiffoka, minflok, fuq
kif nistgħu jifformalizzaw

203
00:09:36,080 --> 00:09:39,400
l-algoritmu tal-proċess mill-
li aħna nkunu nistgħu nieħdu attendenza.

204
00:09:39,400 --> 00:09:42,290
U tul it-triq, ejja nibdew
biex japplikaw xi nomenklatura

205
00:09:42,290 --> 00:09:47,130
li aħna ser tuża llum meta aħna attwalment
jibdew programmar f'lingwa.

206
00:09:47,130 --> 00:09:50,910
So I jagħtuk issa, video erba 'minuti
li aħna jitqiegħdu flimkien mal-ħbieb tagħna

207
00:09:50,910 --> 00:09:52,820
mill TED, l-organizzazzjoni.

208
00:09:52,820 --> 00:09:56,380
Li biha aħna fornuti b'kitba u
huma miġjuba animaturi tagħhom tbati,

209
00:09:56,380 --> 00:10:00,970
u fil-fatt ħolqot 2D
animazzjoni ta 'dak algoritmu huwa.

210
00:10:00,970 --> 00:10:02,776
Jekk nistgħu dim-dwal.

211
00:10:02,776 --> 00:10:06,664
>> [Daqq ta mużika]

212
00:10:06,664 --> 00:10:17,890

213
00:10:17,890 --> 00:10:19,140
Narrator: X'hemm algoritmu?

214
00:10:19,140 --> 00:10:21,620
Fix-xjenza tal-kompjuter,
algoriżmu huwa sett

215
00:10:21,620 --> 00:10:24,840
ta 'struzzjonijiet solvuti
xi-pass-pass problema.

216
00:10:24,840 --> 00:10:27,310
Tipikament, algoritmi huma
esegwiti minn kompjuters,

217
00:10:27,310 --> 00:10:29,365
iżda aħna bnedmin għandna algoritmi ukoll.

218
00:10:29,365 --> 00:10:31,240
Per eżempju, kif kieku
inti tmur dwar għadd

219
00:10:31,240 --> 00:10:32,990
in-numru ta 'nies fil-kamra?

220
00:10:32,990 --> 00:10:36,840
Ukoll, jekk int simili me, youd probabilment
punt f'kull persuna waħda f'ħin wieħed

221
00:10:36,840 --> 00:10:38,370
u l-għadd up minn żero.

222
00:10:38,370 --> 00:10:41,200
Wieħed, tnejn, tlieta, erba ', u ibqa' sejjer hekk.

223
00:10:41,200 --> 00:10:42,410
Ukoll, li algoritmu.

224
00:10:42,410 --> 00:10:45,820
Fil-fatt, ejja jippruvaw jesprimu hu
daqsxejn aktar formalment kodiċi pseudocode.

225
00:10:45,820 --> 00:10:48,940
Sintassi Ingliż-bħal dik
tixbaħ lingwa ta 'programmar.

226
00:10:48,940 --> 00:10:50,880
>> Ħalli n ugwali 0.

227
00:10:50,880 --> 00:10:55,210
Għal kull persuna fil-kamra,
sett n ugwali għal n plus 1.

228
00:10:55,210 --> 00:10:56,790
Kif tinterpreta l-pseudocode?

229
00:10:56,790 --> 00:10:59,490
Well linja waħda jiddikjara,
biex ngħidu hekk, varjabbli

230
00:10:59,490 --> 00:11:02,880
imsejħa n u initializes
valur tiegħu għal 0 Dan biss

231
00:11:02,880 --> 00:11:05,080
ifisser li fil-
bidu ta 'algoritmu tagħna,

232
00:11:05,080 --> 00:11:07,910
il-ħaġa li aħna qed
għadd għandu valur ta '0.

233
00:11:07,910 --> 00:11:10,860
Wara kollox, qabel nibdew għadd
aħna ma jingħaddx xejn s'issa.

234
00:11:10,860 --> 00:11:13,580
Sejħat dan il-varjabbli
n huwa biss konvenzjoni.

235
00:11:13,580 --> 00:11:15,130
I setgħet sejħitilha xejn aktar.

236
00:11:15,130 --> 00:11:17,460
Issa linja żewġ demarks
l-bidu ta 'loop,

237
00:11:17,460 --> 00:11:20,550
sekwenza ta 'passi li se
jirrepetu xi numru ta 'drabi.

238
00:11:20,550 --> 00:11:24,130
Għalhekk fl-eżempju tagħna, il-pass aħna qed
teħid qed isserraħ nies fil-kamra.

239
00:11:24,130 --> 00:11:26,260
Taħt linja tnejn huwa linja
tlieta li jiddeskrivi

240
00:11:26,260 --> 00:11:28,400
eżattament kif aħna ser tmur dwar għadd.

241
00:11:28,400 --> 00:11:31,720
Il indentazzjoni jimplika li
huwa linja tlieta li se jirrepeti.

242
00:11:31,720 --> 00:11:35,190
Allura bil-kodiċi pseudocode hija
qal hu li wara li jibdew minn 0

243
00:11:35,190 --> 00:11:38,940
għal kull persuna fil-
kamra aħna ser iżidu n b'1

244
00:11:38,940 --> 00:11:41,310
Issa dan huwa algoritmu korretta?

245
00:11:41,310 --> 00:11:42,820
Well ejja bang fuq hija daqsxejn.

246
00:11:42,820 --> 00:11:45,520
>> Taħdem jekk ikun hemm
żewġ persuni fil-kamra?

247
00:11:45,520 --> 00:11:46,420
Ejja naraw.

248
00:11:46,420 --> 00:11:48,500
Fl linja waħda aħna initialize n għal 0.

249
00:11:48,500 --> 00:11:51,910
Għal kull wieħed minn dawn iż-żewġ persuni,
aħna mbagħad inkrement n b'1.

250
00:11:51,910 --> 00:11:55,570
Għalhekk fl-ewwel vjaġġ permezz tal-
loop, aħna aġġornament n 0-1.

251
00:11:55,570 --> 00:11:59,320
Fuq it-tieni vjaġġ permezz ta 'dak
istess loop, aħna aġġornament n 1-2.

252
00:11:59,320 --> 00:12:02,850
U għalhekk, minn din tal algoritmu
aħħar, n huwa 2, li

253
00:12:02,850 --> 00:12:04,950
tabilħaqq jaqbel man-numru
ta 'nies fil-kamra.

254
00:12:04,950 --> 00:12:06,040
S'issa, hekk tajjeb.

255
00:12:06,040 --> 00:12:07,870
>> Kif dwar il-każ kantuniera għalkemm?

256
00:12:07,870 --> 00:12:11,090
Ejja ngħidu li hemm 0 nies
fil-room-- minbarra me, li l-

257
00:12:11,090 --> 00:12:12,420
tagħmel għadd.

258
00:12:12,420 --> 00:12:15,380
F'linja waħda, aħna napprovaw initialize n għal 0.

259
00:12:15,380 --> 00:12:17,810
Din id-darba għalkemm, linja
tlieta ma jeżegwixxix fil-livelli kollha

260
00:12:17,810 --> 00:12:19,610
peress li ma hemmx persuna fil-kamra.

261
00:12:19,610 --> 00:12:23,540
U hekk n tibqa 0, li tabilħaqq logħbiet
in-numru ta 'nies fil-kamra.

262
00:12:23,540 --> 00:12:24,670
Pretty sempliċi, id-dritt?

263
00:12:24,670 --> 00:12:27,880
Iżda għadd poplu wieħed fi żmien
hija pjuttost ineffiċjenti, wisq, l-ebda?

264
00:12:27,880 --> 00:12:29,160
Żgur nistgħu nagħmlu aħjar.

265
00:12:29,160 --> 00:12:33,440
Għaliex ma jgħoddux żewġ persuni fi żmien,
minflok għadd wieħed, tnejn, tlieta,

266
00:12:33,440 --> 00:12:36,470
erba ', ħames, sitt, seba',
tmienja, u ibqa 'sejjer hekk.

267
00:12:36,470 --> 00:12:39,106
Għaliex ma jgħoddux tnejn, erba,
sitta, tmienja, u l-bqija?

268
00:12:39,106 --> 00:12:40,670
Huwa anki ħsejjes malajr.

269
00:12:40,670 --> 00:12:41,940
U huwa żgur huwa.

270
00:12:41,940 --> 00:12:44,490
>> Ejja tesprimi din ottimizzazzjoni
fil-kodiċi pseudocode.

271
00:12:44,490 --> 00:12:46,040
Ħalli n ugwali 0.

272
00:12:46,040 --> 00:12:50,760
Għal kull par ta 'nies
kamra, sett n ugwali għal n plus 2.

273
00:12:50,760 --> 00:12:52,360
Pretty bidla sempliċi, id-dritt?

274
00:12:52,360 --> 00:12:56,560
Pjuttost milli joqgħod nies wieħed fi żmien,
aħna minflok għadd minnhom tnejn fi żmien.

275
00:12:56,560 --> 00:12:59,240
Tal Dan algoritmu, b'hekk,
darbtejn aktar malajr bħala l-aħħar.

276
00:12:59,240 --> 00:13:00,530
Imma huwa korrett?

277
00:13:00,530 --> 00:13:01,160
Ejja naraw.

278
00:13:01,160 --> 00:13:03,580
Taħdem jekk ikun hemm
żewġ persuni fil-kamra?

279
00:13:03,580 --> 00:13:05,800
F'linja waħda, aħna initialize n għal 0.

280
00:13:05,800 --> 00:13:09,160
Għal dik par wieħed ta 'nies,
aħna mbagħad inkrement n b'2.

281
00:13:09,160 --> 00:13:11,910
U hekk minn tal dan algoritmu
aħħar n huwa 2, li

282
00:13:11,910 --> 00:13:13,910
tabilħaqq jaqbel man-numru
ta 'nies fil-kamra.

283
00:13:13,910 --> 00:13:16,610
>> Ejja ngħidu li jmiss li hemm
żero nies fil-kamra.

284
00:13:16,610 --> 00:13:19,080
Fl linja waħda aħna initialize n għal 0.

285
00:13:19,080 --> 00:13:21,260
Bħal qabel, linja tlieta
ma jeżegwixxix dan kollu

286
00:13:21,260 --> 00:13:25,270
peress ma jkunx hemm xi pari ta 'nies
fil-kamra, u għalhekk n tibqa 0.

287
00:13:25,270 --> 00:13:27,840
Liema tabilħaqq jaqbel mal-
numru ta 'nies fil-kamra.

288
00:13:27,840 --> 00:13:30,520
Imma x'jiġri jekk ikun hemm
tliet persuni fil-kamra?

289
00:13:30,520 --> 00:13:32,380
Kif jaħdem dan nol algoritmu?

290
00:13:32,380 --> 00:13:35,710
Ejja naraw, f'linja waħda,
aħna initialize n għal 0.

291
00:13:35,710 --> 00:13:39,140
Għal par ta 'dawk in-nies,
aħna mbagħad inkrement n b'2.

292
00:13:39,140 --> 00:13:40,050
Imma allura dak?

293
00:13:40,050 --> 00:13:42,340
Ma jkunx hemm ieħor full
par ta 'nies fil-kamra,

294
00:13:42,340 --> 00:13:44,430
hekk line tnejn m'għadux japplika.

295
00:13:44,430 --> 00:13:48,790
U hekk sa tmiem dan algoritmu, il-
n għadu 2 li mhijiex korretta.

296
00:13:48,790 --> 00:13:52,070
Tabilħaqq tal dan algoritmu qal li
tkun Buggy minħabba li għandu żball.

297
00:13:52,070 --> 00:13:54,070
>> Ejja rimedju ma 'xi
kodiċi pseudocode ġdid.

298
00:13:54,070 --> 00:13:56,110
Ħalli n ugwali 0.

299
00:13:56,110 --> 00:14:00,790
Għal kull par ta 'nies
kamra, sett N ugwali għal n plus 2.

300
00:14:00,790 --> 00:14:05,410
Jekk persuna waħda tibqa abbinata,
sett N ugwali għal n plus 1.

301
00:14:05,410 --> 00:14:09,340
Biex issolvi din il-problema partikolari, konna
introdotti fil-linja erbgħa f'kondizzjoni,

302
00:14:09,340 --> 00:14:12,120
inkella magħruf bħala
fergħa, li tesegwixxi

303
00:14:12,120 --> 00:14:14,890
jekk hemm persuna waħda aħna
ma setgħux par ma 'ieħor.

304
00:14:14,890 --> 00:14:17,140
U hekk issa, jekk
hemm waħda, jew tlieta,

305
00:14:17,140 --> 00:14:21,550
jew kwalunkwe numru fard ta 'nies fil-kamra,
dan algoritmu issa se jgħoddu għalihom.

306
00:14:21,550 --> 00:14:22,810
Nistgħu nagħmlu anke aħjar?

307
00:14:22,810 --> 00:14:25,890
Well, nistgħu għadd f'għadd ta 'tlieta,
jew fours, jew saħansitra livell ta 'għajxien u għexieren,

308
00:14:25,890 --> 00:14:29,390
imma lil hinn minn dak, li għaddej biex tikseb
diffiċli ftit għall-punt.

309
00:14:29,390 --> 00:14:32,900
>> Fl-aħħar tal-ġurnata, kemm jekk
esegwiti minn kompjuters jew bnedmin,

310
00:14:32,900 --> 00:14:34,870
algoritmi huma biss
sett ta 'struzzjonijiet

311
00:14:34,870 --> 00:14:36,560
li biex isolvu problemi.

312
00:14:36,560 --> 00:14:38,360
Dawn kienu biss tlieta.

313
00:14:38,360 --> 00:14:41,860
Liema problema kieku inti
issolvi ma 'algoritmu?

314
00:14:41,860 --> 00:14:44,261
>> DAVID J. Malan: Allura deliberatament,
programm sempliċi ħafna,

315
00:14:44,261 --> 00:14:46,260
algoritmu sempliċi ħafna,
għall-kisba xi ħaġa

316
00:14:46,260 --> 00:14:48,280
sempliċi ħafna, għadd tal-
numru ta 'nies fil-kamra.

317
00:14:48,280 --> 00:14:50,370
>> Imma ejja tease apparti
xi wħud mill-rappreżentant

318
00:14:50,370 --> 00:14:52,870
karatteristiċi hawnhekk li huma attwalment
ser ikunu utli anki meta

319
00:14:52,870 --> 00:14:54,880
implimentazzjoni l-aktar
kumplessa ta 'software.

320
00:14:54,880 --> 00:14:58,060
Allura per eżempju, f'dan l-ewwel linja,
għandna nsejħu l-varjabbli,

321
00:14:58,060 --> 00:15:01,040
u minn alġebra, int
ġeneralment familjari jużaw xuy

322
00:15:01,040 --> 00:15:02,930
u z kultant, u ibqa 'sejjer hekk.

323
00:15:02,930 --> 00:15:05,770
Iżda fil-programmazzjoni, varjabbli
għadhom, fl-aħħar tal-ġurnata,

324
00:15:05,770 --> 00:15:06,680
simili ħafna għal dak.

325
00:15:06,680 --> 00:15:09,910
Iżda huwa forsi aktar sempliċi biex jaħsbu
ta 'varjabbli biss bħala kontenitur.

326
00:15:09,910 --> 00:15:13,520
U, fil-fatt, huwa xi numru ta 'bits
implimentat b'xi fil-hard disk tiegħek

327
00:15:13,520 --> 00:15:16,410
jew fil-memorja tal-kompjuter tiegħek,
iżda aktar fuq li fil-futur.

328
00:15:16,410 --> 00:15:17,670
Huwa biss kontenitur.

329
00:15:17,670 --> 00:15:20,310
U jekk inti tgħidli xi ħaġa
bħall let n ugwali 0,

330
00:15:20,310 --> 00:15:24,310
Ukoll li bħal ssejjaħ dan il-ħġieġ
skutella hawn n, biss isem arbitrarja,

331
00:15:24,310 --> 00:15:26,230
u t-tqegħid xejn inizjalment.

332
00:15:26,230 --> 00:15:28,940
Allura l-valur ta 'dan
bowl dritt issa huwa żero.

333
00:15:28,940 --> 00:15:31,380
U ovvjament jekk inti jipperċepixxu
fil-linja sussegwenti,

334
00:15:31,380 --> 00:15:35,070
li attwalment inkrement xi linja ta '
kodiċi, bħal f'dan il-tielet linja hawn,

335
00:15:35,070 --> 00:15:39,857
minn 1, dan huwa simili qal x'inhu l-
valur kurrenti ta 'n, li għamilhom 0, flimkien ma' 1,

336
00:15:39,857 --> 00:15:41,690
tpoġġi xi ħaġa bħal
ping pong ball fil hawn.

337
00:15:41,690 --> 00:15:45,140
Issa l-valur ta 'dan
varjabbli hija sempliċement 1.

338
00:15:45,140 --> 00:15:50,064
U inti tista 'malajr ħafna estrapolati,
iżda issa huwa 2, issa huwa 3, u l-bqija.

339
00:15:50,064 --> 00:15:51,230
Allura li kollox varjabbli huwa.

340
00:15:51,230 --> 00:15:53,740
Huwa biċċa ta 'ħażna
attwalment jaħżnu xi data.

341
00:15:53,740 --> 00:15:55,050
Għal issa huwa ballun pong ping.

342
00:15:55,050 --> 00:15:55,883
Hemm huwa numru.

343
00:15:55,883 --> 00:15:58,910
Iżda jista 'jkun kliem fil-
dizzjunarju, bħall-jespliċitaw kontrollur

344
00:15:58,910 --> 00:16:02,300
I allużjoni għall nhar l-Erbgħa għall-
wieħed ta 'settijiet problema sena li għaddiet.

345
00:16:02,300 --> 00:16:05,640
>> Issa ieħor idea ewlenija, li bl-istess mod
hija pjuttost intuwittivi I ser jargumenta,

346
00:16:05,640 --> 00:16:06,690
huwa dak ta 'loop.

347
00:16:06,690 --> 00:16:08,930
U l-linja fil-proċess
ta 'kif jingħaddu kulħadd

348
00:16:08,930 --> 00:16:12,540
huwa, ovvjament, tagħmel l-istess
Ħaġa darb'oħra u again-- jew wieħed

349
00:16:12,540 --> 00:16:14,140
fi żmien jew tnejn fi żmien.

350
00:16:14,140 --> 00:16:17,690
U inti tista 'tesprimi din bl-Ingliż, jew
kodiċi pseudocode, fi kwalunkwe numru ta 'modi,

351
00:16:17,690 --> 00:16:21,560
iżda bl-użu dan prepożizzjoni "għal"
huwa mod komuni ħafna ta 'kif isir dan.

352
00:16:21,560 --> 00:16:24,460
Għal kull persuna fil-kamra, jagħmlu dan.

353
00:16:24,460 --> 00:16:25,350
Għal darb'oħra u għal darb'oħra.

354
00:16:25,350 --> 00:16:27,700
U l-fatt li huwa
indentata, linja tlieta,

355
00:16:27,700 --> 00:16:29,840
ifisser biss li dak
int suppost tagħmel

356
00:16:29,840 --> 00:16:33,490
hija l-għalf thats inċiża
taħt il-linja tnejn innifsu.

357
00:16:33,490 --> 00:16:35,590
Just konvenzjoni tal-bniedem,
iżda waħda komuni

358
00:16:35,590 --> 00:16:39,010
kif aħna ser tara fil ogħla attwali
lingwi ta 'programmar livell.

359
00:16:39,010 --> 00:16:41,870
>> Issa ftit aktar interessanti hija
meta ikollok fil-każ kantuniera.

360
00:16:41,870 --> 00:16:43,970
Per eżempju, kantuniera
każ kien meta hemm

361
00:16:43,970 --> 00:16:48,060
kienu tliet persuni, jew ħamsa, jew seba ',
jew kwalunkwe numru fard ta 'nies fil-kamra,

362
00:16:48,060 --> 00:16:51,630
għaliex tagħmel dan billi brejkijiet twos
eventwalment minħabba tiegħek tmur

363
00:16:51,630 --> 00:16:54,265
titlifx xi ħadd, jew fil-
bidu nett jew it-tmiem ħafna

364
00:16:54,265 --> 00:16:55,390
jiddependi fuq kif inti tagħmel dan.

365
00:16:55,390 --> 00:16:59,800
U għalhekk, issa, għandi din il-fergħa, jew
kundizzjoni, jekk persuna waħda tibqa,

366
00:16:59,800 --> 00:17:04,490
imbagħad imorru quddiem u jimmaniġġjaw li wieħed
persuna lonesome li ma jiksbu

367
00:17:04,490 --> 00:17:05,690
paired ma 'xi ħadd ieħor.

368
00:17:05,690 --> 00:17:09,030
Allura dak hu li aħna kieku ssejjaħ
kundizzjoni, jew fergħa.

369
00:17:09,030 --> 00:17:11,500
>> Kodiċi Issa pseudocode
b'mod aktar ġenerali jista 'jkun

370
00:17:11,500 --> 00:17:13,730
miktub sabiex issolvi kwalunkwe numru ta 'problemi.

371
00:17:13,730 --> 00:17:16,490
U dak li ħsibt aħna'd
nagħmlu hawnhekk huwa li tieħu mument

372
00:17:16,490 --> 00:17:20,089
li jistiednu nistgħu ngħidu li CS50
stess Rob Bowden fuq il-palk

373
00:17:20,089 --> 00:17:25,040
li jiġu magħqudin b'żewġ voluntiera,
li jkollhom l-ebda idea dak li jistenna.

374
00:17:25,040 --> 00:17:26,890
A idejn niżlet malli I qal li.

375
00:17:26,890 --> 00:17:28,700
Kif dwarek fuq il-
jieqafx hawn, come fuq up.

376
00:17:28,700 --> 00:17:33,040
U kif madwar minn farther
bogħod, kif madwar mod fil-dahar.

377
00:17:33,040 --> 00:17:35,200
Lura ringiela, come fuq up bl-idejn tiegħek up.

378
00:17:35,200 --> 00:17:36,475
Alright, u x'hemm isem tiegħek?

379
00:17:36,475 --> 00:17:36,960
>> ANITA: Anita.

380
00:17:36,960 --> 00:17:37,655
>> DAVID J. Malan: Anita.

381
00:17:37,655 --> 00:17:38,613
Okay, sbieħ li jissodisfaw inti.

382
00:17:38,613 --> 00:17:41,010
Let me jintroduċu inti Rob Bowden.

383
00:17:41,010 --> 00:17:42,890
Dan huwa Anita.

384
00:17:42,890 --> 00:17:44,033
U dak huwa l-isem tiegħek?

385
00:17:44,033 --> 00:17:44,800
>> KIERSTEN: Kiersten

386
00:17:44,800 --> 00:17:46,020
>> DAVID J. Malan: Kiersten.

387
00:17:46,020 --> 00:17:49,790
Kiersten, come fuq up u
jilħqu Rob Bowden u Anita.

388
00:17:49,790 --> 00:17:51,036
Nizza li jissodisfaw inti.

389
00:17:51,036 --> 00:17:52,160
KIERSTEN: Nizza li jissodisfaw inti.

390
00:17:52,160 --> 00:17:53,368
DAVID J. Malan: Alright, Rob.

391
00:17:53,368 --> 00:17:54,650
ROB Bowden: Nizza li jissodisfaw inti.

392
00:17:54,650 --> 00:17:55,566
DAVID J. Malan: Anita.

393
00:17:55,566 --> 00:17:56,520
KIERSTEN: Hi Anita.

394
00:17:56,520 --> 00:17:58,686
DAVID J. Malan: U tiegħek
diversi mijiet klassi.

395
00:17:58,686 --> 00:18:02,490
Allura, issa let me imorru quddiem u iġbed
up biss sempliċi program hawn

396
00:18:02,490 --> 00:18:05,690
fuq Mac OS li ser let me
attwalment LOGHOME xi noti isfel.

397
00:18:05,690 --> 00:18:09,570
U jekk inti guys tixtieq li kull tieħu
pożizzjoni fuq waħda minn dawk l-iskejjel hemmhekk,

398
00:18:09,570 --> 00:18:16,360
let me imorru quddiem u tibda lista
tal-kodiċi pseudocode, jekk inti se.

399
00:18:16,360 --> 00:18:19,970
U dak li nixtieq li nagħmlu hawnhekk,
finalment, huwa tip għalik

400
00:18:19,970 --> 00:18:22,470
xi struzzjonijiet li tagħna
membri tal-udjenza huma attwalment

401
00:18:22,470 --> 00:18:23,569
ser recite għalina.

402
00:18:23,569 --> 00:18:25,860
Let me imorru quddiem u biss
tbiddel dan għal lista nnumerati

403
00:18:25,860 --> 00:18:27,720
biex jaqblu ma 'dak li aħna kienu qed jagħmlu up hemm.

404
00:18:27,720 --> 00:18:30,990
U dak li jien ser tagħmel ma
għajnuna tiegħek, huwa jikteb programm

405
00:18:30,990 --> 00:18:34,620
fil pseudocode, li magħhom
dawn guys huma għaddejjin

406
00:18:34,620 --> 00:18:38,150
biex timplimenta karawett
butir u sandwich jelly.

407
00:18:38,150 --> 00:18:40,880
Allura huwa forsi apropos li
juru xi ħaġa xi wħud minnkom

408
00:18:40,880 --> 00:18:44,560
tista raw fuq l-internet
għal ftit mument annoying qasira.

409
00:18:44,560 --> 00:18:47,650
>> [MUSIC BUCKEWHEAT BOYS, "butir tal-karawett
 JELLY TIME "]

410
00:18:47,650 --> 00:19:08,119

411
00:19:08,119 --> 00:19:08,910
DAVID J. Malan: OK.

412
00:19:08,910 --> 00:19:10,050
C'est biżżejjed ta 'dak.

413
00:19:10,050 --> 00:19:12,690
Allura hawnhekk sadanittant, I jkollhom
par ta 'Google Nuċċali li

414
00:19:12,690 --> 00:19:16,500
aħna ser jitqiegħdu fuq stess Rob Bowden CS50 tal
biex tara d-dinja permezz ta 'għajnejn tiegħu.

415
00:19:16,500 --> 00:19:19,140
U aħna ser nagħmlu l-almu tagħna fil-kariga
produzzjoni li attwalment nisġa

416
00:19:19,140 --> 00:19:23,100
l-footage ta 'dak Rob huwa jara
issa, fis dan lecture attwali

417
00:19:23,100 --> 00:19:26,420
video b'żewġ tagħna
voluntiera ħdejn lilu.

418
00:19:26,420 --> 00:19:28,480
Allura dak li jien ser tagħmel
huwa, I ser tkun l-shorthand.

419
00:19:28,480 --> 00:19:31,849
Għandna l-għan hawnhekk ta '
attwalment kitba ta 'programm

420
00:19:31,849 --> 00:19:34,640
li biex jagħmlu, finalment, ta '
butir tal-karawett u sandwich jelly,

421
00:19:34,640 --> 00:19:37,680
iżda dawn it-tliet huma ser jaġixxu
daqslikieku huma kompjuters.

422
00:19:37,680 --> 00:19:40,638
U kompjuters, fl-aħħar tal-ġurnata,
huma attwalment apparati pretty mutu.

423
00:19:40,638 --> 00:19:44,432
Huma qed super fast, iżda jistgħu biss
do, litteralment, dak li huma told.

424
00:19:44,432 --> 00:19:46,890
Inti ma tistax biss jgħidu tagħmel karawett
butir u sandwich jelly.

425
00:19:46,890 --> 00:19:48,640
Inti għandek għall-programm biex tagħmel dan.

426
00:19:48,640 --> 00:19:51,420
Int għandek jgħidulhom
bi preċiżjoni dak li tagħmel,

427
00:19:51,420 --> 00:19:54,400
inqas l-affarijiet imorru horribly u,
nisperaw, divertenti awry.

428
00:19:54,400 --> 00:19:57,460
>> Allura ma 'dak imsemmi, għandna bżonn
sejħa waħda-out mill-udjenza

429
00:19:57,460 --> 00:19:59,440
għal dak għandha żżid
waħda tkun, jekk l-għan hawnhekk

430
00:19:59,440 --> 00:20:01,356
huwa li tagħmel karawett
butir u sandwich jelly.

431
00:20:01,356 --> 00:20:01,910
Iva?

432
00:20:01,910 --> 00:20:03,647
>> UDJENZA: [inaudible] l-borża ta 'ħobż.

433
00:20:03,647 --> 00:20:05,230
DAVID J. Malan: Iftaħ il-borża ta 'ħobż.

434
00:20:05,230 --> 00:20:08,360
Mela jekk it-tliet kontestanti kieku
tixtieq li tipproċedi sabiex tagħmel dan litteralment.

435
00:20:08,360 --> 00:20:12,394
Iftaħ il-borża ta 'ħobż.

436
00:20:12,394 --> 00:20:15,810
>> [UDJENZA Laughing]

437
00:20:15,810 --> 00:20:20,717

438
00:20:20,717 --> 00:20:22,300
DAVID J. Malan: Mela ejja jaħdmu fuq dan.

439
00:20:22,300 --> 00:20:23,180
Kull dritt.

440
00:20:23,180 --> 00:20:25,400
Allura pass tnejn, how--
ejja tieħu din ulterjuri.

441
00:20:25,400 --> 00:20:26,480
Yeah, fl-quddiem.

442
00:20:26,480 --> 00:20:27,240
>> UDJENZA: [inaudible] il-ħobż.

443
00:20:27,240 --> 00:20:27,735
>> DAVID J. Malan: X'hemm li?

444
00:20:27,735 --> 00:20:28,836
>> UDJENZA: Neħħi l-ħobż.

445
00:20:28,836 --> 00:20:30,210
DAVID J. Malan: Neħħi l-ħobż.

446
00:20:30,210 --> 00:20:31,190
Bl-istess mod konċiż.

447
00:20:31,190 --> 00:20:33,667
Grazzi.

448
00:20:33,667 --> 00:20:43,777
>> [Applause]

449
00:20:43,777 --> 00:20:44,860
DAVID J. Malan: Li dan?

450
00:20:44,860 --> 00:20:48,830
OK, hekk pass tnejn qed jiġri
li tkun tneħħi l-ħobż.

451
00:20:48,830 --> 00:20:51,790
Alright, xi ħadd tixtieq li
tikteb lilna sentenza itwal?

452
00:20:51,790 --> 00:20:52,640
Xi ħadd ieħor?

453
00:20:52,640 --> 00:20:53,920
A ftit aktar [inaudible].

454
00:20:53,920 --> 00:20:54,810
Le, xejn issa.

455
00:20:54,810 --> 00:20:56,094
Iva?

456
00:20:56,094 --> 00:20:58,900
>> UDJENZA: Post tnejn
flieli ħdejn xulxin.

457
00:20:58,900 --> 00:21:03,575
>> DAVID J. Malan: Post tnejn
flieli ħdejn xulxin.

458
00:21:03,575 --> 00:21:06,420
>> [UDJENZA Laughing]

459
00:21:06,420 --> 00:21:09,590
>> DAVID J. Malan: Post tnejn
flieli ħdejn xulxin.

460
00:21:09,590 --> 00:21:11,334
Pass erbgħa.

461
00:21:11,334 --> 00:21:12,816
Iva?

462
00:21:12,816 --> 00:21:14,792
>> UDJENZA: Ħu tiegħek
idejn u sett huwa ħafif

463
00:21:14,792 --> 00:21:17,756
fuq quċċata ta 'l-għatu butir tal-karawett.

464
00:21:17,756 --> 00:21:19,710
>> [UDJENZA Laughing]

465
00:21:19,710 --> 00:21:21,710
UDJENZA: [inaudible]
li jmiss għall-butir tal-karawett.

466
00:21:21,710 --> 00:21:21,870
DAVID J. Malan: What?

467
00:21:21,870 --> 00:21:22,520
Jgħidu li għal darb'oħra.

468
00:21:22,520 --> 00:21:26,308
>> UDJENZA: Ħoll l-għatu u poġġi
bil-mod li jmiss għall-butir tal-karawett.

469
00:21:26,308 --> 00:21:31,490
>> DAVID J. Malan: Poġġi dan bil-mod
li jmiss għall-butir tal-karawett.

470
00:21:31,490 --> 00:21:37,770

471
00:21:37,770 --> 00:21:40,090
OK, progress.

472
00:21:40,090 --> 00:21:41,080
Pass ħamsa.

473
00:21:41,080 --> 00:21:42,380
Eċċellenti.

474
00:21:42,380 --> 00:21:43,261
Iva?

475
00:21:43,261 --> 00:21:44,163
>> Pick up sikkina.

476
00:21:44,163 --> 00:21:46,380

477
00:21:46,380 --> 00:21:47,630
DAVID J. Malan: Aqbad sikkina.

478
00:21:47,630 --> 00:21:52,320

479
00:21:52,320 --> 00:21:53,631
OK, pass sitta.

480
00:21:53,631 --> 00:21:54,130
Yeah?

481
00:21:54,130 --> 00:21:56,237
>> UDJENZA: Żomm sikkina mill-manku.

482
00:21:56,237 --> 00:21:57,945
DAVID J. Malan: Żomm
sikkina mill-manku.

483
00:21:57,945 --> 00:22:00,710

484
00:22:00,710 --> 00:22:03,230
Żomm sikkina mill-manku.

485
00:22:03,230 --> 00:22:04,880
Pass sebgħa.

486
00:22:04,880 --> 00:22:05,692
Iva?

487
00:22:05,692 --> 00:22:10,030
>> UDJENZA: sikkina [inaudible] fil-karawett
butir u kif ftit barra [inaudible].

488
00:22:10,030 --> 00:22:13,070
>> DAVID J. Malan: Poġġi sikkina in-- I
smajna "sikkina tpoġġi fil-butir tal-karawett

489
00:22:13,070 --> 00:22:19,500
u tieħu bħala ftit barra kemm jista 'jkun. "

490
00:22:19,500 --> 00:22:22,480
Mill-mod, neħħi l-karta l-ewwel.

491
00:22:22,480 --> 00:22:29,320

492
00:22:29,320 --> 00:22:31,890
Kull dritt, pass disa.

493
00:22:31,890 --> 00:22:34,910
Pass disa.

494
00:22:34,910 --> 00:22:35,624
Pass disa.

495
00:22:35,624 --> 00:22:37,290
Aħna ma attwalment magħmula sandwich s'issa.

496
00:22:37,290 --> 00:22:37,790
Iva?

497
00:22:37,790 --> 00:22:41,570
UDJENZA: Bl-użu sikkina fil-butir tal-karawett,
japplikaw butir tal-karawett fuq qal ħobż.

498
00:22:41,570 --> 00:22:47,440
>> DAVID J. Malan: Bl-użu sikkina fl
butir tal-karawett, japplikaw butir tal-karawett fuq

499
00:22:47,440 --> 00:22:48,736
qal ħobż.

500
00:22:48,736 --> 00:22:56,030
>> [UDJENZA Laughing]

501
00:22:56,030 --> 00:22:59,480
DAVID J. Malan: All pass dritt 10.

502
00:22:59,480 --> 00:23:01,762
Pass 10.

503
00:23:01,762 --> 00:23:02,750
Iva?

504
00:23:02,750 --> 00:23:05,220
>> UDJENZA: karawett Togħma
butir biex jiżguraw kwalità.

505
00:23:05,220 --> 00:23:15,960
>> [UDJENZA Laughing]

506
00:23:15,960 --> 00:23:16,960
DAVID J. Malan: Pass 11.

507
00:23:16,960 --> 00:23:19,500

508
00:23:19,500 --> 00:23:21,340
Pass 11.

509
00:23:21,340 --> 00:23:22,101
Pass 11.

510
00:23:22,101 --> 00:23:22,600
Come fuq.

511
00:23:22,600 --> 00:23:23,099
Yeah?

512
00:23:23,099 --> 00:23:24,208
Hemm dritt.

513
00:23:24,208 --> 00:23:25,840
>> UDJENZA: B'attenzjoni pick up jelly.

514
00:23:25,840 --> 00:23:28,220
>> DAVID J. Malan: B'attenzjoni pick up jelly.

515
00:23:28,220 --> 00:23:29,970
OK, u mbagħad idejn ieħor kien sa.

516
00:23:29,970 --> 00:23:32,812

517
00:23:32,812 --> 00:23:33,520
Dritt lura int.

518
00:23:33,520 --> 00:23:35,761
Yeah, bil-blu.

519
00:23:35,761 --> 00:23:40,671
>> UDJENZA: Kull dritt, neħħi
għatu minn [inaudible], yeah,

520
00:23:40,671 --> 00:23:42,635
neħħi l-għatu mill-jelly.

521
00:23:42,635 --> 00:23:43,617
>> [UDJENZA Laughing]

522
00:23:43,617 --> 00:23:44,742
>> DAVID J. Malan: Mill jelly.

523
00:23:44,742 --> 00:23:45,581
Ha ha.

524
00:23:45,581 --> 00:23:48,967
>> [UDJENZA Laughing]

525
00:23:48,967 --> 00:23:49,800
DAVID J. Malan: U?

526
00:23:49,800 --> 00:23:52,490
UDJENZA: U bilkemm
jiknes kwalunkwe [inaudible].

527
00:23:52,490 --> 00:23:59,536
[UDJENZA Laughing]

528
00:23:59,536 --> 00:24:04,456
UDJENZA: Of course, qabel [inaudible],
neħħi l-karta mill jelly.

529
00:24:04,456 --> 00:24:06,940
DAVID J. Malan: Neħħi karta mill jelly.

530
00:24:06,940 --> 00:24:08,229
Pass 14.

531
00:24:08,229 --> 00:24:09,020
Aħna kważi hemm.

532
00:24:09,020 --> 00:24:09,857
Iva?

533
00:24:09,857 --> 00:24:12,600
>> UDJENZA: Aqleb flixkun jelly
qabel kollox jaqa 'barra.

534
00:24:12,600 --> 00:24:16,515
>> DAVID J. Malan: jelly Aqleb
flixkun qabel jelly jaqa 'barra.

535
00:24:16,515 --> 00:24:19,070

536
00:24:19,070 --> 00:24:19,890
Pass 15.

537
00:24:19,890 --> 00:24:21,130
>> UDJENZA: Issostitwixxi l-għatu.

538
00:24:21,130 --> 00:24:22,463
>> DAVID J. Malan: Issostitwixxi l-għatu.

539
00:24:22,463 --> 00:24:25,880

540
00:24:25,880 --> 00:24:28,190
Pass 16.

541
00:24:28,190 --> 00:24:28,931
Yeah?

542
00:24:28,931 --> 00:24:29,806
>> UDJENZA: [inaudible]

543
00:24:29,806 --> 00:24:34,109

544
00:24:34,109 --> 00:24:35,400
DAVID J. Malan: Say li għal darb'oħra.

545
00:24:35,400 --> 00:24:38,100
UDJENZA: Ħu għatu off ta 'jelly tiegħek.

546
00:24:38,100 --> 00:24:39,650
DAVID J. Malan: Off jelly tiegħek.

547
00:24:39,650 --> 00:24:43,720

548
00:24:43,720 --> 00:24:49,510
Allura really-- Oops.

549
00:24:49,510 --> 00:24:50,420
Come fuq.

550
00:24:50,420 --> 00:24:51,740
Issostitwixxi l-għatu.

551
00:24:51,740 --> 00:24:56,660
Poġġi cap-- You qal
Neħħi l-għatu mill-jelly.

552
00:24:56,660 --> 00:24:58,950
Jħossu bħal aħna qed fil-daqsxejn ta 'loop.

553
00:24:58,950 --> 00:24:59,640
Pass 17.

554
00:24:59,640 --> 00:25:00,398
Iva?

555
00:25:00,398 --> 00:25:02,639
>> UDJENZA: [inaudible]

556
00:25:02,639 --> 00:25:03,930
DAVID J. Malan: Say li għal darb'oħra.

557
00:25:03,930 --> 00:25:05,150
UDJENZA: [inaudible]

558
00:25:05,150 --> 00:25:07,835
DAVID J. Malan: Mur lura għall step--

559
00:25:07,835 --> 00:25:10,110
UDJENZA: [inaudible]

560
00:25:10,110 --> 00:25:13,760
DAVID J. Malan: Neħħi
għatu mill-butir tal-karawett.

561
00:25:13,760 --> 00:25:14,492
Iva?

562
00:25:14,492 --> 00:25:16,430
>> UDJENZA: Drop l-
jelly fuq il-ħobż.

563
00:25:16,430 --> 00:25:19,040
>> DAVID J. Malan: Drop kollha
il-jelly fuq il-ħobż.

564
00:25:19,040 --> 00:25:25,372

565
00:25:25,372 --> 00:25:26,830
DAVID J. Malan: Aħna kważi hemm.

566
00:25:26,830 --> 00:25:27,800
Pass 19.

567
00:25:27,800 --> 00:25:30,250
>> UDJENZA: Neħħi jelly żejjed.

568
00:25:30,250 --> 00:25:31,720
>> DAVID J. Malan: Haha, jelly.

569
00:25:31,720 --> 00:25:36,615
>> [Applause]

570
00:25:36,615 --> 00:25:39,240
DAVID J. Malan: Għaliex ma we--
wieħed pass aktar biex jieħu din id-dar.

571
00:25:39,240 --> 00:25:41,720
Wieħed pass aktar u mbagħad
aħna ser iservu sandwiches.

572
00:25:41,720 --> 00:25:42,900
Iva?

573
00:25:42,900 --> 00:25:45,570
>> UDJENZA: [inaudible]

574
00:25:45,570 --> 00:25:50,704
>> DAVID J. Malan: Filwaqt kwalunkwe sandwich
inċiż let remains-- tal this-- jieklu.

575
00:25:50,704 --> 00:25:56,400
>> [Rires UDJENZA]

576
00:25:56,400 --> 00:26:00,395
>> DAVID J. Malan: Kull dritt, nirringrazzja
inti voluntiera tagħna hawn.

577
00:26:00,395 --> 00:26:06,150
>> [Applause}

578
00:26:06,150 --> 00:26:08,940
>> DAVID J. Malan: Għandna xi sympathique
firda rigali għal kull minnkom.

579
00:26:08,940 --> 00:26:14,350
Butir tal-karawett tiegħek, jelly,
u ħobż biex iġibu lura d-dar.

580
00:26:14,350 --> 00:26:15,774
Grazzi.

581
00:26:15,774 --> 00:26:17,118
>> KIERSTEN: Grazzi.

582
00:26:17,118 --> 00:26:18,618
DAVID J. Malan: [inaudible] milqugħa.

583
00:26:18,618 --> 00:26:21,849
[Applause]

584
00:26:21,849 --> 00:26:24,390
DAVID J. Malan: Allura, dan huwa,
Naturalment, eżempju redikoli.

585
00:26:24,390 --> 00:26:24,890
Right?

586
00:26:24,890 --> 00:26:28,890
Iżda dan ma tip ta 'juri kif aħna
bnedmin ħu ċarezza għall mogħtija.

587
00:26:28,890 --> 00:26:30,890
U l-fatt stajt ġiet
tkellem lil bniedem ieħor,

588
00:26:30,890 --> 00:26:33,300
hu jew hi biss jaf dak li jfisser.

589
00:26:33,300 --> 00:26:35,220
>> Kompjuters mhumiex ser
li tkun taf dak li jfisser,

590
00:26:35,220 --> 00:26:37,430
anke meta jużaw, bħala
aħna qed waslu biex jagħmlu llum,

591
00:26:37,430 --> 00:26:42,300
programmazzjoni xi ħaġa fil Scratch, drag
u qatra, lingwa stil biċċa puzzle.

592
00:26:42,300 --> 00:26:44,310
Anke mfassla għall żgħażagħ
tfal, għandek

593
00:26:44,310 --> 00:26:48,726
li jkun hekk espliċitu u hekk litterali ma
dak li trid program tiegħek biex tagħmel.

594
00:26:48,726 --> 00:26:50,600
Issa finalment, aħna qed
ser ikunu programmazzjoni

595
00:26:50,600 --> 00:26:53,550
mhux fil-kodiċi pseudocode,
Ingliż bħall sintassi,

596
00:26:53,550 --> 00:26:56,370
imma kodiċi jew, b'mod aktar xieraq, kodiċi sors.

597
00:26:56,370 --> 00:26:59,260
Kodiċi tas-sors huwa biss il-mod fancy
għad-deskrizzjoni kodiċi inti fil-fatt

598
00:26:59,260 --> 00:27:01,730
jiktbu bil-keyboard li l-
mhux bl-Ingliż per se.

599
00:27:01,730 --> 00:27:06,480
Huwa fis-C jew Java jew C ++ jew xi ħaġa
bħal dik, kif aħna ser dalwaqt tara.

600
00:27:06,480 --> 00:27:09,510
>> U fil-fatt, biss biex biża ta '
Ftit tal inti, ewwel daqqa t'għajn,

601
00:27:09,510 --> 00:27:13,769
dan huwa programm miktub f'lingwa
imsejħa C. Iżda biex un-biża ftit tal inti,

602
00:27:13,769 --> 00:27:15,560
inti se kompletament
jifhmu x'inhu għaddej

603
00:27:15,560 --> 00:27:18,980
fuq come Tnejn li jmiss meta
niġu għal xi ħaġa bħal din.

604
00:27:18,980 --> 00:27:20,510
Franchement, dan huwa lingwa anzjani.

605
00:27:20,510 --> 00:27:22,430
Huwa pjuttost arcane,
imma hija rappreżentattiva

606
00:27:22,430 --> 00:27:26,120
ta 'lott ta' lingwi dawn il-jiem li
jkollhom lottijiet ta 'parentesi u kaboċċi

607
00:27:26,120 --> 00:27:28,630
braces u marki kwotazzjoni u semicolons.

608
00:27:28,630 --> 00:27:30,780
U ħafna ta 'dan
Jittieħed sintattika li mhix

609
00:27:30,780 --> 00:27:32,450
fil-livelli kollha intellettwalment interessanti.

610
00:27:32,450 --> 00:27:35,790
Tabilħaqq, huwa ta 'distrazzjoni utter
mill-ideat sempliċi ħafna

611
00:27:35,790 --> 00:27:37,370
li huma tluq magħna fil-wiċċ.

612
00:27:37,370 --> 00:27:41,760
Dan il-programm, kif inti tista 'biss raden,
prints għal iskrin tal-kompjuter ta 'xi ħadd

613
00:27:41,760 --> 00:27:44,070
il-kliem "virgola Hello dinja."

614
00:27:44,070 --> 00:27:44,860
Li dan.

615
00:27:44,860 --> 00:27:46,580
Allura ċar, hemm
lott ta 'għalf li l-

616
00:27:46,580 --> 00:27:48,970
jkollna fil-mod ta '
xi obviousness hemmhekk,

617
00:27:48,970 --> 00:27:52,490
iżda li għaddej biex malajr ħafna slip
bogħod u tkun kompletament intuwittivi.

618
00:27:52,490 --> 00:27:55,617
>> Tabilħaqq, dak li aħna qed tmur biex tagħmel
llum hija jiddistillaw dan pjuttost kumpless

619
00:27:55,617 --> 00:27:58,950
programm tfittex, li għal darb'oħra inti ser jiġu
biex jifhmu malajr, iżda għal xi ħaġa

620
00:27:58,950 --> 00:27:59,710
ferm aktar sempliċi.

621
00:27:59,710 --> 00:28:01,640
Ejja ngħidu biss dak li rridu nfissru.

622
00:28:01,640 --> 00:28:05,590
Ejja tfassal stampa ta 'dak li jfisser,
permezz ta 'dawn il-biċċiet puzzle hawn.

623
00:28:05,590 --> 00:28:09,110
>> Allura dan huwa l-ipprogrammar
lingwa magħrufa bħala Scratch.

624
00:28:09,110 --> 00:28:11,080
Hija ġiet żviluppata minn Media Lab MIT.

625
00:28:11,080 --> 00:28:14,830
U dak li inti ser tara fil-problema sett żero,
li se jiġu rilaxxati aktar tard tonight,

626
00:28:14,830 --> 00:28:18,980
aħna ser ikollhom inti tmur biex dan
URL hawn scratch.mit.edu.

627
00:28:18,980 --> 00:28:20,940
U dawn ikollhom web
interface bbażati via li

628
00:28:20,940 --> 00:28:22,540
inti se jikteb ewwel programm tiegħek.

629
00:28:22,540 --> 00:28:25,330
Jew dawk tal inti ma qabel
esperjenza, it-tieni programmi tiegħek,

630
00:28:25,330 --> 00:28:28,090
iżda f'ambjent li huwa
probabbilment ftit familjari u dik

631
00:28:28,090 --> 00:28:32,930
se push inti biex joħolqu xi ħaġa
jużaw dan l-ambjent ħafna viżwali.

632
00:28:32,930 --> 00:28:35,940
>> Issa, dak li jien ser tagħmel hawn
huwa tiftaħ il-programm innifsu.

633
00:28:35,940 --> 00:28:41,911
Hija teżisti mhux biss bħala web browser,
iżda wkoll bħala programm downloaded

634
00:28:41,911 --> 00:28:44,660
sabiex inti tista 'attwalment jużaw dan
jekk inti ma għandekx aċċess għall-internet.

635
00:28:44,660 --> 00:28:46,743
U jien ser tagħmel dan
fil hawn, fl Sanders, biss

636
00:28:46,743 --> 00:28:49,580
f'każ li l-Wi-Fi ma
jikkooperaw super tajjeb.

637
00:28:49,580 --> 00:28:52,640
U dak li jien ser tagħmel hu punt
out ftit karatteristiċi ta 'dan il-programm.

638
00:28:52,640 --> 00:28:55,720
Allura, biex tkun ċara, I jkollhom biss double
għafast l-ikona fuq id-desktop tiegħi,

639
00:28:55,720 --> 00:28:59,830
jew ekwivalenti marret għall scratch.mit.edu,
u huwa miġbud sa dan il-tieqa.

640
00:28:59,830 --> 00:29:01,650
Dan huwa ambjent programmazzjoni.

641
00:29:01,650 --> 00:29:04,110
Huwa biċċa ta 'softwer li
xi wħud mill-ħbieb tagħna fil MIT

642
00:29:04,110 --> 00:29:08,850
kiteb li ejja us u tikteb
programmi b'lingwa imsejħa scratch.

643
00:29:08,850 --> 00:29:12,010
>> Issa dan jiġri li jkun
qattus li wkoll jismu Scratch

644
00:29:12,010 --> 00:29:13,890
u dan huwa tiegħu dinja li jgħix fiha.

645
00:29:13,890 --> 00:29:17,175
Dan huwa l-istadju, biex ngħidu hekk, li
rettangolu fuq il-kantuniera ta 'fuq tax-xellug.

646
00:29:17,175 --> 00:29:18,800
U hu ma jkollhom dehra ta 'qattus.

647
00:29:18,800 --> 00:29:20,591
Inti tista 'tagħmel lilu ħarsa
bħal kull ħaġa u inti

648
00:29:20,591 --> 00:29:23,700
jista 'jkollhom ħafna sprites bħal dawn,
jew karattri, fi programm.

649
00:29:23,700 --> 00:29:27,450
Sadanittant, matul hawn fuq il-bogħod
dritt, huwa lavanja vojt big.

650
00:29:27,450 --> 00:29:30,260
U dan huwa fejn, fil-mument,
aħna ser tibda l-ipprogrammar

651
00:29:30,260 --> 00:29:32,750
billi jittrattienu u twaqqa
dawn puzzle grafika

652
00:29:32,750 --> 00:29:35,300
biċċiet li huma tajba
hawn fin-nofs.

653
00:29:35,300 --> 00:29:38,140
U hemm mod aktar minnhom minn
aħna ser jqattgħu ħin fuq hawn fil-klassi

654
00:29:38,140 --> 00:29:40,080
għaliex inti ser issib li
dawn qed kollha pjuttost intuwittivi.

655
00:29:40,080 --> 00:29:41,788
Għal darb'oħra, huwa ddisinjat
għat-tfal, iżda aħna

656
00:29:41,788 --> 00:29:45,759
jużawha biex tease apparti xi wħud minn dawk
ideat fundamentali ta 'varjabbli, loops,

657
00:29:45,759 --> 00:29:48,050
kondizzjonijiet, u, dalwaqt, l-affarijiet
bħall-funzjonijiet u avvenimenti

658
00:29:48,050 --> 00:29:51,810
u ħjut u affarijiet oħra fancy aħna ser
jiksbu biex qabel twil biex effettivament joħolqu

659
00:29:51,810 --> 00:29:53,840
xi ħaġa minn Scratch.

660
00:29:53,840 --> 00:29:54,810
Pun maħsuba.

661
00:29:54,810 --> 00:29:58,740
>> Issa, dak li jien ser tagħmel hawnhekk hija
ikklikkja fuq mhux mozzjoni, iżda l-kontroll.

662
00:29:58,740 --> 00:30:01,400
U dan huwa biss
kategorizzazzjoni tal here--

663
00:30:01,400 --> 00:30:03,150
u nara differenti
kulur sett ta 'blokki.

664
00:30:03,150 --> 00:30:05,030
Iżda avviż kliem familjari ftit.

665
00:30:05,030 --> 00:30:07,830
"Jekk" u "inkella jekk" u "ripetuti."

666
00:30:07,830 --> 00:30:10,440
U inti tista 'probabbilment raden
thats reminixxenti tal-fergħa,

667
00:30:10,440 --> 00:30:12,870
jew il-kondizzjonijiet rajna, u
anke-kostrutt looping.

668
00:30:12,870 --> 00:30:14,760
Allura aħna għandna blokki simili hawn.

669
00:30:14,760 --> 00:30:16,720
Iżda l-aktar interessanti
wieħed huwa dan wieħed hawn.

670
00:30:16,720 --> 00:30:20,690
Meta din il-bandiera aħdar huwa għafast,
dan, għal dawk programing minn qabel

671
00:30:20,690 --> 00:30:23,110
esperjenza, huwa ekwivalenti
għal funzjoni prinċipali.

672
00:30:23,110 --> 00:30:25,300
Iżda għal dawk familjari,
dan huwa l-biċċa puzzle

673
00:30:25,300 --> 00:30:27,320
li se tagħti bidu program kollu tagħna.

674
00:30:27,320 --> 00:30:31,350
Huwa letteralment ifisser meta mmur, f'dan
programm, u ikklikkja flag-- aħdar

675
00:30:31,350 --> 00:30:35,560
li tista 'tara up here fil-
rokna tax-xellug ta 'fuq tal-UI,

676
00:30:35,560 --> 00:30:38,570
hekk tara l-bandiera aħdar
li jmiss għall-sinjal waqfien aħmar?

677
00:30:38,570 --> 00:30:41,475
Meta I ikklikkja li, tiegħi
programm se run.

678
00:30:41,475 --> 00:30:43,850
Issa, jien ser tagħmel xi ħaġa
super sempliċi ma Scratch.

679
00:30:43,850 --> 00:30:46,640
Jien ser jimxi 'l quddiem
u jmorru l-panel jistenna

680
00:30:46,640 --> 00:30:50,010
hawn, fejn għandi mazz
ta 'biċċiet puzzle vjola,

681
00:30:50,010 --> 00:30:53,887
u jien ser jimxi 'l quddiem u jagħmlu
xi ħaġa super sempliċi bħal, ngħidu.

682
00:30:53,887 --> 00:30:55,720
U avviż then-- dan
test fil-kaxxa bajda

683
00:30:55,720 --> 00:30:59,290
huwa editable-- jien ser ngħid
"Hello dinja," bħad aħna

684
00:30:59,290 --> 00:31:01,470
għamlet f'dak testwali
Verżjoni mument ilu.

685
00:31:01,470 --> 00:31:05,920
U issa jekk immur u kklikkja dan
bandiera aħdar, I issa jkunu programmati.

686
00:31:05,920 --> 00:31:07,810
Mhuwiex partikolarment
programm interessanti,

687
00:31:07,810 --> 00:31:09,760
imma I magħmula l-kompjuter tagħmel xi ħaġa.

688
00:31:09,760 --> 00:31:13,120
I bdew programm u
ma dak I told li tagħmel.

689
00:31:13,120 --> 00:31:16,170
Issa, I jistgħu jkomplu drag u qatra
aktar u aktar ta 'dawn il-biċċiet puzzle

690
00:31:16,170 --> 00:31:19,220
u dawn qed tmur biex jorbtu ma 'xulxin, iżda
ejja SLAP xi terminoloġija hawn fuq

691
00:31:19,220 --> 00:31:21,680
li aħna ser tara rikorrenti
matul il-kors,

692
00:31:21,680 --> 00:31:24,610
u verament matul xjenza tal-kompjuter
u l-ipprogrammar aktar ġenerali.

693
00:31:24,610 --> 00:31:27,990
>> Dan "jgħidu" blokk, vjola, ejja
biss tibda ssejjaħ dikjarazzjoni.

694
00:31:27,990 --> 00:31:29,240
Huwa bħal dikjarazzjoni ta 'fatt.

695
00:31:29,240 --> 00:31:30,380
Agħmel dan.

696
00:31:30,380 --> 00:31:32,590
Għalhekk, huwa kategorija ta '
istruzzjonijiet li inti

697
00:31:32,590 --> 00:31:36,760
jista għalf kompjuter bħala parti
ta 'programm jew algoritmu.

698
00:31:36,760 --> 00:31:39,270
U biex tkun ċara, inti stajt
probabbilment meħuda għall mogħtija

699
00:31:39,270 --> 00:31:41,930
li inti għandek programmi fuq il-kompjuter tiegħek.

700
00:31:41,930 --> 00:31:45,850
U dawn qed tip ta 'algoritmi, iżda
programm huwa verament mazz ta 'algoritmi

701
00:31:45,850 --> 00:31:47,160
li xi bnedmin kiteb.

702
00:31:47,160 --> 00:31:49,040
Huma ppakkjati it up u
huma mibjugħa sabiex inti,

703
00:31:49,040 --> 00:31:51,330
jew huma stazzjonati fuq websajt
għalik biex tniżżel.

704
00:31:51,330 --> 00:31:54,930
Allura, a program huwa biss
mazz sħiħ ta 'żerijiet u dawk

705
00:31:54,930 --> 00:31:56,970
li, b'xi mod, il-bnedmin maħluqa.

706
00:31:56,970 --> 00:32:00,080
U dawk mudelli ta 'żerijiet u
dawk jirrappreżentaw affarijiet, finalment,

707
00:32:00,080 --> 00:32:04,030
bħal "jgħidu bonjour dinja" jew "play
din il-mużika "jew" play dan il-video "

708
00:32:04,030 --> 00:32:05,129
jew "ibgħat email."

709
00:32:05,129 --> 00:32:06,920
Iżda aħna ser terga 'lura fl
mod f'aktar dettall liema

710
00:32:06,920 --> 00:32:08,780
programm huwa meta inti,
yourself, jiktbu għalihom.

711
00:32:08,780 --> 00:32:11,320
>> Hawn statement-- ieħor
"Stenna għat-tieni wieħed."

712
00:32:11,320 --> 00:32:14,330
I ma jużaw dan s'issa, iżda jekk irrid
programm tiegħi biex nieqaf għal mument

713
00:32:14,330 --> 00:32:16,540
biex jagħmel xi ħaġa, I jista 'jgħidlek biex tagħmel dan.

714
00:32:16,540 --> 00:32:18,450
Stenna tieni waħda.

715
00:32:18,450 --> 00:32:20,150
Issa wieħed ieħor jista 'jkun "ħoss play."

716
00:32:20,150 --> 00:32:23,270
Allura, dan huwa uniku għall Scratch, dan
għandu l-abbiltà li jilagħbu ħsejjes.

717
00:32:23,270 --> 00:32:26,130
Allura, dikjarazzjoni I jista
użu, hawn, "ħoss play."

718
00:32:26,130 --> 00:32:29,530
Sadanittant, l-espressjoni Boolean,
għalhekk din hija kelma fancier

719
00:32:29,530 --> 00:32:34,490
imsemmija wara biss Guy jismu Mr bool,
u din hija kollha dwar kwistjoni.

720
00:32:34,490 --> 00:32:37,470
Veru jew false-- huwa l-maws 'l isfel?

721
00:32:37,470 --> 00:32:41,100
A espressjoni Boolean huwa biss
xi espressjoni bl-Ingliż

722
00:32:41,100 --> 00:32:42,860
li huwa jew vera jew falza.

723
00:32:42,860 --> 00:32:44,140
Jew fuq jew barra.

724
00:32:44,140 --> 00:32:45,130
Jew wieħed jew żero.

725
00:32:45,130 --> 00:32:46,960
Inti tista 'taħseb li
fi kwalunkwe numru ta 'modi,

726
00:32:46,960 --> 00:32:49,220
imma huwa la vera jew
dan falza, finalment.

727
00:32:49,220 --> 00:32:52,540
Allura "maws 'l isfel mark mistoqsija,"
li jkun espressjoni Boolean.

728
00:32:52,540 --> 00:32:54,300
U inti tista 'taħseb ta' oħrajn, forsi.

729
00:32:54,300 --> 00:32:57,510
Per eżempju, "huwa n-numru xellug
anqas min-numru dritt? "

730
00:32:57,510 --> 00:32:59,410
Li, wisq, ikun
espressjoni Boolean.

731
00:32:59,410 --> 00:33:01,540
"Inqas minn" hija espressjoni Boolean.

732
00:33:01,540 --> 00:33:03,280
>> Dan wieħed, wisq, "mouse pointer jmissux."

733
00:33:03,280 --> 00:33:05,196
M'inix ċert għaliex dawn
sejħitilha mouse pointer.

734
00:33:05,196 --> 00:33:08,430
Dan ifisser biss, hija l-cursor, huwa l-
vleġġa fuq l-iskrin, li jmissu l-qattus,

735
00:33:08,430 --> 00:33:09,022
per eżempju.

736
00:33:09,022 --> 00:33:10,480
Jew xi aspett ieħor ta 'l-iskrin.

737
00:33:10,480 --> 00:33:13,710
U huwa kwistjoni, għal darb'oħra, u
li jiddenota espressjoni Boolean.

738
00:33:13,710 --> 00:33:17,130
Xi ħaġa li inti tista '
tixtieq li tuża f'kundizzjoni.

739
00:33:17,130 --> 00:33:19,100
Allura aħna ser jaslu għal dan fi ftit mument.

740
00:33:19,100 --> 00:33:20,350
Tista "u" affarijiet flimkien.

741
00:33:20,350 --> 00:33:23,099
Għalhekk, jekk inti tixtieq li jiċċekkjaw jekk dan
huwa l-każ u li huwa l-każ,

742
00:33:23,099 --> 00:33:25,580
inti tista 'tuża "u" block bħal dan.

743
00:33:25,580 --> 00:33:26,850
U hawnhekk dik il-kundizzjoni.

744
00:33:26,850 --> 00:33:31,290
Avviż tal-forma tal-ftuħ ftit
fil-quċċata ta 'din il-biċċa puzzle isfar,

745
00:33:31,290 --> 00:33:34,480
huwa reminixxenti tal-forma
li aħna biss raw mument ilu.

746
00:33:34,480 --> 00:33:37,920
Kull wieħed minn dawn l-espressjonijiet Boolean
jkollhom dawn truf osservat

747
00:33:37,920 --> 00:33:39,030
fuq ix-xellug u lemin.

748
00:33:39,030 --> 00:33:43,140
U dan għaliex folks MIT iddeċieda
li permezz ta 'forom viżwalment ġarr,

749
00:33:43,140 --> 00:33:45,780
inti tista 'tip ta' tgħin lin-nies,
studenti u tfal ukoll,

750
00:33:45,780 --> 00:33:47,650
għall tip ta 'timla l-vojt litteralment.

751
00:33:47,650 --> 00:33:49,780
>> Issa li puzzle-- li
ftuħ huwa ftit żgħira,

752
00:33:49,780 --> 00:33:52,750
u kif aħna ser tara fil-programm,
fil Scratch, se jikber biex tajbin.

753
00:33:52,750 --> 00:33:54,830
Hija se żżomm il-forma tagħha, finalment.

754
00:33:54,830 --> 00:33:58,350
So kundizzjoni ejja inti tiddeċiedi
"Nagħmel xi ħaġa jew le?"

755
00:33:58,350 --> 00:34:00,470
A espressjoni Boolean
hija l-kwistjoni attwali

756
00:34:00,470 --> 00:34:04,100
inti qed tuża biex tiddeċiedi nista mur
l-OR xellug do mmur lejn il-lemin

757
00:34:04,100 --> 00:34:06,710
meta I jiltaqgħu dan
hekk imsejħa furketta fit-triq?

758
00:34:06,710 --> 00:34:07,980
Inti jista 'jkollhom żewġ fergħat.

759
00:34:07,980 --> 00:34:10,909
Jekk xi ħaġa huwa veru, do
dan, inkella mur il-mod,

760
00:34:10,909 --> 00:34:14,590
jew tista 'biss tagħmel xejn fuq
kollu, dan blokk implikat.

761
00:34:14,590 --> 00:34:16,360
Bl-istess mod, nistgħu bejta dawn l-affarijiet.

762
00:34:16,360 --> 00:34:20,204
Mela jekk inti tixtieq li jittripplika furketta fil-
triq, jew jagħmlu dan jew dan jew dak,

763
00:34:20,204 --> 00:34:21,870
Tista 'biss bejta dawn l-affarijiet flimkien.

764
00:34:21,870 --> 00:34:24,520
U tibda tikseb ftit
ikrah, eventwalment, għall-żgur,

765
00:34:24,520 --> 00:34:26,120
iżda l-loġika għadu l-istess.

766
00:34:26,120 --> 00:34:28,000
Tista 'litteralment taqra
dan fuq għal isfel

767
00:34:28,000 --> 00:34:33,290
u jgħid dak li means-- jekk dan
huwa veru, tagħmel dan, inkella jekk inkella.

768
00:34:33,290 --> 00:34:36,179
>> A loop ma jiksbu aktar sempliċi fil Scratch.

769
00:34:36,179 --> 00:34:37,422
Forever tagħmel dan li ġej.

770
00:34:37,422 --> 00:34:39,880
Issa inti tista 'ma taħseb
tista 'tagħmel ħafna għaliex hemm mhux

771
00:34:39,880 --> 00:34:42,839
ħafna spazju bejn il-quċċata u l-
qiegħ ta 'dan il-ftuħ biċċa puzzle.

772
00:34:42,839 --> 00:34:45,671
Imma inti taf tara Scratch se
jikbru li tajbin biċċiet puzzle ħafna

773
00:34:45,671 --> 00:34:47,060
kif inti tixtieq CRAM fil hemmhekk.

774
00:34:47,060 --> 00:34:48,960
Loop oħra tista 'tkun
espressa bil jirrepeti.

775
00:34:48,960 --> 00:34:51,590
Jekk inti taf minn qabel, "I
trid tagħmel xi ħaġa 10 darbiet, "

776
00:34:51,590 --> 00:34:54,010
inti tista 'biss tell Scratch
li tagħmel xi ħaġa 10 darbiet.

777
00:34:54,010 --> 00:34:57,260
U, sadanittant, nistgħu jkollhom varjabbli.

778
00:34:57,260 --> 00:34:59,572
Allura hawnhekk wieħed arbitrarja,
huwa oranġjo f'dan il-każ,

779
00:34:59,572 --> 00:35:00,780
u dan huwa tour whirlwind.

780
00:35:00,780 --> 00:35:04,540
Għal darb'oħra, inti ser issib dan ħafna aċċessibbli
ladarba tibda tipponta u tikklikkja.

781
00:35:04,540 --> 00:35:07,930
Stajt jismu n varjabbli tiegħi, imma I
setgħet imsemmija hija xejn nixtieq,

782
00:35:07,930 --> 00:35:11,280
u jien iffissar hawnhekk, fil-
dan l-eżempju arbitrarja, għal żero.

783
00:35:11,280 --> 00:35:14,250
>> Issa jaraw programm bħal bonjour
dinja mhux kollha li konvinċenti,

784
00:35:14,250 --> 00:35:17,900
Mela ejja attwalment jiftħu xi ħaġa
li student eks magħmula.

785
00:35:17,900 --> 00:35:23,100
Let me imorru quddiem u tiftaħ,
per eżempju, dan wieħed hawn,

786
00:35:23,100 --> 00:35:26,780
għal liema Nixtieq imħabba
li jkollhom voluntier.

787
00:35:26,780 --> 00:35:28,450
Kull dritt, kif about-- ejja go farther.

788
00:35:28,450 --> 00:35:29,240
Iva, come fuq up.

789
00:35:29,240 --> 00:35:30,056
X'hemm isem tiegħek?

790
00:35:30,056 --> 00:35:30,635
>> Abby: Abby.

791
00:35:30,635 --> 00:35:32,010
DAVID J. Malan: Abby, come fuq up.

792
00:35:32,010 --> 00:35:35,930
Allura qatt lagħbu
din il-logħba qabel?

793
00:35:35,930 --> 00:35:36,430
Abby: No

794
00:35:36,430 --> 00:35:37,370
DAVID J. Malan: Kull dritt.

795
00:35:37,370 --> 00:35:38,380
David, sbieħ li jissodisfaw inti.

796
00:35:38,380 --> 00:35:39,620
Come fuq matul.

797
00:35:39,620 --> 00:35:42,300
U dak huwa l-ipprogrammar tiegħek
isfond, jekk ikun hemm.

798
00:35:42,300 --> 00:35:43,914
>> Abby: Stajt tgħallmu xi C ++.

799
00:35:43,914 --> 00:35:45,580
DAVID J. Malan: You ħadthom tgħallmu xi C ++.

800
00:35:45,580 --> 00:35:48,382
U dak li huwa logħba tiegħek
playing isfond?

801
00:35:48,382 --> 00:35:49,505
>> Abby: Mhux ħafna.

802
00:35:49,505 --> 00:35:51,130
DAVID J. Malan: OK, hekk aħna ser jieħdu dik.

803
00:35:51,130 --> 00:35:52,700
Allura hawnhekk kif il-logħba ikun sejjer jaħdem.

804
00:35:52,700 --> 00:35:54,510
Jien ser jimxi 'l quddiem u
ikklikkja l-bandiera aħdar, li

805
00:35:54,510 --> 00:35:55,830
huwa up hawn fil-kantuniera.

806
00:35:55,830 --> 00:35:59,710
Issa predeċessur tiegħek fil-klassi
tak xi struzzjonijiet hawn.

807
00:35:59,710 --> 00:36:02,306
U fi ftit mument, huwa
jgħid "spazju biex tibda."

808
00:36:02,306 --> 00:36:03,680
Allura aqbad u laqat l-spacebar.

809
00:36:03,680 --> 00:36:05,507
>> GAME KOMPJUTER: Pikachu.

810
00:36:05,507 --> 00:36:08,340
DAVID J. Malan: U l-għan huwa li
jaqbdu l-ikel, kif muri hemm

811
00:36:08,340 --> 00:36:09,320
fuq ix-xellug.

812
00:36:09,320 --> 00:36:11,388
U biex [inaudible]

813
00:36:11,388 --> 00:36:15,356
>> [MUSIC jilagħbu logħba]

814
00:36:15,356 --> 00:36:27,280

815
00:36:27,280 --> 00:36:29,610
>> DAVID J. Malan: AWW, ukoll,
thank you for playing.

816
00:36:29,610 --> 00:36:32,800
Għandna hawn ftit
firda rigal għalik.

817
00:36:32,800 --> 00:36:35,574
Għandna CS50 stress ball,
jekk inti tixtieq li jagħżlu.

818
00:36:35,574 --> 00:36:36,820
Kull dritt, tajba biex jissodisfaw inti.

819
00:36:36,820 --> 00:36:39,680
Grazzi għall ġejjin u sfida.

820
00:36:39,680 --> 00:36:42,410

821
00:36:42,410 --> 00:36:46,910
Allura aħna għandna aktar blalen istress, hekk
ejja jagħmlu waħda aktar eżempju biex jimmotivaw.

822
00:36:46,910 --> 00:36:48,150
A voluntier?

823
00:36:48,150 --> 00:36:50,510
Kull dritt, kif madwar
dritt hawn quddiem.

824
00:36:50,510 --> 00:36:51,250
X'hemm isem tiegħek?

825
00:36:51,250 --> 00:36:51,660
>> PHILLIP: Phillip.

826
00:36:51,660 --> 00:36:52,660
>> DAVID J. Malan: Phillip.

827
00:36:52,660 --> 00:36:54,530
Come fuq up, Phillip.

828
00:36:54,530 --> 00:36:57,340
Allura, Phillip se tkun
kkontestat ma logħba oħra

829
00:36:57,340 --> 00:37:00,840
li wieħed mill-predeċessuri tiegħek
kiteb bħala parti mill-problema sett żero,

830
00:37:00,840 --> 00:37:03,510
imsejħa agħar Game Ivy tal.

831
00:37:03,510 --> 00:37:05,980
U aħna ser tara fi ftit
mument x'hemm mfisser b'dan.

832
00:37:05,980 --> 00:37:07,400
Phillip, sbieħ li jissodisfaw inti.

833
00:37:07,400 --> 00:37:09,060
X'inhu l-isfond tiegħek?

834
00:37:09,060 --> 00:37:10,310
PHILLIP: Magħmul lott ta 'kodifikazzjoni.

835
00:37:10,310 --> 00:37:11,110
Magħmul logħob ftit, wisq.

836
00:37:11,110 --> 00:37:11,570
>> DAVID J. Malan: OK.

837
00:37:11,570 --> 00:37:12,620
Qbilna ħafna ta 'logħob, wisq.

838
00:37:12,620 --> 00:37:14,230
U qatt lagħbu din il-logħba qabel?

839
00:37:14,230 --> 00:37:14,730
>> PHILLIP: Nru

840
00:37:14,730 --> 00:37:16,438
DAVID J. Malan: All
dritt, so here we go.

841
00:37:16,438 --> 00:37:18,434
Jien ser jimxi 'l quddiem
u kklikkja l-bandiera aħdar.

842
00:37:18,434 --> 00:37:24,160
>> [MUSIC GAME]

843
00:37:24,160 --> 00:37:27,770
>> [MUSIC MC Hammer, "U MA TISTAX touch dan"]

844
00:37:27,770 --> 00:38:39,790

845
00:38:39,790 --> 00:38:41,635
>> PHILLIP: [inaudible]

846
00:38:41,635 --> 00:38:42,760
DAVID J. Malan: [inaudible]

847
00:38:42,760 --> 00:38:44,740
PHILLIP: [inaudible]

848
00:38:44,740 --> 00:38:49,056
[Laughing]

849
00:38:49,056 --> 00:38:50,680
[MUSIC MC Hammer, "U MA TISTAX touch dan"]

850
00:38:50,680 --> 00:38:52,660
DAVID J. Malan: [inaudible]
Moħriet permezz tiegħu.

851
00:38:52,660 --> 00:38:54,094
PHILLIP: [inaudible]

852
00:38:54,094 --> 00:38:55,135
DAVID J. Malan: Mur quddiem.

853
00:38:55,135 --> 00:39:01,570
[MUSIC MC Hammer, "U MA TISTAX touch dan"]

854
00:39:01,570 --> 00:39:15,832

855
00:39:15,832 --> 00:39:16,915
DAVID J. Malan: Kull dritt.

856
00:39:16,915 --> 00:39:18,400
Prosit.

857
00:39:18,400 --> 00:39:25,150
>> [Applause]

858
00:39:25,150 --> 00:39:27,330
>> DAVID J. Malan: Aħna se
post li online aktar tard hekk

859
00:39:27,330 --> 00:39:29,820
li inti tista 'procrastinate
miegħu kif ukoll.

860
00:39:29,820 --> 00:39:32,550
Princeton taqa up li jmiss, wara dik.

861
00:39:32,550 --> 00:39:35,470
>> Allura issa ejja attwalment jipproċedi
li jibdew mill-bidunett,

862
00:39:35,470 --> 00:39:39,310
biex ngħidu hekk, u fil-fatt jibnu sa
nistgħu tease apparti xi wħud minn dawn l-ideat

863
00:39:39,310 --> 00:39:41,970
u biex tikseb xi ħaġa anke
aktar kumplessi mill-aħħar.

864
00:39:41,970 --> 00:39:45,240
Jien se jmorru fuq hawn u jien ser
jimxi 'l quddiem u toħloq fajl ġdid.

865
00:39:45,240 --> 00:39:47,460
Għalhekk għal darb'oħra, is-sett problema se jimxu
inti permezz xi wħud minn dawn il-passi.

866
00:39:47,460 --> 00:39:49,300
Imma, kollha I ma kien go
għall-menu File u I

867
00:39:49,300 --> 00:39:52,760
qal "ġodda," tant bħal Microsoft
Word, jew kwalunkwe programm bħal dik.

868
00:39:52,760 --> 00:39:56,630
>> U ejja imorru quddiem now-- u aħna
implimentata "Hello dinja" mument ilu,

869
00:39:56,630 --> 00:39:58,410
imma ejja do xi ħaġa cuter ftit.

870
00:39:58,410 --> 00:40:00,150
Jien ser jitla 'għal avvenimenti.

871
00:40:00,150 --> 00:40:02,350
U jien se tagħmel "meta
bandiera aħdar għafast. "

872
00:40:02,350 --> 00:40:05,830
U mbagħad jien ser tuża,
nistgħu ngħidu, fergħa.

873
00:40:05,830 --> 00:40:07,610
So jien ser tuża "jekk" kundizzjoni.

874
00:40:07,610 --> 00:40:10,940
U avviż kif malli I nikseb qrib
lilha, trid snap flimkien.

875
00:40:10,940 --> 00:40:13,020
So I let go u snaps flimkien.

876
00:40:13,020 --> 00:40:15,150
U issa I tista 'tagħmel xi ħaġa interessanti.

877
00:40:15,150 --> 00:40:19,150
Jekk I iscroll permezz hawn, jien ser
biex tara mazz sħiħ ta 'blokki.

878
00:40:19,150 --> 00:40:22,620
Jekk I mur "data" - let me zoom in--
hemm xi ħaġa dwar fatturi varjabbli.

879
00:40:22,620 --> 00:40:26,160
Jekk I mur "mozzjoni," inti tista '
apparentement jduru madwar l-affarijiet.

880
00:40:26,160 --> 00:40:28,760
Jekk I mur "operaturi" -
oh, dan huwa interessanti,

881
00:40:28,760 --> 00:40:31,000
I tista 'pick numru bl-addoċċ.

882
00:40:31,000 --> 00:40:34,119
So let me tagħmel xi ħaġa ma biss
b'xi probabbilità, biss għaliex.

883
00:40:34,119 --> 00:40:36,160
Jien ser jimxi 'l quddiem u
drag din il-biċċa puzzle,

884
00:40:36,160 --> 00:40:37,910
dan huwa li inqas minn
blokk, dan huwa biss

885
00:40:37,910 --> 00:40:39,480
"Huwa dan in-numru inqas minn dak waħda?"

886
00:40:39,480 --> 00:40:42,438
Imma ma rridx kodiċi hard numru
minħabba li jkun pretty inutli.

887
00:40:42,438 --> 00:40:46,270
So I m ser drag din il-biċċa
hawn, u avviż kif snaps fi,

888
00:40:46,270 --> 00:40:49,480
u issa let me imorru quddiem u jgħidu "jekk
in-numru li s qabad saltwarjament

889
00:40:49,480 --> 00:40:51,820
huwa inqas minn sitta, jagħmel dan li ġej. "

890
00:40:51,820 --> 00:40:52,790
Issa għaliex anqas minn sitta?

891
00:40:52,790 --> 00:40:56,400
X'inhu probabilità huwa dan effettivament
ser jagħti me, just intuwittivament?

892
00:40:56,400 --> 00:40:57,440
Madwar 50%, id-dritt?

893
00:40:57,440 --> 00:41:01,190
Jekk in-numru li l raden saltwarjament
bejn 1 u 10 huwa inqas minn sitta,

894
00:41:01,190 --> 00:41:03,480
b'mod ċar huwa wieħed, tnejn,
tlieta, erba ', jew ħames.

895
00:41:03,480 --> 00:41:06,740
U hekk li għaddej biex tagħti me a
50% probabbiltà ta 'dak li jiġri?

896
00:41:06,740 --> 00:41:09,890
>> Well ejja nagħmlu xi ħaġa bħal
dan, "play meow ħoss."

897
00:41:09,890 --> 00:41:11,750
U avviż, għal darb'oħra,
l-biċċa puzzle tikber

898
00:41:11,750 --> 00:41:13,700
li jitwaħħal, sakemm il-forom jaqblu.

899
00:41:13,700 --> 00:41:14,910
C'est x'hemm importanti.

900
00:41:14,910 --> 00:41:18,000
Let me go fuq biex Scratch
hawn u ikklikkja "play."

901
00:41:18,000 --> 00:41:19,300
Xejn jiġri.

902
00:41:19,300 --> 00:41:21,160
Huwa li bug?

903
00:41:21,160 --> 00:41:21,999
Le, mhux meħtieġ.

904
00:41:21,999 --> 00:41:24,040
Dan jista 'jkun biss li
numru akbar ġie magħżul.

905
00:41:24,040 --> 00:41:25,762
Mela ejja jagħmlu mill-ġdid.

906
00:41:25,762 --> 00:41:27,550
Xejn.

907
00:41:27,550 --> 00:41:28,344
>> [Meow]

908
00:41:28,344 --> 00:41:29,510
DAVID J. Malan: Hemm huwa.

909
00:41:29,510 --> 00:41:30,280
[Meow]

910
00:41:30,280 --> 00:41:31,690
DAVID J. Malan: Għal darb'oħra.

911
00:41:31,690 --> 00:41:32,300
No

912
00:41:32,300 --> 00:41:32,922
>> [Meowing]

913
00:41:32,922 --> 00:41:35,380
DAVID J. Malan: Mela jekk inti stajt
qatt lagħbu logħba, ta 'kors,

914
00:41:35,380 --> 00:41:38,500
fejn Jittieħed qed jiġri saltwarjament,
bħall-guys ħżiena huma ġejjin jew le

915
00:41:38,500 --> 00:41:41,350
ġejjin fuq l-iskrin, jew
affarijiet qed jaqgħu jew ma jaqgħux,

916
00:41:41,350 --> 00:41:43,610
li jinsab biss minħabba xi ħaġa super
sempliċi bħal dan qed jiġri.

917
00:41:43,610 --> 00:41:46,010
Pick numru bl-addoċċ, u jekk
huwa inqas minn xi valur,

918
00:41:46,010 --> 00:41:49,100
forsi jagħmlu dan jew forsi tagħmel dan.

919
00:41:49,100 --> 00:41:51,340
Nistgħu jinkorporaw
li fis-kundizzjoni.

920
00:41:51,340 --> 00:41:52,600
Ejja nagħmlu xi ħaġa differenti.

921
00:41:52,600 --> 00:41:53,559
>> Let me tarmi dik bogħod.

922
00:41:53,559 --> 00:41:56,058
Inti tista 'teħles ta' għalf minn
biss jittrattienu off lejn ix-xellug

923
00:41:56,058 --> 00:41:56,810
u kiri go.

924
00:41:56,810 --> 00:42:00,310
Let me imorru quddiem u jagħmlu dejjem blokk
u malajr ħafna tagħmel xi ħaġa annoying.

925
00:42:00,310 --> 00:42:03,010
Let me imorru quddiem u
jgħidu "play meow ħoss."

926
00:42:03,010 --> 00:42:06,620
Imma jien ma jridux li dan ikun wisq
annoying, so let me grab din il-blokka,

927
00:42:06,620 --> 00:42:09,090
"Stenna-tieni waħda," u avviż
hemm l-ebda aktar spazju għal dan.

928
00:42:09,090 --> 00:42:11,310
Imma jekk inti tmur qrib biżżejjed,
trid li jmorru hemm.

929
00:42:11,310 --> 00:42:14,100
So I let go u se
jikber biex timla l-blokk.

930
00:42:14,100 --> 00:42:15,932
Allura issa, dan huwa loop.

931
00:42:15,932 --> 00:42:16,432
[Meowing]

932
00:42:16,432 --> 00:42:18,473
DAVID J. Malan: Ninsab
litteralment tagħmel dan għal dejjem.

933
00:42:18,473 --> 00:42:19,360
Għal darb'oħra u għal darb'oħra.

934
00:42:19,360 --> 00:42:21,510
Dan huwa biss mhux sounding naturali.

935
00:42:21,510 --> 00:42:24,800
Let me imorru quddiem u jbiddlu dan
li mhux wieħed tieni, għal żewġ sekondi

936
00:42:24,800 --> 00:42:25,854
u hit Ikteb.

937
00:42:25,854 --> 00:42:28,770
U x'hemm sbieħ dwar Scratch huwa
li inti tista 'programm interattiv.

938
00:42:28,770 --> 00:42:32,450
Agħmel bidla, forsi hit Ikteb jew Play
darb'oħra, u se biss iżommu għaddejjin.

939
00:42:32,450 --> 00:42:34,962
Well, issa għaliex ma nagħmlu
xi ħaġa cuter ftit?

940
00:42:34,962 --> 00:42:39,680
Pjuttost milli tagħmel dak kollu mill-bidu nett,
let me imorru quddiem u tiftaħ avvanz

941
00:42:39,680 --> 00:42:43,180
magħmula wieħed, li jien minn qabel moħmija,
imsejjaħ "Pet l-Kat."

942
00:42:43,180 --> 00:42:44,920
U aħna ser post kollha ta '
dawn il-fajls fuq l-internet,

943
00:42:44,920 --> 00:42:48,464
u l-problema jistabbilixxu żero se jgħidlek
kif ikollhok aċċess għalihom u dawn jinfetħu.

944
00:42:48,464 --> 00:42:49,880
U avviż, dan huwa pjuttost sempliċi.

945
00:42:49,880 --> 00:42:53,860
Iżda bil-quddiem, I jidhru li grabbed
a "dejjem" blokk, hekk stajt ltqajna loop.

946
00:42:53,860 --> 00:42:55,500
U allura stajt ltqajna "jekk" kundizzjoni.

947
00:42:55,500 --> 00:42:57,410
Stajt ltqajna espressjoni Boolean.

948
00:42:57,410 --> 00:43:00,100
>> Allura bl-Ingliż, biss glancing fil
dan, speċjalment jekk inti stajt qatt

949
00:43:00,100 --> 00:43:04,278
programmati qabel, biss intuwittivament,
dak li huwa dan se tagħmel, dan il-programm?

950
00:43:04,278 --> 00:43:06,910
>> [Chatter UDJENZA]

951
00:43:06,910 --> 00:43:09,960
>> DAVID J. Malan: Jekk inti pet il-qattus,
il-qattus se meow, id-dritt?

952
00:43:09,960 --> 00:43:14,560
Għaliex "dejjem unchecking" huwa
l-mouse pointer li jmissu l-qattus.

953
00:43:14,560 --> 00:43:17,630
Allura biex tkun ċara, u I ma jgħidu
dan qabel, kollha ta 'dawn puzzle

954
00:43:17,630 --> 00:43:20,750
biċċiet u l-iskrittura li
għandna kkombinahom,

955
00:43:20,750 --> 00:43:25,510
biex ngħidu hekk, b'kitba huwa sinonimu ma
programm, verament, jappartjeni għal din il-qattus.

956
00:43:25,510 --> 00:43:30,110
U r-raġuni għaliex is-- avviż
kif dan l-istess qattus hawnhekk hija enfasizzata,

957
00:43:30,110 --> 00:43:32,710
stabbiliti hawn inti tista 'toħloq
tieni qattus jew kelb jew verament

958
00:43:32,710 --> 00:43:33,970
xi ħaġa li trid grafikament.

959
00:43:33,970 --> 00:43:35,900
Inti tista 'importazzjoni xi ħaġa
minn Photoshop, jew bħalhom,

960
00:43:35,900 --> 00:43:38,300
u jintegraw xi ħaġa jekk inti
tixtieq li tagħmel dan għal proġett.

961
00:43:38,300 --> 00:43:40,174
U dak li inti ser issib,
finalment, huwa li inti

962
00:43:40,174 --> 00:43:44,800
tista 'żżid skripts, żid puzzle
biċċiet, għal karattri individwali.

963
00:43:44,800 --> 00:43:47,210
Allura dawn kollha jappartjenu għall
dan qattus partikolari.

964
00:43:47,210 --> 00:43:51,770
Allura issa jekk I jimxi 'l quddiem u play
dan il-programm, xejn jiġri.

965
00:43:51,770 --> 00:43:52,970
Iżda tkun qed taħdem.

966
00:43:52,970 --> 00:43:56,364
Il-programm huwa f'dan dejjem loop,
tip ta 'stennija għal dak li jiġri?

967
00:43:56,364 --> 00:43:57,230
>> [Chatter UDJENZA]

968
00:43:57,230 --> 00:43:58,130
>> DAVID J. Malan: Biex domestiċi il-qattus.

969
00:43:58,130 --> 00:43:59,800
Mela jekk jien jimxu maws tiegħi lejn him--

970
00:43:59,800 --> 00:44:02,420
>> [Meowing]

971
00:44:02,420 --> 00:44:04,450
>> DAVID J. Malan: Allura issa
Jien petting-qattus.

972
00:44:04,450 --> 00:44:07,330
Sadanittant, jista 'jkollna fergħa doppja.

973
00:44:07,330 --> 00:44:10,370
Let me imorru quddiem u tiftaħ
up ma domestiċi-qattus.

974
00:44:10,370 --> 00:44:12,160
Aħna ser post dan online ukoll.

975
00:44:12,160 --> 00:44:16,760
Dan huwa xi ftit aktar
kumplessi, iżda mingħajr ma tgħid

976
00:44:16,760 --> 00:44:18,780
inti tista 'raden forsi
x'inhu jiġri.

977
00:44:18,780 --> 00:44:20,160
>> [Meowing]

978
00:44:20,160 --> 00:44:23,900
>> DAVID J. Malan: Cat huwa
meowing, ħin qodma grand.

979
00:44:23,900 --> 00:44:26,690
Iżda dan il-programm huwa ta 'kors
imsejħa "Ma Pet il Cat,"

980
00:44:26,690 --> 00:44:29,350
hekk b'mod ċar, nixtieq li pet-qattus.

981
00:44:29,350 --> 00:44:30,490
>> [ROARING]

982
00:44:30,490 --> 00:44:31,940
>> DAVID J. Malan: M'għandekx domestiċi il-qattus.

983
00:44:31,940 --> 00:44:34,230
Issa, ejja tagħti ħarsa
fi eżempju ieħor hawnhekk.

984
00:44:34,230 --> 00:44:38,035
Dan wieħed se jissejħu
"Hi, Hi, Hi," għal raġunijiet

985
00:44:38,035 --> 00:44:40,410
li se jkun ċar, għaliex
malli I run dan thing--

986
00:44:40,410 --> 00:44:41,401
>> [Barking SEAL]

987
00:44:41,401 --> 00:44:43,942
DAVID J. Malan: Faċli ħafna biex
jiktbu programmi Scratch annoying.

988
00:44:43,942 --> 00:44:45,300
[Barking SEAL]

989
00:44:45,300 --> 00:44:48,540
DAVID J. Malan: Issa aħna mhux se jmorru
fid-dettal ħafna ma 'dawn kollha,

990
00:44:48,540 --> 00:44:51,150
imma avviż hemm
koppja ta 'fatturi ġodda hawn.

991
00:44:51,150 --> 00:44:55,540
Hemm varjabbli, imsejħa "siekta,"
u allura hemm mazz ta 'kundizzjonijiet.

992
00:44:55,540 --> 00:44:57,900
U għal issa, let me
biss tease inti billi qal

993
00:44:57,900 --> 00:45:03,170
li jekk dan Guy gets wisq annoying,
I tista 'tolqot l-spacebar u hu waqfiet.

994
00:45:03,170 --> 00:45:05,880
Minħabba r-rwol li kellha mill
dawn iż-żewġ skripts hija kif ġej.

995
00:45:05,880 --> 00:45:08,510
Waħda minnhom hija tagħmel l-
Barking kull ftit sekondi.

996
00:45:08,510 --> 00:45:11,305
L-oħra hija ftit stennija
għalija li tolqot l-spacebar.

997
00:45:11,305 --> 00:45:14,780
U jekk I do hit l-spacebar,
li għaddej biex jibdlu

998
00:45:14,780 --> 00:45:18,096
l-istat ta 'dan il-varjabbli, il-valur
ta 'dan il-varjabbli, li apparentement

999
00:45:18,096 --> 00:45:20,470
imsejħa "siekta," I ma sejħa
xi ħaġa boring bħal n,

1000
00:45:20,470 --> 00:45:22,370
I sejħitilha kelma Ingliża, "siekta."

1001
00:45:22,370 --> 00:45:24,740
Minn 1 sa 0 jew 0-1.

1002
00:45:24,740 --> 00:45:26,830
Mill vera biex falza jew falza vera.

1003
00:45:26,830 --> 00:45:28,930
U għalhekk inti tista 'attwalment
tara issa, li inti

1004
00:45:28,930 --> 00:45:31,720
jista 'jkollhom żewġ skripts, tnejn
programmi running simultanjament,

1005
00:45:31,720 --> 00:45:34,360
u tnejn minnhom jistgħu jiġu seduta
fil-loop tagħmel xi ħaġa.

1006
00:45:34,360 --> 00:45:38,067
Stennija għall-bniedem biex jagħmlu
xi ħaġa bħal laqtu spacebar.

1007
00:45:38,067 --> 00:45:38,650
[Barking SEAL]

1008
00:45:38,650 --> 00:45:40,566
DAVID J. Malan: U issa
hu fit-triq tiegħu mill-ġdid.

1009
00:45:40,566 --> 00:45:41,640
[Barking SEAL]

1010
00:45:41,640 --> 00:45:45,220
DAVID J. Malan: Allura x'iktar
tista nagħmlu ma 'dawn l-eżempji?

1011
00:45:45,220 --> 00:45:50,920
Well, ejja imorru quddiem u tagħmel
pereżempju fir-għadd tan-nagħaġ.

1012
00:45:50,920 --> 00:45:59,210
Aħna ser tkompli din fuq il-linji hawn
of-- ejja jiftħu l-eżempju nagħaġ.

1013
00:45:59,210 --> 00:46:02,460
U avviż, ħafna bħal qabel, dan wieħed,
Thankfully, huwa ftit inqas annoying.

1014
00:46:02,460 --> 00:46:06,940
Ladarba I hit play here--
Oh no, dan huwa annoying.

1015
00:46:06,940 --> 00:46:10,130
Huwa se baa
b'xi probabbilità.

1016
00:46:10,130 --> 00:46:11,050
Ejja jilagħbu din darb'oħra.

1017
00:46:11,050 --> 00:46:15,221
>> [BLEETING NAGĦAĠ]

1018
00:46:15,221 --> 00:46:18,470
DAVID J. Malan: L-unika differenza hija
konna mibdula l kostum, biex ngħidu hekk,

1019
00:46:18,470 --> 00:46:21,710
u aħna qed tnaqqas bin-nofs u jgħidu
dak dak in-numru attwali huwa.

1020
00:46:21,710 --> 00:46:24,680
Well ejja imorru quddiem u
tieħu dan il-pass wieħed ulterjuri.

1021
00:46:24,680 --> 00:46:28,190
U let me tease inti ma
Karatteristika waħda oħra hawn.

1022
00:46:28,190 --> 00:46:31,800
Ejja imorru quddiem u tiftaħ
programm imsejjaħ Threads.

1023
00:46:31,800 --> 00:46:36,620
Tant simili inti tista 'jkollha waħda
Sprite, li skripts multipli,

1024
00:46:36,620 --> 00:46:41,250
inti jista 'jkollhom żewġ sprites, għasfur fl
qattus, li kull wieħed iskrittura tagħhom stess.

1025
00:46:41,250 --> 00:46:43,976
U kull wieħed minnhom jista '
joperaw simultanjament.

1026
00:46:43,976 --> 00:46:45,980
Jekk inti stajt qatt semgħu l-
kelma "multithreading"

1027
00:46:45,980 --> 00:46:49,240
kompjuter huwa "multithreaded" tfisser
hija tista 'tagħmel affarijiet multipli fuq darba,

1028
00:46:49,240 --> 00:46:50,880
u, tabilħaqq, sabiex tista 'Scratch.

1029
00:46:50,880 --> 00:46:52,690
>> U issa avviż-għasafar hija tip ta 'dumb.

1030
00:46:52,690 --> 00:46:55,100
Huwa biss tagħmel affarijiet bl-addoċċ,
bouncing off-iskrin.

1031
00:46:55,100 --> 00:46:59,460
Ovvjament il-qattus ġie pprogrammat
li tip ta 'jkollhom li jfittxu kapaċitajiet

1032
00:46:59,460 --> 00:47:02,680
dar fuq l-għasafar minħabba
hu dejjem tipponta lejn lilu.

1033
00:47:02,680 --> 00:47:06,176
Sakemm finalment, huwa
qabdiet l-għasafar attwali.

1034
00:47:06,176 --> 00:47:08,550
So I mhux se nitkellem dwar id-dettalji
hawn, imma int tista tip ta '

1035
00:47:08,550 --> 00:47:12,160
glimpse l-istess forom, xi
"Jekk" kundizzjonijiet, xi varjabbli,

1036
00:47:12,160 --> 00:47:15,740
forsi xi loops, huma
finalment tagħmel l-istess ħaġa.

1037
00:47:15,740 --> 00:47:18,400
>> Issa let me imorru quddiem u tiftaħ
up xi ħaġa oħra għal kollox,

1038
00:47:18,400 --> 00:47:20,920
tease xi wħud minnkom, partikolarment
dawk aktar komda,

1039
00:47:20,920 --> 00:47:22,760
dak li inti tista 'attwalment tagħmel ma' dan.

1040
00:47:22,760 --> 00:47:26,080
Jien ser jimxi 'l quddiem
u jiftħu Button here.

1041
00:47:26,080 --> 00:47:28,740
U dan huwa super
programm sempliċi seeming,

1042
00:47:28,740 --> 00:47:34,190
iżda jaraw dak li jiġri
meta I-- Watch dak

1043
00:47:34,190 --> 00:47:39,860
jiġri meta I tiftaħ din il-verżjoni ta 'dan,
hawn fil-browser, scratch.mit.edu.

1044
00:47:39,860 --> 00:47:43,460
U meta I ikklikkja dan aħmar big
buttuna, avviż x'jiġri.

1045
00:47:43,460 --> 00:47:46,110

1046
00:47:46,110 --> 00:47:47,647
Allura x'inhu għaddej hawn?

1047
00:47:47,647 --> 00:47:50,480
Hemm effettivament kumplessità ħafna aktar
tmur fuq taħt il-barnuża,

1048
00:47:50,480 --> 00:47:52,896
anki jekk stajt implimentati
dan, jew franchement, Dan Bradley

1049
00:47:52,896 --> 00:47:54,660
implimentat dan hekk sempliċiment.

1050
00:47:54,660 --> 00:47:59,540
Huwa fasslet puzzle Scratch custom
biċċa, magħrufa bħala estensjoni Scratch,

1051
00:47:59,540 --> 00:48:01,300
hu sejjaħ dan Toggle.

1052
00:48:01,300 --> 00:48:06,332
>> U dak Toggle ma huwa jibgħat
messaġġ fuq l-internet.

1053
00:48:06,332 --> 00:48:08,290
U li messaġġ innifsu
jistenna ftit cryptic.

1054
00:48:08,290 --> 00:48:10,248
Iżda dan, wisq, inti ser
jifhmu sa tmiem tul ta.

1055
00:48:10,248 --> 00:48:14,930
Il-messaġġ hu attwalment jibgħat
jistenna ftit xi ħaġa bħal din.

1056
00:48:14,930 --> 00:48:15,921
Huwa biss it-test.

1057
00:48:15,921 --> 00:48:16,420
Mistur.

1058
00:48:16,420 --> 00:48:19,130
Int ser tifhem lilu mill-ħin
irridu jiksbu l-problema sett sebgħa.

1059
00:48:19,130 --> 00:48:22,180
Huwa biss jibgħat messaġġ testwali
fuq l-internet għal server.

1060
00:48:22,180 --> 00:48:24,330
U li server huwa, finalment,
tkellem lil din bozza tad-dawl, li

1061
00:48:24,330 --> 00:48:27,240
għandha wieħed minn dawk bozoz tad-dawl fancy
fiha li, hija stess, qed jitkellem

1062
00:48:27,240 --> 00:48:30,760
għall-Wi-Fi fin-netwerk hawn,
fejn apparat lokali isfel here--

1063
00:48:30,760 --> 00:48:34,400
u, finalment, huwa attwalment
tidwir li d-dawl u jintfew.

1064
00:48:34,400 --> 00:48:36,240
Iżda nistgħu nagħmlu aktar
affarijiet interessanti għadhom.

1065
00:48:36,240 --> 00:48:38,270
Avviż dak Dan għamlet ukoll għalina.

1066
00:48:38,270 --> 00:48:42,210
Huwa għamel sprites multipli, kull wieħed
li għandha b'kitba stennija għal klikk.

1067
00:48:42,210 --> 00:48:44,030
U jekk I ikklikkja aħmar, din tmur aħmar.

1068
00:48:44,030 --> 00:48:46,780
Jekk niġi blu, din tmur blueish.

1069
00:48:46,780 --> 00:48:49,854
Aħdar, isfar, oranġjo.

1070
00:48:49,854 --> 00:48:52,520
U dan kollu qed jiġri permezz
jmorru mod fuq l-internet,

1071
00:48:52,520 --> 00:48:54,690
lura stabbiliti hawn għall-
bozza tad-dawl, u jintfew.

1072
00:48:54,690 --> 00:48:57,981
>> U jekk inti tista 'temmen it-- u dan huwa
forsi wieħed mill-Scratch aktar kumplessi

1073
00:48:57,981 --> 00:49:00,930
proġetti xi ħadd ikollu implemented--
huwa ma kien, fil-ġustizzja, fil-jum.

1074
00:49:00,930 --> 00:49:04,180
U li kien l-isfida aħna threw isfel
li daN meta rajna jkollhom basal binarja,

1075
00:49:04,180 --> 00:49:05,810
għandna Scratch, kif
nistgħu jgħaqqdu lilhom?

1076
00:49:05,810 --> 00:49:08,410
U, tabilħaqq, dan huwa assolutament
xi ħaġa li kulħadd f'din il-kamra

1077
00:49:08,410 --> 00:49:14,250
tista 'tagħmel billi end-- semestru huwa hu
basal binarja reimplemented jużaw

1078
00:49:14,250 --> 00:49:18,310
l-istess interface li kien
fuq iPad tagħna nhar l-Erbgħa.

1079
00:49:18,310 --> 00:49:22,000
Allura li issa, jekk I attwalment
ikklikkja l-plus hawn fuq,

1080
00:49:22,000 --> 00:49:25,250
aħna għandna waħda, tnejn, tlieta.

1081
00:49:25,250 --> 00:49:27,550
I tista 'tolqot l-16 u dawwar dak fuq.

1082
00:49:27,550 --> 00:49:29,440
128, u ibqa 'sejjer hekk.

1083
00:49:29,440 --> 00:49:31,250
>> Issa jekk dik waħedha għandha
u minfuħa moħħok,

1084
00:49:31,250 --> 00:49:35,680
inti tista 'tagħmel affarijiet ferm aktar aċċessibbli,
ma tinvolvix xi hardware ċertament.

1085
00:49:35,680 --> 00:49:38,320
Just affarijiet fuq l-iskrin innifsu.

1086
00:49:38,320 --> 00:49:41,110
U, tabilħaqq, dak li ħafna studenti
jispiċċaw jagħmlu xi tip ta 'logħba,

1087
00:49:41,110 --> 00:49:44,600
xi biċċa xogħol artistiku, jew
xi tip ta 'animazzjoni interattiva.

1088
00:49:44,600 --> 00:49:47,352
U jien se ngħid waħda ta 'tagħna
Favourites kien dan wieħed.

1089
00:49:47,352 --> 00:49:49,060
U ħsibt jekk aħna
jista dim-dwal,

1090
00:49:49,060 --> 00:49:52,960
aħna ser tagħti idea f'dan finali
Proġett Scratch fil-konklużjoni.

1091
00:49:52,960 --> 00:49:57,460
Imma dak li inti ser għandu jżomm f'moħħu, bħala
I tista 'tease inti ma wieħed dettall aħħar,

1092
00:49:57,460 --> 00:49:59,140
sezzjonali se tibda ġimgħa d-dieħla.

1093
00:49:59,140 --> 00:50:00,830
Uffiċċju siegħa se tibda ġimgħa d-dieħla.

1094
00:50:00,830 --> 00:50:04,410
Problema sett żero se jkunu stazzjonati
CS50.harvard.edu aktar tard illum.

1095
00:50:04,410 --> 00:50:06,430
U int se tkun milqugħa
fl problema sett żero

1096
00:50:06,430 --> 00:50:10,070
biex stess Zamyla Chan CS50, l li
gwidi aktar ta 'walkthroughs tagħna.

1097
00:50:10,070 --> 00:50:11,952
Dawn huma integrati videos
fis-settijiet problema

1098
00:50:11,952 --> 00:50:15,160
li se żżomm f'idejk permezz ta 'lott
tal-up sett inizjali u permezz ta 'ħafna

1099
00:50:15,160 --> 00:50:16,570
tad-deċiżjonijiet possibbli tad-disinn.

1100
00:50:16,570 --> 00:50:19,570
Mela jekk inti stajt qatt kellhom li l-emozzjoni
meta picking up a assenjazzjoni huiswerk

1101
00:50:19,570 --> 00:50:21,030
u mintix, fejn nista tibda?

1102
00:50:21,030 --> 00:50:23,510
Hi se jkollhom din ir-risposta għalik.

1103
00:50:23,510 --> 00:50:27,720
U issa, programm finali
minn wieħed mill-predeċessuri tiegħek

1104
00:50:27,720 --> 00:50:30,659
Bi tweġiba għall-mistoqsija
"X'tagħmel l-volpi jgħidu?"

1105
00:50:30,659 --> 00:50:32,242
[MUSIC YLVIS, "X'tagħmel l-FOX JGĦIDU?]

1106
00:50:32,242 --> 00:50:40,178

1107
00:50:40,178 --> 00:50:41,666
>> YLVIS: (KANT) Dog tmur woof.

1108
00:50:41,666 --> 00:50:43,650
Cat tmur meow.

1109
00:50:43,650 --> 00:50:47,520
Bird tmur tweet u maws tmur squeak.

1110
00:50:47,520 --> 00:50:49,240
Cow tmur moo.

1111
00:50:49,240 --> 00:50:51,690
Żrinġ tmur croak.

1112
00:50:51,690 --> 00:50:54,630
U l-iljunfant tmur toot.

1113
00:50:54,630 --> 00:50:59,040
Papri jgħidu quack u ħut jmorru blub.

1114
00:50:59,040 --> 00:51:07,370
U s-siġill tmur ow ow ow, iżda
hemm wieħed ħoss li ħadd ma jaf,

1115
00:51:07,370 --> 00:51:10,330
dak ma l-volpi jgħidu?

1116
00:51:10,330 --> 00:51:11,020
U

1117
00:51:11,020 --> 00:51:12,478
>> DAVID J. Malan: Li lilha għall CS50.

1118
00:51:12,478 --> 00:51:15,436
Aħna se tara inti fil
Puzzle Jum u nhar it-Tnejn.

1119
00:51:15,436 --> 00:51:16,424
>> [Applause]

1120
00:51:16,424 --> 00:51:19,882
>> [MUSIC YLVIS, "X'INHU does IL JGĦIDU FOX?"]

1121
00:51:19,882 --> 00:51:24,840

1122
00:51:24,840 --> 00:51:28,820
>> Narrator: U issa fil-fond
ħsibijiet, billi Daven Farnham.

1123
00:51:28,820 --> 00:51:31,770

1124
00:51:31,770 --> 00:51:34,570
Illum sibt hit fil-
imb'wiċċ ma 'ktieb tat-telefon.

1125
00:51:34,570 --> 00:51:38,160
Konfużjoni, kif jien fil
home jaraw online.

1126
00:51:38,160 --> 00:51:42,528