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SPIKA 1: Hebu kuandika mpango na
graphical user interface kwamba pia

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ni pamoja na studio.

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Na katika studio hii, sisi ni kwenda kuhifadhi
posta, angalau kama kamba.

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Na sisi ni kwenda update studio ya kwamba
tena na tena, na tena.

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Ili sisi hatimaye kuhesabu
chini kutoka 50 hadi sifuri.

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Glabel, na kuiita studio, anapata
kurudi thamani ya glabel mpya.

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Sasa, mimi nina si kwenda kutoa hii
thamani studio bado, hivyo mimi itabidi

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kuweka katika quote, unquote.

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>> Ijayo hebu simu setFont, kupita
katika studio, na hebu kupita katika

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hasa font aitwaye
SansSerif 36 uhakika.

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font kinachotokea kuwepo
ndani ya CS50 appliance.

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Kisha hatimaye, hebu kuongeza studio
kwa dirisha kama ifuatavyo.

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Sasa, hebu kuendelea na kutumika
kitanzi kwamba kwenda kuhesabu

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kutoka 50 chini ya sifuri.

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Na ndani ya kitanzi, hebu iteratively
update studio na

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kuonyesha ni juu ya screen, Kwa, int i
anapata 50, i ni mkubwa kuliko, au sawa

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sifuri, i minus, minus.

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>> Sasa maandiko, ni zamu nje,
kuwa masharti.

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Lakini mimi nina kweli kuhesabu,
kutumia integers.

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Hivyo kwa namna fulani mimi nina kwenda na kubadili
integer, i, kwa kamba

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uwakilishi mshale.

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Kwa kufanya hivyo hebu kutangaza
char s bracket tatu.

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Hivyo kwamba tuna nafasi ya kutosha kuhifadhi
kwa tarakimu mbili idadi, ikifuatiwa na

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null Terminator.

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Basi hebu wito s magazeti f kupita
katika s, kupita katika quote,

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asilimia unquote i.

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Kuonyesha kwamba sisi kweli wanataka
na muundo integer.

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Hatimaye kupita katika i yenyewe.

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Kwa maneno mengine, s magazeti f, au kamba
magazeti f, kama magazeti f, anatarajia

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kamba format na kufuatiwa na baadhi ya vigezo
mbadala ndani ya kwamba

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kamba format.

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Lakini pia anapokea ni yake ya kwanza
hoja, katika eneo ambalo unaweza

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ungependa kuhifadhi string
kwamba umefanya kuwakilishwa

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pamoja na kamba kwamba format.

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>> Hivyo ijayo, hebu kwenda mbele na kuwaita kuweka,
studio, kupita katika studio, kupita katika s.

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Sasa, hatimaye, kwa sababu tu maandiko hii
upana ni kwenda na mabadiliko ya muda kama

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sisi kuhesabu chini kutoka 50, hadi 49, kwa nukta,
dot, dot, kwa 9-8.

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Ambayo si kama pana kama
tarakimu mbili idadi ni.

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Hebu kuendelea kufikiri dynamically
nini upana wa hii

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studio lazima na kisha kuhakikisha kwamba
ni daima katikati ya screen.

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Mimi kwanza kwenda kutangaza mara mbili,
kuiita X, na mimi nina kisha kwenda

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kuhifadhi ndani ya x, matokeo ya kupata
upana, kupita katika upana wa

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dirisha nzima, minus kupata upana,
kupita katika studio.

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Kisha kugawa jambo zima na mbili.

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Vile vile mimi nina kwenda kutangaza y kuwa
sawa ya kupata urefu wa nzima

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dirisha, minus kupata urefu wa tu
studio, na kugawanya kwamba wawili pia.

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Hatimaye, mimi nina kwenda kuwaita setlocation,
kupita katika studio,

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kupita katika x, kupita katika y.

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Kuna na nafasi
studio katika x comma y.

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>> Hatimaye, ili Countdown hii haina
kutokea haraka sana hebu

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pause, kwa kusema, milliseconds 100 kati ya
kila update ya studio.

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Kwa kufanya hivyo, tunaweza kuwaita pause
kazi, hiyo ni ilivyoelezwa katika

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Stanford portable maktaba,
kabisa tu kama ifuatavyo.

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>> Sasa hebu kuokoa, kukusanya,
na kuendesha mpango huu.

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Kufanya studio, dot slash, studio.

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Kuna user interface yangu
kuhesabu chini kutoka 50.

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Kuhesabu chini, na chini,
na chini, na kufanyika.

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