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>> DAVID J. Malan: Ann pran bagay sa yo
yon sèl etap pi lwen, kounye a.

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Sipoze ke mwen pa jis vle
ekri ak lèt ​​detache tout la pwogram mwen an

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lòd liy agiman.

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Men, mwen menm, olye de sa, vle ekri an lèt detache tout la
karaktè moun nan chak nan

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agiman liy lòd mwen, youn pou chak
liy, se konsa ke sou kouri sa a

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pwogram nan, Mwen tou senpleman wè yon kouran nan
karaktè sou ekran an ki

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kolektivman yo soti nan sekans mwen
nan lòd liy agiman.

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>> Oke, kouman mwen ka fè sa?

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Mwen ka kenbe entak bouk mwen yo devan
kijan mwen repete soti nan mwen yo jiska

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Arg yo nan lòd yo entegre sou la
agiman liy lòd tèt yo.

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Men, koulye a, nan chak iterasyon nan ki
bouk, mwen bezwen kounye a repňte sou chak

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nan karaktè yo ki oswa charaktèr
nan yon fisèl espesifik.

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Se konsa, yo fè sa, mwen bezwen yon sèl plis bouk.

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>> Se pou nou ajoute ke.

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pou Int, se pou yo rele l 'j, egal 0.

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Koulye a, mwen pral bezwen entegre
jiska longè a nan la

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fisèl kounye a nan argv.

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Se konsa, kite m 'bay tèt mwen yon lòt lokal
varyab, nou pral rele li n, li mete

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ki egal a longè a afè de la
agiman kounye a, ki se pral fè

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yo te jwenn nan argv bracket mwen pwenvigil.

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>> Kite m 'repňte soti nan j moute
jouk n ki te swiv pa yon

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enkreman sou chak iterasyon.

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Se pou nou kounye a ekri an lèt detache moun nan
karaktè sou ekran an.

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Printf% c tan sa a ki te swiv pa yon nouvo
liy, fèmen quote, vigil, ak koulye a, mwen

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bezwen karaktè a j-th
nan agiman an m-th.

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>> Se konsa, yo ka resevwa nan sa a, mwen kapab tou senpleman
presize ARV bracket m '

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jwenn agiman an m-th.

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Lè sa a, mwen ka plonje nan yon nivo pi fon
epi fè yon endèks segondè nan

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bracket j, fèmen parantèz,
pwenvigil, sove.

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Li kite yo kounye a konpile ak
kouri pwogram sa a.

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>> Fè ARGV2 -

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pa byen sa m 'te tann.

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Se pou yo woulo liv jiska premye a
nan mesaj erè sa yo.

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Apre sa, an wouj isit la, nou wè erè,
chal deklare fonksyon bibliyotèk

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strlèn ak kalite -

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oh, rete tann yon minit.

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Sa a se premye fwa mwen te itilize
strlèn, epi mwen pa t 'antisipe

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vle li nan premye, se konsa mwen pa t 'gen ladan yo
dosye a header ki deklare

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yon longè fonksyon fisèl.

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>> Se konsa, nan tèt la nan dosye mwen,
sonje, mwen gen CS50.h.

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Mwen gen estanda io.h.

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Men, li vire soti, mwen konnen sa a soti nan
lekti lòt dokiman an, se sa mwen bezwen

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yon twazyèm dosye header si mwen, tout bon,
vle itilize fonksyon an strlèn.

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Eske se sa ke fonksyon te deklare nan string.h.

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>> Se pou yo resave dosye a,
konpile yo, kouri.

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Ak tan sa a, nou pa fè sa jis
wè chak nan agiman yo.

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Nou olye pou wè chak nan agiman yo
yon karaktè nan yon tan.

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