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[Powered by Google Translate] Tommy MACWILLIAM: pale Ann sou pasan, youn nan komen nan

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pwogramasyon konstwi nou pral wè nan tout CS50.

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Nou pral sèvi ak pasan lè nou vle fè yon

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travay plis pase yon fwa.

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Pou egzanp, nou ta ka vle enprime "hi" 100 fwa oswa ekri ak lèt ​​detache

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soti tout lèt nan alfabè a.

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Nan tou de ka sa yo, nou gen yon sèl bagay nou vle fè

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plizyè fwa, enprime soti yon bagay.

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Sepandan, ki sa nou enprime soti chak fwa yo ka varye.

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Se konsa, nou ka fè yon bagay yon ti kras diferan sou chak

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iterasyon, oswa kouri nan, nan riban an.

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Nou pral wè twa diferan kalite pasan nan C, pandan y ap

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pasan, pou pasan, epi fè pandan y ap pasan.

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Menm si sa yo kalite twa nan pasan gen yon sentaks diferan,

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lide yo dèyè yo se menm bagay la.

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Nou pral defini kèk blòk nan kòd nan aparèy òtopedik Curly,

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rele kò a nan riban an, ke nou vle yo egzekite

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kèk kantite fwa.

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Pa chanje valè yo nan varyab yo itilize nan kò a, nou

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ka fè riban nou fè yon bagay diferan chak fwa li nan kouri.

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Ak nenpòt ki riban nou ekri, nou pral bezwen tou deside ki lè nan

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riban ap sispann kouri.

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Si nou pa fè sa, Lè sa a, òdinatè konfyans nou an pral kontinye

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nan kouri ke riban jiskaske nou touye pwogram lan.

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Nan grafouyen, nou te ka sèvi ak repete nan n fwa

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bloke yo kreye yon riban.

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Tout moun nan moso yo andedan yon blòk ki t'ap di: repete 10

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ta dwe kouri 10 fwa.

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Lè sa a,, nou ta deplase sou moso yo apre sa riban.

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Se konsa, kondisyon arè nou an te tou senpleman, sa a te blòk te

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kouri 10 fwa.

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Se konsa, kite a rkree sa a nan C. Nan lòd pou grate asire

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ki moso yo ki nan blòk la repete yo egzekite

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egzakteman 10 fwa, reyur bezwen nan kenbe tras nan chak

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ekzekisyon nan blòk la repete.

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Nan kenbe tras nan konbyen fwa li te kò riban nou te

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egzekite, kite la kreye yon varyab rele mwen.

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Nou pral kòmanse mwen desann nan zewo, depi riban nou

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pa te kouri ankò.

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OK

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Koulye a, nou pral sèvi ak mo kle a pandan y ap kòmanse koupe riban nou an.

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Koulye a, nou pral bezwen konnen ki lè riban nou yo ap sispann, men

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kite a kite sa-a pou kounye a epi Lè sa a, tounen vin jwenn li.

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Tout dwa.

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Anndan nan riban nou an, kite yo jis enprime yon mesaj soti, tankou

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"Hi." Nou ka sèvi avèk fonksyon an printf yo pou sa.

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Tout dwa.

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Se konsa, kounye a nou ap anrejistre ke yon iterasyon nan kò a riban gen

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te egzekite.

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Nou ka fè sa pa ajoute 1 sou, oswa incrementing, kontwa nou

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varyab, mwen.

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Pou fè sa, nou ka di mwen ki egal a mwen plis 1, oswa pi plis

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tou senpleman, mwen plis plis.

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Great.

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Se konsa, kounye a nou ka wè ke chak fwa se riban nou kouri, nou

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varyab kontwa ap moute pa youn.

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Se konsa, nou konnen egzakteman konbyen itérations nou te kouri byen lwen tèlman.

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Apre yon sèl iterasyon nan riban la, valè nou

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nan mwen yo pral 1.

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Apre de itérations, mwen pral 2.

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Apre yo te fin 10 itérations, mwen pral 10.

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Se konsa, si nou vle kouri sa a riban egzakteman 10 fwa, Lè sa a,

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sa a se lè nou vle sispann.

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Se konsa, nou vle kouri sa a pandan y ap riban mwen se mwens pase 10, ak

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sa a, se egzakteman sa nou pral ekri, pandan y ap mwen

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gen mwens pase 10.

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Kondisyon sa a sanble jis tankou kondisyon sa yo nou itilize nan si

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blòk lòt bagay.

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Apre yo fin bay kò a nan riban nou te egzekite, pwogram nou an

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pral sote tounen moute nan kondisyon an pasan.

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Si kondisyon an se vre, Lè sa a, kò a nan nan

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riban yo pral kouri ankò.

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Si kondisyon an se pa vre, Lè sa a, riban nou pa yo pral

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kouri ankò epi yo pral deplase sou liy lan pwochen nan kòd

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anba riban nou an.

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Tout dwa.

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Se konsa, kite a pran yon gade nan yon kalite dezyèm

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riban, pou la riban.

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Bòkote mo kle a pandan y ap, nan parantèz, nou te gen yon sèl bagay,

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kondisyon an ki te bezwen yo dwe vre pou la

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nan kò riban dwe kouri.

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Sa vle di nou te gen yo kreye varyab kontwa nou deyò

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nan riban an epi sonje kantite li nan kèk pwen

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andedan nan riban an.

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Header a pou nou pou nou ka riban, sou lòt men an, gen twa

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pati, chak nan yo ki pral separe ak yon virgules.

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Nan twazyèm premye nou yo, nou ka deklare nenpòt san preskripsyon oubyen lòt moun sanble

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varyab nou ta renmen yo itilize nan riban nou an.

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An pratik, sa a kapab reyèlman itil.

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Nou vrèman pa bezwen varyab sa a, mwen, apre yo fin pandan y ap nou

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riban te kouri, pou nou vrèman pa ta dwe gen deklare li

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deyò nan riban an.

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Twazyèm Dezyèm pral kondisyon an ki fèt pou laverite

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pou nan kò a ap egzekite ankò, jis tankou

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nan riban pandan y ap nou an.

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Nan twazyèm dènye nou an, nou ka kouri nan yon deklarasyon ki di ke yo pral

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egzekite apre chak iterasyon nan riban a, se konsa nou pa gen

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bati l 'nan kò a riban.

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Se konsa, kite a ekri yon pou riban ki konte desann soti nan 5 a 1.

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Nou pral kòmanse avèk mo kle a pou.

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Nou ka kreye yon varyab kontwa an premye, ki nou pral

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mete a 5 tan sa a depi nou ap konte desann,

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swiv pa yon virgules.

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Next se kondisyon nou an, ki nou pral tounen vin jwenn.

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Twazyèmman, nou ta renmen dekrwasans varyab kontwa nou apre

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chak iterasyon nan riban an.

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Se konsa, olye ke li di mwen plis plis, nou pral di mwen mwens mwens.

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Tout dwa.

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Se konsa, nou vle kò a riban a kouri pandan mwen se toujou

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pi gran pase 0.

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Nan kò a nan riban an, se pou yo enprime soti valè a nan mwen.

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Pou fè sa, nou pral sèvi avèk fonksyon an printf, lè l sèvi avèk la d%

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kontneur.

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Sonje byen, pral ke kontneur ka ranplase ak nan

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valè de mwen.

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Finalman, kite a ajoute yon deklarasyon apre nou an pou riban.

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Lè nou kouri sa a riban, mwen pral kòmanse an nan 5,

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Se konsa 5 ap enprime.

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Yon fwa mwen vin 0, kondisyon an kontinyasyon, mwen se

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pi gran pase 0, yo pral pa gen okenn pi long kenbe.

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Se konsa, riban nou ap sispann pwomenad, epi nou pral wè nan

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deklarasyon apre riban an.

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Se konsa, kite a kouri sa a kòd.

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Premyèman, nou pral konpile yon

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countdown.c ak fè dekont.

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Koulye a, nou ka kouri sa a kòd avèk yo. Dekont /.

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Nan tou de pasan pandan y ap, epi pou pasan, kontinyasyon nou

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kondisyon yo pral tcheke anvan kò a

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nan la riban an egzekite.

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Sa vle di ke, si kondisyon nou yo se pa okòmansman

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vre, Lè sa a, kò a nan riban nou pa janm yo pral kouri.

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Se konsa, li pafwa itil yo tcheke kondisyon an apre a

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kò a riban an olye ke anvan li.

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Se konsa, kite a ekri yon riban vit itilizatè a pou yon nimewo

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jiskaske yon chif pozitif bay.

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Si itilizatè a entrain yon chif negatif, nou pral vle mande yo

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pou yon lòt nimewo.

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Se konsa, nou pral vle sa a èd memwa yo dwe andedan kay la

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kò koupe riban an.

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Sepandan, lè se riban an kouri a pou premye fwa, itilizatè a

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pa te ban nou nimewo a ankò.

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Se konsa, li pa fè sans yo tcheke si li nan pozitif.

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Olye de sa, nou pral vle tcheke nimewo a apre kò a nan

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se riban an kouri.

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Nou ka fè sa a ak yon fè pandan riban.

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Premyèman, nou pral kreye yon varyab, n, ki pral kenbe

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D 'itilizatè a la.

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Koulye a, nou pral sèvi ak mo kle a fè sa, ki te swiv pa aparèy òtopedik Curly ki

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pral kòmanse an kò a nan riban nou an.

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Nan kò a, nou ka akselere itilizatè a pou yon nimewo ak nan

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GetInt fonksyon.

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Koulye a, nou pral vle kò a nan sa a riban al touye ankò si

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itilizatè a tape yon chif negatif, se konsa nou pral di pandan y ap n

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gen mwens pase 0.

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Avi virgules an isit la apre deklarasyon an pandan y ap.

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Se konsa, kite a kouri sa a kòd.

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Premyèman, nou pral konpile sa a ak fè ki pozitif.

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Koulye a, nou ka kouri pwogram nan avèk yo. / Pozitif.

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Si nou bay pwogram sa a yon chif negatif, tankou negatif

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4, Lè sa a, n ap pouse ankò pou yon nimewo depi nan

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kondisyon pou yo èske nou pandan n ap riban te vre.

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Yon fwa nou bay yon chif pozitif, tankou 8, Lè sa a, nan

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kondisyon pou yo èske nou pandan n ap riban va sispann fè vre.

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Se konsa, riban an pa pral egzekite ankò.

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Epi sa a, li pou twa tip pasan n ap itilize nan C.

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Non mwen se Tommy, e sa se CS50.