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>> DAVID J. Malan: Ejja jikteb programm
li nippruvaw li tpartit l-valuri ta '

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żewġ varjabbli, x u y.

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Bil-quddiem, stajt bil-miktub ħafna
ta 'dan il-programm diġà.

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L-ewwel, I tiddikjara varjabbli, x,
u jaħżnu fiha l-valur, 1.

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Imbagħad Niddikjara y varjabbli u
taħżen fiha l-valur, 2.

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>> Imbagħad I tipproċedi printf li juri
il-valuri ta 'dawn iż-żewġ varjabbli.

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Imbagħad I pretensjoni ma printf ieħor
li għandha iskambji dawk il-varjabbli.

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Imbagħad I sejħa funzjoni msejħa swap.

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U mbagħad I jsostnu li l-varjabbli
ġew skambjati.

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U mbagħad I jistampa li dak I pretensjoni
huma l-valuri ġodda tal xuy.

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>> Issa dak li huwa dan swap funzjoni?

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Mhuwiex xi ħaġa li jiġi ma 'C.
Tabilħaqq, jekk inħarsu lejn il-quċċata ta 'tiegħi

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file, inti ser ikollok avviż li stajt iddikjarat
prototip għal dan swap funzjoni

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tispeċifika li dan jieħu żewġ ints,
arbitrarju imsejjaħ aub, u dan

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funzjoni ma ritorn xejn.

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Allura preżumibbilment, huwa ma dak li jgħid
fi bdil ta 'u l-valuri B.

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Ejja issa jimplimentaw swap.

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>> L-ewwel, jien ser tiddikjara temporanju
varjabbli u tassenja lilha

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il-valur ta ', għalkemm I jistgħu biss
faċilment maħżuna fiha b.

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Jien imbagħad se jibdlu l-valur
ta 'li jkun ugwali għal dak fil b.

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U mbagħad fl-aħħar, jien ser jibdlu l-
valur ta 'b li tkun liema kien, iżda huwa

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issa fl temperatura.

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>> Issa I titlob dak li stajt biss isir
huwa loġikament korretta.

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Stajt maħżuna a fil-varjabbli temporanju,
mibdula valur ta 'li jkun ta b, u mbagħad

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mibdula valur b li tkun dak kien.

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Imma meta I jikkompilaw u run dan
programm, I inkwetati li mhux

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tmur dak li nara.

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>> Jagħmlu, ebda swap.

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dot mmejla, ebda swap.

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U sfortunatament, skond printf,
il-valur ta 'xuy, anke

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wara we jippretendu li jiġu iskambji
minnhom, għadu 1 u 2.

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>> Issa għaliex huwa li?

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Ukoll, jirriżulta li fil-prinċipali, meta aħna
sejħa dan swap funzjoni, li jgħaddi fil-

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X u Y kif argumenti, huwa attwalment
kopji ta 'xuy li

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huma mgħoddija fis swap.

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Jiġifieri, il-valuri tagħhom 1 u 2 huma
mgħoddija fi swap bħala au b.

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U huwa u b li aħna qed finalment
iskambji fl prinċipali.

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>> Dan huwa, 1 isir 2, 2 isir 1.

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Iżda minħabba swap m'għandha l-ebda valur tar-ritorn
u minħabba li rċeviet kopji ta 'x

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u y, huwa imġieba tkun
ebda effett fuq xu y.

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Tabilħaqq, u b huma scoped, biex ngħidu hekk,
tpartit, filwaqt xuy jibqgħu

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scoped għal main.

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>> Allura għandna problema.

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Imma kif jiffissaw dan?

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