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解釋下++和=++

解釋下++和=++

qq_氐語_0 2017-03-01 14:04:02
score++;能寫成score=score++;嗎?為什么
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TA貢獻(xiàn)3條經(jīng)驗(yàn) 獲得超1個(gè)贊

++是有兩種情況的,如:

a++;

++a;

這兩個(gè)語句在不賦值時(shí),兩個(gè)語句執(zhí)行完后,都是自加? 1。

但是:

a = 1;

b=a++;

a = 1;

b=++a;

是不同的,前者b = 1,a = 2;

后者b = 2, a = 2;

兩者最大區(qū)別就是先運(yùn)算再賦值,還是先賦值再運(yùn)算!

所以:

score++;可以寫成score = ++score;

不能寫成score = score++;

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