我還是不明白flag=-flag如何算出1-2.。。的，我自己算出來只有正數(shù)，有沒有大佬能詳細(xì)解答下
? ? {
? ? ? ??
? ? ? ? flag=-flag;
? ? ? ??
? ? ? ? sum=sum-i*flag;
? ? }??
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? ? {
? ? ? ??
? ? ? ? flag=-flag;
? ? ? ??
? ? ? ? sum=sum-i*flag;
? ? }??
2022-03-18
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2022-04-01
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2022-03-21
flag=-flag的時(shí)候，也就是第一次循環(huán)sum那欄是sum+i，也就是1，第二次循環(huán)的時(shí)候用來循環(huán)的是第一次變化過的flag，也就是這時(shí)候用來循環(huán)的是-flag，而在第二次循環(huán)它又一次進(jìn)行了*-1的操作，變成了正的flag，這時(shí)候sun那欄就成了sum-i*flag，也就是成了-2。然后進(jìn)入第三次循環(huán)了。所以他完成了一負(fù)一正的運(yùn)行