課程
/后端開發
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/C語言入門
? ? {
? ? ? ??
? ? ? ? flag=-flag;
? ? ? ? sum=sum-i*flag;
? ? }??
2022-03-18
源自:C語言入門 4-10
正在回答
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flag=-flag的時候,也就是第一次循環sum那欄是sum+i,也就是1,第二次循環的時候用來循環的是第一次變化過的flag,也就是這時候用來循環的是-flag,而在第二次循環它又一次進行了*-1的操作,變成了正的flag,這時候sun那欄就成了sum-i*flag,也就是成了-2。然后進入第三次循環了。所以他完成了一負一正的運行
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1 回答flag*=-1不是一直是負的嗎為啥會算出來算出來
4 回答sum+=i*flag; flag*=-1; 這個代碼是怎么運算的,想不明白
2 回答求大佬解答,這樣算不出來是25。。
1 回答 i++; sum+=i*flag; flag*=-1;怎么算出來sum等于-50,實在想不出來這個式子
1 回答有沒有大佬解釋一下這個?我不太明白
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2022-03-21
flag=-flag的時候,也就是第一次循環sum那欄是sum+i,也就是1,第二次循環的時候用來循環的是第一次變化過的flag,也就是這時候用來循環的是-flag,而在第二次循環它又一次進行了*-1的操作,變成了正的flag,這時候sun那欄就成了sum-i*flag,也就是成了-2。然后進入第三次循環了。所以他完成了一負一正的運行