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#include <stdio.h>

int main()

{

? ? int i,sum=0;

? ? i=1;

? ? while( i<=100 ) ?//循環條件應該是什么呢？

? ? {

? ? ? ? sum=sum+i;

? ? ? ? i++; ? ? ? ? //這里是不是應該改變循環變量的值

? ? }

? ? printf("100以內所有數之和為：%d\n", sum);

? ? return 0;

}

循環條件約束語句的問題。while后面括號里的語句條件不匹配。

while中的i<=100

OK了，可以編寫了

等你好消息