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#include <stdio.h>

int main()

{

    int i,sum=0;

    i=1;

    while( i<=100 )  //循环条件应该是什么呢？

    {

        sum=sum+i;

        i++;         //这里是不是应该改变循环变量的值

    }

    printf("100以内所有数之和为：%d\n", sum);

    return 0;

}

循环条件约束语句的问题。while后面括号里的语句条件不匹配。

while中的i<=100

OK了，可以编写了

等你好消息