C语言 100内整数相加结果出错，如何解决？

Question

100内整数相加结果出错

代码如下#include <stdio.h>

int main()
{
int i,sum;
for(i=1;i<=101;i++)
{
sum=sum+i;
}
printf("The sum of all integers between 1 and 100 is %d\n",sum);
}

显示结果为

The sum of all integers between 1 and 100 is 5152

我尝试改错

将 i<=101 改为 i<=100 但得出结果为5051

如何算出100内相加为5050

Answer 1

你题目的解答代码如下：

#include <stdio.h>
int main()
{
    int i, sum = 0; //sum 初始要设置为 0
    for (i = 1; i <= 100; i++) //循环到i <= 100  或者是 i < 101;
    {
        sum = sum + i;
    }
    printf("The sum of all integers between 1 and 100 is %d\n", sum);
}

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