#include<stdio.h>

int main()
{
    int counter=0;
    int grade;
    float sum=0;
    while(1)
    {
        printf("Input the grade:");
        scanf("%d",&grade);
        if(grade!=-1)
        {
            sum = sum + grade;
            counter++;
        }
        else
        {
            break;
        }
    }
    printf("The average is:%d\n",sum/counter);
    return 0;
}

为什么sum值一直是0...............我明明加了sum = sum + grade;  但是每次循环sum值一直是0000

#define _CRT_SECURE_NO_DEPRECATE
#include<stdio.h>
int main()
{
    int counter = 0;
    int grade;
    float sum = 0;
    while (1)
    {
        printf("Input the grade:");
        scanf("%d", &grade);
        if (grade != -1)
        {
            sum = sum + grade;
            counter++;
        }
        else
        {
            break;
        }
    }
    printf("The average is:%f\n", sum / counter);
    system("pause");
    return 0;
}
这是什么东西？？求平均成绩？

是平均成绩~但是求得结果不对。总是0

能帮我指出错误吗？ 我感觉并没有错！

3楼正解

sum 类型由 float 改成 int 就可以了