编写程序实现从键盘输入若干学生某门课的成绩，计算平均成绩并统计90分及以上人数，直到输入负数结束

Question

如题所述

Answer 1

#include <stdio.h>
int main()
{
    float chengji;
    int count_90=0;
    int sum=0;
    int count_stu=0;
    while(true)
    {
        scanf("%g",&chengji);
        if(chengji>=0)
        {
            sum+=chengji;
            count_stu++;
            if(chengji>=90)
            {
                count_90++;
            }
        }
        if(chengji<0)
        {
            float pingjun=sum*1./count_stu;
            printf("平均分是：%g\n90分以上的人有%d人",pingjun,count_90);
            return 0;
        }
    }
    return 0;
}

本回答被网友采纳