编辑代码

#include <stdio.h>
int main(){  
    int grade,a,b,c,d,e;//每个分数段计数器
    a=b=c=d=e=0;         //计数器 初始值 必须 从 0
    while (scanf("%d",&grade)!=0) { //输入非整数 结束循环
        switch(grade/10){
            case 10: printf("A\n");a=a+1;break;
            case  9: printf("A\n");a=a+1;break;
            case  8: printf("B\n");b=b+1;break;
            case  7: printf("C\n");c=c+1;break;
            case  6: printf("D\n");d=d+1;break;
            default: printf("E\n");e=e+1;break;   
        }

    }//循环结束
    printf("a=%d\n",a);
    printf("b=%d\n",b);
    printf("c=%d\n",c);
    printf("d=%d\n",d);
    printf("e=%d\n",e);
    return 0;
}