编辑代码

#include <stdio.h>
#include<math.h>
int main ()
{
     float score;
     int c;
     scanf("%f",&score);
     c=(int)score/10;
     switch(c)
    {
    case 10:  printf("成绩等级为A\n");break;
    case 9:   printf("成绩等级为A\n");break;
    case 8:   printf("成绩等级为B\n");break;
    case 7:   printf("成绩等级为C\n");break;
    case 6:   printf("成绩等级为D\n");break;
    default:  printf("成绩等级为E\n");
    }
    return 0;
}