#include <stdio.h>
int main()

{
float score;
int a;
printf("请输入您的成绩：\n");
scanf("%f",&score);
a=score/10;
switch(a)
{

case 9: case 10:printf("您的成绩为：%0.2f,等级为A\n",score);break;
case 8:printf("您的成绩为：%0.2f,等级为B\n",score);break;
case 7:printf("您的成绩是：%0.2f,等级为C\n",score);break;
case 6:printf("您的成绩是：%0.2f,等级为D\n",score);break;
case 5:case 4:case 3:case 2:case 1:case 0:printf("您的成绩是：%0.2f,等级为E\n",score);break;
default:printf("输入有误，请重新输入\n");
}
return 0;

}