#include<stdio.h>
void main()
{
int grade,i;
printf("please input the grade of the student:\n");
scanf("%d",&grade);
i=grade/10;
if(grade>=0&&grade<=100)
{switch(i)//用switch一定要加上大括号
{case 0:printf("E");break;
case 1:printf("E");break;
case 2:printf("E");break;
case 3:printf("E");break;
case 4:printf("E");break;
case 5:printf("E");break;
case 6:printf("D");break;
case 7:printf("C");break;
case 8:printf("B");break;
case 9:printf("A");break;
case 10:printf("A");break;
default: printf("error");break;}}
else printf("error");
}
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