#include <stdio.h>
#include <stdlib.h>
char f(int n);
int main()
{
    char grade_level;
    int grade;
    printf("请输入学生的成绩:");
    scanf("%d",&grade);
    grade_level=f(grade);
    printf("该学生的成绩等级为：%c",grade_level);
    return 0;
}
char f(int n)
{
    char level;
    switch(n/10)
    {
        case 10:
        case 9:
              level='A';
              break;
        case 8:
             level='B';
             break;
        case 7:
             level='C';
             break;
        case 6:
             level='D';
             break;
        case 5:
        case 4:
        case 3:
        case 2:
        case 1:
        case 0:
             level='E';
             break;
    }
    return level;
}