给出一百分制成绩要求输出成绩等级’A’、’B’、’C’、’D’、’E’。90分以上为‘A’80~89为‘B’70~79为‘C’60~69为‘D’ 60分以下为‘E’。要求用switch语句实现的C语言程序

#include <stdio.h>

int main()
{
    int score;
    char grade;

    printf("请输入成绩：");
    scanf("%d", &score);

    switch(score / 10)
    {
        case 10:
        case 9:
            grade = 'A';
            break;
        case 8:
            grade = 'B';
            break;
        case 7:
            grade = 'C';
            break;
        case 6:
            grade = 'D';
            break;
        default:
            grade = 'E';
            break;
    }

    printf("成绩等级为：%c\n", grade);

    return 0;
}