c语言输入成绩怎么判断等级

#include <stdio.h>

int main()

{

    int i;

    scanf("%d",&i);

    i/=10;

    switch(i){

        case 9:

            printf("A");

            break;

        case 8:

            printf("B");

            break;

        case 7:

            printf("C");

            break;

        case 6:

            printf("D");

            break;

        default:

            printf("E");

            break;

    }

    return 0;

}