输入五级制成绩 输出对应百分制

#include <stdio.h>

int main()
{
    char ch; 
    printf("输入五级制成绩(A~E):");
    scanf("%c",&ch);

    switch(ch)
    {   
        case 'A':printf("90~100\n"); break;
        case 'B':printf("80~89\n"); break;
        case 'C':printf("70~79\n"); break;
        case 'D':printf("60~69\n"); break;
        case 'E':printf("0~59\n"); break;
        default:printf("error\n"); break;
    }   
    return 0;
}

#include <stdio.h>
int main()
{
    int score;
    scanf("%d",&score);
    switch(score/10)
    {
    case 10:
    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;
}