如果使用-else程序，在输入字符值时会出现问题

Question

这是我的代码。问题是-编写代码以根据学生的出勤率检查学生有资格参加考试的天气。如果学生的出勤率超过75，则他有资格参加考试，否则，将询问他/她有健康状况。如果是，将被允许，否则将不被允许。请帮帮我。在if语句期间，我无法提供输入。

    int main()
    {
    char response;
    int clshld,per;
    int clsatnd;

    clshld = 330;   //total no of class held
    printf("no of class attended\n");
    scanf ("%d", &clsatnd);
    per=(clsatnd*100)/clshld;    //percentage formula
    printf ("\nattendence percentage is %d", per);

    if (per<75)
    {
        printf ("\ndo you have  a medical condition??");
        scanf ("%c", &response);
        if (response =='y')
        {
            printf ("\nyou can sit in the exam");
        }

        else 
        {
            printf ("\nattendence too low ! you can't sit in the exam.'");
        }
    }
    else
    {
        printf ("\nyou are eligible to sit in the exam.");
    }
    return 0;
    }

Answer 1

尝试一下：

#include<stdio.h>

int main()
{
    char response;
    int clshld,per;
    int clsatnd, trash;

    clshld = 330;   //total no of class held
    printf("no of class attended\n");
    scanf ("%d", &clsatnd);
    scanf("%c", &trash);
    per=(clsatnd*100)/clshld;    //percentage formula
    printf ("\nattendence percentage is %d", per);

    if (per<75)
    {
        printf ("\ndo you have  a medical condition?? ");
        scanf ("%c", &response);

        if (response =='y')
        {
            printf ("\nyou can sit in the exam");
        }

        else
        {
            printf ("\nattendence too low ! you can't sit in the exam.'");
        }
    }

    else
    {
        printf ("\nyou are eligible to sit in the exam.");
    }

    return 0;
}