代码如下：
#include "stdio.h"
void main()
{
    int a,b;
    char f,m='y';
    do
    {
        printf("请输入两个数字和运算符号：\n");
        scanf("%d%c%d",&a,&f,&b);
        switch(f)
        {
        case '+':
            printf("%d+%d=%d\n",a,b,a+b);break;
        case '-':
            printf("%d-%d=%d\n",a,b,a-b);break;
        case '/':
            printf("%d/%d=%d\n",a,b,a/b);break;
        case '*':
            printf("%d*%d=%d\n",a,b,a*b);break;
        default:
            break;
        }
        printf("若要再次进行运算则请输入y:\n");
        scanf("%m",&m);
    }while(m=='y');   
}
会无限循环？没搞清楚诶。