题解 | #简单计算器#

#include <stdio.h>

int main()
{
    char ch = 0;
    double a,b;
    scanf("%lf%c%lf",&a,&ch,&b);
    if(ch == '+'||ch == '-'||ch == '*'||ch == '/')
    {
        if(ch == '+')
        printf("%.4lf+%.4lf=%.4lf",a,b,a+b);
        else if(ch == '-')
        printf("%.4lf-%.4lf=%.4lf",a,b,a-b);
        else if(ch == '*')
        printf("%.4lf*%.4lf=%.4lf",a,b,a*b);
        else if(ch == '/')
        {
            if (b!=0)
            {
                printf("%.4lf/%.4lf=%.4lf",a,b,a/b);
            }
            else
            {
            printf("Wrong!Division by zero!");
            }
        }
    }
    else
    {
        printf("Invalid operation!");
    }
    return 0;
}