题解 | #简单计算器#

#include <stdio.h>

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