题解 | 简单计算器

#include <stdio.h>

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