题解 | #简单计算器#

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