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!='+'&&c!='-'&&c!='*'&&c!='/') printf("Invalid operation!\n");
    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=='*') printf("%.4lf*%.4lf=%.4lf",a,b,a*b);
    else if(c=='/') 
    {
        if(b==0.0) printf("Wrong!Division by zero!\n");
        else printf("%.4lf/%.4lf=%.4lf",a,b,a/b);
    }
    return 0;
}