题解 | 简单计算器

#include <stdio.h>

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