题解 | 简单计算器

#include <cstdio>
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double a,b,d;
    char c;
    cin>>a>>c>>b;
    if(c=='+')
   { 
    d=a+b;
    cout<<fixed<<setprecision(4)<<a<<"+"<<b<<"="<<d;
    }
    else if(c=='-')
    {
    d=a-b;
    cout<<fixed<<setprecision(4)<<a<<"-"<<b<<"="<<d;
    }
    else if(c=='*')
    {
        d=a*b;
    cout<<fixed<<setprecision(4)<<a<<"*"<<b<<"="<<d;
    }
    else if(c=='/'&&b!=0.0)
    {
        d=a/b;
    cout<<fixed<<setprecision(4)<<a<<"/"<<b<<"="<<d;
    }
    else if(c=='/'&&b==0)
    cout <<"Wrong!Division by zero!";
    else cout<<"Invalid operation!";
    return 0;

}