Define the Complex class.

输入

8.1
6.2
2.7
5.9

输出

c1 + c2 = 10.8 + 12.1 i
c1 - c2 = 5.4 + 0.3 i
主程序 (不能修改)

#include <iostream>
using namespace std;

#include "source.cpp"

int main(){
    Complex c1, c2, c3;
    cin >> c1 >> c2;
    c3 = c1 + c2;
    cout << "c1 + c2 = " << c3 << endl;
    c3 = c1 - c2;
    cout << "c1 - c2 = " << c3 << endl;
}

我的答案

class Complex
{
    double real,imag;   
public:
    Complex(){
        real=0;
        imag=0;
    }
    
    Complex(double a,double b){
        this->real=a;
        this->imag=b;
    }
    
    friend ostream & operator<<( ostream & os,const Complex & c);
    friend istream & operator>>( istream & is,Complex & c);
    
    Complex operator + (const Complex& x){
        return Complex(this->real+x.real,this->imag+x.imag);
    }
    
    Complex operator - (const Complex& x){
        return Complex(this->real-x.real,this->imag-x.imag);
    }

};

ostream & operator<<( ostream & os,const Complex & c)
{
    os << c.real << " + " << c.imag << " i"; //输出复数
    return os;
}

istream & operator>>( istream & is,Complex & c)
{
    is>>c.real;
    is>>c.imag;
    return is;
}