简小的C++基础--重载运算符1

#include <iostream>

using namespace std;

class Complex
{
public:
    Complex(){real = 0;imag = 0;}
    Complex(double r,double i){real = r;imag = i;}
    friend Complex operator+(Complex &c1,Complex &c2);
    void display();
private:
    double real;
    double imag;
};

Complex operator+(Complex &c1,Complex &c2)
{
    return Complex(c1.real + c2.real,c1.imag + c2.imag);
}

void Complex::display()
{
    cout << "(" << real <<"," << imag << "i)" <<endl;
}

int main(int argc, char *argv[])
{
    cout << "Hello World!" << endl;
    Complex c1(4,5),c2(1,-12),c3;
    c3 = c1 + c2;
    cout << "c1 = " ; c1.display();
    cout << "c2 = " ; c2.display();
    cout << "c3 = " ; c3.display();
    return 0;
}