c++之运算符重载

#include <iostream>
using namespace std;

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

Complex Complex::operator+(Complex & c2){
    Complex c;
    c.real = real+c2.real;
    c.imag = imag+c2.imag;
    return c;
};

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

int main(int argc, const char * argv[]) {
    Complex c1(3,4), c2(5,-10), c3;
    c3 = c1+c2;
    cout<<"c1=";c1.display();
    cout<<"c2=";c2.display();
    cout<<"c3=";c3.display();
    
    return 0;
}

//输出8，-6

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