C++运算符重载

#include<iostream>

using namespace std;

class complex{

    double real,imag;

    public:

    complex(double r=0,double i=0){

        real=r;

        imag=i;

    }

    complex operator+ (complex &c2);

    void display();

};

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<<"i"<<endl;

}

int main()

{

    complex a(1,2),b(2,3),c;

    c=a+b;

    c.display();

}

还有种更简单的方法，重载函数还可以这样写

complex complex::operator+(complex &c2)

{
    return complex(real+c2.real,imag+c2.imag);
}