#include "stdafx.h"
#include<iostream>
using namespace std;

class complex {
public:
    complex() { real = 0, image = 0; }
    complex(double r, double i) { real = r; image = i; }
    friend complex add(complex &c1, complex  &c2);
    void display();
private:
    double real;
    double image;
};
complex add(complex &c1, complex  &c2) {
    complex c3;
    c3.real = c1.real + c2.real;
    c3.image = c1.image + c2.image;
    return c3;
}
void complex::display() {
    cout << real << "+" << image << "i" << endl;
}
int main() {
    complex c1(3, 4), c2(6, 8), c3;
    c3 = add(c1, c2);
    cout << "c1=", c1.display();
    cout << "c2=", c2.display();
    cout << "c3=", c3.display();
    return 0;
}