passing object in function

// sol-final-ex1.cpp : Defines the entry point for the console application.


#include "stdafx.h"
#include "iostream"
using namespace std;
class omar {
private:
    int area, population;
public:
    omar() {
    }
    omar(int a, int p) {
        area = a;
        population = p;
    }
    void display(){
        cout << "area : " << area << "\npopulation : " << population << endl;
    }
    int get_area() {
        return area;
    }
    int get_pop() {
        return population;
    }
};
omar addcity(omar city1, omar city2) {
    int area,population;
    area = city1.get_area();
    population = city2.get_pop();
    omar temp(area, population);
    return temp;
}
int main()
{
    omar city1(200, 1000), city2(400, 3000),city3;
    city1.display();
    cout << "\n=======\n";
    city2.display();
    // city3 = area from city1 and population from city2
    city3 = addcity(city1, city2);
    city3.display();
    return 0;
}