Shared memory by 2 variables instead of pointers, 2 variables in 1 memory

//Shared memory by 2 variables instead of pointers, 2 variables in 1 memory
//współdzielenie pamięci przez 2 zmienne zamiast wskaźników, 2 zmienne w 1 pamięci
 //source:
//http://stackoverflow.com/questions/4629317/what-does-int-mean
// http://www.cplusplus.com/forum/windows/17153/

//author marcin matysek (r)ewertyn.PL
#include <iostream>
#include <conio.h>
#include <stdlib.h>

using namespace std;
void funkcja(int & nb3);

int main()
{
    int nb1=0;
    int &nb2=nb1;

    cout<<"Variable1 value= "<<nb1<<" Its address is: "<<&nb1<<endl;
    cout<<"Variable2 value= "<<nb2<<" Its address is: "<<&nb2<<endl;
    nb2=10;
    cout<<endl;
    cout<<"After modifying the 2 variables have value:"<<endl;
    cout<<"Variable1 value= "<<nb1<<" Its address is: "<<&nb1<<endl;
    cout<<"Variable2 value= "<<nb2<<" Its address is: "<<&nb2<<endl;

    funkcja(nb1);
    cout<<endl;
    cout<<"After leaving the function:"<<endl;
    cout<<"Variable1 value= "<<nb1<<" Its address is: "<<&nb1<<endl;
    cout<<"Variable2 value= "<<nb2<<" Its address is: "<<&nb2<<endl;

    system("pause");
    return 0;
}

void funkcja(int & nb3)
{
    cout<<endl;
    cout<<"in function Variable 3 have value and address of Variable1:"<<endl;
    cout<<"Variable3 value= "<<nb3<<" Its address is: "<<&nb3<<endl;
    cout<<"after modification Variable 3 ,Variable 3 In function has value:"<<endl;
    nb3=20;
    cout<<endl;
    cout<<"Variable3 value= "<<nb3<<" Its address is: "<<&nb3<<endl;
}