pass by reference x pass by address

#include <iostream>

using namespace std;

void AddOne(int &input) //passed by reference
{
    input++;
}

int main3()
{
    int x = 5;
    cout << "x = " << x << endl;
    AddOne(x);
    cout << "x = " << x << endl; //value of x is incremented to 6
    return 0;
}

//void chg(int *pValue)
//{
//  *pValue = 6; //dereferenced pointer
//}
//int main()
//{
//  int nValue = 5;
//  cout << "nValue = " << nValue << endl;
//  chg(&nValue); //pointer takes in address of nValue
//  cout << "nValue = " << nValue << endl; //nValue is changed to 6
//  return 0;
//}