// program to add one to function parameter
// illustrate pass by reference

#include <iostream>
using namespace std;

void add1(int &);               //function prototype

int main()
{
    int k = 5;

    cout << "in main - before call: "<< k << endl;
    add1(k);
    cout << "in main - after call: "<< k << endl;

//  system("pause");            //un-comment when using DevC++
    return 0;
}

/* function that adds one to its parameter */
void add1(int &x)               //x is receiving a reference to k
{
    cout << "in function - before adding: " << x << endl;
    x++;
    cout << "in function - after adding: " << x << endl;
    return;
}