//Program to demonstrate call-by-reference parameters.
#include <iostream.h>

void get_numbers(int& input1, int& input2);
//Reads two integers from the keyboard.

void swap_values(int variable1, int variable2);
//Interchanges the values of variable1 and variable2.

void show_results(int output1, int output2);
//Shows the values of variable1 and variable2, in that order.

int main( )
{
    int first_num, second_num;

    get_numbers(first_num, second_num);
    swap_values(first_num, second_num);
    show_results(first_num, second_num);
    return 0;
}

void swap_values(int variable1, int variable2)
{
    int temp;

    temp = variable1;
    variable1 = variable2;
    variable2 = temp;
}

//Uses iostream.h:
void get_numbers(int& input1, int& input2)
{
    cout << "Enter two integers: ";
    cin >> input1
        >> input2;
}

//Uses iostream.h:
void show_results(int output1, int output2)
{
    cout << "In reverse order the numbers are: "
         << output1 << " " << output2 << endl;
}