Examples

//Program to demonstrate call-by-reference parameters.

#include <iostream>

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;

}

//Uses iostream:

void get_numbers(int& input1, int& input2)

{

using namespace std;

cout << "Enter two integers: ";

cin >> input1

>> input2;

}

void swap_values(int& variable1, int& variable2)

{

int temp;

temp = variable1;

variable1 = variable2;

variable2 = temp;

}

//Uses iostream:

void show_results(int output1, int output2)

{

using namespace std;

cout << "In reverse order the numbers are: "

<< output1 << " " << output2 << endl;

}