Example

//Program demonstrates a fct calling another fct

#include <iostream>

void get_input(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 order(int& n1, int& n2);

//Orders the numbers in the variables n1 and n2

//so that after the function call n1 <= n2.

void give_results(int output1, int output2);

//Outputs the values in output1 and output2.

//Assumes that output1 <= output2

int main( )

{

int first_num, second_num;

get_input(first_num, second_num);

order(first_num, second_num);

give_results(first_num, second_num);

return 0;

}

void get_input(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;

}

void order(int& n1, int& n2)

{

if (n1 > n2)

swap_values(n1, n2);

}

void give_results(int output1, int output2)

{

using namespace std;

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

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

}

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