// Lab 6 swapNums.cpp -- Using Value and Reference Parameters
// This program uses a function to swap the values in two variables.
// Llewellym van der Merwe
#include <iostream>
using namespace std;

// Function prototype
void swapNums(int&, int&);

/*****     main     *****/
int main()
{
    int num1 = 5,
    num2 = 7;

    // Print the two variable values
    cout << "In main the two numbers are "
        << num1 << " and " << num2 << endl;

    // Call a function to swap the values stored
    // in the two variables
    swapNums(num1, num2);

    // Print the same two variable values again
    cout << "Back in main again the two numbers are "
        << num1 << " and " << num2 << endl;

    return 0;
}

/*****     swapNums     *****/
void swapNums(int& a, int& b)
{   // Parameter a receives num1 and parameter b receives num2
    // Swap the values that came into parameters a and b
    int temp = a;
        a = b;
        b = temp;

    // Print the swapped values
    cout << "In swapNums, after swapping, the two numbers are "
        << a << " and " << b << endl;
}