PassByReferenceDEMO.cpp

//************************************************************************
// Author: Rolando Carreon
// Date: mar 6 2025
// Language: C++
// Assignment: PassByValueDEMO
// Description: swaps values using pass-by-value and pass-by-reference
// to show the way it affects varibales values
//************************************************************************

#include<iostream>
using namespace std;

// function protypes
void callByValue(int, int);
void callByReference(int&, int&);





int main()
{
    // declare local variables
    int firstNumber = 10;
    int secondNumber = 5;
    
    // display values before any function calls
    cout << "Before the callByValue.\n";
    cout << "\t First Number: " << firstNumber << endl;
    cout << "\t Second Number: " << secondNumber << endl;
    
    // call the callByValue functin
    callByValue(firstNumber, secondNumber);
    
    // display values after callByValue
    cout << "After the callByValue.\n";
    cout << "\t First Number: " << firstNumber << endl;
    cout << "\t Second Number: " << secondNumber << endl;
    
    // call the callByReference function
    callByReference(firstNumber, secondNumber);
    
    // display values after callByReference
    cout << "After the callByReference.\n";
    cout << "\t First Number: " << firstNumber << endl;
    cout << "\t Second Number: " << secondNumber << endl;
    
    
    return 0;
}

// function definitions

// function that accepts two integers passed by value,
// swaps the values and displays the values
void callByValue(int numOne, int numTwo)
{
    // declare variables
    int temp;
    
    // use temp to swap the value
    temp = numOne;
    numOne = numTwo;
    numTwo = temp;
    
    // display values inside callByValue function
    cout << "Inside the callByValue.\n";
    cout << "\t First Number: " << numOne << endl;
    cout << "\t Second Number: " << numTwo << endl;
}


// function that accepts two integers passed by two integers passed by refference,
// swaps the values and displays the values
void callByReference(int& numOne, int& numTwo)
{
    // declare variables
    int temp;
    
    // use temp to swap the value
    temp = numOne;
    numOne = numTwo;
    numTwo = temp;
    
    // display values inside callByReference function
    cout << "Inside the callByReference.\n";
    cout << "\t First Number: " << numOne << endl;
    cout << "\t Second Number: " << numTwo << endl;
}