#include<iostream>
using namespace std;

void fun(int x)
{
	x = 99;
	cout << x << endl;
}

//x is, in this function, is a reference to an integer
//reference = nickname or psuedoname
void funRef(int& x)
{
	x = 77;
	cout << x << endl;
}

void trade(int& x, int& y)
{
	int z = x;
	x = y;
	y = z;
}

int Max(int x, int y)
{
	int result = x;
	if (y > x)
	{
		result = y;
	}
	return result;
}

void GetMax(int x, int y, int& result)
{
	result = x;
	if (y > x)
	{
		result = y;
	}
}

void Square(int& n)
{
	n = n * n;
}

//prototype
void Cube(int& n);

void main()
{
	int y = 88;
	//the variable y is passed to the function fun "by value" aka "by copy"
	fun(y);
	cout << y << endl;

	//the variable y is passed to the function fun "by reference" aka "by address"
	funRef(y);
	cout << y << endl;

	int i = 1;
	int j = 2;
	trade(i, j);
	cout << "i = " << i << endl;
	cout << "j = " << j << endl;

	int k;
	k = Max(i, j);
	cout << k << endl;
	GetMax(i, j, k);
	cout << k << endl;

	Square(k);
	cout << k << endl;


}

void Cube(int& n)
{
	n = n * n * n;
}