#include <iostream>

using namespace std;

//function prototype - promise to write a function with this signature
int greater(int x, int y);
void fun();

int fibonacci(int n, int x, int y)
{
	if(n > 0)
	{
		int newFibonacci = x + y;
		//cout << newFibonacci << endl;
		x = y;
		y = newFibonacci;
		return fibonacci(n-1,x,y);
	}	
	return x + y;
}

//& makes x a reference variable
void changeStuff(int& y)
{
	y = 9;
}

void main()
{
	//fun();
	//int answer = fibonacci(4,0,1);
	//cout << answer << endl;
	int y = 0;
	changeStuff(y);
	cout << y << endl;
}

//int greater(int x, int y)
//{
//	if(y > x)
//	{
//		return y;
//	}
//	return x;
//}
void fun()
{
	cout << greater(99,56);
}

int greater(int x, int y)
{
	int result = x;

	if(y > x)
	{
		result = y;
	}

	return result;
}