#include<iostream> 
using namespace std;

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

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

	while(x % result != 0 || y % result != 0)
	{
		result--;
	}

	return result;
}


int max(int x, int y)
{
	if(x > y)
	{
		return x;
	}
	return y;
}

void referenceExample(int& r)
{
	r = 9;
}

void Swap(int& y, int& x)
{
	int t = x;
	x = y;
	y = t;
}


void reduceFraction(int& n, int& d)
{
	int gcf = GCF(n,d);
	n = n/gcf;
	d = d/gcf;
}


void main()
{
	//by reference or by value
	int x = 4;
	int y = 8;

	//Swap(x,y);
	reduceFraction(x,y);

	cout << x << "/" << y << endl;

	int& k = x;
	k = y;
	k = 7;
//	referenceExample(y);


}