#include <iostream>

using namespace std;

class Fraction
{ 
	int nume, deno;
public:
	Fraction() 	// 0/1
	{	nume = 0; 
		deno = 1;	}
	Fraction(int n, int d)
	{	nume = n;
		deno = d; 	}
	void Set(int n, int d)
	{	nume = n;
		deno = d;	}
	void Print() const
	{	cout << nume << '/' << deno;	}
	Fraction mult (fraction F)
	{	Fraction t;
		int n, d;
		n = nume*f.nume;
		d = deno*f.deno;
		t.Set(n, d);
		return t;
	}
	
};
	
int main ()
{ 
	int n, d;
	Fraction x;
	Fraction y;
	char dummy;	 

	cout << "Input x (n/d): ";
	cin >> n >> dummy >> d;
	while( n!=-1 && d!=1)
	{
		x.Set(n,d);
		cout << "Input y: ";
		cin >> n >> dummy >> d;
		y.Set (n, d);
		cout << "Operation? (+, -, *, /)";
		cin >> op;
		if( op == '*')
			z = x.Mult(y);
		else 	cout << "I am working on.\n\n";

		cout << "x: ";
		x.Print();
		cout << "\n";
		cout << "y: ";
		y.Print();
		cout << "\n";
		cout << "z: ";
		z.Print();
		cout << "\n";

		cout << "Input x (n/d, -1/1 to quit): ";
		cin >> n >> dummy >> d;
	}
	
	cout << "\nGoodbye.\n";
	return 0;
}