//	p. 116 reducing fraction
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#include <iostream>

using namespace std;

class Fraction
{
	int nume, deno;	// type out full names
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, y, z;	// 0/1
	char dummy, op;
	
	cout << "Input x (n/d, -1/1 to quit): ";
	cin >> n >> dummy >> d;

	while ( n!=-1 && d!=1)
	{
		//Set x= n/d
		x.Set ( n, d );
		cout << "Input y (n/d): ";
		cin >> n >> dummy >> d; // 1/2
		// Set y = n/d?
		y.Set (n, d);
		cout << "Opersation? (+, -, *, /) ";
		cin >> op;
		if( op == '*')
			z = x.Mult(y);
		else	
			cout << " I am working on. \n\n";
		// Debug  - out ?
		x.Print();
		cout << " " << op << " ";
		y.Print();
		cout << " = ";
		z.Print();
		cout << "\n\nInput x (n/d, -1/1 to quit): ";
		cin >> n >> dummy >> d;
	}


	cout << "\n\nFin.\n\n";
	
	return 0;
}