//	File name:	assign4.cpp
//	Author:		Christie Abbott
//	Instructor:	Dr. Wang	
//	Due Date:	February 27, 2008
//	Compiling:	g++ assign4.cpp
//	Execution:	./a.out
//	Goal: The program will perform the following operations on two fractions,
//		(+, -, /, *).

#include <iostream>

using namespace std;

class Fraction
{
	int numerator, denominator;
public:
	Fraction()
	{	numerator = 0;
		denominator = 1;
	}
	Fraction(int n, int d)
	{	numerator = n;
		denominator = d;
	}
	void Set(int n, int d)
	{	numerator = n;
		denominator = d;
	}
	void Write() const
	{	cout << numerator << '/' << denominator;	}
	Fraction mult(Fraction f)
	{ 	Fraction t;
		int n, d;
		n = numerator * f.numerator;
		d = denominator * f.denominator;
		t.Set(n, d);
		return t;	
	}
	  Fraction add(Fraction g)
        {       Fraction t;
                int n, d;
                n = numerator + g.numerator;
                d = denominator + g.denominator;
                t.Set(n, d);
                return t;
        }
	  Fraction sub(Fraction s)
        {       Fraction t;
                int n, d;
                n = numerator - s.numerator;
                d = denominator - s.denominator;
                t.Set(n, d);
                return t;
        }
	  Fraction div(Fraction a)
        {       Fraction t;
                int n, d;
                n = numerator / a.numerator;
                d = denominator / a.denominator;
                t.Set(n, d);
                return t;
        }

};

int main()
{
	Fraction x;
	Fraction y;
	Fraction z;
	int n, d;
	char dummy;
	char op;
	
	cout << "Input x (n/d), -1/1 to quit): ";
	cin >> n >> dummy >> d;
	while (n != -1 &&  d != 1)
	{
		x.Set(n, d);
		cout << "Input y (n/d): ";
        	cin >> n >> dummy >> d;
        	y.Set(n, d);
		cout << "Operation? (+, -, *, /) ";
		cin >> op;
		if( op == '*')
			z = x.mult(y);
		else if( op == '+')
			z = x.add(y);
		else if( op == '-')
			z = x.sub(y);
		else if( op == '/')
			z = x.div(y); 
				
		cout << "\n";
		x.Write();
		cout << " " << op << " ";
		y. Write();
		cout << " = ";
		z.Write();
		cout << "\n";
	
		cout << "\n\nInput x (n/d), -1/1 to quit): ";
        	cin >> n >> dummy >> d;
	}
	
	cout << "\n\nBye.\n\n";
	return 0;
}