//      Miles Long
//      Instructor: Dr. Wang
//      Due date: 02/20/08
//      File name: Homework3.cpp
//
//	Fraction Calc. That allows the user to input 2 fractions
//	and a form of operation which will result in the program
//	solving the equation.

#include <iostream>

using namespace std;

class Fraction
{
	int nume, deno;
public:
	void Reduce()
	{
		int n = nume;
		int d = deno;
		while ( d != 0 )
		{
			int r = n % d;
			n = d;
			d = r;
		}
		
		if ( n != 0 )
		{
			nume /= n;
			deno /= n;
		}
	
		if (deno < 0)
		{
			nume *= (-1);
			deno *= (-1);
		}
		return;
	}

	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);
		t.Reduce();
		return t;
	}	
	Fraction Sub(Fraction f)
	{
		Fraction t;
		int n, d;
		n = (nume, deno) * f.deno;
		d = (f.nume, f.deno) * deno;
		n = (nume*f.deno) - (f.nume*deno);
		t.Set(n, d);
		t.Reduce();
		return t;
	}
	Fraction Divi(Fraction f)
	{
		Fraction t;
		int n, d;
		int i=2;
		n = nume*f.deno;
		d = deno*f.nume;
		t.Set(n, d);
		t.Reduce();
		return t;
	}
	Fraction Add(Fraction f)	
	{
		Fraction t;
		int n, d;
		n = (nume, deno) * f.deno;
                d = (f.nume, f.deno) * deno;
                n = (nume*f.deno) + (f.nume*deno);
		t.Set(n, d);
		t.Reduce();
		return t;
	}

};

int main()
{	int n, d;
	Fraction x, y, z, test;
	char dummy, op;
	
	cout << "Input x (n/d, -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;
        	
		// Set y = n/d
        	y.Set(n, d);

		cout << "Operation? (+, -, *, /) ";
		cin >> op;
		cout << "\n\n";

		if( op == '*')
			z = x.Mult(y);
		else if ( op == '-')
			z = x.Sub(y);
		else if ( op == '/')
			z = x.Divi(y);
		else if ( op=='+')
			z = x.Add(y);
		
		else  	cout << "I am woking on it.\n\n";
			
	
		// Output
		x.Print();	
		cout << " " << op << " ";	
        	y.Print();
        	cout << " = ";
                z.Print();
                cout << "\n";

		clrscreen();
		cout << "\n\n*******************\nInput x (n/d, -1/1 to quit): ";
	        cin >> n >> dummy >> d; 
	}

	cout << "\n\n^Fin.\n\n";
	return 0;
}