// Author: Jason Sanchez
// Instructor: Dr. Wang
// Due Date: April 21, 2008
// Goal: redo assign 4 with operator

#include <iostream>
        
using namespace std;
        
class Fraction
{
        int num;
	int deno;
public:

        Fraction()     
        {       num = 0; deno = 1;   }
        Fraction(int n, int d)  
        {       num = n; deno = d;   }
        void Set(int n, int d)
        {       num = n; deno = d;   }
        void Print() const
        {       cout << num << '/' << deno;   }
	 Fraction operator+ (Fraction f)
        {       Fraction t;
                int n;
		int d;
                n = num*f.deno + deno*f.num;
                d = deno*f.deno;
                t.Set(n, d);
		return t;
        }
	 Fraction operator- (Fraction f)
        {       Fraction t;
                int n, d;
                n = (num*f.deno) - (deno*f.num);
                d = deno*f.deno;
                t.Set(n, d);
                return t;
        }
	Fraction operator* (Fraction f)
        {       Fraction t;
                int n, d;
                n = num*f.num;
                d = deno*f.deno;
                t.Set(n, d);
                return t;
        }
	Fraction operator/ (Fraction f)
        {       Fraction t;
                int n, d;
                n = num*f.deno;
                d = deno*f.deno;
                t.Set(n, d);
                return t;
        }
	
};
                
int main()
{      
	int n;
	int d;
        Fraction x;
	Fraction y;
	Fraction z;
        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 << "Which operation: (+, -, *, /): ";
                cin >> op;
                if (op == '+')
			z = x+y;
		else if (op == '-') 
                        z=x-y;
		else if( op == '*')
                        z = x*y;
		else if (op =='/')
			z=x/y; 
                else    cout << "Invalid, Please try again.\n\n";
  
   		cout <<"\n";
                x.Print();
                cout <<" " << op <<" ";
                y.Print();
                cout << " = "; 
                z.Print();
		cout <<"\n";
                cout << "********************************************" << endl;
		        	
       		cout << "\n"; 
                cout << "Input x (n/d, -1/1 to quit): ";
                cin >> n >> dummy >> d;   
        }
                
        return 0;
}