// CS212 CS 2 Assignment 3
// Due: Monday February 28, 2011
//
// File Name: cs2assign3.cpp
// Author: Jennifer Whiley
// Instuctor: Dr. Wang
//
// Compile: g++ cs2assign3.cpp
// Run: ./a.out < in2.txt > out3.txt
// Goal: The program will read fractions (using class)
//       and output each student's average to a file called out3.txt;
//       the program will perform the operations indicated.
//   	 ("+", "-", "*", "/")

#include <iostream>
using namespace std;

class Fraction
{
        int numr;
        int deno;
	void reduce()
	{	
		int n = numr;
		int d = deno;


		while(d != 0)
		{
			int f = n % d;
			n = d;
			d = f;
		}
		if (n != 0)
		{
			numr /= n;
			deno /= n;
		}
		if (deno < 0)
		{
			numr *= (-1);
			deno *= (-1);
		}
	}
public:
	Fraction()
	{
                numr = 0;
                deno = 1;
	}
	Fraction(int n, int d)
        {
                numr = n;
                deno = d;
        }
        void Set(int n, int d)
        {       numr = n;
                deno = d;
        }
        void Print()    const
        {
                cout << numr << "/" << deno;
        }
        Fraction operator+(Fraction x)
        {
                Fraction ans;
                ans.numr = (numr * x.deno) + (deno * x.numr);
                ans.deno = deno * x.deno;
		ans.Set(ans.numr,ans.deno);
                ans.reduce(); 
                return ans;

        }
        Fraction operator- (Fraction x)
        {
                Fraction sub;
                sub.numr = (numr * x.deno) - (deno * x.numr);
                sub.deno = deno * x.deno;
                sub.Set(sub.numr,sub.deno);
                sub.reduce();
                return sub;

	}	
	Fraction operator* (Fraction x)
	{
		Fraction mult;
		mult.numr = numr * x.numr;
		mult.deno = deno * x.deno;
                mult.Set(mult.numr,mult.deno);
                mult.reduce();
		return mult;

	}
	Fraction operator/(Fraction x)
	{
		Fraction div;
		div.numr = numr * x.deno;
		div.deno = deno * x.numr;
                div.Set(div.numr,div.deno);
                div.reduce();
		return div;

	}
};

int main()
{	
	Fraction a;
        Fraction b;
        Fraction c;

	int an, ad;
	int bn, bd;
	char dummy;
	char opr;


	while(cin)
	{
		cin >> an >> dummy >> ad >> opr >> bn >> dummy >> bd;
                
	        a.Set(an, ad);
        	b.Set(bn, bd);

		if (opr == '+')
		{
       	 		c = a + b;
//			a.Print();
//			cout << " " << opr << " ";
//			b.Print();
//			cout << " = ";
//			c.Print();
//			cout << "\n";
		}
		
			if (opr == '-')
			{
				c = a - b;
//		        	a.Print();                                                    
//                        	cout << " " << opr << " ";
//                        	b.Print();
//                        	cout << " = ";
//                        	c.Print();
//                        	cout << "\n";
			}
		
			if (opr == '*')
			{
				c = a * b;
//                        	a.Print();                                                    
//                        	cout << " " << opr << " ";
//                        	b.Print();
//                        	cout << " = ";
//                        	c.Print();
//                        	cout << "\n";
			}
		 
			if (opr == '/' && "\n")
			{		
				c = a / b;
//				a.Print();
//				cout << " " << opr << " ";
//				b.Print();
//				cout << " = ";
//				c.Print();
//				cout << "\n";
			}
		a.Print();
                cout << " " << opr << " ";
                b.Print();
                cout << " = ";
                c.Print();
		cout << "\n";
	}
	return 0;
}