//	1/2 + 3/4 = ?
//	input a, b from keyboard

#include <iostream>
using namespace std;

class Fraction		// p.131
{	int nume;
	int deno;
	// reduce the fractions - p.115
	// void reduce();
public:
	// 0/1
	Fraction()
	{ 	nume = 0;
		deno = 1;
	}
	Fraction(int n, int d)
	{	nume = n;
		deno = d;
	}
	// function memebers
	void Set(int n, int d)
        {       nume = n;
                deno = d;
        }
	void Print() const
	{	cout << nume << "/" << deno; 	}
	Fraction Addition(Fraction x) 
	{	Fraction ans;		// temporary obj.	
		ans.nume = nume * x.deno + deno * x.nume;
		ans.deno = deno * x.deno;
		// use the reduce()
		// ????
		return  ans;
	}
	Fraction Subtraction(Fraction x)
        {       Fraction ans;           // temporary obj.
                ans.nume = nume * x.deno - deno * x.nume;
                ans.deno = deno * x.deno;
                return  ans;
        }
	Fraction Multiplication(Fraction x)
        {       Fraction ans;           // temporary obj.
                ans.nume = nume * x.nume;
                ans.deno = deno * x.deno;
                return  ans;
        }
	Fraction Divition(Fraction x)
        {       Fraction ans;           // temporary obj.
                ans.nume = nume * x.deno;
                ans.deno = deno * x.nume;
                return  ans;
        }

};

int main()
{
	Fraction a, b, c;	// c = a + b
	Fraction d, e, f;	// d = a - b; e = a * b
	int an, ad, bn, bd;
	cout << "The 1st fraction (nume, deno); ";
	cin >> an >> ad;
	cout << "The 2nd fraction (nume, deno); ";
	cin >> bn >> bd;
	a.Set(an, ad);	
	b.Set(bn, bd);
	
	c = a.Addition(b);
	e = a.Multiplication(b);
	a.Print();	// 1/2
	cout << " + ";
	b.Print();	// 3/4
	cout << " = ";
	c.Print();
	cout << "\n\n";
        a.Print();      // 1/2
        cout << " * ";
        b.Print();      // 3/4
        cout << " = ";
	e.Print();

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