#include <iostream>

class Fraction
{
private:
    int nod(int x, int y)
    {
        while (x != y)
        {
            if (x > y)
            {
                int temp = x;
                x = y;
                y = temp;
            }
            y -= x;
        }
        return x;
    }

    int nok(int x, int y)
    {
        return x * y / nod(x, y);
    }

    int shorten(int num, int nodd)
    {
        return num / nodd;
    }
    void null(int denum)
    {
        if (denum == 0) std::cerr << "denum can't be null!" << std::endl;
    }

public:
    int numerator, denominator;

    Fraction operator+ (Fraction& F)
    {
        null(this->denominator);
        null(F.denominator);

        Fraction result;
        if (this->denominator == F.denominator)
        {
            result.numerator = this->numerator + F.numerator;
            result.denominator = this->denominator;
        }
        else
        {
            int nokk = nok(this->denominator, F.denominator);
            int mul1, mul2;
            mul1= nokk / this->denominator;
            mul2 = nokk / F.denominator;

            result.numerator = this->numerator * mul1 + F.numerator * mul2;
            result.denominator = nokk;
        }


        return result;
    }

    Fraction operator- (Fraction& F)
    {
        null(this->denominator);
        null(F.denominator);

        Fraction result;
        if (this->denominator == F.denominator)
        {
            result.numerator = this->numerator - F.numerator;
            result.denominator = this->denominator;
        }
        else
        {
            int nokk = nok(this->denominator, F.denominator);
            int mul1, mul2;
            mul1 = nokk / this->denominator;
            mul2 = nokk / F.denominator;

            result.numerator = this->numerator * mul1 - F.numerator * mul2;
            result.denominator = nokk;
        }
        int resNod = nod(result.numerator, result.denominator);
        result.numerator /= resNod;
        result.denominator /= resNod;

        return result;
    }

    Fraction operator* (Fraction& F)
    {
        null(this->denominator);
        null(F.denominator);

        Fraction result;
        result.numerator = this->numerator * F.numerator;
        result.denominator = this->denominator * F.denominator;

        int resNod = nod(result.numerator, result.denominator);
        result.numerator /= resNod;
        result.denominator /= resNod;

        return result;
    }

    Fraction operator/ (Fraction& F)
    {
        null(this->denominator);
        null(F.denominator);

        Fraction result;
        result.numerator = this->numerator * F.denominator;
        result.denominator = this->denominator * F.numerator;

        int resNod = nod(result.numerator, result.denominator);
        result.numerator /= resNod;
        result.denominator /= resNod;

        return result;
    }

    void print()
    {
        std::cout << numerator << "/" << denominator << std::endl;
    }

};

int main()
{
   Fraction f1, f2;
   Fraction sum, dif, mul, div;
   f1.numerator = 8;
   f1.denominator = 16;
   f2.numerator = 9;
   f2.denominator = 81;


    sum = f1 + f2;
    dif = f1 - f2;
    mul = f1 * f2;
    div = f1 / f2;

    std::cout << "Results:" << std::endl;
    std::cout << "Sum : ";sum.print();
    std::cout << "Dif : ";dif.print();
    std::cout << "Mul : ";mul.print();
    std::cout << "Div : ";div.print();

    return 0;
}