#include <iostream>

using namespace std;

class Rational {

public:

    Rational(int numerator, int denominator) {
        numerator_ = numerator;
        denominator_ = denominator;
        Reduction();
    }

    void print() {
        cout << numerator_ << '/' << denominator_ << endl;
    }

    void addition(const Rational& other) {
        numerator_ = numerator_ * other.denominator_ + other.numerator_ * denominator_;
        denominator_ = denominator_ * other.denominator_;
        Reduction();
    }

    void subtraction(const Rational& other) {
        numerator_ = numerator_ * other.denominator_ - other.numerator_ * denominator_;
        denominator_ = denominator_ * other.denominator_;
        Reduction();
    }

    void multiplication(const Rational& other) {
        numerator_ *= other.numerator_;
        denominator_ *= other.denominator_;
        Reduction();
    }

    void division(const Rational& other) {
        numerator_ *= other.denominator_;
        denominator_ *= other.numerator_;
        Reduction();
    }

private:
    int numerator_;
    int denominator_;

    void Reduction() { // сокращение дроби

        if (denominator_ < 0) {
            numerator_ *= -1;
            denominator_ *= -1;
        }

        int x = numerator_ < 0 ? -numerator_ : numerator_;
        int y = denominator_;

        while (x != y) {
            if (x > y) {
                x -= y;
            }
            else {
                y -= x;
            }
        }
        numerator_ /= x;
        denominator_ /= x;
    }
};


int main() {
    Rational r1(1, 2);
    Rational r2(3, 4);
    r1.print();
    r2.print();

    r1.addition(r2);
    r1.print();

    r1.subtraction(r2);
    r1.print();

    r1.multiplication(r2);
    r1.print();

    r1.division(r2);
    r1.print();
}