#include "pch.h"
#include <iostream>
#include <sstream>
#include <fstream>
#include <algorithm>
#include <vector>
using namespace std;
class Rational
{
public:
    Rational()
    {
        numenator = 0;
        denominator = 1;
    }

    Rational(int num, int denom) //Конструктор должен делать дробь несократимой
    {
        numenator = num;
        denominator = denom;
        int tmp = nod(num, denom);
        numenator /= tmp;
        denominator /= tmp;
        if(denominator < 0)
        {
            denominator *= -1;
            numenator *= -1;
        }
    }

    int Numerator() const //Возвращает числитель
    {
        return numenator;
    }

    int Denominator() const  //Возвращает знаминатель
    {
        return denominator;
    }
private:
    int numenator;
    int denominator;

    int nod(int a, int b)
    {
        int tmp = max(a, b);
        while((a % tmp != 0) || (b % tmp != 0))
        {
            tmp--;
        }
        return tmp;
    }

};

bool operator==(const Rational& r1, const Rational& r2)
{
    if((r1.Denominator()==r2.Denominator())&&(r1.Numerator()==r2.Numerator()))
    {
        return true;
    }
    else
    {
        return false;
    }
}

Rational operator*(const Rational& r1, const Rational& r2)
{
    Rational ret(r1.Numerator()*r2.Numerator(), r1.Denominator()*r2.Denominator());
    return ret;
}

Rational operator/(const Rational& r1, const Rational& r2)
{
    Rational ret(r1.Numerator() * r2.Denominator(), r1.Denominator() * r2.Numerator());
    return ret;
}

Rational operator+(const Rational& r1, const Rational& r2)
{
    int num1 = r1.Numerator();
    int num2 = r2.Numerator();
    int denom1 = r1.Denominator();
    int denom2 = r2.Denominator();
    if (denom1 == denom2)
    {
        Rational rat(num1 + num2, denom1);
        return rat;
    }
    int tmpdenom1 = denom1;
    int tmpdenom2 = denom2;
    num1 *= tmpdenom2;
    denom1 *= tmpdenom2;
    num2 *= tmpdenom1;
    denom2 *= tmpdenom1;
    Rational rat(num1+num2, denom1);
    return rat;
}

Rational operator-(const Rational& r1, const Rational& r2)
{
    int num1 = r1.Numerator();
    int num2 = r2.Numerator();
    int denom1 = r1.Denominator();
    int denom2 = r2.Denominator();
    if (denom1 == denom2)
    {
        Rational rat(num1 - num2, denom1);
        return rat;
    }
    int tmpdenom1 = denom1;
    int tmpdenom2 = denom2;
    num1 *= tmpdenom2;
    denom1 *= tmpdenom2;
    num2 *= tmpdenom1;
    denom2 *= tmpdenom1;
    Rational rat(num1 - num2, denom1);
    return rat;
}

ostream& operator<<(ostream& stream, Rational rat)
{
    stream << rat.Numerator() << '/' << rat.Denominator();
    return stream;
}


int main()
{
    //Это всё тесты.
    {
        const Rational r(3, 10);
        if (r.Numerator() != 3 || r.Denominator() != 10)
        {
            cout << "Rational(3, 10) != 3/10" << endl;
            return 1;
        }
    }

    {
        const Rational r(8, 12);
        if (r.Numerator() != 2 || r.Denominator() != 3) {
            cout << "Rational(8, 12) != 2/3" << endl;
            return 2;
        }
    }


    {
        const Rational r(-4, 6);
        if (r.Numerator() != -2 || r.Denominator() != 3) {
            cout << "Rational(-4, 6) != -2/3" << endl;
            return 3;
        }
    }


    {
        const Rational r(4, -6);
        if (r.Numerator() != -2 || r.Denominator() != 3) {
            cout << "Rational(4, -6) != -2/3" << endl;
            return 3;
        }
    }

    {
        const Rational r(0, 15);
        if (r.Numerator() != 0 || r.Denominator() != 1) {
            cout << "Rational(0, 15) != 0/1" << endl;
            return 4;
        }
    }

    {
        const Rational defaultConstructed;
        if (defaultConstructed.Numerator() != 0 || defaultConstructed.Denominator() != 1) {
            cout << "Rational() != 0/1" << endl;
            return 5;
        }
    }

    cout << "OK" << endl;
    return 0;
}