Denomination

#include <string>
#include <vector>
#include <iostream>
#include <numeric>
#include <cmath>

using namespace std;
class Rational {
public:
    Rational() = default;
    //{
        //numerator_ = 0;
        //denominator_ = 1;
    //};

    Rational(int num)
    {
        numerator_ = num;
    }
    Rational(int num1, int num2)
    {
        if ( num2 != 0 )
        {
            numerator_ = num1;
            denominator_ = num2;
        }
    }

    int Numerator() const {
        return numerator_;
    }

    int Denominator() const {
        return denominator_;
    }
private:
    int numerator_ = 0;
    int denominator_ = 1;
};

Rational Add(Rational r1, Rational r2) {
    int numerator = r1.Numerator() * r2.Denominator() + r2.Numerator() * r1.Denominator();
    int denominator = r1.Denominator() * r2.Denominator();

    /* if (denominator < 0)
    {
        numerator *=  (-1);
        denominator *= (-1);
    }*/

    if ( denominator < 0 )
    {
        numerator = abs(numerator);
        denominator = abs(denominator);
    }

    int numerator_temp =  numerator / gcd(numerator, denominator);
    denominator = denominator / gcd(numerator, denominator);
    numerator = numerator_temp;
    // Создаём и возвращаем дробь с заданным числителем и знаменателем

    return Rational{numerator, denominator};
}
int main() {
    Rational zero;     // Дробь 0/1 = 0
    const Rational seven(7); // Дробь 7/1 = 7
    const Rational one_third(1, 3); // Дробь 1/3

    vector<Rational> numbers;
    numbers.push_back(Rational{7, 8});

    // Следующие 2 строки эквивалентны - добавляют в numbers дробь 3/1
    numbers.push_back(Rational{3});
    numbers.push_back(3);

    Rational sum = Add(Rational{1,6}, one_third);
    // Выведет 1/2
    cout << sum.Numerator() << "/" << sum.Denominator();
}