Спринт 4. Список инициализации конструктора.

#include <numeric>

using namespace std;

class Rational {
public:
    Rational() = default;

    Rational(int numerator)

        :numerator_(numerator)
    {
        denominator_ = 1;
    }

    Rational(int numerator, int denominator)

        :numerator_(numerator), denominator_(denominator)

    {
        Normalize();
    }

    int Numerator() const {
        return numerator_;
    }

    int Denominator() const {
        return denominator_;
    }

private:
    void Normalize() {
        if (denominator_ < 0) {
            numerator_ = -numerator_;
            denominator_ = -denominator_;
        }
        const int divisor = gcd(numerator_, denominator_);
        numerator_ /= divisor;
        denominator_ /= divisor;
    }

    int numerator_ = 0;
    int denominator_ = 1;
};