cpp_yandex/01_White_belt/04 Streams, overloads, exceptions, classes/09_1_Rational_interface.cpp at master · romanwrites/cpp_yandex · GitHub

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#include <iostream>
#include <numeric>
using namespace std;

class Rational {
public:
    Rational() {
        num = 0;
        denum = 1;
    }

    Rational(int numerator, int denominator) {
		int div = gcd(numerator, denominator);

		if (numerator < 0 && denominator < 0) {
			denum = abs(denominator) / div;
			num = abs(numerator) / div;
		} else if (denominator < 0) {
			denum = abs(denominator) / div;
			num = numerator / div;
			num = -num;
    	} else {
			denum = denominator / div;
			num = numerator / div;
    	}
    }

    int Numerator() const {
        return num;
    }

    int Denominator() const {
		return denum;
    }

private:
    int num;
    int denum;
};

int main() {
    {
        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;
}