class Rational{

public:

    const Rational operator*( const Rational& rhs);

    Rational(int num);

private:

    int a;

};

Rational::Rational(int num) :a(num)

{

}

const Rational Rational::operator*(const Rational& rhs)

{

    return Rational(this->a * rhs.a);

}

int main()

{

    Rational a();

    Rational b();

    Rational c = a * b;

    return ;

}