int RationalNumber::add(RationalNumber rnum)
{
    RationalNumber temp;
    int a, b, c, d;

    a = this->getNumberator() * rnum.getDenominator();
    b = this->getDenominator() * rnum.getDenominator();
    c = this->getDenominator() * rnum.getNumberator();
    d = this->getDenominator() * rnum.getDenominator();


}