number_ptr Whole::add(const Number& numb) const{
		Complex* c;
		Real* re;
		Rational* ra;
		number_ptr res;
		switch (numb.get_type()) {
			case COMPLEX:
				c = new Complex(this->get_real_value(), 0);
				res = c->add(numb);
				delete c;
				return res;
				break;
			case REAL:
				re = new Real(this->get_real_value());
				res = re->add(numb);
				delete re;
				return res;
				break;
			case RATIONAL:
				ra = new Rational(this->get_real_value(), 1);
				res = ra->add(numb);
				delete ra;
				return res;
				break;
			default:
				break;
		}
		Whole param = *(dynamic_cast<const Whole*>(&numb));
		number_ptr w_res(new Whole(int(get_real_value()+param.get_real_value())));
		return w_res;
	}