void Quadrilateral::print(ostream &out, Quadrilateral &q)
{
	out << q.a << ' ' << q.b << ' ' << q.c << ' ' << q.d << endl;
	if(q.validate())
	{
		q.setDefault();
		out << "I am not a quadrilateral, I have set myself to one\n";
		out << q.a << ' ' << q.b << ' ' << q.c << ' ' << q.d << endl;
	}
	else
	{
		out << "I am a quadrilateral.\n";
	}
	return;
}