Untitled

friend ostream& operator<<(ostream& out, const PhanSo& a);
	
friend istream& operator>>(istream& in, PhanSo& a);


ostream& operator<<(ostream& out, const PhanSo& a)
{
	cout << "Tu so: " << a.TuSo << endl;
	cout << "Mau so: " << a.MauSo << endl;
	return out;
}


istream& operator>>(istream& in, PhanSo& a)
{
	cout << "Moi ban nhap Tu so:" << endl;
	cin >> a.TuSo;
	cout << "Moi ban nhap vao Mau so:" << endl;
	do {
		in >> a.MauSo;
	} while (a.MauSo == 0);
	return in;
}