#include <iostream>
using namespace std;

template <typename T> class point;

template<class T>
ostream& operator<<(ostream& out, point<T> p)
{
	out << "(" << p.x <<"," << p.y << ") " ;
	return out;
}

template < class T>
class point
{
	public:
		point():x(0), y(0){}
		point(T a, T b = 0):x(a), y(b){}
		void print()const{cout << "(" << x << "," << y << ") ";}
		template < typename T2 > 
			friend ostream& operator<<(ostream& out, point<T2> p);
	private:
		T x, y;
};



int main()
{
	// template simple class
	cout << "use of simple template class"<< endl;
	point<int> a(8,9);
	a.print();
	cout << endl;
	cout << a << endl;
	point<double> b(3.5);
	b.print();
	cout << endl;
	point< point<int> > c(a, a);
	cout << c << endl;
	c.print();
	cout << endl;
	return 0;
}