#include <iostream>

class Base
{
public:
	virtual void Foo() { std::cout << "Base::Foo "; }
	virtual ~Base(){}
};

class Derived: public Base
{
public:
	void Foo(int k = 0) { std::cout << "Derived::Foo "; }
};

int main()
{
	Base *d = new Derived;
	d->Foo();
	delete d;
	return 0;
}