#include 
     
      namespace Virtual{	class CBase	{	public:		CBase() {}		virtual ~CBase() {}		void testBase()		{			print();		}		virtual void print() = 0;	};	class CDived : public CBase	{	public:		CDived() {}		~CDived() {}        		void testDived() {testBase();}		void print() {std::cout << "CDived's print() is called!\n";}	};	void fun()	{		CDived p;		p.testDived();	}}