//**********************************************************
//dynamic_cast convert pointer into same pointer
//it can't convert object's base pointer into
//derived pointer
//dynamic_cast<destination type>(espression)
//**********************************************************

#include <iostream>
using namespace std;

//----------------------------------------------------------
class base{
public:
	virtual void show(){cout<<"hello base!";}
}; 

class derived:public base{
public:
	void show(){cout<<"hello derived!";}
};

//===========================================================
int main(){
	base *bp, bob;
	derived *dp, dob;
	bp=&dob;
	bp->show();
	cout<<endl;
	dp=dynamic_cast<derived *>(bp);
	dp->show();
	cout<<endl;
	return 0;
}