// static or dynamic binding of data?
#include <iostream>
#include <string>
using namespace std;
class B
{
  public:
	string s;
}; // B


class D : public B
{
  public:
	string s;
}; // D


main()
{
	B b;  b.s="B";
	cout << "b.s = "<< b.s << endl;
	D d;  d.s="D"; d.B::s="B::D";
	cout <<"d.s =" << d.s << endl;
	cout << "d.B::s =" << d.B::s << endl;

	B* p;
	p=&b;
	cout << "p->s =" << p->s << endl;
	p=&d;
	cout << "p->s =" << p->s << endl;
	

}