//////////////////
// MT1Q3.cpp 

#include <iostream>

class B
{
public:
  B(double d=0) : _d(d) {}
  virtual ~B() {}
  double& BValue() { return _d; }
  virtual void say()
  {
    std::cout << "\n  a B here";
  }
private:
  double _d;
};

class D : public B
{
public:
  D(int i=0) : _i(i) {}
  D(const D& d) : B(d), _i(d._i) {} 
  int& DValue() { return _i; }
  virtual void say()
  {
    std::cout << "\n  a D here";
    std::cout << "\n  my _i is: " << _i;
    std::cout << "\n  my base's _d is " << BValue();
  }
private:
  int _i;
};

void main()
{
  D d(3);
  d.say();
  d.BValue() = -2.5;
  std::cout << "\n  original D";
  d.say();
  std::cout << "\n  copy:";
  D d1 = d;
  d1.say();
  std::cout << "\n\n";
}