// Ex9_13.cpp
  // Using a nested class to define a stack
  include <Box.h>                       // For CBox and CContainer
  include <GlassBox.h>                  // For CGlassBox (and CBox and CContainer)
  include <Stack.h>                     // For the stack class with nested struct Item 
  
  include <iostream>                    // For stream I/O
  using std::cout;
  using std::endl;
  
  int main()
  {
    CBox* pBoxes[] = { new CBox(2.0, 3.0, 4.0),
                       new CGlassBox(2.0, 3.0, 4.0),
                       new CBox(4.0, 5.0, 6.0),
                       new CGlassBox(4.0, 5.0, 6.0)
                     };
  
    cout << "The array of boxes have the following volumes:";
    for (int i = 0 ; i<4 ; i++)
      pBoxes[i]->ShowVolume();           // Output the volume of a box
  
    cout << endl << endl
         << "Now pushing the boxes on the stack..."
         << endl;
  
    CStack* pStack = new CStack;         // Create the stack
    for (int i = 0 ; i<4 ; i++)
      pStack->Push(pBoxes[i]);
  
    
    cout << "Popping the boxes off the stack presents them in reverse order:";
    for (int i = 0 ; i<4 ; i++)
      pStack->Pop()->ShowVolume();
  
    cout << endl;
    return 0;
  }