// Ex9_21.cpp : main project file.
  
  // Using a nested class to define a stack
  
  include <stdafx.h>
  include <Box.h>                       // For Box and Container
  include <GlassBox.h>                  // For GlassBox (and Box and Container)
  include <Stack.h>                     // For the generic stack class 
  
  using namespace System;
  
  int main(array<System::String ^> ^args)
  {
    array<Box^>^ boxes = { gcnew Box(2.0, 3.0, 4.0),
                           gcnew GlassBox(2.0, 3.0, 4.0),
                           gcnew Box(4.0, 5.0, 6.0),
                           gcnew GlassBox(4.0, 5.0, 6.0)
                         };
  
    Console::WriteLine(L"The array of boxes have the following volumes:");
    for each(Box^ box in boxes)
      box->ShowVolume();                           // Output the volume of a box
  
    Console::WriteLine(L"\nNow pushing the boxes on the stack...");
  
    Stack<Box^>^ stack = gcnew Stack<Box^>;        // Create the stack
    for each(Box^ box in boxes)
      stack->Push(box);
  
    
    Console::WriteLine(
                L"Popping the boxes off the stack presents them in reverse order:");
    Box^ item;
    while((item = stack->Pop()) != nullptr)
      safe_cast<Container^>(item)->ShowVolume();
  
    // Try the generic Stack type storing integers
    Stack<int>^ numbers = gcnew Stack<int>;        // Create the stack
    Console::WriteLine(L"\nNow pushing integers on to the stack:");
    for(int i = 2 ; i<=12 ; i += 2)
    { 
      Console::Write(L"{0,5}",i);
      numbers->Push(i);
    }
    int number;
    Console::WriteLine(L"\n\nPopping integers off the stack produces:");
    while((number = numbers->Pop()) != 0)
      Console::Write(L"{0,5}",number);
  
    Console::WriteLine();
    return 0;
  }