// Fig. 27.6: StackTest.cs
// Demonstrating class Stack.
using System;
using System.Collections;

public class StackTest
{
   public static void Main( string[] args )
   {
      Stack stack = new Stack(); // default Capacity of 10

      // create objects to store in the stack
      bool aBoolean = true;
      char aCharacter = '$';
      int anInteger = 34567;
      string aString = "hello";

      // use method Push to add items to (the top of) the stack
      stack.Push( aBoolean );                 
      PrintStack( stack );                          
      stack.Push( aCharacter );
      PrintStack( stack );                           
      stack.Push( anInteger );
      PrintStack( stack );                           
      stack.Push( aString );
      PrintStack( stack );                           

      // check the top element of the stack
      Console.WriteLine( "The top element of the stack is {0}\n", 
         stack.Peek() );

      // remove items from stack
      try
      {
         while ( true )
         {
            object removedObject = stack.Pop();
            Console.WriteLine( removedObject + " popped" );
            PrintStack( stack );   
         } // end while
      } // end try
      catch ( InvalidOperationException exception )
      {
         // if exception occurs, print stack trace
         Console.Error.WriteLine( exception );
      } // end catch
   } // end Main

   // print the contents of a stack
   private static void PrintStack( Stack stack )
   {
      if ( stack.Count == 0 )
         Console.WriteLine( "stack is empty\n" ); // the stack is empty
      else
      {
         Console.Write( "The stack is: " );

         // iterate through the stack with a foreach statement
         foreach ( object element in stack )
            Console.Write( "{0} ", element ); // invokes ToString

         Console.WriteLine( "\n" );
      } // end else
   } // end method PrintStack
} // end class StackTest


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