C# Stack类

using System;
using System.Collections;

namespace CollectionsApplication {

   class Program {

      static void Main(string[] args) {
         Stack st = new Stack();

         st.Push('A');
         st.Push('M');
         st.Push('G');
         st.Push('W');

         Console.WriteLine("Current stack: ");
         foreach (char c in st) {
            Console.Write(c + " ");
         }
         Console.WriteLine();

         st.Push('V');
         st.Push('H');
         Console.WriteLine("The next poppable value in stack: {0}", st.Peek());
         Console.WriteLine("Current stack: ");
         foreach (char c in st) {
            Console.Write(c + " ");
         }

         Console.WriteLine();

         Console.WriteLine("Removing values ");
         st.Pop();
         st.Pop();
         st.Pop();

         Console.WriteLine("Current stack: ");
         foreach (char c in st) {
            Console.Write(c + " ");
         }
      }
   }
}