集合之栈

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace TestConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            Stack sk = new Stack();

            Stack sk2 = new Stack();

            foreach (int i in new int[4] { 1, 2, 3, 4 })
            {
                sk.Push(i);//入栈
                sk2.Push(i);//入栈
            }

            foreach (int i in sk)//遍历输出入栈元素
            {
                Console.WriteLine(i);
            }

            sk.Pop();//移除栈顶元素

            Console.WriteLine("出栈");

            foreach (int i in sk) //遍历出栈的元素
            {
                Console.WriteLine(i);
            }

            sk2.Peek();//返回栈顶对象，但不将其移除

            Console.WriteLine("-----");

            foreach (int i in sk2)
            {
                Console.WriteLine(i);
            }

            while (sk2.Count != 0)
            {
                int i = (int)sk2.Pop();//清空
                sk2.Pop();//清空
            }
           
               Console.WriteLine("清空");
               foreach(int i in sk2)
               {
                    Console.WriteLine(i);
               }

          
        }
    }
}