Stack類代碼：
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using System;
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//using System.Collections.Generic;
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using System.Text;
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using System.Collections;
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namespace StackHelper
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{
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class StackHelper
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{
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private Stack list;
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public Stack List
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{
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set { list = value; }
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get { return list; }
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}
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public StackHelper()
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{
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list = new Stack();//注意：不是list=new StackHelper()
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Console.WriteLine("---------Stack-----------");
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}
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//壓入一個元素
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public void Add(object o)
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{
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list.Push(o);
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Console.WriteLine("壓入 元素：{0}",o);
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}
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//刪除棧頂元素
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&n
