練習題 (14)：Adding/removing items in the beginning, middle and end of the array.
這一題我使用泛型 List 類別來實作，利用 Add、Insert 方法來將原宿放置在各位置；利用 RemoveAt 方法來移除特定位置的元素。
程式碼：
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using System;
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using System.Collections.Generic;
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namespace ListTest
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{
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internal class Program
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{
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public static void printAll(List<int> l)
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{
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foreach ( int i in l)
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{
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Console.Write ( "{0} ", i);
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}
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Console.WriteLine ( );
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}
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private static void Main( string [ ] args)
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{
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List<int> l = new List<int> ( );
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l.Add ( 1 );
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l.Add ( 2 );
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l.Add ( 3 );
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l.Add ( 5 );
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l.Add ( 6 );
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l.Add ( 7 );
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l.Add ( 8 );
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printAll(l);
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// Add items in the beginning
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l.Insert ( 0, 0 );
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printAll(l);
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// Add items in the middle
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l.Insert ( 4, 4 );
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printAll(l);
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// Add items in the end
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l.Add ( 9 );
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printAll(l);
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// remove items in the beginning
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l.RemoveAt ( 0 );
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printAll(l);
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// remove items in the middle
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l.RemoveAt ( 3 );
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printAll(l);
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// remove items in the end
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l.RemoveAt (l.Count - 1 );
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printAll(l);
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printAll(l);
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}
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}
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}
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