練習題 (13)：Implement word wrapping feature (Observe how word wrap works in windows 'notepad')
這一題是實作 Winodws 中筆記本的【自動換行 】功能，自動換行就是以某各長度為限，但是又不能把單自從中切斷為主。
程式碼：
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using System;
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using System.Text;
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namespace Wrapping
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{
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internal class Program
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{
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private static void Main( string [ ] args)
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{
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String s = "Chien-Ming Wang tries to make it two straight wins for the Yankees. In his only start of this season -- because he's been held back by a hamstring injury -- Wang lost to the Devil Rays, giving up nine hits and four runs in 6 1/3 innings. \"Hopefully Wang can pick up where our pitching staff left off,\" Jeter said.";
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StringBuilder sb = new StringBuilder ( "" );
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int start = 0, indx = 0;
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const int LENGTH = 40;
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while (start <= s.Length )
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{
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if ( ( (start + LENGTH) <= s.Length ) && (s[start + LENGTH - 1 ] != ' ' ) )
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{
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string temp_s = s.Substring (start, LENGTH);
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indx = temp_s.LastIndexOf ( " " );
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string append = s.Substring (start, indx);
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sb.Append (append);
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sb.Append (Environment.NewLine );
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start += append.Length + 1;
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indx = 0;
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}
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else
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{
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if ( (start + LENGTH) <= s.Length )
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{
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sb.Append (s.Substring (start, LENGTH) );
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}
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else
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{
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sb.Append (s.Substring (start) );
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}
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sb.Append (Environment.NewLine );
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start += LENGTH;
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}
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}
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Console.Write (sb);
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}
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}
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}
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