C# 練習題 (13)

2008-03-18

C# 練習題 (13)

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：

using System;
using System.Text;
namespace Wrapping
{
internal class Program
{
private static void Main( string [ ] args)
{
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.";
StringBuilder sb = new StringBuilder( "" );
int start = 0, indx = 0;
const int LENGTH = 40;
while (start <= s.Length )
{
if ( ( (start + LENGTH) <= s.Length ) && (s[start + LENGTH - 1 ] != ' ' ) )
{
string temp_s = s.Substring (start, LENGTH);
indx = temp_s.LastIndexOf ( " " );
string append = s.Substring (start, indx);
sb.Append (append);
sb.Append (Environment.NewLine );
start += append.Length + 1;
indx = 0;
}
else
{
if ( (start + LENGTH) <= s.Length )
{
sb.Append (s.Substring (start, LENGTH) );
}
else
{
sb.Append (s.Substring (start) );
}
sb.Append (Environment.NewLine );
start += LENGTH;
}
}
Console.Write (sb);
}
}
}