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  1. using System;
  2. using System.Diagnostics;
  3. using System.Text;
  4.  
  5. public class Test
  6. {
  7. 	static string ExpandStringGuffa(string str, int length) 
  8. 	{
  9.          if (length <= str.Length) return str.Substring(0, length);
  10.  
  11.          while (str.Length * 2 <= length) 
  12.          {
  13.              str += str;
  14.          }
  15.          if (str.Length < length)
  16.          {
  17.              str += str.Substring(0, length - str.Length);
  18.          }
  19.          return str;
  20.    }
  21.  
  22.     static string ExpandStringSb(string str, int length)
  23.     {
  24.         if (length <= str.Length) return str.Substring(0, length);
  25.  
  26.         var sb = new StringBuilder(str, length);
  27.         while (sb.Length * 2 <= length)
  28.         {
  29.             sb.Append(sb);
  30.         }
  31.         if (sb.Length < length)
  32.         {
  33.             sb.Append(sb.ToString(), 0, length - sb.Length);
  34.         }
  35.         return sb.ToString();
  36.     }
  37.  
  38.     static string ExpandStringCharArr(string str, int length)
  39.     {
  40.         var i = str.Length;
  41.         if (i >= length) return str.Substring(0, length);
  42.  
  43.         var result = new char[length];
  44.         Array.Copy(str.ToCharArray(), 0, result, 0, i);
  45.         while (i * 2 <= length)
  46.         {
  47.             Array.Copy(result, 0, result, i, i);
  48.             i *= 2;
  49.         }
  50.         if (i < length)
  51.         {
  52.             Array.Copy(result, 0, result, i, length - i);
  53.         }
  54.         return new String(result);
  55.     }
  56.  
  57. 	public static void Main()
  58. 	{
  59. 		Console.WriteLine("Guffa\t\t\tStringBuilder\t\t\tCharArray");
  60. 		Console.WriteLine("-------------------------------------------------");
  61.  
  62. 		var sw = new Stopwatch();
  63.  
  64. 		sw.Restart();
  65. 		for(var i = 0; i < 1000; i++) ExpandStringGuffa("Test", i);
  66. 		sw.Stop();
  67. 		Console.Write(sw.ElapsedTicks + "\t\t\t");
  68.  
  69. 		sw.Restart();
  70. 		for(var i = 5; i < 1000; i++) ExpandStringSb("Test", i);
  71. 		sw.Stop();
  72. 		Console.Write(sw.ElapsedTicks + "\t\t\t\t\t");
  73.  
  74. 		sw.Restart();
  75. 		for(var i = 5; i < 1000; i++) ExpandStringCharArr("Test", i);
  76. 		sw.Stop();
  77. 		Console.WriteLine(sw.ElapsedTicks);
  78.  
  79. 		sw.Restart();
  80. 		for(var i = 0; i < 1000; i++) ExpandStringGuffa("Test", i);
  81. 		sw.Stop();
  82. 		Console.Write(sw.ElapsedTicks + "\t\t\t");
  83.  
  84. 		sw.Restart();
  85. 		for(var i = 5; i < 1000; i++) ExpandStringSb("Test", i);
  86. 		sw.Stop();
  87. 		Console.Write(sw.ElapsedTicks + "\t\t\t\t\t");
  88.  
  89. 		sw.Restart();
  90. 		for(var i = 5; i < 1000; i++) ExpandStringCharArr("Test", i);
  91. 		sw.Stop();
  92. 		Console.WriteLine(sw.ElapsedTicks);
  93.  
  94. 		sw.Restart();
  95. 		for(var i = 0; i < 1000; i++) ExpandStringGuffa("Test", i);
  96. 		sw.Stop();
  97. 		Console.Write(sw.ElapsedTicks + "\t\t\t");
  98.  
  99. 		sw.Restart();
  100. 		for(var i = 5; i < 1000; i++) ExpandStringSb("Test", i);
  101. 		sw.Stop();
  102. 		Console.Write(sw.ElapsedTicks + "\t\t\t\t\t");
  103.  
  104. 		sw.Restart();
  105. 		for(var i = 5; i < 1000; i++) ExpandStringCharArr("Test", i);
  106. 		sw.Stop();
  107. 		Console.WriteLine(sw.ElapsedTicks);
  108. 	}
  109. }
Success #stdin #stdout 0.06s 24240KB
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stdin
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Standard input is empty
stdout
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Guffa			StringBuilder			CharArray
-------------------------------------------------
53241			63808					33345
22059			30713					20208
21999			30956					20939
https://ideone.com/KanNgz
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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