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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Diagnostics;
  4. using System.Linq;
  5. using System.Text;
  6.  
  7. namespace dictionary_vs_switch
  8. {
  9.     class Program
  10.     {
  11.         static void Main()
  12.         {
  13.             char[] fromArr = Enumerable.Range('a', 'z' - 'a' + 1).Select(i => (char)i).ToArray();
  14.             char[] iterArr = new char[10000];
  15.             Random r = new Random();
  16.             for (int i = 0; i < iterArr.Length; i++)
  17.             {
  18.                 iterArr[i] = fromArr[r.Next(fromArr.Length)];
  19.             }
  20.             var result1 = new StringBuilder(iterArr.Length);
  21.             var result2 = new StringBuilder(iterArr.Length);
  22.             Stopwatch s1 = new Stopwatch();
  23.             Stopwatch s2 = new Stopwatch();
  24.  
  25.             Dictionary<char, char> d = new Dictionary<char, char>
  26.                 {
  27.                     {'a', 'а'},
  28.                     {'b', 'б'},
  29.                     {'c', 'ц'},
  30.                     {'d', 'д'},
  31.                     {'e', 'е'},
  32.                     {'f', 'ф'},
  33.                     {'g', 'г'},
  34.                     {'h', 'ш'},
  35.                     {'i', 'и'},
  36.                     {'j', 'й'},
  37.                     {'k', 'к'},
  38.                     {'l', 'л'},
  39.                     {'m', 'м'},
  40.                     {'n', 'н'},
  41.                     {'o', 'о'},
  42.                     {'p', 'п'},
  43.                     {'q', 'ы'},
  44.                     {'r', 'р'},
  45.                     {'s', 'с'},
  46.                     {'t', 'т'},
  47.                     {'u', 'у'},
  48.                     {'v', 'в'},
  49.                     {'w', 'ю'},
  50.                     {'x', 'ч'},
  51.                     {'y', 'я'},
  52.                     {'z', 'з'}
  53.                 };
  54.  
  55.             s1.Start();
  56.             foreach (char c in iterArr)
  57.             {
  58.                 result1.Append(d[c]);
  59.             }
  60.             s1.Stop();
  61.             s2.Start();
  62.             foreach (char c in iterArr)
  63.             {
  64.                 result2.Append(getChar(c));
  65.             }
  66.             s2.Stop();
  67.             Console.WriteLine("dictionary: " + s1.ElapsedTicks);
  68.             Console.WriteLine("switch:     " + s2.ElapsedTicks);
  69.             Console.ReadKey();
  70.  
  71.         }
  72.  
  73.         private static char getChar(char c)
  74.         {
  75.             switch (c)
  76.             {
  77.                 case 'a': return 'а';
  78.                 case 'b': return 'б';
  79.                 case 'c': return 'ц';
  80.                 case 'd': return 'д';
  81.                 case 'e': return 'е';
  82.                 case 'f': return 'ф';
  83.                 case 'g': return 'г';
  84.                 case 'h': return 'ш';
  85.                 case 'i': return 'и';
  86.                 case 'j': return 'й';
  87.                 case 'k': return 'к';
  88.                 case 'l': return 'л';
  89.                 case 'm': return 'м';
  90.                 case 'n': return 'н';
  91.                 case 'o': return 'о';
  92.                 case 'p': return 'п';
  93.                 case 'q': return 'ы';
  94.                 case 'r': return 'р';
  95.                 case 's': return 'с';
  96.                 case 't': return 'т';
  97.                 case 'u': return 'у';
  98.                 case 'v': return 'в';
  99.                 case 'w': return 'ю';
  100.                 case 'x': return 'ч';
  101.                 case 'y': return 'я';
  102.                 case 'z': return 'з';
  103.                 default: return ' ';
  104.             }
  105.  
  106.         }
  107.     }
  108. }
Success #stdin #stdout 0.05s 34256KB
comments (?)
stdin
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Standard input is empty
stdout
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dictionary: 9854
switch:     4229
https://ideone.com/lV1rH5
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
secret

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