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Naive bijective function in C#. http://stackoverflow.com/questions/742013
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namespace Alphabet | |
{ | |
public class AlphabetTest | |
{ | |
public static readonly string Alphabet = "abcdefghijklmnopqrstuvwxyz0123456789"; | |
public static readonly int Base = Alphabet.Length; | |
public static string Encode(int i) | |
{ | |
if (i == 0) return Alphabet[0].ToString(); | |
var s = string.Empty; | |
while (i > 0) | |
{ | |
s += Alphabet[i % Base]; | |
i = i / Base; | |
} | |
return string.Join(string.Empty, s.Reverse()); | |
} | |
public static int Decode(string s) | |
{ | |
var i = 0; | |
foreach (var c in s) | |
{ | |
i = (i * Base) + Alphabet.IndexOf(c); | |
} | |
return i; | |
} | |
public static void Main(string[] args) | |
{ | |
// Simple test of encode/decode operations | |
for (var i = 0; i < 10000; i++) | |
{ | |
if (Decode(Encode(i)) != i) | |
{ | |
System.Console.WriteLine("{0} is not {1}", Encode(i), i); | |
break; | |
} | |
} | |
} | |
} | |
} |
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