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Noia e 5 minuti di cazzeggio e si torna sui banchi di scuola :-p

using System;
using System.Text;

namespace CSharpLab
{
 public /* static */ class ConvertitoreNumerico
 {
  #region Simboli
  static readonly char[] SIMBOLI_2 = 
   {'0', '1'};
  
  static readonly char[] SIMBOLI_7 = 
   {'0', '1', '2', '3', '4', '5', '6'};
  static readonly char[] SIMBOLI_10 = 
   {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
  static readonly char[] SIMBOLI_16 = 
   {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
  
  static readonly char[] SIMBOLI_26 = 
   {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 
   'N', 'O','P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
  #endregion

  #region Metodi di conversione in stringa

  public static string ConvertiInBase26(int number)
  {
   return ConvertiNumero(number, SIMBOLI_26);
  }

  public static string ConvertiInBase16(int number)
  {   
   return ConvertiNumero(number, SIMBOLI_16);
  }

  public static string ConvertiInBase10(int number)
  {   
   return ConvertiNumero(number, SIMBOLI_10);
  }

  public static string ConvertiInBase7(int number)
  {   
   return ConvertiNumero(number, SIMBOLI_7);
  }

  public static string ConvertiInBase2(int number)
  {   
   return ConvertiNumero(number, SIMBOLI_2);
  }

  public static string ConvertiNumero(int number, char[] symbols)
  {
   int b = symbols.Length;
   int n = number;
   StringBuilder sb = new StringBuilder();
   while(n > 0)
   {
    int mod;
    n = Math.DivRem(n, b, out mod);
    sb.Insert(0, symbols[mod]);
   }
   return sb.ToString();
  }
  #endregion

  #region Metodi di conversione da stringa 
  public static int ConvertiInNumeroDaBase26(string value)
  {
   return ConvertiInNumero(value, SIMBOLI_26);
  }

  public static int ConvertiInNumeroDaBase16(string value)
  {
   return ConvertiInNumero(value, SIMBOLI_16);
  }

  public static int ConvertiInNumeroDaBase10(string value)
  {
   return ConvertiInNumero(value, SIMBOLI_10);
  }

  public static int ConvertiInNumeroDaBase7(string value)
  {
   return ConvertiInNumero(value, SIMBOLI_7);
  }

  public static int ConvertiInNumeroDaBase2(string value)
  {
   return ConvertiInNumero(value, SIMBOLI_2);
  }

  public static int ConvertiInNumero(string value, char[] symbols)
  {
   int n = 0;
   int sz = value.Length;
   int b = symbols.Length;
   for(int i = 0, j = sz - 1; i < sz; i++, j--)
   {
    char symbol = value[j];
    int p = Array.BinarySearch(symbols, symbol);
    if(p == -1)
    {
     throw new ArgumentException(
      string.Format("Symbol not found: {0}", symbol), "value");
    }
    n += (int)Math.Pow(b, i) * p;
   }
   return n;
  }
  #endregion
 }
}

posted @ martedì 1 febbraio 2005 00:26