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Snippet Metadata
Summary: Generate Luhn
Language: C#
Author: Vidar Markussen
Author snippets RSS:
Culture: en-US
Bytes: 1222
Visual Studio 2005 Snippet:

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Code:
      /// 
      /// Input a KID number, and the return value is a mathematical
      /// Mod 10 value of this KID.
      /// 
      /// KID to be evaluated
      /// The Mod 10 Digit
      /// 
      /// KID: 0000001075000102004
      /// Check Digit: 7
      /// Math:
      ///  0 0 0 0 0 0 1 0 7 5 0 0 0 1 0 2 0 0 4
      ///  2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2
      /// +0+0+0+0+0+0+2+0+5+5+0+0+0+1+0+2+0+0+8 = 23
/// The digits in the two lines are Multiplicated
/// ex: 7*2 = 14 = 1+4 = 5 /// ex: 1*2 = 2 /// If Sum Exeeds 9 digits are added ex: 14 = 1+4 = 5 /// Take 10 - last digit = 10-3=7 /// CheckDigit is then 7 /// public int GenerateLuhn(string sInput) { int length = sInput.Length; int iLuhnKey; int sum = 0; int offset = length-1 % 2; byte[] digits = new System.Text.ASCIIEncoding().GetBytes(sInput); for (int i = 0; i < length; i++) { digits[i] -= 48; if (((i + offset) % 2) == 0) digits[i] *= 2; sum += (digits[i] > 9) ? digits[i] - 9 : digits[i]; } int iModulo = sum%10; if(iModulo > 0) iLuhnKey = 10 - iModulo; else iLuhnKey = 0; return iLuhnKey; }

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