Algorithm::CheckDigits::MBase_002(3)

NAME
CheckDigits::MBase_002 - compute check digits for blood bags (DE), BZÜ (DE), VAT Registration Number (DE)

SYNOPSIS
  use Algorithm::CheckDigits;

  $bb = CheckDigits('blutbeutel');

  if ($bb->is_valid('2761011234567893')) {
        # do something
  }

  $cn = $bb->complete('276101123456789');
  # $cn = '2761011234567893'

  $cd = $bb->checkdigit('2761011234567893');
  # $cd = '3'

  $bn = $bb->basenumber('2761011234567893');
  # $bn = '276101123456789';

DESCRIPTION

  ALGORITHM

1.  Start with values P = 10, S = 0.

2.  Beginning left you do the following for all digits

    1.  S = (P + digit) modulo 10

    2.  If S is 0 then S = 10.

    3.  P = (2 * S) modulo 11

3.  The check digit is (11 - P) modulo 10.

  METHODS

is_valid($number)
    Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.

    Returns false otherwise,

complete($number)
    The check digit for $number is computed and concatenated to the end of $number.

    Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.

basenumber($number)
    Returns the basenumber of $number if $number has a valid check digit.

    Return '' otherwise.

checkdigit($number)
    Returns the checkdigit of $number if $number has a valid check digit.

    Return '' otherwise.

  EXPORT
None by default.

AUTHOR
Mathias Weidner, "<mamawe@cpan.org>"

SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de, www.eurocode.org.