Algorithm::CheckDigits::M10_009(3)

NAME
CheckDigits::M10_009 - compute check digits for Betriebsnummer (DE)

SYNOPSIS
  use Algorithm::CheckDigits;

  $betrnr = CheckDigits('betriebsnummer');

  if ($betrnr->is_valid('73282932000074')) {
        # do something
  }

  $cn = $betrnr->complete('7328293200007');
  # $cn = '73282932000074'

  $cd = $betrnr->checkdigit('73282932000074');
  # $cd = '4'

  $bn = $betrnr->basenumber('73282932000074');
  # $bn = '7328293200007'

DESCRIPTION

  ALGORITHM

1.  Beginning left all numbers are weighted alternatively 1 and 2.

2.  The total of the digits of all products is computed.

3.  The sum of step 3 ist taken modulo 10.

4.  The check digit is the difference between 10 and the number from step 3 taken modulo 10.

    HINT: The last digit of the 'Betriebsnummer' may be the check digit or the last digit of the sum of the constant 5 and the check digit.

  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.dsi.cnrs.fr/bureau_qualite/admindonnees/documents/siren.pdf