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CheckDigits::M10_009(3pm) User Contributed Perl Documentation CheckDigits::M10_009(3pm)

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

  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'

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

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,

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.

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

Return '' otherwise.

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

Return '' otherwise.

EXPORT

None by default.

Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

perl, CheckDigits, www.pruefziffernberechnung.de. www.dsi.cnrs.fr/bureau_qualite/admindonnees/documents/siren.pdf

2008-05-17 perl v5.10.0