NAME

CheckDigits::MBase_002 - compute check digits for blood bags (DE), BZUe (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>"