NAME

CheckDigits::M10_005 - compute check digits for Deutsche Post Identcode/Leitcode (DE)

SYNOPSIS

  use Algorithm::CheckDigits;

  $ic = CheckDigits('identcode_dp');

  if ($ic->is_valid('21.802 580.906 6')) {
        # do something
  }

  $cn = $ic->complete('21.802 580.906');
  # $cn = '21.802 580.9066'

  $cd = $ic->checkdigit('21.802 580.906 6');
  # $cd = '6'

  $bn = $ic->basenumber('21.802 580.906 6');
  # $bn = '21.802 580.906'

DESCRIPTION

ALGORITHM

1.: Beginning left all numbers are weighted alternatively 4 and 9.
2.: The sum 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.

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>"