Ubuntu Manpages

CheckDigits::M10_005

compute check digits for Deutsche Post Identcode/Leitcode (DE)

  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'

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

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.