Algorithm::CheckDigits::MXX_003(3pm) User Contributed Perl Documentation Algorithm::CheckDigits::MXX_003(3pm)

CheckDigits::MXX_003 - compute check digits for DEM

  use Algorithm::CheckDigits;
  $dem = CheckDigits('dem');
  if ($dem->is_valid('GD0645027K1')) {
        # do something
  }
  $cn = $dem->complete('GD0645027K');
  # $cn = 'GD0645027K1'
  $cd = $dem->checkdigit('GD0645027K1');
  # $cd = '1'
  $bn = $dem->basenumber('GD0645027K1');
  # $bn = 'GD0645027K'

ALGORITHM

The algorithm is a variation of the Verhoeff scheme.

0
All letters are changed to numbers.
1
All digits are permutated according to a permutation table.
2
The permutated digits are combined using a dieeder table. The first with the second, the result with the third, this result with the fourth and so on.
3
The result of the last combination in the dieeder table is in such a way combined that the result is 0 (zero). The number used for this combination is the checksum.

For details look at the source.

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, "<mamawe@cpan.org>"

perl, CheckDigits, www.pruefziffernberechnung.de,

2022-10-13 perl v5.36.0