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Manual Reference Pages  -  ALGORITHM::CHECKDIGITS::MXX_003 (3)

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NAME

CheckDigits::MXX_003 - compute check digits for DEM

CONTENTS

SYNOPSIS



  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



DESCRIPTION

    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

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>

THANKS

SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de,
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perl v5.20.3 ALGORITHM::CHECKDIGITS::MXX_003 (3) 2016-03-17

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