Algorithm::CheckDigits::M10_005 (3pm)

  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'

\s-1ALGORITHM\s0

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.

\s-1METHODS\s0

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.

\s-1EXPORT\s0

None by default.

Mathias Weidner, <[email protected]>

perl, CheckDigits, www.pruefziffernberechnung.de.