Algorithm::CheckDigits::MBase_002 (3pm)

  use Algorithm::CheckDigits;

  $bb = CheckDigits('blutbeutel');

  if ($bb->is_valid('2761011234567893')) {
        # do something
  }

  $cn = $bb->complete('276101123456789');
  # $cn = '2761011234567893'

  $cd = $bb->checkdigit('2761011234567893');
  # $cd = '3'

  $bn = $bb->basenumber('2761011234567893');
  # $bn = '276101123456789';

\s-1ALGORITHM\s0

1.

Start with values P = 10, S = 0.

2.

Beginning left you do the following for all digits

1.

S = (P + digit) modulo 10

2.

If S is 0 then S = 10.

3.

P = (2 * S) modulo 11

3.

The check digit is (11 - P) modulo 10.

\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, www.eurocode.org.