Algorithm::CheckDigits::M11_006 (3pm)

  use Algorithm::CheckDigits;

  $ccc = CheckDigits('ccc_es');

  if ($ccc->is_valid('2420-0730-27-0050103552')) {
        # do something
  }

  $cn = $ccc->complete('2420-0730-  -0050103552');
  # $cn = '2420-0730-27-0050103552'

  $cd = $ccc->checkdigit('2420-0730-27-0050103552');
  # $cd = '27'

  $bn = $ccc->basenumber('2420-0730-27-0050103552');
  # $bn = '2420-0730-  -0050103552';

\s-1ALGORITHM\s0

1.

Beginning right all digits are weighted 6,3,7,9,10,5,8,4,2,1.

2.

The weighted digits are added.

3.

The sum of step 2 is taken modulo 11.

4.

The checkdigit is 11 minus the sum from step 3. If the difference is 10, the checkdigit is 1. If the difference is 11, the checkdigit is 0.

\s-1METHODS\s0

is_valid($number)

Returns true only if $number consists solely of numbers and hyphens and the two digits in the middle are valid check digits according to the algorithm given above. Returns false otherwise,

complete($number)

The check digit for $number is computed and inserted into the middle of $number. Returns the complete number with check digit or '' if $number does not consist solely of digits, hyphens and spaces.

basenumber($number)

Returns the basenumber of $number if $number has a valid check digit. Return '' otherwise.

checkdigit($number)

Returns the check digits of $number if $number has valid check digits. Return '' otherwise.

\s-1EXPORT\s0

None by default.

Mathias Weidner, <[email protected]>

perl, CheckDigits, www.pruefziffernberechnung.de,