Algorithm::CheckDigits::MXX_004(3)

NAME
CheckDigits::MXX_004 - compute check digits for VAT RN (AT)

SYNOPSIS
  use Algorithm::CheckDigits;

  $vat = CheckDigits('ustid_at');

  if ($vat->is_valid('U13585627')) {
        # do something
  }

  $cn = $vat->complete('U1358562');
  # $cn = 'U13585627'

  $cd = $vat->checkdigit('U13585627');
  # $cd = '7'

  $bn = $vat->basenumber('U13585627');
  # $bn = 'U1358562'

DESCRIPTION

  ALGORITHM

1.  Beginning right all numbers before the check digit are weighted alternatively 1 and 2.

2.  The total of the digits of all products is computed and then subtracted from 96.

3.  The check digit is the sum of step 3 taken modulo 10.

  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>"

SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de.