NAME

CheckDigits::M89_001 - compute check digits for VAT Registration Number (LU)

SYNOPSIS

  use Algorithm::CheckDigits;

  $ustid = CheckDigits('ustid_lu');

  if ($ustid->is_valid('13669580')) {
        # do something
  }

  $cn = $ustid->complete('136695');
  # $cn = '13669580'

  $cd = $ustid->checkdigit('13669580');
  # $cd = '80'

  $bn = $ustid->basenumber('13669580');
  # $bn = '136695'

DESCRIPTION

ALGORITHM

1. The checksum is the whole number taken modulo 89.

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.