Algorithm::CheckDigits::M11_008.3pm

Langue: en

Version: 2009-11-20 (fedora - 01/12/10)

Section: 3 (Bibliothèques de fonctions)

NAME

CheckDigits::M11_008 - compute check digits for VAT Registration Number (DK)

SYNOPSIS

   use Algorithm::CheckDigits;
 
   $ustid = CheckDigits('ustid_dk');
 
   if ($ustid->is_valid('13585628')) {
         # do something
   }
 
   $cn = $ustid->complete('1358562');
   # $cn = '13585628'
 
   $cd = $ustid->checkdigit('13585628');
   # $cd = '8'
 
   $bn = $ustid->basenumber('13585628');
   # $bn = '1358562';
 
 

DESCRIPTION

ALGORITHM

1.
Beginning left every digit is weighted with 2, 7, 6, 5, 4, 3, 2, 1
2.
The weighted digits are added.
3.
The sum from step 2 is taken modulo 11.
4.
The number is valid if the sum from step 3 is zero (0).

METHODS

is_valid($number)
Returns true only if $number consists solely of numbers and the sum computed according to the algorithm given above is 0.

Returns false otherwise,

complete($number)
Returns $number if $number is valid according to the algorithm given above.

Return '' otherwise.

basenumber($number)
Returns $number if $number is valid according to the algorithm given above.

Return '' otherwise.

checkdigit($number)
Returns '' if $number is valid.

Return undef otherwise.

EXPORT

None by default.

AUTHOR

Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de,