CheckDigits::M11_008(3User Contributed Perl DocumentatiCheckDigits::M11_008(3)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,
perl v5.14.1 2009-11-20 CheckDigits::M11_008(3)
