CheckDigits::M11_011(3User Contributed Perl DocumentatiCheckDigits::M11_011(3)NAMECheckDigits::M11_011 - compute check digits for VAT Registration Number
(NL)
SYNOPSIS
use Algorithm::CheckDigits;
$ustid = CheckDigits('ustid_nl');
if ($ustid->is_valid('123456782')) {
# do something
}
if ($ustid->is_valid('123456782B04')) {
# do something
}
$cn = $ustid->complete('12345678');
# $cn = '123456782'
$cn = $ustid->complete('12345678.B04');
# $cn = '123456782B04'
$cd = $ustid->checkdigit('123456782');
# $cd = '2'
$cd = $ustid->checkdigit('123456782B04');
# $cd = '2'
$bn = $ustid->basenumber('123456782');
# $bn = '12345678';
$bn = $ustid->basenumber('123456782B04');
# $bn = '12345678.B04';
DESCRIPTION
This VATRN has 12 "digits", the third last must be a B, the fourth last
is the checkdigit. I don't know anything about the meaning of the last
two digits.
You may use the whole VATRN or only the first eight digits to compute
the checkdigit with this module.
ALGORITHM
1. Beginning right with the digit before the checkdigit all digits are
weighted with their position. I.e. the digit before the checkdigit
is multiplied with 2, the next with 3 and so on.
2. The weighted digits are added.
3. The sum from step 2 is taken modulo 11.
4. If the sum from step 3 is 10, the number is discarded.
METHODS
is_valid($number)
Returns true only if the first eight positions of $number consist
solely of digits (maybe followed by 'B' and to further digits) and
the eighth digit is a valid check digit according to the algorithm
given above.
Returns false otherwise,
complete($number)
The check digit for $number is computed and inserted at position
eight of $number.
Returns the complete number with check digit or '' if $number does
not consist solely of digits a dot and maybe 'B' at the ninth
position.
basenumber($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.
EXPORT
None by default.
SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de,
AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
COPYRIGHT AND LICENSE
Copyright 2004,2005 by Mathias Weidner
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.14.1 2009-11-20 CheckDigits::M11_011(3)