table of contents
| Algorithm::CheckDigits::M11_011(3pm) | User Contributed Perl Documentation | Algorithm::CheckDigits::M11_011(3pm) |
NAME¶
CheckDigits::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, "<mamawe@cpan.org>"
COPYRIGHT AND LICENSE¶
Copyright 2004-2020 by Mathias Weidner
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
| 2021-11-17 | perl v5.40.0 |