CheckDigits::M11_013 - compute check digits for VAT Registration Number (GR)
use Algorithm::CheckDigits; $ustid = CheckDigits('ustid_gr'); if ($ustid->is_valid('123456783')) { # do something } $cn = $ustid->complete('12345678'); # $cn = '123456783' $cd = $ustid->checkdigit('123456783'); # $cd = '3' $bn = $ustid->basenumber('123456783'); # $bn = '12345678';
Beginning right with the digit before the checkdigit all digits are weighted with 2 ** position. I. e. the last digit is multiplied with 2, the next with 4, then 8 and so on.
The weighted digits are added.
The sum from step 2 is taken modulo 11.
If the sum from step 3 is greater than 9, the check sum is 0 else it is the sum itself.
Returns true only if $number consists solely of numbers and the rightmost digit is a valid check digit according to the algorithm given above.
$number
Returns false otherwise,
The check digit for $number is computed and appended to the end of $number.
Returns the complete number with check digit or '' if $number does not consist solely of digits.
Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
Returns the check digits of $number if $number has valid check digits.
None by default.
Mathias Weidner, <mamawe@cpan.org>
<mamawe@cpan.org>
perl, CheckDigits, www.pruefziffernberechnung.de,
To install Algorithm::CheckDigits, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Algorithm::CheckDigits
CPAN shell
perl -MCPAN -e shell install Algorithm::CheckDigits
For more information on module installation, please visit the detailed CPAN module installation guide.