DOKK / manpages / debian 12 / libalgorithm-checkdigits-perl / Algorithm::CheckDigits::M11_013.3pm.en
Algorithm::CheckDigits::M11_013(3pm) User Contributed Perl Documentation Algorithm::CheckDigits::M11_013(3pm)

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';

ALGORITHM

1.
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.
2.
The weighted digits are added.
3.
The sum from step 2 is taken modulo 11.
4.
If the sum from step 3 is greater than 9, the check sum is 0 else it is the sum itself.

METHODS

Returns true only if $number consists solely of numbers and the rightmost digit is a valid check digit according to the algorithm given above.

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.

Return '' otherwise.

EXPORT

None by default.

Mathias Weidner, "<mamawe@cpan.org>"

perl, CheckDigits, www.pruefziffernberechnung.de,

2022-10-13 perl v5.34.0