debian man page for algorithm::checkdigits::m11_008

CheckDigits::M11_008(3pm)				User Contributed Perl Documentation				 CheckDigits::M11_008(3pm)

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 hyphens and the two digits in the middle are valid check digits according
	   to the algorithm given above.

	   Returns false otherwise,

       complete($number)
	   The check digit for $number is computed and inserted into the middle of $number.

	   Returns the complete number with check digit or '' if $number does not consist solely of digits, hyphens and spaces.

       basenumber($number)
	   Returns the basenumber of $number if $number has a valid check digit.

	   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 v5.10.0							    2008-05-17						 CheckDigits::M11_008(3pm)