CheckDigits::MBase_002(3pm)				User Contributed Perl Documentation			       CheckDigits::MBase_002(3pm)

NAME

       CheckDigits::MBase_002 - compute check digits for blood bags (DE), BZUe (DE), VAT Registration Number (DE)

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $bb = CheckDigits('blutbeutel');

	 if ($bb->is_valid('2761011234567893')) {
	       # do something
	 }

	 $cn = $bb->complete('276101123456789');
	 # $cn = '2761011234567893'

	 $cd = $bb->checkdigit('2761011234567893');
	 # $cd = '3'

	 $bn = $bb->basenumber('2761011234567893');
	 # $bn = '276101123456789';

DESCRIPTION

   ALGORITHM
       1.  Start with values P = 10, S = 0.

       2.  Beginning left you do the following for all digits

	   1.  S = (P + digit) modulo 10

	   2.  If S is 0 then S = 10.

	   3.  P = (2 * S) modulo 11

       3.  The check digit is (11 - P) modulo 10.

   METHODS
       is_valid($number)
	   Returns true only if $number consists solely of numbers and the last 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 concatenated to the end of $number.

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

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

	   Return '' otherwise.

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

	   Return '' otherwise.

   EXPORT
       None by default.

AUTHOR

       Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

SEE ALSO

       perl, CheckDigits, www.pruefziffernberechnung.de, www.eurocode.org.

perl v5.10.0							    2008-05-17					       CheckDigits::MBase_002(3pm)