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algorithm::checkdigits::m10_004(3pm) [debian man page]

CheckDigits::M10_004(3pm)				User Contributed Perl Documentation				 CheckDigits::M10_004(3pm)

NAME

       CheckDigits::M10_004 - compute check digits for 2aus5, EAN, ILN, ISBN13, NVE

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $ean = CheckDigits('ean');

	 if ($ean->is_valid('7622200004607')) {
	       # do something
	 }

	 $cn = $ean->complete('762220000460');
	 # $cn = '7622200004607'

	 $cd = $ean->checkdigit('7622200004607');
	 # $cd = '7'

	 $bn = $ean->basenumber('7622200004607');
	 # $bn = '762220000460'

DESCRIPTION

   ALGORITHM
       1.  Beginning right all numbers are weighted alternatively 1 and 3 (that is the check digit is weighted 1).

       2.  The sum of all products is computed.

       3.  The sum of step 3 ist taken modulo 10.

       4.  The check digit is the difference between 10 and the number from step 3.

       To validate the total of the digits of all numbers inclusive check digit taken modulo 10 must be 0.

   METHODS
       is_valid($number)
	   Returns true only if $number consists solely of digits, spaces and hyphen 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, spaces and hyphen.

       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.

BUGS AND LIMITATIONS

       When invoked as "CheckDigits('isbn13')" the module checks whether the first three digits (the country code) are 978 or 979, the current (as
       of 2006) EAN country codes for books. If at any time other EAN country codes for ISBN-13 will be specified and the then responsible
       maintainer ignores this in the code, please send a friendly email.

AUTHOR

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

SEE ALSO

       perl, CheckDigits, www.pruefziffernberechnung.de.

perl v5.10.0							    2008-05-17						 CheckDigits::M10_004(3pm)

Check Out this Related Man Page

CheckDigits::M23_002(3pm)				User Contributed Perl Documentation				 CheckDigits::M23_002(3pm)

NAME

       CheckDigits::M23_002 - compute check digits for VAT Registration Number (IE)

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $dni = CheckDigits('ustid_ie');

	 if ($dni->is_valid('8473625E')) {
	       # do something
	 }

	 $cn = $dni->complete('8473625');
	 # $cn = '8473625E'

	 $cd = $dni->checkdigit('8473625E');
	 # $cd = 'E'

	 $bn = $dni->basenumber('8473625E');
	 # $bn = '8473625'

DESCRIPTION

   ALGORITHM
       1.  Beginning right all digits are weighted with their position in the number (i.e. the number left from the check digit is multiplied with
	   2, the next with 3 and so on).

       2.  All products are added.

       3.  The check digit is the sum from step 2 modulo 23. This number is expressed as the corresponding letter from the alphabet where A-V
	   correspond to 1-22 and W stands for check digit 0.

   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.

perl v5.10.0							    2008-05-17						 CheckDigits::M23_002(3pm)
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