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Algorithm::CheckDigitsUser0Contributed Perl Algorithm::CheckDigits::M10_004(3)

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,	"<mamawe@cpan.org>"

SEE ALSO
       perl, CheckDigits, www.pruefziffernberechnung.de.

perl v5.32.1			  2021-08-27Algorithm::CheckDigits::M10_004(3)

NAME | SYNOPSIS | DESCRIPTION | BUGS AND LIMITATIONS | AUTHOR | SEE ALSO

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