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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.



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