Algorithm::CheckDigits::MXX_002 man page on Pidora

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CheckDigits::MXX_002(3User Contributed Perl DocumentatiCheckDigits::MXX_002(3)

NAME
       CheckDigits::MXX_002 - compute check digits for CAS

SYNOPSIS
	 use Algorithm::CheckDigits;

	 $cas = CheckDigits('cas');

	 if ($cas->is_valid('1333-74-0')) {
	       # do something
	 }

	 $cn = $cas->complete('1333-74-');
	 # $cn = '1333-74-0'

	 $cd = $cas->checkdigit('1333-74-0');
	 # $cd = '0'

	 $bn = $cas->basenumber('1333-74-0');
	 # $bn = '1333-74-'

DESCRIPTION
   ALGORITHM
       1.  Beginning right with the second digit all digits are weighted
	   ascending starting with 1.

       2.  The sum of those products is computed.

       3.  The checksum is the last digit of the sum from step 2 (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>

THANKS
       Aaron W. West pointed me to a fault in the computing of the check
       digit.

       HERMIER Christophe made me aware that CAS is now assigning 10-digit CAS
       Registry Numbers (http://www.cas.org/newsevents/10digitrn.html)

SEE ALSO
       perl, CheckDigits, www.pruefziffernberechnung.de, www.cas.org
       http://www.cas.org/expertise/cascontent/registry/checkdig.html

perl v5.14.1			  2009-11-20	       CheckDigits::MXX_002(3)
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