CheckDigits::MXX_002 - compute check digits for CAS
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-'
Beginning right with the second digit all digits are weighted ascending starting with 1.
The sum of those products is computed.
The checksum is the last digit of the sum from step 2 (modulo 10).
Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.
$number
Returns false otherwise,
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.
Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
Returns the checkdigit of $number if $number has a valid check digit.
None by default.
Mathias Weidner, <mamawe@cpan.org>
<mamawe@cpan.org>
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)
perl, CheckDigits, www.pruefziffernberechnung.de, www.cas.org http://www.cas.org/expertise/cascontent/registry/checkdig.html
To install Algorithm::CheckDigits, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Algorithm::CheckDigits
CPAN shell
perl -MCPAN -e shell install Algorithm::CheckDigits
For more information on module installation, please visit the detailed CPAN module installation guide.