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CheckDigits::MXX_002(3pm) User Contributed Perl Documentation CheckDigits::MXX_002(3pm)
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 v5.10.0 2008-05-17 CheckDigits::MXX_002(3pm)
