| Algorithm::CheckDigits::MXX_002(3pm) | User Contributed Perl Documentation | Algorithm::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, "<mamawe@cpan.org>"
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
| 2021-11-17 | perl v5.40.0 |