table of contents
| Algorithm::CheckDigits::M11_017(3pm) | User Contributed Perl Documentation | Algorithm::CheckDigits::M11_017(3pm) |
NAME¶
CheckDigits::M11_017 - compute check digits for EC-No, EINECS, ELINCS
SYNOPSIS¶
use Algorithm::CheckDigits;
$ecno = CheckDigits('ecno');
if ($ecno->is_valid('200-236-6')) {
# do something
}
$cn = $ecno->complete('200-236-');
# $cn = '200-236-6'
$cd = $ecno->checkdigit('200-236-6');
# $cd = '6'
$bn = $ecno->basenumber('200-236-6');
# $bn = '200-236-'
DESCRIPTION¶
ALGORITHM¶
- 1.
- From left to right all digits are multiplied with their position in the sequence.
- 2.
- The sum of all products is computed.
- 3.
- The sum of step 2 is taken modulo 11.
The checkdigit is the last digit of the result.
METHODS¶
- is_valid($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>"
SEE ALSO¶
perl, CheckDigits, http://en.wikipedia.org/wiki/EC-No.
| 2021-11-17 | perl v5.40.0 |