CheckDigits::M11_017 - compute check digits for EC-No, EINECS, ELINCS
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-'
From left to right all digits are multiplied with their position in the sequence.
The sum of all products is computed.
The sum of step 2 is taken modulo 11.
The checkdigit is the last digit of the result.
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>
perl, CheckDigits, http://en.wikipedia.org/wiki/EC-No.
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.