CheckDigits::M10_003 - compute check digits for ISMN
use Algorithm::CheckDigits; $ismn = CheckDigits('ismn'); if ($ismn->is_valid('M-345-24680-5')) { # do something } $cn = $ismn->complete('M-345-24680'); # $cn = 'M-345-24680-5' $cd = $ismn->checkdigit('M-345-24680-5'); # $cd = '5' $bn = $ismn->basenumber('M-345-24680-5'); # $bn = 'M-345-24680'
The 'M' as the first number gets the value 3. Beginning left all numbers are weighted alternatively 3 and 1.
The sum of all products is computed.
The sum of step 3 ist taken modulo 10.
The check digit is the difference between 10 and the number from step 3 taken 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>
perl, CheckDigits, www.pruefziffernberechnung.de.
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.