CheckDigits::MBase_001 - compute check digits for UPC (US)
use Algorithm::CheckDigits; $rv = CheckDigits('upc'); if ($rv->is_valid('012345678905')) { # do something } $cn = $rv->complete('01234567890'); # $cn = '012345678905' $cd = $rv->checkdigit('012345678905'); # $cd = '5' $bn = $rv->basenumber('012345678905'); # $bn = '01234567890'
Add all digits in odd-numbered positions.
Multiply the sum from step 1 with 3.
Add all digits in even-numbered positions.
Add the product from step 2 and the sum from step 3.
If the sum from step 4 is 0 modulo 10, the check digit is 0. Else the check digit is 10 minus the sum from step 4 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>
Aaron W. West pointed me to a fault in the computing of the check digit.
perl, CheckDigits, www.pruefziffernberechnung.de, www.export911.com/e911/coding/upcChar.htm, www.adams1.com/pub/russadam/upccode.html, http://www.upcdatabase.com.
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.