NAME

       CheckDigits::M43_001 - compute check digits for Code-39

SYNOPSIS

         use Algorithm::CheckDigits;

         $c39 = CheckDigits('code_39');

         if ($c39->is_valid('AB-123K')) {
               # do something
         }

         $cn = $c39->complete('AB-123');
         # $cn = 'AB-123K'

         $cd = $c39->checkdigit('AB-123K');
         # $cd = 'K'

         $bn = $c39->basenumber('AB-123K');
         # $bn = 'AB-123'

DESCRIPTION

   ALGORITHM
       1.  After replacing all non numeric letters with their respective values, the sum of all
           numbers is computers

       2.  The checkdigit is the sum from step 1 taken modulo 43.

   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, <mathias@weidner.in-bad-schmiedeberg.de>

SEE ALSO

       perl, CheckDigits, www.pruefziffernberechnung.de.