NAME

       CheckDigits::M10_006 - compute check digits for Rentenversicherung (DE)

SYNOPSIS

         use Algorithm::CheckDigits;

         $rv = CheckDigits('rentenversicherung');

         if ($rv->is_valid('65180539W001')) {
               # do something
         }

         $cn = $rv->complete('65180539W00');
         # $cn = '65180539W001'

         $cd = $rv->checkdigit('65180539W001');
         # $cd = '1'

         $bn = $rv->basenumber('65180539W001');
         # $bn = '65180539W00'

DESCRIPTION

   ALGORITHM
       1.  The letter is replaced with a two-figure number appropriate to the position of the
           letter in the german alphabet.

       2.  Beginning left all numbers are weighted with 2,1,2,5,7,1,2,1,2,1,2,1.

       3.  The the total of the digits of all products is computed.

       4.  The check digit is sum from step 3 taken modulo 10.

   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.