Algorithm::CheckDigits::M11_015(3)

NAME
CheckDigits::M11_015 - compute check digits for ESR5 (CH)

SYNOPSIS
  use Algorithm::CheckDigits;

  $ustid = CheckDigits('esr5_ch');

  if ($ustid->is_valid('050001000012000 241170032660178 10304')) {
        # do something
  }

  $cn = $ustid->complete('0001000012000 241170032660178 10304');
  # $cn = '050001000012000 241170032660178 10304'

  $cd = $ustid->checkdigit('0001000012000 241170032660178 10304');
  # $cd = '05'

  $bn = $ustid->basenumber('050001000012000 241170032660178 10304');
  # $bn = '0001000012000 241170032660178 10304';

DESCRIPTION

  ALGORITHM

1.  Beginning right all digits are weighted with the repeating sequence 2, 3, 4, 5, 6, 7.

2.  The weighted digits are added.

3.  The sum from step 2 is taken modulo 11.

4.  The checkdigit is 11 minus the sum from step 3. If the difference is 11, the checkdigit is 00.

  METHODS

is_valid($number)
    Returns true only if $number consists solely of numbers (with or without space between them) and the first two digits are valid check digits according to the algorithm given above.

    Returns false otherwise,

complete($number)
    The check digit for $number is computed and inserted before the $number.

    Returns the complete number with check digit or '' if $number does not consist solely of digits, spaces.

basenumber($number)
    Returns the basenumber of $number if $number has a valid check digit.

    Return '' otherwise.

checkdigit($number)
    Returns the check digits of $number if $number has valid check digits.

    Return '' otherwise.

  EXPORT
None by default.

AUTHOR
Mathias Weidner, "<mamawe@cpan.org>"

SEE ALSO
perl, CheckDigits, http://www.pruefziffernberechnung.de/E/Einzahlungsschein-CH.shtml (german), http://www.sic.ch/de/dl_tkicch_dta.pdf, page 52 (german)