Algorithm::CheckDigits::M10_010(3)

NAME
CheckDigits::M10_010 - compute check digits for Postscheckkonti (CH)

SYNOPSIS
  use Algorithm::CheckDigits;

  $pck = CheckDigits('postcheckkonti');

  if ($pck->is_valid('85-12345678-7')) {
        # do something
  }

  $cn = $pck->complete('85-12345678');
  # $cn = '85-12345678-7'

  $cd = $pck->checkdigit('85-12345678-7');
  # $cd = '7'

  $bn = $pck->basenumber('85-12345678-7');
  # $bn = '85-12345678'

DESCRIPTION

  ALGORITHM

1.  The sequence of digits is processed left to right. For the first digit we assume a carry forward of 0.

2.  For each digit d(i) the carry forward cf(i) is the digit at the the position p in the sequence ( 0, 9, 4, 6, 8, 2, 7, 1, 3, 5 ), where p is (d(i) + cf(i-1)) modulo 10.

3.  The check digit is the difference of the sum from step 3 to the next multiple of 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, "<mamawe@cpan.org>"

SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de.