Algorithm::CheckDigits::M07_001(3)

NAME
CheckDigits::M07_001 - compute check digits modulo 7 method 1

SYNOPSIS
  use Algorithm::CheckDigits;

  $m001 = CheckDigits('m001');

  if ($m001->is_valid('1234567892')) {
        # do something
  }

  $cn = $m001->complete('123456789');    # $cn = '1234567892'

  $cd = $m001->checkdigit('1234567892'); # $cd = '2'

  $bn = $m001->basenumber('1234567892'); # $bn = '123456789'

DESCRIPTION

  ALGORITHM

1.  All digits are added.

2.  All digits at even positions are added.

3.  The sum of step 1 and 2 is taken modulo 7.

4.  This is the check digit.

  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 undef if $number does not consist solely of digits.

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

    Return undef otherwise.

checkdigit($number)
    Returns the check digit belonging to $number or undef if $number does not consist solely of digits.

  EXPORT
None by default.

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

SEE ALSO
perl, www.pruefziffernberechnung.de.