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Manual Reference Pages  -  ALGORITHM::CHECKDIGITS::M07_001 (3)

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NAME

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

CONTENTS

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.
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perl v5.20.3 ALGORITHM::CHECKDIGITS::M07_001 (3) 2016-03-17

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