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Manual Reference Pages  -  ALGORITHM::CHECKDIGITS::M09_001 (3)

.ds Aq ’

NAME

CheckDigits::M09_001 - compute check digits for Euro notes

CONTENTS

SYNOPSIS



  use Algorithm::CheckDigits;

  $euro = CheckDigits(euronote);

  if ($euro->is_valid(X07738250357)) {
        # do something
  }

  $cn = $euro->complete(X0773825035);     # $cn = X07738250357

  $cd = $euro->checkdigit(X07738250357); # $cd = 7

  $bn = $euro->basenumber(X07738250357); # $bn = X0773825035



DESCRIPTION

    ALGORITHM

1. Letters are replaced with their position in the alphabet (’A’ = 1, ...).
2. The total of the digits of all numbers is computed.
3. This sum is taken modulo 9.
4. The check digit is the difference between 8 and the number of step 3.
To validate the last digit of the total of the digits of all numbers inclusive check digit must be 8.

    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.

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.
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perl v5.20.3 ALGORITHM::CHECKDIGITS::M09_001 (3) 2016-03-17

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