Algorithm::CheckDigits::M11_017.3pm

Langue: en

Autres versions - même langue

Version: 2008-05-17 (debian - 07/07/09)

Section: 3 (Bibliothèques de fonctions)

NAME

CheckDigits::M11_017 - compute check digits for EC-No, EINECS, ELINCS

SYNOPSIS

   use Algorithm::CheckDigits;
 
   $ecno = CheckDigits('ecno');
 
   if ($ecno->is_valid('200-236-6')) {
         # do something
   }
 
   $cn = $ecno->complete('200-236-');
   # $cn = '200-236-6'
 
   $cd = $ecno->checkdigit('200-236-6');
   # $cd = '6'
 
   $bn = $ecno->basenumber('200-236-6');
   # $bn = '200-236-'
 
 

DESCRIPTION

ALGORITHM

1.
From left to right all digits are multiplied with their position in the sequence.
2.
The sum of all products is computed.
3.
The sum of step 2 is taken modulo 11.

The checkdigit is the last digit of the result.

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, <mathias@weidner.in-bad-schmiedeberg.de>

SEE ALSO

perl, CheckDigits, http://en.wikipedia.org/wiki/EC-No.