NAME

CheckDigits::M43_001 - compute check digits for Code-39

SYNOPSIS

  use Algorithm::CheckDigits;

  $c39 = CheckDigits('code_39');

  if ($c39->is_valid('AB-123K')) {
	# do something
  }

  $cn = $c39->complete('AB-123');
  # $cn = 'AB-123K'

  $cd = $c39->checkdigit('AB-123K');
  # $cd = 'K'

  $bn = $c39->basenumber('AB-123K');
  # $bn = 'AB-123'
  

DESCRIPTION

ALGORITHM

1. After replacing all non numeric letters with their respective values, the sum of all numbers is computers

2. The checkdigit is the sum from step 1 taken modulo 43.

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, www.pruefziffernberechnung.de.