• NAME
• SYNOPSIS
• ALGORITHM
• METHODS
• EXPORT
• AUTHOR
• SEE ALSO

NAME

CheckDigits::M10_008 - compute check digits for Sedol (GB)

SYNOPSIS

  use CheckDigits;

  $sedol = CheckDigits('sedol');

  if ($sedol->is_valid('0123457')) {
        # do something
  }

  $cn = $sedol->complete('012345');
  # $cn = '0123457'

  $cd = $sedol->checkdigit('0123457');
  # $cd = '7'

  $bn = $sedol->basenumber('0123457');
  # $bn = '012345'

=head1 DESCRIPTION

ALGORITHM

1. Beginning left all numbers are weighted with 1,3,1,7,3,9 and 1 (checkdigit)

2. The sum of all products is computed.

3. The check digit is the difference of the sum from step 3 to the next multiple of 10.

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

the perl manpage, the CheckDigits manpage, www.pruefziffernberechnung.de.