NAME

CheckDigits::M10_011 - compute check digits UPS (US)

SYNOPSIS

  use Algorithm::CheckDigits;

  $ups = CheckDigits('ups');

  if ($ups->is_valid('1Z 591580 68 55587736')) {
	# do something
  }

  $cn = $ups->complete('1Z 591580 68 5558773');
  # $cn = '1Z 591580 68 55587736'

  $cd = $ups->checkdigit('1Z 591580 68 55587736');
  # $cd = '6'

  $bn = $ups->basenumber('1Z 591580 68 55587736');
  # $bn = '1Z 591580 68 5558773'
  

DESCRIPTION

ALGORITHM

1. Beginning left all numbers are weighted alternatively 1 and 2.

2. The sum of all products is computed.

3. The sum of step 3 ist taken modulo 10.

4. The check digit is the difference between 10 and the number from step 3.

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, <mamawe@cpan.org>

SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de.