 CheckDigits::M10_011(3) 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'

## ALGORITHM

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

None by default.

## AUTHOR

Mathias Weidner, <[email protected]>