Provided by: libalgorithm-checkdigits-perl_0.50-1_all

#### NAME

```       CheckDigits::M89_001 - compute check digits for VAT Registration Number (LU)

```

#### SYNOPSIS

```         use Algorithm::CheckDigits;

\$ustid = CheckDigits('ustid_lu');

if (\$ustid->is_valid('13669580')) {
# do something
}

\$cn = \$ustid->complete('136695');
# \$cn = '13669580'

\$cd = \$ustid->checkdigit('13669580');
# \$cd = '80'

\$bn = \$ustid->basenumber('13669580');
# \$bn = '136695'

```

#### DESCRIPTION

```   ALGORITHM
1.  The checksum is the whole number taken modulo 89.

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>

```

#### SEEALSO

```       perl, CheckDigits, www.pruefziffernberechnung.de.
```