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

#### NAME

```       CheckDigits::M10_001 - compute check digits for Bahncard (DE), IMEI, IMEISV, ISIN,
Miles&More, Payback (DE), Personnummer (SE), Passport (BR), Credit Cards, SSN (US),
Samordningsnummer (SE), VAT RN (ES), VAT RN (IT), VAT RN (SE), International Securities
Identifikation Number (ISIN)

```

#### SYNOPSIS

```         use Algorithm::CheckDigits;

\$visa = CheckDigits('visa');

if (\$visa->is_valid('4111 1111 1111 1111')) {
# do something
}

\$cn = \$visa->complete('4111 1111 1111 111');
# \$cn = '4111 1111 1111 1111'

\$cd = \$visa->checkdigit('4111 1111 1111 1111');
# \$cd = '7'

\$bn = \$visa->basenumber('4111 1111 1111 1111');
# \$bn = '4111 1111 1111 111'

```

#### DESCRIPTION

```   ALGORITHM
1.  Beginning right all numbers are weighted alternatively 1 and 2 (that is the check
digit is weighted 1).

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.

To validate the total of the digits of all numbers inclusive check digit taken modulo 10
must be 0.

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.

For IMEI, IMEISV: ETSI Technical Specification TS 100 508 (v6.2.0)
```