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

#### NAME

```       CheckDigits::MXX_001 - compute check digits for PA (DE)

```

#### SYNOPSIS

```         use Algorithm::CheckDigits;

\$pa = CheckDigits('pa_de');

if (\$pa->is_valid('2406055684D<<6810203<0705109<6')) {
# do something
}

\$cn = \$pa->complete('240605568_D<<681020_<070510_<_');
# \$cn = '2406055684D<<6810203<0705109<6'

\$cd = \$pa->checkdigit('2406055684D<<6810203<0705109<6');
# \$cd = '6'

\$bn = \$pa->basenumber('2406055684D<<6810203<0705109<6');
# \$bn = '240605568_D<<681020_<070510_<_'

```

#### DESCRIPTION

```   ALGORITHM
1.  Beginning left all digits are weighted with 7,3,1,7,3,1,...

2.  The sum of those products is computed.

3.  The checksum is the last digit of the sum from step 2 (modulo 10).

4.  Step 1 to 3 is performed for every part of the number and for all 3 parts including
the particular checkdigit to compute the total checksum.

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>

```

#### THANKS

```       Aaron W. West pointed me to a fault in the computing of the check digit.

```

#### SEEALSO

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