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

#### NAME

```       CheckDigits::M10_010 - compute check digits for Postscheckkonti (CH)

```

#### SYNOPSIS

```         use Algorithm::CheckDigits;

\$pck = CheckDigits('postcheckkonti');

if (\$pck->is_valid('85-12345678-7')) {
# do something
}

\$cn = \$pck->complete('85-12345678');
# \$cn = '85-12345678-7'

\$cd = \$pck->checkdigit('85-12345678-7');
# \$cd = '7'

\$bn = \$pck->basenumber('85-12345678-7');
# \$bn = '85-12345678'

```

#### DESCRIPTION

```   ALGORITHM
1.  The sequence of digits is processed left to right. For the first digit we assume a
carry forward of 0.

2.  For each digit d(i) the carry forward cf(i) is the digit at the the position p in the
sequence ( 0, 9, 4, 6, 8, 2, 7, 1, 3, 5 ), where p is (d(i) + cf(i-1)) modulo 10.

3.  The check digit is the difference of the sum from step 3 to the next multiple of 10.

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.
```