Man pages sections > man3 > Algorithm::CheckDigits::M10_010

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

 CheckDigits::M10_010(3pm) User Contributed Perl Documentation CheckDigits::M10_010(3pm)

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.

None by default.