Man pages sections > man3 > Algorithm::CheckDigits::M23_001

# CheckDigits::M23_001 - compute check digits for DNI (ES)

 CheckDigits::M23_001(3pm) User Contributed Perl Documentation CheckDigits::M23_001(3pm)

## NAME

CheckDigits::M23_001 - compute check digits for DNI (ES)

## SYNOPSIS

```  use Algorithm::CheckDigits;
\$dni = CheckDigits('dni_es');
if (\$dni->is_valid('54362315K')) {
# do something
}
\$cn = \$dni->complete('54362315');
# \$cn = '54362315K'
\$cd = \$dni->checkdigit('54362315K');
# \$cd = 'K'
\$bn = \$dni->basenumber('54362315K');
# \$bn = '54362315'
```

## DESCRIPTION

### ALGORITHM

1.
The checkdigit is the whole number taken modulo 23 and coded according to a keytable.

### 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.