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Re: Manipulating data from a file

by tobyink (Abbot)
on Dec 06, 2012 at 09:01 UTC ( #1007502=note: print w/replies, xml ) Need Help??

in reply to Manipulating data from a file

The maths part isn't especially tricky...

use 5.010; use strict; use warnings; # This expression is used to test if a string consists of a single # digit. We use it a couple of different places, so we'll just define # it once as a constant. # use constant DIGIT => qr/^[0-9]$/; # Let's assume you already have the date in an all numeric format. # say digit_sum('01-06-1980'); # This is the function which adds digits # sub digit_sum { my $string = shift; # First, split into digits. my @digits = grep { $_ =~ DIGIT } # keep only the numeric characters split '', $string; # split into characters # Add the digits together. my $sum = 0; $sum += $_ for @digits; # Handle the trivial case. # If $sum is just a single digit, return it as-is. return $sum if $sum =~ DIGIT; # Otherwise, recurse. return digit_sum($sum); }
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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