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#!/usr/bin/env perl
use strict;
use warnings;
use feature qw{ say signatures state };
no warnings qw{ experimental };
use Scalar::Util qw{looks_like_number};
my @numbers = ( 1221, -101, 90, 2112, 9, 90.09 );
for my $num (@numbers) {
my $r = is_palindrome_number($num);
say qq{Input: $num};
say qq{Output: $r};
say '';
}
# this is specifically about numbers, so we'll use
# looks_like_number from Scalar::Util. Otherwise we'll
# assume base-10 and treat it like a decimal, which is
# how Perl likes to stringify numbers.
# returns 0 if not a number
# returns 0 if not a palindrome
# what remains should only be palindromic numbers,
# so returns 1
sub is_palindrome_number($num = 0) {
return 0 unless looks_like_number($num);
my $mun = join '', reverse split //, $num;
return 0 unless $mun eq $num;
return 1;
}
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