while ($i = 1) {

##</code><code>##

use strict;
use warnings;

my $c;

for (my ($valid, $try) = (0, 1); !$valid; ++$try)
{
    print "Enter the range of the array (try $try):\n";

    chomp($c = <STDIN>);

    if ($c =~ /^\d+$/)
    {
        print "You have entered a valid range: $c\n";
        $valid = 1;
    }
    elsif ($try < 3)
    {
        print "The input is invalid, please enter digits only\n";
    }
    else
    {
        print "No valid array range entered, exiting\n";
        exit;
    }
}

print "Continuing...\n";