if ($ARGV[0] != "") {
	$user_ip = $ARGV[0];
}elsif (($ARGV[0] =~ /\D/ ) || ($ARGV[0] eq "") ){
	 print "Enter odd number only: ";
	 $user_ip = <STDIN>;
}else{
	$user_ip = <STDIN>;
}

do{ #get mod value, if mod_off is 1 then entered number is odd otherwise ask user to enter the odd number
	$mod_off = find_mod_val($user_ip);
	if (($user_ip == "") || ($user_ip eq "") || ($user_ip eq "") || ($mod_off == 0)) {
		print "Enter odd number only: ";
		$user_ip = <STDIN>;
	}
}until($mod_off == 1);

print "Good odd number ${user_ip}";

__END__