# ex_08-3
# Learning Perl on Win32 Systems, Exercise 8.3

sub card {
  my %card_map;
  @card_map{0..9} = qw(
		       zero one two three four five six seven eight nine
		      );
  
  my($num) = @_;
  my($negative);
  if ($num < 0) {
    $negative = "negative ";
    $num = - $num;
  }
  if ($card_map{$num}) {
    $negative . $card_map{$num}; # return value
  } else {
    $negative . $num; # return value
  }
}