sub round {
  my $n = shift;
  int($n + .5 * ($n < 0 ? -1 : 1));
}

##</code><code>##

sub round {
  my ($n, $p) = @_;
  $p ||= 0;  # default to integer rounding
  int($n * 10**$p + .5 * ($n < 0 ? -1 : 1)) / 10**$p;
}