my $bob = 123.456
print &my_format($bob) . "\n";

##</code><code>##

$bob = 123.4567;
print &print_fixed($bob). "\n";
exit 0;
sub print_fixed {
  my $num = shift;
  my $ipart = int($num);
  my $dpart = sprintf("%.3f",$num);
  my ($frac_part) = $dpart=~ /\.(\S*)/;
  return $ipart . $frac_part;
}