Which programming style do you like? Which one should I use? (Now, disregard the fact that this sub may not actually work properly. :P But I just want to talk about the style here.)

Here are five examples:

# Style 1: "The Beginner"

##########################################
# Returns the pathname separator character
# which depends on the type of OS.
#
#  Usage: STRING = GetPathnameSeparator()
#
sub GetPathnameSeparator
{
  my $S = uc($^O);
  return ':' if (index($S, 'MACOS') >= 0);
  return '\\' if (index($S, 'WIN') >= 0);
  return '/'; # LINUX OR OTHER
}

# Style 2: "Neat"

##########################################
# Returns the pathname separator character
# which depends on the type of OS.
#
#  Usage: STRING = GetPathnameSeparator()
#
sub GetPathnameSeparator
{
  my $S = uc( $^O );

  if (index($S, 'MACOS') >= 0) { return ':'; }
  if (index($S, 'WIN') >= 0)   { return '\\'; }
  return '/'; # LINUX OR OTHER
}

# Style 3: "The one-liner"

$SEPARATOR = index(uc($^O),'MAC')>=0?':':index(uc($^O),'WIN')>=0?'\\':
+'/';

# Style 3: "somewhat condensed"

# Returns the pathname separator character which depends on the type o
+f OS.
sub GetPathnameSeparator
{
  my$Y=uc($^O);
  index($Y,'MAC')<0||return':';
  index($Y,'WIN')<0||return'\\';
  return'/'; # DEFAULT=LINUX
}

# Style 4: "black-hole density"

sub GetPathnameSeparator{my$Y=uc($^O);return index($Y,'MAC')>=0?':':in
+dex($Y,'WIN')>=0?'\\':'/';}

# Style 5: "somewhat misleading/obfuscated"

sub iii{$a=uc($^O);return(index($a,'MAC')>=0?':':index($a,'WIN')>=0?'\
+\':'/');}
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