##
for (++$x .. $x++ . $x) { ... }
# starting at ++$x
# ending at $x++ . $x
# THE END HAS MODIFIED THE START
##
##
print ++$x, ++$x, ++$x; # 333
##
##
$x = 3;
print ++$x/$x--; # 3/4 => 0.75
##
##
for (++$x .. $x++ . $x--) { ... }
# or
for (++$....$.++.$.--) { ... }