Another update from ingydotnet^djgoku

Task/Gray-code/Elixir/gray-code.elixir

@@ -0,0 +1,15 @@
+defmodule Gray_code do
+  use Bitwise
+  def encode(n), do: bxor(n, bsr(n,1))
+
+  def decode(g), do: decode(g,0)
+
+  def decode(0,n), do: n
+  def decode(g,n), do: decode(bsr(g,1), bxor(g,n))
+end
+
+Enum.each(0..31, fn(n) ->
+  g = Gray_code.encode(n)
+  d = Gray_code.decode(g)
+  :io.fwrite("~2B : ~5.2.0B : ~5.2.0B : ~5.2.0B : ~2B~n", [n, n, g, d, d])
+end)