Initial data commit

Task/Gray-code/Lua/gray-code-1.lua

@@ -0,0 +1,18 @@
+local _M = {}
+
+local bit  = require('bit')
+local math = require('math')
+
+_M.encode = function(number)
+  return bit.bxor(number, bit.rshift(number, 1));
+end
+
+_M.decode = function(gray_code)
+  local value = 0
+  while gray_code > 0 do
+    gray_code, value = bit.rshift(gray_code, 1), bit.bxor(gray_code, value)
+  end
+  return value
+end
+
+return _M