How do I use the bitwise operator XOR in Lua?

Question

How can I implement bitwise operators in Lua language?
Specifically, I need a XOR operator/method.

Answer 1

From the OP; moved from question into this answer.

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This is how I implemented XOR in Lua:

local floor = math.floor
function bxor (a,b)
  local r = 0
  for i = 0, 31 do
    local x = a / 2 + b / 2
    if x ~= floor (x) then
      r = r + 2^i
    end
    a = floor (a / 2)
    b = floor (b / 2)
  end
  return r
end