Convert binary to int

bin_to_int.lua

--a binary number is represented as values in a table
t_bin = {1,0,0,0,0,0,0,0}

function bin_to_in(x)
  r=0
  for k,v in pairs(x) do
    r = r + (v*2^(8-k))
  end
  return math.floor(r)
end