Lua学习笔记：分享一个用纯Lua写的位操作（异或）

前言

Lua在5.3���本之前没有进行位操作的运算符，如果想用一些位操作没有那么容易，可以使用BIt库来处理，这里分享几个使用纯Lua写的异或运算

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local floor = math.floorfunction 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 rend

function bin_xor(x, y)   local z = 0   for i = 0, 31 do      if (x % 2 == 0) then                      -- x had a '0' in bit i         if ( y % 2 == 1) then                  -- y had a '1' in bit i            y = y - 1             z = z + 2 ^ i                       -- set bit i of z to '1'          end      else                                      -- x had a '1' in bit i         x = x - 1         if (y % 2 == 0) then                  -- y had a '0' in bit i            z = z + 2 ^ i                       -- set bit i of z to '1'          else            y = y - 1          end      end      y = y / 2      x = x / 2   end   return zend

XOR_l ={    {0,1},   {1,0},}function xor(a,b)   pow = 1   c = 0   while a > 0 or b > 0 do      c = c + (XOR_l[(a % 2)+1][(b % 2)+1] * pow)      a = math.floor(a/2)      b = math.floor(b/2)      pow = pow * 2   end   return cend

都好使可以直接拿去用

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