1 << 1 =      2   0x2
  1 << 7 =    128   0x80
 -1 >> 1 =     -1   0xffffffff
512 >> 8 =      2   0x2
 13  & 6 =      4   0x4
 13  | 6 =     15   0xf
 13  ^ 6 =     11   0xb
  2  & 1 =      0     0
  2  | 1 =      3   0x3
  2  ^ 1 =      3   0x3