3 ms·

15 + 15 gives 14 14 - 15 gives 15

• mcintyre1994 10y ago
  The way I wrote this was rubbish, edited. I was trying to get at if you have 1110, 1111 then 1110 + 1111 will overflow, but you could xor them.
  • jonsen 10y ago
    1110 + 1111 = 1101 1101 - 1110 = 1111 1101 - 1111 = 1110 Overflow doesn't matter if you just want to swap.
    • Sacho 10y ago
      (Assuming two's complement arithmetic, as amelius pointed out - I don't know if all programming languages and platforms use it)
    • mcintyre1994 10y ago
      That's a really smart observation I hadn't made, thanks for explaining!