• prime_number_314159@lemmy.world
      cake
      link
      fedilink
      arrow-up
      1
      ·
      18 days ago

      You can just bitwise AND those with …000000001 (for however many bits are in your number). If the result is 0, then the number is even, and if it’s 1, then the number is odd. This works for negative numbers because it discards the negative signing bit.