• @fartripper@lemmy.ml
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    5 months ago

    or divide the number by two and if the remainder is greater than

    -(4^34)
    

    but less than

    70 - (((23*3*4)/2)/2)
    

    then

    true
    
      • Then you should return false, unless the remainder is also greater than or equal to the twenty second root of 4194304. Note, that I’ve only checked up to 4194304 to make sure this works, so if you need bigger numbers, you’ll have to validate on your own.

          • 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.