I recently stumbled upon this screenshot while researching social media on the train. Of course, it was followed by a cascade of spiteful comments, criticizing this fresh programmer’s attempt to solve a classical problem in computer science. The modulus operation.
This is why every programmer needs to understand the modulo operator.
Or bitwise AND.
This is what I prefer too! I also some times prefer to use bitshift when it comes to division or multiplication of power of 2.
I would divide by two (floating point) and check the fractional part.
turns out that 2^53 + 1 is an even number