I have several questions in mind, like:

1. Is +, -, *, / Actually O(1)? It’s common said that these operations are O(1), but is that always true?

2. Is x % y Slower Than x-(x / y) * y? I’ve heard people say "modulo is slow", so why not just avoid % and use x-(x / y) * y instead?

I hope you understand my curiosity!