[notfish]

In what languages is n % 2 -1 for negative odd numbers?

Edit: apparently JS, java, and C all do this. That’s horrifying

[jagged-chisel]

Horrifying? It’s mathematically correct.

[seritools]

it's a semantics problem, not a maths problem - modulus and remainder are not the same operation. This easily trips up people since `%` is often called "modulo", yet is implemented as remainder operation in many languages

https://stackoverflow.com/questions/13683563/whats-the-diffe...

[michael1999]

It's actually really awkward. Math usually considers (-7 mod 5) === (2 mod 5). But in C, (-7 % 5 != 2 % 5).

[affinepplan]

wrong. it's not any more correct than 1. that's the key part of an "equivalence" class is that the elements are "equivalent"