And just as I typed that, Kimi made one where 9 and 10, and 11 and 12 overlapped.

So far, I’d give qwen the prize for most artistic impression of a clock.

Kimi K2 appears to consistently get it right.

Weird, it should be standard C++20. Hope are you invoking gcc?

godbolt link: https://godbolt.org/z/6Tn4Kcjrs

Edit: be sure to call g++, not gcc.

#include <cmath>
#include <iostream>
#include <numbers>

int main()
{
  decltype ( NAN ) f { std::numbers::pi };
  std::cout << f << std::endl;
}