Underscore Pi (2017) | Hacker News Reader

Underscore Pi (2017)

codeexplainer.wordpress.com

85 pointsPortableCode9 comments

In all its glory:

   #define _ -F<00||--F-OO--;
   int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO()
   {
               _-_-_-_
          _-_-_-_-_-_-_-_-_
       _-_-_-_-_-_-_-_-_-_-_-_
     _-_-_-_-_-_-_-_-_-_-_-_-_-_
    _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
    _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
   _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
   _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
   _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
   _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
    _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
    _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
     _-_-_-_-_-_-_-_-_-_-_-_-_-_
       _-_-_-_-_-_-_-_-_-_-_-_
           _-_-_-_-_-_-_-_
               _-_-_-_
   }

Fierce! Unhinged! Cromulent! Kickass!

Unfortunately, this doesn't seem to work in Clang because it doesn't support the -traditional-cpp flag. Make sure that you're actually using GCC if you're following along!

> What would happen if you make the circle in the code bigger?

More precision?

links to sources on ioccc.org: http://ioccc.org/1988/westley.c | http://ioccc.org/1988/westley.hint

We changed the title from "Underscore Pi – when M_PI from math.h is too mainstream; IOCCC winning entry".

This is a fine HN submission, but please don't rewrite titles to editorialize!

https://news.ycombinator.com/newsguidelines.html

Could you maybe add something about it being an IOCCC winner back in? (I generally read the comments first to decide if I want to read the article, and I wasn't going to bother reading this until I saw it had something to do with the IOCCC)

M_PI is not part of the C standard (it is part of Posix) so the title is awkward.

I agree it's awkward, but not because of M_PI being non-standard. If history had lead to pi being defined in standard C, this code would still have been interesting. The title is awkward because it talks more about M_PI than about the content of the article.

I agree that the code is interesting. It was specifically the HN title I was talking about, which is not even the title of the original article. Sorry if I wasn't clear. Anyway, it's been updated now.

Reply on news.ycombinator.com