[Haskell-cafe] Re: New slogan for haskell.org

[apfelmus]

Laurent Deniau wrote:
> apfelmus wrote:
>
> Back then, I was given the task to calculate some sequence
> of numbers which I did in one page of C code.
> 
> import Data.Set
> 
> xs = let f x m = x: let y = x `div` 2
>                     in f (if member y m then 3*x else y) (insert x m)
>      in f 1 (singleton 0)
> 
>> As said, it's two lines if the terminal is too small :)
> 
> I can't see how it could be one page of C unless the page is 10 lines 
> long ;-) The following code is the direct translation of your Haskell 
> code (except that it prints the result instead of building a list).
> 
> a+, ld.
> 
> #include <stdio.h>
> #include <intset.h>
> 
> void f(int x, intset s) {
>   printf("%d, ", x);
>   f (intset_elem(s, x/2) ? 3*x : x/2, intset_put(s, x));
> }
> 
> int main(void) {
>   f (1, intset_put(intset_new(), 0));
> }

Well, I only remember that it took _me_ a page of C code :D Basically 
due to a hand-coded intset and user interaction (no REPL for C, after all).


Regards,
apfelmus