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
#include 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