On a 32 bits architecture, ocaml' integers are signed 31 bits (one bit
is reserved for the GC). Therefore :

======================================================================
# 0xffff0000;;       
- : int = -65536
======================================================================

and that answers your question.

If you really need 32 bits integers, I've written a small 32 bits
integers library, which you can find here :

	 http://www.lri.fr/~filliatr/ftp/ocaml/int32/

You  can use  it freely,  and even  adapt it  to unsigned  integers if
necessary. Of course, there is a lack of performance compared to ocaml
integers.

Best regards,
-- 
Jean-Christophe FILLIATRE
  mailto:Jean-Christophe.Filliatre@lri.fr
  http://www.lri.fr/~filliatr


In his message of Thu August 26, 1999, Hugues CASSE writes: 
> Is there a bug or is there a way to get the correct result...
> 
> 	# 0xffff0000 lsr 16;;
> 	- : int = 32767
> while
> 	# 0x0000ffff;;
> 	- : int = 65535