From: Shawn Wagner <shawnw@speakeasy.org>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] While loop
Date: Mon, 30 Aug 2010 15:57:22 -0700 [thread overview]
Message-ID: <20100830155722.4c6ed0b9@speakeasy.org> (raw)
In-Reply-To: <AANLkTimbYyvs64etwRB831q4g3aat5RD1_Rz1PjhGxXd@mail.gmail.com>
On Mon, 30 Aug 2010 15:43:40 -0700
Mike Chen <mickey.chuen@gmail.com> wrote:
> Hi,
>
> I am a caml rookie, and I need your help.
>
> (* pp is a very simple function *)
> # let pp list =
> let newList = ref [] in
> let i = ref 0 in
> let ele = ref (List.nth list !i) in
> while (!ele) != 5 do
> newList := List.append !newList [(!ele mod 3)];
> i := !i + 1;
> done;
> !newList;;
> val pp : int list -> int list = <fun>
>
> # pp [ 3; 4; 5];;
>
> (* it seems it goes into a forever loop, but I expect it returns [ 0;
> 1]. What is wrong? *)
>
You never update the value of ele, and so the only way the loop
conditional can ever be false is if the list you pass to the function
starts with a 5.
--
Shawn Wagner
shawnw@speakeasy.org
next prev parent reply other threads:[~2010-08-30 22:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-30 22:43 Mike Chen
2010-08-30 22:53 ` TeXitoi
2010-08-30 22:57 ` Shawn Wagner [this message]
2010-08-30 23:25 ` [Caml-list] " Grant Olson
2010-08-30 23:49 ` TeXitoi
2010-08-31 0:17 ` [Caml-list] " Grant Olson
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