From: Owen Gunden <ogunden@stwing.upenn.edu>
To: caml-list@inria.fr
Subject: Re: [Caml-list] variant type
Date: Tue, 17 Jun 2003 14:15:39 -0400 [thread overview]
Message-ID: <20030617181538.GA23197@force.stwing.upenn.edu> (raw)
In-Reply-To: <3EEF57F7.7020705@cs.stevens-tech.edu>
On Tue, Jun 17, 2003 at 02:03:35PM -0400, Ye Wu wrote:
> Could you please tell me why the following doesn't work?
Sure.
> type shape = Square of int * int * int
> |Circle of float * float * float;;
> let area s =
> match s with
> Square (_, _, d) -> d * d
> |Circle (_, _, r) -> 3.14 *. r *. r;;
It's because the area function is not well-typed. If the area function is
operating on a Square it wants to return an int; if it's operating on a
Circle it wants to return a float. It can only return one type.
Owen
-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
next prev parent reply other threads:[~2003-06-17 18:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-17 18:03 Ye Wu
2003-06-17 18:15 ` Owen Gunden [this message]
2003-06-18 8:12 ` Alex Romadinoff
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20030617181538.GA23197@force.stwing.upenn.edu \
--to=ogunden@stwing.upenn.edu \
--cc=caml-list@inria.fr \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox