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RE: [Caml-list] function type confusion (using let)
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Date: -- (:)
From: FALCON Gilles FTRD/DTL/LAN <gilles.falcon@r...>
Subject: RE: [Caml-list] function type confusion (using let)


-----Message d'origine-----
De : Laurent Chéno [mailto:laurent.cheno@noos.fr]
Envoyé : lundi 3 septembre 2001 07:55
À : Michael Leary
Cc : Caml-list
Objet : Re: [Caml-list] function type confusion (using let)


(* please excuse my poor english *)

> I was trying to be clever about not using ;; and minimizing my use of ; 
> in
> files, and I've gone off the deep end...
>
> Why is this wrong, and how do I fix it?:
>
> let pi = 3.14159
> let pi2 = 2.0 *. pi
>
> let normr r =
>   let x = mod_float r pi2 in
>   if x > 0.0 then
>     if x > pi then
>       -.pi2 +. x
>     else
>       x
>   else if x < 0.0 then
                      ^ this "then" has no else !

>     if x < -.pi then  (* <------ here *)
>       pi2 +. x
>     else
>       x

... else ??

You have forgotten the "else" clause : if <cond> then <expr>   has 
type : unit
if <cond> then <float-expr> else <float-expr> has type : float
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