From: att!cbnews!cbnewsl!willett@ucbvax.Berkeley.EDU (david.c.willett)
Subject: Re: Ada statement
Date: 14 Jan 92 20:49:28 GMT [thread overview]
Message-ID: <1992Jan14.204928.21571@cbnewsl.cb.att.com> (raw)
>From article <1992Jan14.031331.18320@cs.rose-hulman.edu>, by eigenstr@zoe.cs.r
ose-hulman.edu (Todd R. Eigenschink):
> about this then. And now...the $64,000 question....
>
> Why the HELL is there the NULL statement?????????????
>
> There's only one use as far as I can tell...to fill an empty procedure/
> function declaration so that the body isn't empty. So why not just allow
> an empty body?
I don't know the "official" answer to your question, but I would like to
offer two possibilities.
You can use the NULL statement as one alternative of a conditonal
accept, or as an alternative in a conditonal. In both cases, it
would be analogous to the FORTRAN or C "continue".
Ada is very strict about a programmer being explicit. If you want
to do something (or nothing) you must say so. Having a NULL statement
to tell the world that you are not doing anything is consistent with
this philosophy.
Good luck with the class,
Dave
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