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From: bagpiper@mcosm.uucp
Newsgroups: comp.lang.c,comp.lang.ada
Subject: Re: Excerpts from "The C Programming Language" (Re: C bashing)
Message-ID: <233@mcosm.uucp>
Date: 24 May 90 20:58:15 GMT
References: <2426@psuhcx.psu.edu>
Distribution: comp
Organization: Microcosm, Inc.
List-Id: <comp.lang.ada>

I basically agree with Mr. Hannum...I just want to correct his misconception
that you can't do cast-like operations in Ada....you just can't do them
very efficiently!!  (no flames please, many Ada implementation don't handle
generics very well...)

In article <2426@psuhcx.psu.edu>, hannum@schubert.psu.edu (Charles Hannum) writes:
> To settle some of the flame wars from Ada, Lisp, and Pascal lovers against the
> C language, I quote some paragraphs from the introduction to "The C Programming
> Language" by Brian W. Kernighan and Dennis M. Ritchie below:
> 
[stuff deleted]
> of incompatible data types.  Nevertheless, C retains the basic philosophy that
> programmers know what they are doing; it only requires that they state their
> intentions explicitly."
> 
> Pay careful attention to that last sentence.  This is the basic philosophical
> difference between C and [Ada,Pascal,...].  C allows you to do funny type cast-
> ing, as long as you state it explicitly.  [Ada,Pascal,...] does not.  In the
> hands of an idiot, this is dangerous.  In the hands on an experienced and
> knowledgable programmer, this is a powerful tool.
You can do cast like operations in Ada.  Check out the predefined generic
UNCHECKED_CONVERSION.  There are also a few other places where Ada seems
to have lower level features then c.  Some of the representation attributes
are hard to copy in c.  Of course the other day I was trying to write
a minimal debugger in Ada and just about killed myself for some way to
represent a generic pointer (void *).  Oh well....
[more stuff deleted]
> Virtually,
> - Charles Martin Hannum II         PennMUD Design Team - (Resident) Programmer
>     (That's Charles to you!)       "Those who say a thing cannot be done should
>   Please send mail to:              under no circumstances stand in the way of
>   hannum@haydn.psu.edu              he who is doing it." - a misquote

					Later,
					  Michael

P.S. I am no receiving comp.lang.ada yet (I'm working on it), so if someone
in comp.lang.ada has something to say, please mail it.

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