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From: Lutz Donnerhacke <lutz@iks-jena.de>
Newsgroups: comp.lang.ada
Subject: Re: += in ada
Date: Tue, 21 Oct 2003 12:45:51 +0000 (UTC)
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* Russ wrote:
> "Robert I. Eachus" <rieachus@comcast.net> wrote in message news:<3F937806.9080205@comcast.net>...
>> in a nutshell.  Chad even gave a perfect riposte, to the question of 
>> side effects. The statement x += y += 1; is perfectly legal C, and I'll 
>> let Russ choose what is the effect, and what is the side effect.
>
> I'll tell you exactly what the effect is: a compile error.

You should learn even C before ranting any further.
$ cat >t.c
#include <stdio.h>
#include <stdlib.h>

int main(void) {
   int a = 1, b = 2;

   printf("a = %d\nb = %d\n", a, b);
   printf("Result: %d\n", a += b += 1);
   printf("a = %d\nb = %d\n", a, b);

   return EXIT_SUCCESS;
}
$ make t
cc     t.c   -o t
$ ./t
a = 1
b = 2
Result: 4
a = 4
b = 3
$ _

> And I must say that I am a bit surprised that this is not obvious to you.

Your attitude does not match you knowledge. That's not funny.

> "+=" would be a procedure, and my understanding of procedures in Ada is
> that they do *not* return a value.

Yep. But we talked about C in this paragraph.

> Am I missing something here?

Yes: The language context.