Fun surprising things

[Nick Sabalausky (Abscissa)]

On 10/31/18 10:00 AM, bauss wrote:
> What's the output of this program? (Try to figure it out without running 
> it.)
> 
> ```
> int c = 0;
> 
> int a()
> {
>      return c++;
> }
> 
> int b()
> {
>      return c--;
> }

I'm not sure I understand the point here. I mean, who writes code like 
that? Pre/Post-incement operators? Combined with globals? To me that 
just smells of trouble.

So if the issue is that the above code should result in an error but 
currently doesn't, then...honestly, I'm totally onboard with that, 
because it definitely strikes me as bad code. But I'm unclear about the 
details. What *exact* part of it should be the error? To me, that's the 
part that's not obvious. Intuitively, it strikes me as as bad code, but 
to me, it's not obvious what *specifically* the compiler should be 
objecting to. So, at least for me, spelling this out in more detail 
would really help.