Re: Weird result for modulus operation

[Robert Dewar <dewar at adacore dot com>]

Ang Way Chuang wrote:
> Andrew Pinski wrote:
> > On Tue, Apr 29, 2008 at 8:50 PM, Ang Way Chuang <wcang@nav6.org> wrote:
> >
> > >         abc.a = abc.a++ % abc.b;
> > You are assigning to abc.a twice without a sequence point inbetween so
> > this code is undefined as the order of evaluation of expressions
> > without a sequence point is unspecified.
> Thanks for the speedy reply. But why this code:
>
> 	int a = 17, b = 16;
> 	a = a++ % 16;
>
> results in a = 2 then? I think I need to know what is sequence point. 
> I'll google that.

undefined means undefined, you can't expect two
similar undefined constructs to have anaologous
behavior!
> > Thanks,
> > Andrew Pinski