Re: Funny loop with post-increment.

Don't forget that this is a POST-increment. The return value of i++ is the
original value of i, before it was incremented.

-Chris

-----Original Message-----
From: Discussion of development on the .NET platform using any managed
language [mailto:[email protected]] On Behalf Of Frans Bouma
Sent: Tuesday, February 19, 2008 12:15 AM
To: [email protected]
Subject: Re: [DOTNET-CLR] Funny loop with post-increment.

> Brady Kelly wrote:
> > Why does this loop not exit?  On the first iteration, one would expect i
==
> > 0, and that 0 to be assigned to i, and then i incremented.  Then, on the
> > second iteration, i should be 1 before the assignment operation, as well
as
> > after the assignment operation, but i should be two after the
> > post-increment, before the next assignment.
> >
> >
> >             int i = 0;
> >             while (i < 10)
> >             {
> >                 i = i++;
> >             }
>
> i=i++ is effectively this:
>
> int tmp = i;
> i = i + 1;
> tmp = i;
>
> In other words, the increment happens after the evaluation of i, but
> before the assignment - so the assignment just sets it back to the
> original value.

        I don't find this obvious. Right-hand side of the assignment should
be
evaluated first, so:
i=i+1
i=i

        I don't see how /why a temp variable is suddenly created.

                FB

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com