On Oct 17, 12:30 am, jaysome <jays...@hotmail.com> wrote:
> On Tue, 16 Oct 2007 20:24:26 -0000, Justin Spahr-Summers
> <Justin.SpahrSumm...@gmail.com> wrote:
> >On Oct 16, 9:23 am, Kevin Walzer <k...@codebykevin.com> wrote:
> >> With C, such an approach doesn't seem practical. You need to identify
> >> some variables ahead of time just to have a program that will compile!
>
> >C99 (which is the latest standard) allows mixed declarations and code,
> >but is not widely implemented in full; however, in C90, you can also
> >do something like the following:
>
> >int myfunction (void) {
> > int a = 5;
> > /* do stuff with 'a' here */
> > {
> > int b = 6;
> > /* do stuff with 'a' and 'b' here */
> > }
>
> > /* do more stuff with 'a' here */
> > return a;
> >}
>
> >The scope of the variable 'b' begins at the inner opening brace and
> >ends at the inner closing brace, and as long as you keep its
> >declaration at the very beginning of that scope, it's legal in both
> >C90 and C99. Any amount of nested braces is allowed as well.
>
> If the scope of the variable 'b' begins at the inner opening brace,
> shouldn't I be allowed to do something like this?
>
> int myfunction (void) {
> int a = 5;
> /* do stuff with 'a' here */
> {
> int b0 = b;
> int b = 6;
> /* do stuff with 'a' and 'b' here */
> }
>
> /* do more stuff with 'a' here */
> return a;
>
> }
>
> When I do this, I get a compiler error:
>
> error C2065: 'b' : undeclared identifier
>
> What gives?

I was thinking in a hurry after a long day. It obviously begins where
the declaration is. I'm fairly certain you realize that, but the OP
might not, so thanks for bringing it up.