Re: [Tinycc-devel] Strange sizeof construct

[Chris Lattner]

On Nov 13, 2007, at 3:39 PM, grischka wrote:

> > Could a C guru out there please tell me why the following works?
> > Extra points if you can explain why it makes sense.
> >
> > #include <stdio.h>
> >
> > int main(){
> > int arr[10];
> > printf("%d\n",sizeof arr[0]);  // ok
> > printf("%d\n",sizeof(arr[0])); // ok
> > printf("%d\n",sizeof(arr)[0]); // ok, but why?
> > return 0;
> > }
>
> And what about that one:
>
>     printf("%d\n",sizeof (0)[arr]);

Why wouldn't this work?  These all seem to be explicitly allowed by  
the C99 grammar.

-Chris