Re: i know is off of topic, but...

[Russell Shaw <rjshaw netspace net au>]

Mario Motta wrote:
> hi all,
> someone can tell me why this piece of sw compile and works even if it 
> should not ?
>
> $ gcc --version
> gcc (GCC) 3.3.1 (mingw special 20030804-1)
> $ gcc impossible.c -o impossible
>
> ======================================================
> #include <stdio.h>
>
> int main(int argc, char *argv[])
>
> {
> int n,lv;
> printf("enter lv:");
> scanf("%d",&lv);
> int impossible[lv];  // declaring an array without a constant size ?

This is a C89 GNU extension and standard in C99.

> for(n = 0; n < lv; n++)
>   {
>     impossible[n] = n+10;
>     printf("\nimpossible[%d] = %d",n,impossble[n]);
>     fflush(stdout);
>   }
> return 0;
> }
>
> TIA
>
> /mario