On Tue, Jan 20, 2004 at 06:16:09PM -0500, Swaminathan Venkatakrishnaprasad wrote:
> Hello,
Hi.
> Could you please let me know if it is valid to declare an automatic
> variable inside a for loop.
What is an "automatic" variable? I never heard of such a thing. Can
you elaborate?!
> If yes, is it also allowed in ANSI standard (could you please refer
> me to the sec #).
However, I'd say that your code is valid ANSI C, though I don't have
the sec # at hand.
> GCC Version : 2.95.3
> Example:
> void f()
> {
> int i;
> i = 10;
> while(i >=0 )
> {
> int j;
> i=j;
> printf("j=%d \n", j);
> i--;
> }
> return;
> }
>
> Also, in the above example would the number of iterations contribute
> anything to the stack size since an automatic variable is declared
> inside the while loop??
You declare a *single* variable on the stack inside the while loop
named `j'. Which is not initialized by the way and that's why it's
undefined whether the loop terminates or not -- either it terminates
after a single iteration (j happens to be <= 0) or else it runs ad
nauseam.
Since you declare a *single* variable which is accessible inside the
scope of the while loop, the number of iterations has no impact on the
stack size.
HTH
--
Claudio Bley ASCII ribbon campaign (")
Debian GNU/Linux user - against HTML email X
http://www.cs.uni-magdeburg.de/~bley/ & vCards / \
