Identifier collisions between global level and static identifiers

[Anupam]

Hi,

#include <stdio.h>
#include <stdlib.h>
int var;
int main(void)
{
static int var;
/* Does this name have a separate existence as compared to the global var? */
return EXIT_SUCCESS;
}

What does the standard say about this situation? Is this legal?

Regards and thanks,
Anupam

[Richard Bos]

an**************@persistent.co.in (Anupam) wrote:

#include <stdio.h>
#include <stdlib.h>
int var;
int main(void)
{
static int var;
/* Does this name have a separate existence as compared to the global var? */
Yes. Within main(), var refers to the static local object. Outside
main(), var refers to the filescope object.
return EXIT_SUCCESS;
}

What does the standard say about this situation? Is this legal?

Yes.

Richard

[Leor Zolman]

On 6 Feb 2004 04:56:10 -0800, an**************@persistent.co.in
(Anupam) wrote:

Hi,

#include <stdio.h>
#include <stdlib.h>
int var;
int main(void)
{
static int var;
/* Does this name have a separate existence as compared to the global var? */
return EXIT_SUCCESS;
}

What does the standard say about this situation? Is this legal?
static or no static, simple scoping rules control visibility.

Here's an expansion of your example:

#include <stdio.h>
#include <stdlib.h>
int var = 50;
int main(void)
{
{
printf("value of var is %d\n", var); // 50

static int var = 1000; // hides file scope version
printf("value of var is %d\n", var); // 100
}
printf("value of var is %d\n", var); // 50

return EXIT_SUCCESS;
}

This would be an offensive thing to do in real code, but illustrates
the scoping rules... (requires C99 or C++ to compile, though)
-leor

Regards and thanks,
Anupam

Leor Zolman
BD Software
le**@bdsoft.com
www.bdsoft.com -- On-Site Training in C/C++, Java, Perl & Unix
C++ users: Download BD Software's free STL Error Message
Decryptor at www.bdsoft.com/tools/stlfilt.html

[CBFalconer]

Anupam wrote:

#include <stdio.h>
#include <stdlib.h>
int var;
int main(void)
{
static int var;
/* Does this name have a separate existence as compared to the global var? */ return EXIT_SUCCESS;
}

What does the standard say about this situation? Is this legal?

Yes, function scope, yes respectively.

--
Chuck F (cb********@yahoo.com) (cb********@worldnet.att.net)
Available for consulting/temporary embedded and systems.
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