Size of Int on a machine

[aruna]

How do I check the size of int on a machine before
runtime, at the pre-processor stage? Is it possible?

[Eric Sosman]

aruna wrote:

How do I check the size of int on a machine before
runtime, at the pre-processor stage? Is it possible?

Not in Standard C, although some implementations allow
it as a non-conforming extension. What you *can* do, though,
is check the range of an int, using the INT_MAX and INT_MIN
macros defined in <limits.h>. For example,

#include <limits.h>
#if INT_MAX >= 1000000
typedef int Million;
#else
typedef long Million;
#endif

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Er*********@sun.com

[Kip Neuhart]

"aruna" <ar********@yahoo.co.in> wrote in message
news:a2**************************@posting.google.c om...

How do I check the size of int on a machine before
runtime, at the pre-processor stage? Is it possible?

You can't do it directly in standard C. Perhaps this is a sign that your
code relies on machine specifics too much?

[CBFalconer]

aruna wrote:

How do I check the size of int on a machine before
runtime, at the pre-processor stage? Is it possible?

#include <limits.h>

#if (INT_MAX < nnnL)
# error "int too small"
#endif

It might be simpler to use longs for the appropriate variables.

--
Chuck F (cb********@yahoo.com) (cb********@worldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net> USE worldnet address!

[Dan Pop]

In <a2**************************@posting.google.com > ar********@yahoo.co.in (aruna) writes:

How do I check the size of int on a machine before
runtime, at the pre-processor stage? Is it possible?

Yup. Include <limits.h> and examine INT_MAX.

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de

[Vijay Kumar R Zanvar]

"aruna" <ar********@yahoo.co.in> wrote in message news:a2**************************@posting.google.c om...

How do I check the size of int on a machine before
runtime, at the pre-processor stage? Is it possible?

A simple method would to consult the documentation,
if any, that came with the compiler.

--
Vijay Kumar R Zanvar
Movies - http://www.geocities.com/vijoeyz/misc/movies.html