How do I check the size of int on a machine before
runtime, at the pre-processor stage? Is it possible?
5  1320 
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
-- Er*********@sun .com
"aruna" <ar********@yah oo.co.in> wrote in message
news:a2******** *************** ***@posting.goo gle.com... 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?
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.
--
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Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net> USE worldnet address!
In <a2************ **************@ posting.google. com> ar********@yaho o.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
"aruna" <ar********@yah oo.co.in> wrote in message news:a2******** *************** ***@posting.goo gle.com... 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.
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