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NAN error and debugging with GDB

If I pass a negative number as argument to sqrt() it returns a NAN as
expected. Is there any way to debug this problem using GDB
Let me know
Co
Nov 14 '05
10 7126
Keith Thompson <ks***@mib.or g> wrote in message news:<ln******* *****@nuthaus.m ib.org>...
ai***@acay.com. au (Peter Nilsson) writes:
Eric Sosman <Er*********@su n.com> wrote in message
news:<3F******* ********@sun.co m>...

<snip>

#include <math.h>
...
double my_sqrt(double, const char*, int);
#undef sqrt /* in case <math.h> defines it as a macro */
#define sqrt(x) my_sqrt((x), __FILE__, __LINE__)

^^^
Why parenthesise x here?


<snip> ... it's much easier to add the parentheses than to prove that they're
unnecessary in this particular case.


In this particular case, I think it's much easier to leave them out:

#define sqrt(x) my_sqrt(x, __FILE__, __LINE__)

As Dan Pop once said, "[it] isn't unclear *at all* and only an expert
could actually have doubts about it". ;)

--
Peter
Nov 14 '05 #11

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