question about GCC

[Matt Salganik]

Hello,

I was writing some code in C to perform numerical calculations and in my 
program I tried to use round().  The program compiled but the round() 
function produced extremely strange results.  I looked at the man page and 
this offered me no hint as to why round() would act so strangely.

Later I asked a more experienced colleague.  After about one hour of 
investigation he explained to me that round() is not actually declared in 
<math.h> even though looking at the man page one might think it is.  He 
also explained that this has something to do with the C99 standard 
(something I have never heard of).  The problem was that the compiler 
assumed round() would return an int, but it actually returned a 
float.  This caused lots of problems.

In any case, I was writing to tell you about this problem, which you may 
already know about, and to suggest that either you declare round() in 
<math.h> or explain the situation more fully in the man page.

Thanks for all your work in developing and maintaining GCC.  I use it all 
the time.

Matt


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Matt Salganik
http://www.people.cornell.edu/pages/mjs99