From:	Martin Ambuhl <mambuhl AT earthlink DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Forgive me, for I have sinned without including math.h
Date:	Thu, 24 Jun 1999 12:52:45 -0400
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"Andrew R. Gillett" wrote:
> 
> I just found a strange anomaly. I had two identical functions in
> different programs using sin(). Each program gave significantly different
> results. I eventually found that one of them wasn't including math.h.
> Adding it fixed the problem.
> 
> I found that if I called sin() without #including math.h, the compiler
> would think it returned a fix instead of a double. I found this out when
> I was doing some tests with fprintf and sin - the compiler told me that a
> fix couldn't be passed through a ...

There is no anomaly.  When you use a function without a declaration (either a
prototype, in this case from <math.h>, or definition), it is assumed to returned
int.  This has always been true in C, although it may soon start to be an error
instead.


-- 
Martin Ambuhl (mambuhl AT earthlink DOT net)

Ah! but it is something to have at least the 
choice of nightmares.  - Joseph Conrad

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