Newsgroups:	comp.os.msdos.djgpp
From:	Peter Berdeklis <peter AT atmosp DOT physics DOT utoronto DOT ca>
Subject:	Re: complex in c (!c++)
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Date:	Tue, 4 Mar 1997 20:24:46 GMT
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On Sun, 2 Mar 1997, Eli Zaretskii wrote:
> On Sat, 1 Mar 1997, Gurunandan R. Bhat wrote:
> > gives a wrong zz. i would be grateful if users of __complex__ in c could 
> > share their experience on this. would it correct to conclude that while 
> > simple algebraic manipulations are implemented, math functions are not? 
>
> I think the problem is that the library doesn't support complex data type. 
> The algebraic operations are implemented by calling functions from
> libgcc.a, therefore they work.  You will have to explicitly write the
> complex math functions in terms of the real and imaginary parts, to get
> full support for complex computations. 

I missed the original article so I don't know exactly which functions 
Gurunandan is asking about.  However, the class complex is part of the 
C++ Draft Standard and it includes templated complex math functions like 
pow, log, sqrt, and the trig and hyperbolic trig functions.  These are 
implemented in gcc 2.7.2.  If they give the wrong answer then there is a 
bug, but since all the functions are templates the bug should be easy to 
trace and correct since all the code is in a header file.

---------------
Peter Berdeklis
Dept. of Physics, Univ. of Toronto

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