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From: grover@dawkins.cs.unlv.edu (Kevin Grover)
Newsgroups: comp.lang.c
Subject: Re: Question: Representing complex numbers in C
Message-ID: <1991Mar1.202437.4400@unlv.edu>
Date: 1 Mar 91 20:24:37 GMT
References: <12620.27cbe36f@ecs.umass.edu>
Sender: news@unlv.edu (News User)
Reply-To: grover@dawkins.cs.unlv.edu (Kevin Grover)
Organization: UNLV Computer Science and Electrical Engineering
Lines: 49

In article <12620.27cbe36f@ecs.umass.edu>, lim@ecs.umass.edu writes:
) I'd appreciated it if anyone out there can help me out with this problem. It 
) concerns representation of complex numbers in C. I understand that Fortran has 
) a data type COMPLEX that allows complex variables to be treated like any int, 
) float, or double. I need to do the following in C:
) 
) COMPLEX x, y, z;
) z = x + y;
) etc.
) 
) The following won't work, obviously...
) 
) struct
) {
)  double real;
)  double imaginary;
) }
) COMPLEX;
) 
) Thanks in advance.
) 
) 
) Jonathan Lim

Well, as you've seen from the other messages, there is no easy way to do this 
in C.  However,  I ran into this problem also while trying to do some Numerical
Analysis homework.  Rather than using FORTrash, I wrote a complex number library
for C.  Even though C++ makes this library obsolete, I still have it.  If there
is some interest I could send it out.  I am not very familar with the practices
of sending code out on the net.  Where should I put the code?  On NEWS or an
FTP site?  It is many C files and some batch files to compile them into a 
library (for the various memory models.)

It supports quite a few functions:  log, sin, cos, tan, sinh, cosh, tanh
				    add, sub, mul, log, exp, (and more)

Some of the routines will also take multiple arguments.

I sort of assumed the someone else would have already written something like this
since it is not very difficult, but I didn'y have time to look and ask around.

Let me know if anyone would like this code, and tell me where and how to post it.
(it is written for Turbo C 2.0, but should work on any compiler.)

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