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From: sl323 AT city DOT ac DOT uk (Mark Lewis)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: header file <math.h>
Date: 7 Dec 1995 14:18:43 GMT
Organization: School of Informatics, City University, London
Lines: 45
References: <DJ11BI DOT 2xy AT jade DOT mv DOT net>
Reply-To: M DOT Lewis AT city DOT ac DOT uk
Nntp-Posting-Host: paddington.city.ac.uk
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

You need to link the math library to your executable to use math functions.
Use the -lm flag at the END of your compile command line.

--
..--------------------------{ From:  Mark Lewis }--------------------------.
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THutchi141 AT aol DOT com wrote:
> Hi,

> I am a new user of djgpp.  I have downloaded several zip files and have
> successfully
> compiled several simple C programs.  However, I have not been able to use the
> include
> file <math.h>.  A simple program, such as:

> #include <stdio.h>
> #include <math.h>

> main()
> {
>      printf("%d\n",sin(3.0));
> }

> produces an error:

> "ex2-2.c (.text + 0x24): undefined reference sin"

> during compilation.  If I use another math function in place of sin, I get
> the same error (
> except with "sin" in the error statement replaced by the appropriate
> function).
> I have searched through the file math.h and have found that it has a
> statement:
> #include <math-68881.h>
> in it.  However, upon looking through all of my files associated with djgpp,
> I am unable
> to find math-68881.h.  Could there be a *.zip file that I may need to
> install?  Any 
> suggestions would be helpful.  Thanks.

> Todd Hutchinson