Just to point out, you can get floating point wrapped up in a chip:
http://www.al-williams.com/awce/pak1.htm.

Also, if you do use the Microchip routines, drop by our site and pick up
our Windows float/ieee/microchip float conversion program -- a free
download. http://www.al-williams.com/awce (look for Fconvert towards the
bottom).

Good luck!

Al Williams
AWC
* Easy RS-232 Prototyping
http://www.al-williams.com/awce/rs1.htm



> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Rich Mcelroy
> Sent: Friday, February 22, 2002 11:06 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:MPLAB floating point in C
>
>
> Dale,
>
> that would be great, and I actually tried to do that first,
> but Bytecraft doesn't recognize "float" as a type def.  Do
> you know of a compiler for MPLAB that does?
>
> Richard
>
> -----Original Message-----
> From: Dale Botkin [mailto:dale@BOTKIN.ORG]
> Sent: Friday, February 22, 2002 10:40 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:MPLAB floating point in C
>
>
> On Fri, 22 Feb 2002, Rich Mcelroy wrote:
>
> > A is a signed long, and B is an unsigned long.  two large values.
>
> That's probably the problem.  Dunno about Bytecraft, but the
> compiler probably isn't quite intiutive enough to know that
> you want to perform an operation with two longs and get a
> float result.  It's probably going to do a long mult, then
> try to map the result into a float variable...  the results
> aren't going to be pretty, I've found.
>
> Try this:
>
> float Percent;
> signed long A;
> unsigned long B;
>
> Percent = (float)A/(float)B;
> Percent *= 100;
>
> You may want to take a look at the resulting code size.  I
> find my compiler often generates much smaller, cleaner code
> with something like
> this:
>
> float Percent, fA, fB;
> signed long A;
> unsigned long B;
>
> fA = (float)A;
> fB = (float)B;
> Percent = fA/fB;
> Percent *= 100;
>
> Dale
> --
> "Curiosity is the very basis of education and if you tell me
> that curiosity killed the cat, I say only the cat died nobly."
>           - Arnold Edinborough
>
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