Are A and B integers? If so the reason you are getting zero is because the
compiler is doing integer math. You have to use "casting". Try doing it this
way instead: ((float)A)/B * 100.0. While this doesn't look like it is any
different from what you are doing it most certainly is. The (float) tells
the compiler to treat A as a float (even though it is an integer) and the
compiler converts the A to a float. Then it sees the division, since A is a
float the division must be done with two floats, so the compiter converts B
to a float as well, and then does the division, with the result being a
float. The 100.0 isn't really necessary but it does give a hint to what you
are doing if someone else is reading your code. Please note that I don't
have that compiler, I'm simply speaking about standard ANSI C, I'm sure that
compiler has these features. TTYL

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Rich Mcelroy
> Sent: Friday, February 22, 2002 10:48
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:MPLAB floating point in C
>
>
> I'm using Bytecraft's compiler for MPLAB.  it does basic math, but the
> results I'm getting indicate that it is droping anything after the integer
> on my calculations.  I'm trying to calculate a percentage:
>
> Percent = A/B * 100;  something like that.  I have been getting a zero for
> percent everytime.
>
> -----Original Message-----
> From: Dale Botkin [mailto:dale@BOTKIN.ORG]
> Sent: Friday, February 22, 2002 9:22 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:MPLAB floating point in C
>
>
> What are you trying to do?  Float <--> integer conversion is just a matter
> of casting, and I haven't seen a C compiler recently that didn't support
> basic operations (+,-,/,*).  Standard C math functions will do a lot...
> are you using a compiler without floating point support?
>
> 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
>
>
> On Fri, 22 Feb 2002, Rich Mcelroy wrote:
>
> > Does anyone have math libraries for using floating point variables in c.
> I
> > am working on a PIC and I have seen microchip's AN575.  That
> would be very
> > useful if the application I was working with was in asm.  I have looked
> all
> > over for help on doing this in c.  Maybe someone here can help.  Thanks
>
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