Bytecraft doesn't recognize the type defs - double or float, but thank you
for the advice

-----Original Message-----
From: Kevin Blain [mailto:kevinb@WOODANDDOUGLAS.CO.UK]
Sent: Friday, February 22, 2002 10:13 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:MPLAB floating point in C


That's why then

Do somehing like Percent = (double) A / (double) B

Cast K&R page 45

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@mitvma.mit.edu] On Behalf Of Rich Mcelroy
> Sent: 22 February 2002 16:30
> To: PICLIST@mitvma.mit.edu
> Subject: Re: [PIC]:MPLAB floating point in C
>
>
> A is a signed long, and B is an unsigned long.  two large values.
>
> -----Original Message-----
> From: Peter Onion [mailto:ponion@SRD.BT.CO.UK]
> Sent: Friday, February 22, 2002 10:04 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:MPLAB floating point in C
>
>
> On 22-Feb-02 Rich Mcelroy wrote:
> > 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.
>
> What are the types of A & B please ?
>
> If they are integers, then the result of the division will be
> an integer.
>
> I would try
>
> (100.0 * A) / B
>
> That should "promote" the result to be a floating point type.
>  See Page 44 of the Second edition of K&R.
>
> Peter.
>
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