Correct me if i´m wrong.
Using 32bit long as fixed point (Q31) I could reach a range from -1 to
0,9999999995 (=1-2^-31), wich seems to satisfy the specification.
Bye,
Ricardo
----- Original Message -----
From: "Bill Knight" <bi...@rosw.com>
To: <mspgcc-users@lists.sourceforge.net>
Sent: Wednesday, February 12, 2003 10:32 AM
Subject: Re: [Mspgcc-users] Double data type?
> This got me thinking (warning). Looks like values can range from
> 0.00000000 to 99999999. What about using 'long long's? I think
> that should cover the range. Would someone remind me, does mspgcc
> have long long support?
>
> Anyway, just a thought.
>
> -Bill Knight
> R O SoftWare
>
>
> On Wed, 12 Feb 2003 08:16:15 -0500 (EST), Thomas Carley wrote:
>
> >Would a fixed point representation work well here? If you use base 2
> >(binary fixed point) it is very efficient. What is the range of data you
> >need to represent, and with what precision?
>
> >On Wed, 12 Feb 2003, Dmitry wrote:
>
> >> 64bits doubles are not supported.
> >> I have no plans to make this support.
> >>
> >> only 32bits IEEE754 floats are (somehow) suported.
> >>
> >> ~d
> >>
> >>
> >> On Wednesday 12 February 2003 00:17, Mark Stokes wrote:
> >> > What happened to the double data type that was discussed earlier. I
> >> > have found a need for it and was wondering. Here's my dilemma:
> >> > I am using 8-digit 7-seg display to represent things on the screen.
> >> > This means that if I want to represent a floating point number that
is
> >> > less than one like 0.9999999 I would have a number that is out of the
> >> > bounds of the "float" data type. For example:
> >> >
> >> > float floatvar;
> >> >
> >> > floatvar = 0.99999999
> >> >
> >> > Then floatvar ends up == 1 which is not helping me. I need it to ==
> >> > .99999999 because internally the controller can't deal w/ numbers (in
> >> > this particular variable) that are >= 1.0.
> >> > However, if I take the same code and put on Borland, and use
"double's",
> >> > then I get the intended result (floatvar ends up == to 0.99999999).
> >> > {footnote: if I use float in Borland the same thing happens.}
> >> >
> >> > Any ideas on when "double" will be available? What about a new
release
> >> > of the win32 executables? Perhaps I'll get the gnu tree working so
that
> >> > I can make win32 releases, but right now I don't have the time to
mess
> >> > w/ that.
> >> >
> >> > Thanks
> >> > -Mark
> >> >
> >> >
> >> >
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