Re: Fixed-point question

[Anh Vo <anhvofrcaus@gmail.com>]

On Friday, June 26, 2015 at 11:22:00 AM UTC-7, Patrick Noffke wrote:
> On Friday, June 26, 2015 at 11:56:44 AM UTC-5, Jeffrey R. Carter wrote:
> > On 06/26/2015 06:20 AM, Patrick Noffke wrote:
> > > 
> > >    type Fixed_Type is delta 1.0 / 180.0 range 0.0 .. 65535.0 / 180.0;
> > 
> > What is Fixed_Type'Small?
> 
> It is 1/180.
> 
> > 
> > >    C1 : constant Fixed_Type := Fixed_Type (N / D);
> > 
> > What is C1'Size?
> > 
> > If you really want to use multiples of 1/180, you probably want to do
> > 
> > Delta_And_Small : constant := 1.0 / 180.0;
> > 
> > type Fixed_Type is delta Delta_And_Small range 0.0 .. 65535.0 * Delta_And_Small;
> > for Fixed_Type'Small use Delta_And_Small;
> > 
> 
> I do that in my application.  I just did the above for a simple test case.  Doing as you suggest does not change the result on either platform.
> 

It is time for a bug report. In fact, it occurs in other platforms as well. In addition, GNAT-GPL-2014 and GNAT Pro exhibit the same behavior.

Anh Vo