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From: "Jeffrey Creem" <jeff@thecreems.com>
Newsgroups: comp.lang.ada
References: <3F3CCB0F.543478AF@adrianhoe.nospam.com.my>
Subject: Re: float with 24-bit resolution
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<mailbox@adrianhoe.nospam.com.my> wrote in message
news:3F3CCB0F.543478AF@adrianhoe.nospam.com.my...
> Hi,
>
> I looked through the LRM and searched CLA but I could not find any
> solution. Perhaps I've overlook somewhere.
>
> I need a float with 24-bit resolution. My data needs to be encoded into
> 24 bits at a scaling of 720 degrees / 2^24 bits with the most
> significant bit being the sign bit. This results in a value that ranges
> from +359.9999571 degrees (0x7FFFFF) to -360.0000000 degrees (0x800000)
> at increments of approximately 4.291534424e-5 degrees per bit.

This does not sound anything like a float at all. It sounds much more like a
typical implementation of a fixed point type. Something along the lines of

package My_Pack is

The_Delta : constant := 4.291534424e-5;

  type Probably_Gonna_Work_But_Language_Lawyers_Will_Complain_Type is delta
The_Delta range - 360.0 .. 359.9999571;
  for  Probably_Gonna_Work_But_Language_Lawyers_Will_Complain_Type'Small use
The_Delta;
  for Probably_Gonna_Work_But_Language_Lawyers_Will_Complain_Type'Size use
24;


end My_Pack;

There are all sorts of things you can get bitten by here...especially with
the 24 bit requirement but when looking for

a specific representation the details can be tricky.



What are you really trying to achieve at a higher level (e.g. talking to
some hardware, sending some message to a device, etc?)