Re: Ada decimal types

[Keith Thompson <kst-u@mib.org>]

"REH" <me@you.com> writes:
> "Randy Brukardt" <randy@rrsoftware.com> wrote in message 
> news:8KadnYXCB-5FKMLZnZ2dneKdnZydnZ2d@megapath.net...
>>
>> "REH" <me@you.com> wrote in message
>> news:yj47g.23728$ZQ3.20636@twister.nyroc.rr.com...
>> ...
>> Also, duration is a binary fixed point.
>>> A don't want to use those because precision may be lost.  Whether or not
>> the
>>> loss will be an issue, I do not know but I would rather not risk it.  Of
>>> course I just may be worrying over nothing.
>>
>> You're still very confused. Semantically, there is no difference between
>>
>>    type Mission_Time_Type is delta 1.0e-6 range 0.0 .. (2.0**32) - 1.0;
>>    for Mission_Time_Type'Small use 1.0e-6;
>>
>> and
>>
>>    type Mission_Time_Type is delta 1.0e-6 digits 14;
>>
>
> Why is there not a difference?  Won't the first actually use some negative 
> power-of-2 as the delta?

Um, no.  The delta is exactly what's specified in the type declaration.
Given:
    type Mission_Time_Type is delta 1.0e-6 range 0.0 .. (2.0**32) - 1.0;
the delta is 1.0e-6.

In the absence of a representation clause for 'Small, the default
Small is a power of 2, but in this case the Small was explicitly
specified:
    for Mission_Time_Type'Small use 1.0e-6;
so the Small is also exactly 1.0e-6.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
San Diego Supercomputer Center             <*>  <http://users.sdsc.edu/~kst>
We must do something.  This is something.  Therefore, we must do this.