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From: "Vinzent Hoefler" <nntp-2010-10@t-domaingrabbing.de>
Newsgroups: comp.lang.ada
Subject: Re: evaluation of named numbers
Date: Sun, 17 Oct 2010 17:28:58 +0200
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Date: 2010-10-17T17:28:58+02:00
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On Sun, 17 Oct 2010 17:01:25 +0200, Rolf <rolf.ebert_nospam_@gmx.net> wrote:

> I always thought that named numbers are fully evaluated with (almost)
> unlimited precision at compile time. I was quite astonished to see
>
>   Ticks : constant := 20 / 1000 * 16_000_000 / 8; -- 40_000 ticks
>
> evaluated to 0 and not to the expected 40.000. It seems that the
> compiler uses integer numbers also for intermediate results and 20 /
> 1000 ends up to be 0 instead of 0.02.

Well, after all it's an integer expression. I wouldn't expect a real
result when doing that - not even as an intermediate result.

> Any decent pocket calculator gets that right.

Because it uses real numbers.

> Are expressions for named numbers always evaluated left to right?

According to ARM 4.5(8), yes.


Vinzent.

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