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From: Colin Paul Gloster <Colin_Paul_Gloster@ACM.org>
Newsgroups: comp.lang.ada
Subject: Re: Simulation of fixed point in c WITH DIFFERENT BIT-WIDTH
Date: Wed, 2 Nov 2005 10:42:49 +0000 (UTC)
Organization: News UmU SE
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References: <1130690498.388857.225170@g49g2000cwa.googlegroups.com>
 <1130690498.388857.225170@g49g2000cwa.googlegroups.com>
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Date: 2005-11-02T10:42:49+00:00
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Mnamky did not say in 
news:1130690498.388857.225170@g49g2000cwa.googlegroups.com that the 
datatypes could take negative values, but anyway Gautier's
type F1 is delta 2.0**(-11) range -1.0 .. 1.0;
is a wasteful declaration which is bigger than Mnamky's "12-bit 
wordlength and 11-bit fraction".
A two's complement signed 1 bit integer can have as its lowest value -1 
and as its greatest value 0.
So
type F3 is delta 2.0**(-11) range -1.0 .. 1.0 - 2.0**(-11);
type F4 is delta 2.0**(-14) range -2.0 .. 2.0 - 2.0**(-14);
are more appropiate datatypes.