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Date: Wed, 02 Nov 2005 21:43:14 +0100
From: Gautier Write-only <gautier@fakeaddress.nil>
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Subject: Re: Simulation of fixed point in c WITH DIFFERENT BIT-WIDTH
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Date: 2005-11-02T21:43:14+01:00
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Colin Paul Gloster wrote:
> 
> 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.

Thank you for this precision.
Being sure that my approximation was quite rough, I had put the "something like" verbal precaution :-)
G.