Re: small example, using complex variables in Ada

["J-P. Rosen" <rosen@adalog.fr>]

Yannick Duchï¿œne (Hibou57) a ï¿œcrit :
>>> It would be good to state the theoretically correct answer; I hope it's
>>> 1.5, not 1.499... :).
>> Note that they are mathematically equal (with an inifinite number of 9s)
> I'm not using so called Reals, so I am not at ease with details in this
> area: is it specified by the Ada standard or by the IEEE standard ? (I
> know Ada follows IEEE standard, while may be Ada adds some extra stuff
> there)
For output, rounding is specified in the standard. And BTW, the standard
does not specify IEEE (fortunately, it did not make the same mistake as
Java!). It just makes sure that it is not incompatible with IEEE
arithmetic, and does provide some facilities for handling signed zeroes,
which are present in IEEE, but maybe also provided by other models.

> Humor: where did you ever see an infinite sequence in a computer ?
> (except in a never-ending loop)
> 
I said "mathematically", because of the "..." that followed the last
'9'. But for computers, anybody doing some number crunching should know
that computations are not exact, and that 1.49* should be considered the
same as 1.5

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           J-P. Rosen (rosen@adalog.fr)
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