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From "J.Pietschmann" <j3322...@yahoo.de>
Subject Re: [math] Math.pow usage was: Re: cvs commit: ...
Date Thu, 19 Jun 2003 19:03:56 GMT
Mark R. Diggory wrote:
>>> J.Pietschmann wrote:
>>>
>>>> No. If you cast the base into a double there is not much risk of
>>>> overflow: double x = n;  y=x*x; or y=((double)n)*((double)n);
>>>> or even y=n*(double)n; (but avoid y=(double)n*n).
>>>> Double mantissa has IIRC 52 bits, this should be good for integers
>>>> up to 2^26=67108864 without loss of precision.
> 
> Is this correct, I've been reading (again, if I'm getting this 
> correctly) the doubles mantissa is capable of supporting 15 -17 decimal 
> places, 2^26 is only 8.

I meant: you can square integers up to 2^26 without loss of precision
(due to truncation).

J.Pietschmann



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