[G4] 2+2=4.0000001?

[Paul Moortgat]

Pcalc has no roundoff error.  Take 29 degrees, ask sin, cos, tan, 
tan-1, cos-1 and sin-1 and you get 29 degrees back.  Do this will all 
the calculators you know, even the HP hardware calculators.  You get 
something else as result.

Paul Moortgat

On 27-feb-04, at 04:18, CJ Scaminaci wrote:

> 	This is a roundoff error from the FPU. In a calculator (in 10.2 and 
> 10.3 at least), they use the floating point unit for all calculations. 
> Floating point calculations aren't known (at least from a programming 
> point of view) for being accurate in all cases ;).
>
> 	In this instance, they used a floating point calculation when a 
> simple integer operation would have worked. The FPU rounds numbers, 
> even whole numbers sometimes, unnecessarily. This causes errors, as 
> seen in this instance.
>
> 	Also, this is very hard to reproduce, because of how the FPU works. 
> Normally it would know better than to round a whole number. Here, that 
> wasn't the case. Just a simple mistake on the part of the FPU.
>
> --CJ
>
>
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