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Forced rounding create precision troubles
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Good morning, Dear GeoGebra and GeoGebrians.
Forced rounding create precision troubles when need to exact draw values with periodic digits for: segments, squares, areas, etc.
According to Pythagoras Theorem, we should sum areas of two squares something like that.
It should be 0.999..., if 2/9 + 7/9 = 0.222... + 0.777... = 0.999...
See attached picture for details, there we could see that area is equal one instead of 0.999....
Thank You.
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square_area_0.9...
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calculate with 32/64 bit in decimal is alway an approximation.
Usual is with rounding and in the most applications this is more exact (see attachment).
If you want cut instead of round for your division you can use
floor(n / 9 (10¹⁵)) / 10¹⁵
.
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