float is wrong - Printable Version

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+--- Thread: float is wrong (/showthread.php?tid=628651)

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float is wrong - GoldenLion - 12.02.2017

Hi, when I set a float to 0.005 and print it, it says "0.004999". Is there any way to fix that? I need it to be exactly 0.005.

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Re: float is wrong - Jefff - 12.02.2017

try 0.005001

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Re: float is wrong - GoldenLion - 12.02.2017

If I set it to 0.005001 and print it then it's correct (0.005001). 0.5 is correct as well (0.500000). But 0.005 is 0.004999. What's up with it?

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Re: float is wrong - Pottus - 12.02.2017

floats are not exact that is why you always use <= or => when making comparisons.

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Re: float is wrong - Dayrion - 12.02.2017

I've already see that somewhere. It's about compiling.
I don't know why but it's compiling like 0.49999999999999999999...
It's the same thing with 1.0 : 0.99999...

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Re: float is wrong - GoldenLion - 12.02.2017

Well 0.5 is exact for me. Is it possible to round 0.004999 to 0.005 as a workaround?

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Re: float is wrong - Vince - 12.02.2017

It's the same thing as trying to display 1/3 in base 10: 0.33333... You know that 1/3 + 1/3 + 1/3 equals 1 but a computer will say its 0.33 + 0.33 + 0.33 = 0.99999... That's just how floating point arithmetic works. As far as I know it's not possible to round the fractional part.

http://www.youtube.com/watch?v=PZRI1IfStY0

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Re: float is wrong - GoldenLion - 12.02.2017

Alright, thanks. I think I'll just add like 0.000001 when I need to show it somewhere.

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