Android Question Problem with Power function

MDimitris · Aug 25, 2017

Hello,
Can someone explain me why
power(5,4) return 624.9999999999997 ?

I use b4x version 7.30
Thanks

An Schi · Aug 25, 2017

Noone can answer without seeing your code...
I guess you are using int, double, long etc wrong or you use NumberFormat wrong.

MDimitris · Aug 25, 2017

hi,
my code is:

dim xx as double
xx=power(5,4)
....
....

An Schi · Aug 25, 2017

If this is realy all your code, which deals with this - then i don't understand......

MDimitris · Aug 25, 2017

this is a test like you test but ...
I do not understand...

thank you

An Schi · Aug 25, 2017

Ok, i'm out

Till some experts arrive i suggest you play wirh NumberFormat.
Sorry for not being a better help

stevel05 · Aug 25, 2017

It sounds like it may be a device specific result.

What device are you running it on? Do you have a different one to try.

Gives 625 on both Bluestacks and my Sony Xperia.

An Schi · Aug 25, 2017

For the statistic:
625 on galaxy s4 with android 5.0.1 and b4a 7.30

MDimitris · Aug 25, 2017

hello,
You are right. With an Alcatel device (android 6.0.1) is correct 625, with Alcatel (android 2.3.6) correct 625 but with another device Turbox model s (android 4.4.4) return 624.9999997

Erel · Aug 27, 2017

Never show double values without using NumberFormat (or the equivalent smart string modifier). NumberFormat will take care of rounding the value based on the required number of decimals.

Mahares · Aug 27, 2017

Erel said:
Never show double values without using NumberFormat (or the equivalent smart string modifier). NumberFormat will take care of rounding the value based on the required number of decimals.

But this does not tell us why the answer is correct 625 on many devices without invoking the numberformat or smart string, but not on others.

Computersmith64 · Aug 28, 2017

This might help explain it (or not!) - http://floating-point-gui.de/

- Colin.

Android Question Problem with Power function

MDimitris

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