Android Question Problem with Power function

[MDimitris]

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

I use b4x version 7.30
Thanks

 

[An Schi]

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

 

[MDimitris]

hi,
my code is:

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

 

[An Schi]

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

 

[MDimitris]

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

 

[An Schi]

Ok, i'm out
Till some experts arrive i suggest you play wirh NumberFormat.
Sorry for not being a better help

 

[stevel05]

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]

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

 

[MDimitris]

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]

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]

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]

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

- Colin.