Why does this happen to Float value?

Haxe
#1

And how to prevent it?

var float:Float = 0;

for (i in 0...10)
{
	float += 0.1;
	trace(float);
}

trace gives this:

0.1
0.2
0.30000000000000004
0.4
0.5
0.6
0.7
0.7999999999999999
0.8999999999999999
0.9999999999999999

thanks

#2
#3

Thanks @player_03. That’s a great video explaining why that’s the case.

#4

Here’s an alternate explanation. It doesn’t really address your original question, but it explains some other concepts and it’s entertaining.

#5

:slight_smile:

I’m using this as a fix:

float = Math.round(float * 10) / 10;

Is there a better way? I’m only interested in increments of 0.1 in my case.

#6

That ought to work. Another option is to store it as an integer, and then divide by 10 before displaying it.

#7

Thanks for your help, @player_03.

#8

Same problem here: do “9.7 * 100” and you wlll get “969.9999999999999”, while if you do “9.7 * 10 * 10” (with a loop) you will get “970” :open_mouth:
“round, fround, ceil, floor…” etc don’t always fix the problem.

Generally these kind of problems arises in the worst moments… :triumph: