Odd trace on object stage position

programming flash
1

Hi,

I noticed odd trace that wonder whether someone can explain.

I’ve got the following code in an ENTER_FRAME event. It’s used to move an object.

_vx +=0.2;
_vy +=0.2;

x+=_vx;
y+=_vy;

trace("_vx: " + _vx);
trace("x: " + x);
trace("----------");

The trace for the first 5 frames looks like this:

_vx: 0
x: 275
----------
_vx: 0.2
x: 275.2
----------
_vx: 0.4
x: 275.55
----------
_vx: 0.6000000000000001
x: 276.15
----------
_vx: 0.8
x: 276.95

Obviously, 275.2 + 0.4 doesn’t equal 275.55.

Does anyone know the reason for this?

Thanks!
Dandylion13