Floating point errors in specific whole number (angles)

The other day I was making a bouncing DVD screensaver for someone on the forums for a bit of fun and I was frustrated by an error I hadn't seen before.

I was using an event to set bullet angle of motion to 45° yet the angle would always end up at 44.99999999.

Every other angle is fine except for 45° and -45°, meaning that I had to use extra events to check the angle later.

I'm not sure why a floating point error would occur here as it is a whole number. Any ideas?

Project here: 1drv.ms/u/s!AkmrWgxeuxlKhItoFF0OPkagZ00TLQ

Ashley Thanks for that, I was curious to see why it would affect a whole number.

That is exactly what I ended up doing, and it is good to know for future projects.

As a follow up, does the engine, or do certain objects do some internal rounding when an angle is very close to whole number, as it is in this case? I noticed that the text object, when set to bullet.angleofmotion would still display 45 or negative 45 (not 44.9999999) in this case where I have seen it show the actual figure in other situations.

IIRC the Text object does slightly round numbers to avoid getting results like 44.9999999998, but the debugger always shows the original values.