transform.localEulerAngles.y = 180 but not less-or-equal 180.0f

Questions & Answers
1

I need some help here. I read the y angle of a transform and test it against <=180.0f which fails. Debug.Log and the inspector however say different. And it should be exact 180.0f because I set the transfrom up that way before.

private float camStartAngleY;

camStartAngleY = transform.localEulerAngles.y;

if (camStartAngleY < 0.0f) camStartAngleY += 360.0f; 	   // make sure value stays between 0 and 360
else if (camStartAngleY > 360.0f) camStartAngleY -= 360.0f;
				
Debug.Log ("camStartAngleY: " + camStartAngleY);

if (camStartAngleY < 180.0f || camStartAngleY == 180.0f)
{
	Debug.Log ("<=180: " + camStartAngleY);
}

Debug.Log says:

camStartAngleY: 180

UnityEngine.Debug:Log(Object)

So what is going on here?

2

Floating point numbers are inherently imprecise, so camStartAngleY == 180.0f is not a reliable test.

http://msdn.microsoft.com/en-us/library/c151dt3s.aspx