Unwanted Decimal Value When Scaling Object

Questions & Answers
1

var player : Transform;

function OnMouseOver ()
{
	if(Input.GetButtonDown("Fire1"))
	{
		transform.localScale += new Vector3(0F, .1F, 0);
	}	
	
	if(Input.GetButton("Fire2") && transform.localScale.y > .1f)
	{
		transform.localScale += new Vector3(0F, -.1F, 0);
	}
}

I’m using this script to increase scale on object by .1 when I left click and decrease scale by .1 when I right click. When the object’s scale gets above 2.7, it goes to 2.799999 instead of 2.8. Why is this happening and is there a way to prevent it from doing so?

2

This is an inherent problem of floating-point operations. In most cases it shouldn’t affect the logic/behavior. It does, however, creates problems when you need to compare two floating-point values (as 2.8 won’t match 2.799999). Standard approach for these situations is to check whether two values are very close to each other (as opposed to checking for exact equality):

float a = 2.799999;
float b = 2.8;

bool equal = Mathf.Abs(a - b) < 1e-3f;