Is there a Magic Code for getting delta values?

I am using the code above as well but i am not satisfied with it is there any alternative to that please?

here is why i am not satisfied with it..

here is also the code;

 #pragma strict
 var target : Transform;
 var oldAngle : float;
 var newAngle : float;
 var angle : float;
 oldAngle = $$anonymous$$athf.Atan2((target.position - transform.position).x, (target.position - transform.position).z) * $$anonymous$$athf.Rad2Deg;
 
 function Update ()
 {
      if(Input.Get$$anonymous$$ey($$anonymous$$eyCode.A))
      {
      target.RotateAround(Vector3.zero, Vector3.up, 5);
      }
      else
      {
      target.RotateAround(Vector3.zero, Vector3.up, -5);
      }
 newAngle = $$anonymous$$athf.Atan2((target.position - transform.position).x, (target.position - transform.position).z) * $$anonymous$$athf.Rad2Deg;
 angle = newAngle - oldAngle;
 oldAngle = newAngle;
 Debug.Log(angle);
 }

As well as angle won't increase correctly, it does increase to 270 then all in sudden change to -90, i don't know why.

Ok then, the problem isn't tracking deltas between floats. The problem is dealing with a "wrapped" number space i.e. 360 = 0, 359 = -1.

In your code above, please try replacing Debug.Log(angle); with:

 Debug.Log("old: " + oldAngle + ", new: " + newAngle + ",delta: " + angle);

You will see why the numbers behave like they do.

One useful trick is to normalize them to the range -180 to 180.

This ensures that we have the smallest angle between the other two angles.