NaN

[Stephanie Grasson]

I just got the RHE Java2 Certification study guide.
I was surprised to see that a double divided by 0 is equal to Double.NEGATIVE_INFINITY. All other books I had read said that a double divided by 0 was equal to Double.NaN.
Now I am curious. What sort of operation would result in Double.NaN?

[cata lin]

Hi,
Try
System.out.println(Math.sqrt(-1.0));
Note that it does not throw any exception.

[Stephanie Grasson]

Thanks Cata Lin.
That makes a lot of sense.