Difference between Infinity and NaN (Not a number)

Question

When does java print Infinity and when does it print NaN?

Why is 1.0/0.0 infinity but ((1.0/0.0) - (1.0/0.0)) NaN and 0.0f/0.0f an NaN?

What is the differenc

Answer 1

1.00/0 goes infinity but infinity minus infinity is not a number.