What do these three special floating-point values mean: positive infinity, negative infinity, NaN?

Question

How can we use them in our codes, and what will cause NaN(not a number)?

Answer 1

• 1/0 will result in positive infinity.
• 0/0 will result in Nan. You can use NaN as any other number, eg: NaN+NaN=NaN, NaN+2.0=NaN
• -1/0 will result in negative infinity.

Infinity (in java) means that the result of an operation will be such an extremely large positive or negative number that it cannot be represented normally.