Given two double values, a and b, calculate a / b. Return an int indicating the nature of the result:

Return 0 if the result is a normal, finite number.

Return 1 if the result is Double.POSITIVE_INFINITY.

Return -1 if the result is Double.NEGATIVE_INFINITY.

Return 2 if the result is Double.NaN (Not a Number). Caution here: Double.NaN has some unusual behavior as a value because Double.NaN == (any double value) always evaluates to false. You could use String conversion, or the handy helper method Double.isNaN to check this one.