This week's book giveaway is in the Cloud/Virtualizaton forum.We're giving away four copies of Mesos in Action and have Roger Ignazio on-line!See this thread for details.
Win a copy of Mesos in Action this week in the Cloud/Virtualizaton forum!

# Dan's question on Math.round()

soumya ravindranath
Ranch Hand
Posts: 300
Question 8 on Math

Which of the following statements is true in terms of the value returned by the java.lang.Math.round method?

a. Rounds the argument to the nearest whole number. If the result is equally close to two whole numbers, then the even one is returned.
b. Rounds the argument to the nearest whole number. If the result is equally close to two whole numbers, then the odd one is returned.
c. Adds 0.5 to the argument and takes the floor of the result.
d. Adds 0.5 to the argument and takes the ceil of the result.
e. None of the above

The answer given is c. The Java API is more specific in saying that
Returns the closest int to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result, and casting the result to type int. In other words, the result is equal to the value of the expression:

(int)Math.floor(a + 0.5f)
and similarly for double-long combination.