How to round up a number if it's not an integer?

Question

I want to calculate a simple number, and if the number is not an integer I want to round it up.

For instance, if after a calculation I get 1.2, I want to change it to 2. If the number is 3.7, I want to change it to 4 and so on.

score 41 · Accepted Answer · answered Aug 30 '15 at 15:58

41

You can use math.ceil to round a Double up and toInt to convert the Double to an Int.

def roundUp(d: Double) = math.ceil(d).toInt

roundUp(1.2) // Int = 2
roundUp(3.7) // Int = 4
roundUp(5) // Int = 5

answered Aug 30 '15 at 15:58

Peter Neyens

the thing is that im not sure if its double...im doing some calculation and the result can be either a double or an int – nick shmick Aug 30 '15 at 16:11
If it is an `Int` it will be converted to a `Double` for you automatically (see `roundUp(5)`). – Peter Neyens Aug 30 '15 at 16:32

score 0 · Answer 2 · answered May 28 '20 at 20:25

0

The ceil function is also directly accessible on the Double:

3.7.ceil.toInt // 4

answered May 28 '20 at 20:25

Xavier Guihot

score -1 · Answer 3 · answered May 21 '18 at 20:30

-1

Having first imported math
import scala.math._ (the final dot & underscore are crucial for what comes next)

you can simply write
ceil(1.2) floor(3.7)

plus a bunch of other useful math functions like
exp(1) pow(2,2) sqrt(pow(2,2)

answered May 21 '18 at 20:30

olisteadman

3 Answers3