Get random number between two numbers in Scala

Question

How do I get a random number between two numbers say 20 to 30?

I tried:

val r = new scala.util.Random r.nextInt(30) 

This allows only upper bound value, but values always starts with 0. Is there a way to set lower bound value (to 20 in the example)?

Thanks!

Answer 1

You can use below. Both start and end will be inclusive.

val start = 20 val end   = 30 val rnd = new scala.util.Random start + rnd.nextInt( (end - start) + 1 )   

In your case

val r = new scala.util.Random val r1 = 20 + r.nextInt(( 30 - 20) + 1) 

Answer 2

Starting Scala 2.13, scala.util.Random provides:

def between(minInclusive: Int, maxExclusive: Int): Int

which used as follow, generates an Int between 20 (included) and 30 (excluded):

import scala.util.Random Random.between(20, 30) // in [20, 30[