Five number summary calculator

FiveNumberSummary.scala

import scala.io.StdIn.readLine
import scala.util.Sorting
import scala.math.floor
import scala.util.control.Breaks.{break, breakable}
@main
def main(): Unit = {
  while true
  do
    breakable{
      println("Enter a set of numbers separated by commas")
      var numbers = readLine()
      if numbers == null then break
      val parts = numbers.split(",")
      val list = parts.map(_.trim.toInt)
      list.toList.toFiveNumberSummary() match
        case Some(summary) => {
          println(s"Q1 = ${summary.quartiles.q1}  Q2 = ${summary.quartiles.q2}  Q3 = ${summary.quartiles.q3}")
          println(s"MIN = ${summary.min}  MAX = ${summary.max}")
        }
        case None => println("Please enter more than one number")
    }
}

case class FiveNumberSummary(quartiles: Quartiles, min: Int, max: Int)

case class Quartiles(q1: Double, q2: Double, q3: Double)

extension (list: Iterable[Int])
  def toFiveNumberSummary(): Option[FiveNumberSummary] = {
    if list.size == 1 then return None
    val sortedList = Sorting.stableSort(list.toSeq)
    val min = sortedList(0)
    val max = sortedList.last
    if sortedList.size % 2 == 0 then
      val left = ((sortedList.size - 1)/ 2) - 1
      val right = left + 2
      val q2 = (sortedList(left + 1) + sortedList(left + 2)) / 2.0
      var q1 = 0.0
      var q3 = 0.0
      if (sortedList.size / 2) % 2 == 0 then
        q1 = (sortedList(left / 2) + sortedList((left / 2) + 1)) / 2.0
        q3 = (sortedList((right + sortedList.size - 1) / 2) + sortedList((right + sortedList.size) / 2)) / 2.0
      else
        q3 = sortedList((right + sortedList.size - 1) / 2)
        q1 = sortedList((left + 1) / 2)
      Some(FiveNumberSummary(Quartiles(q1,q2,q3), min, max))
    else
      val left = floor((sortedList.size / 2.0) - 1).toInt
      val right = left + 2
      val middle = left + 1
      val q2 = sortedList(middle)
      var q1 = 0.0
      var q3 = 0.0
      if ((sortedList.size - 1) / 2) % 2 == 0 then
        q1 = (sortedList(left / 2) + sortedList(left / 2 + 1)) / 2.0
        q3 = (sortedList((right + sortedList.size - 1) / 2) + sortedList((right + sortedList.size - 1) / 2 + 1)) / 2.0
      else
        q1 = sortedList((left + 1) / 2)
        q3 = sortedList((right + (sortedList.size - 1)) / 2)
      Some(FiveNumberSummary(Quartiles(q1,q2,q3), min, max))
  }