Create abstract class Shape with abstract functions volume() and display(). Extend two classes Cube and Cylinder from it. Calculate volume of each and display

abstract class shape(r:Int,h:Int)
{
var vol1:Double=0
var pi:Double=3.14

  def volume()
  def display()
}
class cylinder(r:Int,h:Int)extends shape(r,h)
{
  def volume()
  {
    var vol:Double=0
    vol=pi*r*r*h
    vol1=vol
    println("*****")
    println("volume is:"+vol)
  }
  
  def display()
  { println("***")
    println("radius of cylinder:"+r)
    println("height of cylinder:"+h)
    println("volume of cylinder:"+vol1)
  }
}
object Demo4
{
  def main(args:Array[String])
  {
    var radius:Int=0
    var height:Int=0
    println("enter radius of cylinder:")
    radius=scala.io.StdIn.readInt()
    
    println("enter hight of cylinder")
    height=scala.io.StdIn.readInt()
    
    var n=new cylinder(radius,height)
    n.volume()
    n.display()
  }
}