abstract class

create abstract class shape with abstract functions volume() and display().Extend two classes cube and cylinder from it.
calculate volume of each and display it
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=pirr*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 MainObject{
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()
}
}