volume of cylinder

abstract class Shape

{

def volume():Double;
def display();
}
class Cylinder(var r:Int,var h:Int) extends Shape
{
def volume():Double=
{
return 3.14rrh;
}
def display()
{
println("Volume Cylinder :"+volume());
}
}
class Cube(var s:Int) extends Shape
{
def volume():Double=
{
return ss*s;
}
def display()
{
println("Volume of cube:"+volume());
}
}
object Slip10
{
def main(args:Array[String])
{
val cyl=new Cylinder(1,1);
cyl.display();
val cub=new Cube(3);
cub.display();
}
}