Find area of Shapes using Scala

def areaOfShapes(): Unit ={
  var choice:Int=0  var r:Int=0  var l:Int=0  var w:Int=0  var b:Int=0  var h:Int=0
  var area:Float=0
  println("Input 1 for to Calculate Area of Circle")
  println("Input 2 for to Calculate Area of Rectangle")
  println("Input 3 for to Calculate Area of Triangle")
  print("Please Input Your Number :")
  choice=scala.io.StdIn.readInt()

  choice match {
    case 1 =>
      print("Input radious of circle :")
      r=scala.io.StdIn.readInt()
      area=(3.14*r*r).toFloat

    case 2 =>
      print("Input length of rectangle :")
      l=scala.io.StdIn.readInt()
      print("\nInput width of rectangle :")
      w=scala.io.StdIn.readInt()
      area=(l*w).toFloat

    case default =>
      print("Input base of triangle :")
      b=scala.io.StdIn.readInt()
      print("\nInput height of triangle :")
      h=scala.io.StdIn.readInt()
      area=(0.5*b*h).toFloat
  }

  println("The area is :"+area)

}

areaOfShapes()