// EXERCISE 5: Complete the following definition, so that "getAndSet" is a (stateless) function
  // that when invoked with integer n returns a pair of functions (that share state) that allow
  // reading and writing a var that is initialized with integer n.  The first function in the pair
  // should be the reader.  The second function in the pair should be the writer.  For example, the
  // following expression should return 5: { val (get, set) = getAndSet (5); set (10); get () }
  // Multiple calls to "getAndSet" should yield independent pairs, i.e., the first pair returned
  // should not share any state with the second pair returned.
  val getAndSet : Int => (() => Int, Int => Unit) = {
    // TODO: Complete the definition.

    (n) =>
    {
      var x = n
      val get : () => Int = {
        () => {
          val ret = x
          ret
        }
        }

      val set : (Int) => Unit = {
        (setterVal) => {
          x = setterVal
        }
      }
      (get, set)
    }

  }