gistfile1.txt

// the solution 

// 1. declare the class Number(Int)
// 2. define method Number.inc(): Number
// 3. define method Number.dec(): Number
// 4. define getNumber():Int

class Number(var n : Int) {

  def inc(): Number = {
    n + 1    
  }
  def dec(): Number = {
    n - 1
  }
  def getNumber() : Int = {
    return n
  }
}