《Scala》之def函數

 scala與python很類似，使用def作爲函數聲明關鍵字，

def 函數名稱(參數列表):函數返回值類型={函數體}

def looper(x: Long, y: Long): Long = {
    var a = x
    var b = y
    while (a != 0) {
      val temp = a
      a = b % a
      b = temp
    }
    //返回值
    b
  }

若無返回值則返回值類型設置爲Unit

def looper(x: Long, y: Long): Unit = {
    var a = x
    var b = y
    while (a != 0) {
      val temp = a
      a = b % a
      b = temp
    }
  }