参数的定义

object untitled {
  //gender:
  def greet(name:String="笑一笑",age:Int=91,gender:String="男"):Unit={
    println(s"我是${name},我今年${age},${gender}")
  }
  def main(args:Array[String]):Unit={
    greet("笑话",18)//
    greet("小明",20)//
    greet()

    greet(age=20)
    greet(gender="男",age=20)