Scala 中各种类型函数的定义

object Test02_FunDefine {
  def main(args: Array[String]): Unit = {
    //（1）函数1：无参，无返回值
    def sayHi() = {
      println("hi")
    }

    sayHi()

    //（2）函数2：无参，有返回值
    def sayHi1():String = {
      println("hi")
      "linhai"
    }
    val str = sayHi1()
    println(sayHi1())
    println(str)

    //（3）函数3：有参，无返回值
    def sayHi2(name:String) = {
      println(s"hi $name")
    }
    sayHi2("linhai")

    //（4）函数4：有参，有返回值
    def sayHi3(name:String,age:Int):String = {
      s"${age}岁的${name}正在吃饭"
    }

    println(sayHi3("linhai", 7))
    //（5）函数5：多参，无返回值
    def sayHi4(name:String,age:Int):Unit = {
      println(s"$age 岁的$name")
    }
    sayHi4("linhai",4)

    //（6）函数6：多参，有返回值
    def sayHi5(name:String,age:Int):String = {
      s"${age}岁的${name}正在吃饭"
    }

    println(sayHi5("linhai", 14))
  }

}