第一章
第一节
1.1.1:第一节
val max = (x: Int, y: Int) => if (x > y) x else y
val max = (x: Int, y: Int) => if (x > y) x:Int else y:Int
val max = (x: Int, y: Int) => if (x > y) x:Int else y:String --no
val max = (x: Int, y: Int) => if (x > y) x:Int else