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  1. object Main{
  2. def doSomething(l : MyList, i : Int):MyList = {
  3.     l match {
  4.         case Nil() => Nil()
  5.         case Cons(e,tail) if e > i => Cons(e,doSomething(tail,i))
  6.         case Cons(e,tail)    => doSomething(tail,i)
  7.     }
  8. }
  9.  
  10. def doIt(l : MyList) : Int = {
  11.     l match {
  12.     case Nil() =>
  13.         print(0)
  14.         0
  15.     case Cons(v,t) => 
  16.        print(v + doIt(t))
  17.        v
  18.     }
  19. }
  20. def doIt(l : MyList, i : Int) : MyList = {
  21.     (l,i) match {
  22.         case (Nil(),_)   => Nil()
  23.         case (_,0)           => Nil()
  24.         case (Cons(e,t),j) => Cons(e,doIt(t,j-1))
  25.     }
  26. }
  27. def main(args: Array[String]) {
  28. val ll = Cons(1,Cons(2,Cons(3,Nil())))
  29. val k = doIt(ll)
  30. }
  31. }
  32. abstract case class MyList
  33.  
  34. case class Nil extends MyList
  35.  
  36. case class Cons(cur : Int , follow : MyList) extends MyList
  37.  
  38. object MyList {
  39.   def push(n : Int, l : MyList):MyList = {
  40.     Cons(n,l)
  41.   }
  42.   def tail(l : MyList) : MyList = {
  43.     l match{
  44.       case Nil() => Nil()
  45.       case Cons(c,f) => f
  46.     }
  47.   }
  48.     def pop(l : MyList) : (Int,MyList) = {
  49.       l match{
  50.       case Nil() => throw new IllegalArgumentException("wrong parameter")
  51.       case Cons(c,f) => (c,f)
  52.       }
  53.     }
  54. }
Success #stdin #stdout 0.07s 211584KB
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0353
https://ideone.com/Cb7q2
language:
Scala (scala 2.12.8)
created:
14 years ago
visibility:
public

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