zad 2 lab 11

val s = Stream.cons(1.0f,Stream.cons(2.0f,Stream.cons(3.0f,Stream.empty)));;

def potegi(list:Stream[Float]):Stream[Float] =
    {
   def zad1(list:Stream[Float],result:Stream[Float],n:Int,i:Int,prev:Float):Stream[Float]={
     (list,result,n,i,prev) match{
       case (_,_,_,_,_) if list.isEmpty=>result.reverse
       case (list,result,n,i,prev) if n<=i => zad1(list.tail,result,n+1,0,1)
       case (list,result,n,i,prev) => zad1(list,Stream.cons(list.head*prev,result),n,i+1,prev*(list.head))
     }
   }
      if(list.isEmpty) Stream.empty
      else  zad1(list,Stream.empty,1,0,1)
    }

potegi (s)