Question

ML or java please

assume that you have the following datatype

datatype 'a mylist = NIL | CONS of'a * 'a mylist;

write a function reverse of type 'a mylist -> 'a mylist that takes a mylist a and returns my list of all the elements lf a, in jnverse order

Answer 1

Java code

import java.util.ArrayList;
public class MyList {

   public static void main(String[] args) {
       // TODO Auto-generated method stub

      
  
      
       ArrayList<Integer> list = new ArrayList<Integer>();
      
       for(int i=0;i<10;i++) {
           list.add(i);
       }
      
       System.out.println("List Before passing to function : \n");
       print(list);
      
       list = reverse(list);
      
       System.out.println("List After passing to function : \n");
       print(list);
      
   }

   private static void print(ArrayList list) {
      
      
       for(int i=0;i<list.size();i++)
           System.out.print(list.get(i)+" ");
      
       System.out.println();
   }

   private static ArrayList reverse(ArrayList list) {
       // TODO Auto-generated method stub
       ArrayList result = new ArrayList<>();
      
       for(int i=list.size()-1;i>=0;i--) {
          
           result.add(list.get(i));
       }
      
       return result;
   }

}

Output

List Before passing to function :

0 1 2 3 4 5 6 7 8 9
List After passing to function :

9 8 7 6 5 4 3 2 1 0

Screenshot

Feel free to ask any doubts, if you face any difficulty in understanding.

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