Write a C++ recursive method doubleElements that has one parameter, an ArrayList

ID: 3768325 • Letter: W

Question

Write a C++ recursive method doubleElements that has one parameter, an ArrayList of strings. This method modifies the ArrayList by replacing every string with two copies of that string. For example, if the list has the values {"recursion", "is", "cool"} before the method is called, it should have the values {"recursion", "recursion", "is", "is", "cool", "cool"}. You may assume that the ArrayList specified is not null. You may not create any new ArrayLists or arrays. HINT: You will need a helper method that will be the recursive method.

Explanation / Answer

import java.util.*;

class word_copy_arrayList
{
public static void main(String args[])
{

       int i,n;

       String s;
       ArrayList<String> list = new

ArrayList<String>();
       list.add("aaa");
       list.add("bbb");
       list.add("ccc");
       n=list.size();
       for(i=0;i<=n;i=i+2)
       {

           list.add(i+1,list.get(i));

       }

       n=list.size();
       for(i=0;i<n;i++)
       {

System.out.println(list.get(i));
       }
   }
}

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Write a C++ recursive method doubleElements that has one parameter, an ArrayList

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