Question

C#

Create a “Main” method that contains a 1-Dimensional ArrayList of integers. Randomly fill the ArrayList with at least 10 integers using a recursive method. Then create another method that calculates the sum of that ArrayList using recursion as well. Only use TWO (2) parameters, at most, in these two recursive methods.

Finally, print the array and the sum of ArrayList.

Sample Output:

ArrayList contents: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

The sum of the ArrayList contents: 45

Answer 1

using System.Collections;
using System.Collections.Generic;
using System;
class RandomArrayList
{
//method to fill array list
public static void fillArrayList(ArrayList array, int size)
{
int index = size-1;
if(index<0)
return;
else
{
array.Add(10-size);

fillArrayList(array, size-1);
}
}
  
//method to find the sum of array list
public static int sumArrayList(ArrayList array, int size)
{
if(size-1<0)
return 0 ;
else
{
return (int)array[size-1] + sumArrayList(array, size-1);
}
}
  
  
static void Main()
{
//create an array list
ArrayList myList = new ArrayList();
  
//method calling
fillArrayList(myList, 10);
  
//display the array list content
Console.Write("ArrayList contents: ");
foreach(int i in myList)
Console.Write(i+" ");
  
//display the sum of array list
Console.Write("\nThe sum of the ArrayList contents: ");
Console.WriteLine(sumArrayList(myList, 10));
}
}

OUTPUT: