// The RecursiveMethods class that implements several recursive solutions
// Your name here

public class RecursiveMethods 
{   
    // This method calls the sumSquareRec method and returns the sum of the 
    // squares of the elements in the array.
    public int sumSquares(int[] A)
    {
        // Do not make any changes to this method!
        return sumSquaresRec(A, 0);
    }    

    // This method takes an integer array as well as an integer (the starting 
    // index) and returns the sum of the squares of the elements in the array.
    public int sumSquaresRec(int[] A, int pos)
    {
        // TODO: implement this method
		
        return -1; // replace this statement with your own return
    }   

    // This method takes a character stack and converts all lower case letters
    // to upper case ones.
    public void upperStackRec(CharStack s)
    {
        // TODO: implement this method            
    }
    
    // This method reads a string and returns the string in the reversed order.
    public String reverseStringRec(String s)
    {
        // TODO: implement this method
		
        return "dummy string"; // replace this statement with your own return
    }
    
    // This method takes a reference to the head of a linked list.
    // It returns the reference to the head of the linked list in the reversed order.
    public LNode reverseListRec(LNode head)
    {
        // TODO: implement this method
		
        return new LNode(-1); // replace this statement with your own return
    }
}