Simple List Class in C++

#include <cstdlib>
#include "Node.h" //Your Node class, see previous post

using namespace std;

class List
    {
        public:
            List(){
                head= NULL;
            }
            ~List(){
                destroyList(head);
            }
            void append(int d){
                head = append(head, d);
            }
            void print(){
                if (head != nullptr)
                print(head);
            }
            void insertInOrder(int d){
                head = insertInOrder(head, d);
            }
            bool findValue (int d){
                return findValue(head, d);
            }
            int getSize(){
                return getSize(head);
            }
    
        private:
            Node *head; //Remember this struct from the previous post

            /* Destroy the list
            * We recursively call the destroy function to cycle through a list to the end.
            * Once the end node is reached, it is deleted. Then as we progress back through
            * our recursive call, each associated node is deleted from the end up.
            * This is called by our destructor to clean everything up.
            */
            void destroyList(Node *n){
                if (n->next != nullptr){
                    destroyList(n->next);
                }
                delete n;
            }

            /* Add a Node to the end of a list
            * Use recursion to cycle through the list to the end
            * Once the end is reached, the next pointer of the last node will by nullptr.
            * A new Node will then be inserted replacing that nullptr and chaining to the list
            */
            Node* append(Node *n, int d){
                if (n == nullptr){
                    return new Node(d);
                }
                else {
                    n->next= append(n->next, d);
                }
                return n;
            }

            /* Print the List
            * Use recursion to loop through and print each Node in a list
            */
            void print(Node *n){
                cout << n->data << endl;
                if (n->next != nullptr){
                    print(n->next);
                }
            }

            /* Insert a Node in Numeric order
            * Loop throug a list using recursion
            * Once the inserting value is less than the current Node
            * we know we need to insert the Node in that position
            * else we keep cycling through
            */
            Node* insertInOrder(Node *n, int d){
                if (n == nullptr){
                    return new Node(d);
                }
                else if (d > n->data){
                    n->next= insertInOrder(n->next, d);
                }
                else {
                    Node* temp = n; //Temp copy
                    n = new Node(d); //Set the pointer to a new Node
                    n->next = temp; //Chain the original onto the new Node's next pointer
                }
                return n;
            }

            /* Find a Node
            * Loop through the enitre list using recursion
            * Return true once the Node value we want is found
            */
            bool findValue(Node *n, int d){
                if (n->data == d){
                    return true;
                }
                else if(n->next != nullptr){
                    return findValue(n->next, d);
                }
                return false;
            }

            /* Get the Size of a List
            * Use recursion to cycle through the list
            * all the while keeping a counter going of each Node encountered
            */
            int getSize(Node *n, int i = 0){
                if (n != nullptr){
                    ++i;
                    return getSize(n->next, i);
                }
                return i;
            }

    };