C++ Complete the implementation of the appendNode function for the following linked list class:

class ListNode { public: int value; ListNode *next; ListNode (int nodeValue) { value = nodeValue; next = NULL; } }; class LinkedList { private: ListNode *head; public: LinkedList() { head = NULL; } ~LinkedList(); void appendNode(int); //add to the end of the linked list

}; // YOUR (function) CODE starts HERE ...