Linked List Basic Class

LinkedList.cpp

class Node
{
    Node* next;
    int data;
public:
    
    friend class NodeAlgo;

    ~Node(void);
    Node(int d): next(NULL), data(d) { };
    
    void appendToTail(int d);
    void printAll();

    // Comparisons
    bool operator<(const Node& node) const;
    bool cmp (const Node& node1, const Node& node2) const;

    // Data functions
    int getData() { return data; }
};