#ifndef NODE_H
#define NODE_H

class Node {
protected:
    double data;
    Node* next;
    Node* previous;

public:
    // Constructs this node with the specified numerical data value. The next
    // and previous pointers are each assigned nullptr.
    Node(double initialData) {
        data = initialData;
        next = nullptr;
        previous = nullptr;
    }

    // Constructs this node with the specified numerical data value, next
    // pointer, and previous pointer.
    Node(double initialData, Node* nextNode, Node* previousNode) {
        data = initialData;
        next = nextNode;
        previous = previousNode;
    }

    virtual ~Node() {
    }

    // Returns this node's data.
    virtual double GetData() {
        return data;
    }

    // Sets this node's data.
    virtual void SetData(double newData) {
        data = newData;
    }

    // Gets this node's next pointer.
    virtual Node* GetNext() {
        return next;
    }

    // Sets this node's next pointer.
    virtual void SetNext(Node* newNext) {
        next = newNext;
    }

    // Gets this node's previous pointer.
    virtual Node* GetPrevious() {
        return previous;
    }

    // Sets this node's previous pointer.
    virtual void SetPrevious(Node* newPrevious) {
        previous = newPrevious;
    }
};

#endif