小编tpa*_*par的帖子

我为'next'和'previous'变量得到了一个不完整的类型错误.我不确定我做错了什么,因为我在用C++编写类时非常生疏.任何帮助,将不胜感激!谢谢.

#include<iostream>

using namespace std;

class LinearNode
{
    public:
        //Constructor for the LinearNode class that takes no arguments 
        LinearNode();
        //Constructor for the LinearNode class that takes the element as an argument
        LinearNode(int el);
        //returns the next node in the set.
        LinearNode getNext();
        //returns the previous node in the set
        LinearNode getPrevious();
        //sets the next element in the set
        void setNext(LinearNode node);
        //sets the previous element in the set
        void setPrevious(LinearNode node);
        //sets the element of the node
        void setElement(int el); …