Question

It’s giving me this error for lines 21 and 22, which are the ones I’ve noted. Judging from other cases with similar error messages, I’ve got a syntax error somewhere. I just can’t figure out what.. Here’s my .cpp file:

#include <iostream>
#include <cstdlib>

#include "deque.h"

using namespace std;

struct node{
    int data;
    node *prev;
    node *next;
};

Deque::Deque(){
    count = 0;

    node->head->next = node->head;         //error on this line
    node->head->prev = node->head;         //and this one
}

Here’s my header file:

# ifndef DEQUE_H
# define DEQUE_H


class Deque
{
private:
    int count;
    class node *head;
public:
    Deque();
    ~Deque();
    int size();
    void addFirst(int);
    void addLast(int);
    int removeFirst();
    int removeLast();
    int getFirst();
    int getLast();

};
#endif

Answer 1

Correct code for these lines:

head->next = head;
head->prev = head;

Your variable is named head, and node is its type, but there is no member named node in your class Deque