Which of the following correctly initializes a doubly linked list in the default constructor?
A) head = NULL;
Back = NULL;
B) head = 0;
Back = 0;
Count = 0;
C) first = 0;
Last = 0;
D) first = NULL;
Last = NULL;
Count = 0;

Question

Quizplus · Accepted Answer

The best choice for initializing a doubly linked list in the default constructor is to set both the head and the tail to NULL or nullptr. Therefore, option D, which initializes first and last to NULL, is the correct choice. Additionally, setting Count to 0 is also a necessary step to indicate that the list is currently empty.

Which of the Following Correctly Initializes a Doubly Linked List