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

Question

Quizplus · Accepted Answer

The correct way to initialize a doubly linked list in the default constructor is to set the head (or first) and back (or last) pointers to nullptr (or 0). Additionally, the count should also be set to 0 to signify that the list is initially empty. Therefore, choice D is the best choice as it accurately sets all the necessary variables to their appropriate initial values.

Which of the Following Correctly Initializes a Doubly Linked List