Untitled Quiz
16 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What happens when the head of a doubly linked list is NULL and a new node is inserted at position 1?

  • The head is assigned to the new node. (correct)
  • The new node is discarded and no insertion occurs.
  • The new node's next pointer is set to the old head.
  • The new node's prev pointer points to the old head.

    • Which of the following correctly describes the behavior of the insertAtPos function when the specified position is greater than the current size of the list?

  • It creates a new head for the list.
  • It inserts the new node at the beginning of the list.
  • It discards the new node without any changes.
  • It inserts the new node at the end of the list. (correct)

    • What is a prerequisite for safely deleting a node from a doubly linked list using deleteAtPos?

  • The position must be equal to the size of the linked list.
  • The head of the list must not be NULL.
  • The list must have at least one node.
  • The position must be less than or equal to the current size of the linked list. (correct)

    • When a new node is inserted in the middle of a doubly linked list, what must be updated to maintain the list structure?

    <p>Both the next and prev pointers of the adjacent nodes.</p> Signup and view all the answers

    What does the insertLast function do when a new node is added to a doubly linked list?

    <p>It connects the new node to the last node of the list while updating its prev pointer.</p> Signup and view all the answers

    In the deleteAtPos function, which statement is true regarding the head of the list when deleting the first position?

    <p>The head pointer is updated to the next node, and its prev pointer is set to NULL.</p> Signup and view all the answers

    During the insertion of a new node, if the position is specified to be 1, what function is called?

    <p>insertFirst</p> Signup and view all the answers

    When traversing the list to find the position for insertion, which pointer is used to track the current node?

    <p>curr</p> Signup and view all the answers

    What distinguishes a doubly linked list from a singly linked list?

    <p>Each node points to both its successor and predecessor.</p> Signup and view all the answers

    What is the primary advantage of using a doubly linked list for playing multimedia files?

    <p>It supports operations like rewind and fast forward efficiently.</p> Signup and view all the answers

    In the node structure of a doubly linked list, what does the 'prev' pointer refer to?

    <p>The previous node in the sequence.</p> Signup and view all the answers

    What would happen if you attempt to insert a new node into a doubly linked list when it's currently empty?

    <p>The new node becomes the head of the list.</p> Signup and view all the answers

    Which function correctly calculates the size of a doubly linked list?

    <p>It iterates through each node, counting until it reaches the end.</p> Signup and view all the answers

    When inserting a node at the beginning of a doubly linked list, which pointer must be updated to maintain proper linkage?

    <p>Both 'next' of the new node and 'prev' of the current head need updating.</p> Signup and view all the answers

    In the context of a doubly linked list, what should happen to the 'next' pointer of a newly inserted node when adding it last?

    <p>It should point to NULL as it will be the last node.</p> Signup and view all the answers

    What is the initial value of the head pointer in an empty doubly linked list?

    <p>It is NULL.</p> Signup and view all the answers

    Study Notes

    Linked Lists

    • A linked list is a linear data structure.
    • Each element in a linked list is called a node.
    • Each node contains two parts:
      • Data: The value stored in the node.
      • Pointer: A reference to the next node in the list.

    Types of Linked Lists

    • Singly Linked List: Nodes contain only a pointer to the next node.
    • Doubly Linked List: Each node has pointers to both the next and previous node.

    Doubly Linked Lists

    • Each node points to both its predecessor and successor.
      • A next pointer to the successor node.
      • A prev pointer to the predecessor node.

    Doubly Linked List - Motivation

    • Essential for applications requiring "rewind" and "instant replay" features, like video and audio playback.
    • Useful for data requiring forward and backward traversal.

    Doubly Linked List - Node Definition

    • A node structure is defined by:
      • int data; Stores the data value.
      • struct Node* next; Pointer to the next node.
      • struct Node* prev; Pointer to the previous node.
    • struct Node* head = NULL; Declares a head pointer.

    Linked List Size

    • int size(); Function to return the number of elements in a list.
    • Initializes a counter to zero.
    • Traverses the list using a curr pointer from the head.
    • Increments the counter for each node encountered.
    • Returns the final count.

    Doubly Linked List - Insertion at the Beginning

    • void insertFirst(int data);
      • Allocate a new node.
      • Initialize data in the new node.
      • Set next and prev of the new node to NULL.
      • If the head is null, the new node becomes the head. Otherwise, point the new node's next to the current head, and the current head's prev to the new node then make the new node the new head.

    Doubly Linked List - Insertion at the End

    • void insertLast(int data);
      • Allocate a new node.
      • Initialize data in the new node.
      • Set next and prev of the new node to NULL.
      • If the head is null, the new node becomes the head.
      • Otherwise, traverse the list until the last node is reached. Then connect the last node's next to the new node and the new node's prev to the last node.

    Doubly Linked List - Insertion at a Specific Position

    • void insertAtPos(int data, int pos);
      • Checks for invalid position.
      • Implements insertFirst and insertLast.
      • Allocates a new node and initializes the prev and next pointers accordingly.
      • Iterates to the specified position and links the new node in the correct place.

    Doubly Linked List - Deletion

    • void deleteAtPos(int pos);
      • Checks if position is valid.
      • Handles deleting from the beginning, end, and middle.
      • Deallocates the node at the specified position.
      • Updates pointers to maintain the linked list structure.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Linked List Lecture Notes PDF

    More Like This

    Untitled Quiz
    37 questions

    Untitled Quiz

    WellReceivedSquirrel7948 avatar
    WellReceivedSquirrel7948
    Untitled Quiz
    19 questions

    Untitled Quiz

    TalentedFantasy1640 avatar
    TalentedFantasy1640
    Untitled Quiz
    55 questions

    Untitled Quiz

    StatuesquePrimrose avatar
    StatuesquePrimrose
    Untitled Quiz
    50 questions

    Untitled Quiz

    JoyousSulfur avatar
    JoyousSulfur
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser