Linked List

Doubly Linked List – When compared to a Single Linked List, a Doubly Linked List is a version of a Linked List in which mobility is available in both directions, forward and backward.

Following are the important terms to understand the concept of doubly linked list.

  • Link − Each link of a linked list can store a data called an element.
  • Next − Each link of a linked list contains a link to the next link called Next.
  • Prev − Each link of a linked list contains a link to the previous link called Prev.
  • LinkedList − A Linked List contains the connection link to the first link called First and to the last link called Last.

Insertion – The code below shows the insertion action at the start of a doubly linked list.

//insert link at the first location
void insertFirst(int k, int d) {

   //create a link
   struct node *link = (struct node*) malloc(sizeof(struct node));
   link->k = k;
   link->d = d;
	
   if(isEmpty()) {
      //make it the last link
      last = link;
   } else {
      //update first prev link
      head->prev = link;
   }

   //point it to old first link
   link->next = head;
	
   //point first to new first link
   head = link;
}

Deletion – The code below displays the deletion action at the start of a doubly linked list.

//delete first item
struct node* deleteFirst() {

   //save reference to first link
   struct node *tempLink = head;
	
   //if only one link
   if(head->next == NULL) {
      last = NULL;
   } else {
      head->next->prev = NULL;
   }
	
   head = head->next;
	
   //return the deleted link
   return tempLink;
}
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