Q. Program to insert a new node at the beginning of the circular linked list.ExplanationIn this program, we will create a circular linked list and insert every new node at the beginning of the list. If the list is empty, then head and tail will point to the newly added node. If the list is not empty, then we will store the data of the head into a temporary node temp and make new node as the head. This new head will point to the temporary node. In simple words, the newly added node will be the first node(head) and previous head(temp) will become the second node of the list. Show
After inserting new node to the beginning of the list New represents the newly added node. Earlier A was the head of the list. When new is added to the beginning of the list, new will become the new head, and it will point to the previous head, i.e., A. Algorithm
Circular Singly Linked List | InsertionWe have discussed Singly and Circular Linked List in the following post: Why Circular? In a singly linked list, for accessing any node of the linked list, we start traversing from the first node. If we are at any node in the middle of the list, then it is not possible to access nodes that precede the given node. This problem can be solved by slightly altering the structure of a singly linked list. In a singly linked list, the next part (pointer to next node) is NULL. If we utilize this link to point to the first node, then we can reach the preceding nodes. Refer to this for more advantages of circular linked lists. In this post, the implementation and insertion of a node in a Circular Linked List using a singly linked list are explained. Implementation The pointer last points to node Z and last -> next points to node P. Why have we taken a pointer that points to the last node instead of the first node? Insertion
Insertion in an empty List After inserting node T, After insertion, T is the last node, so the pointer last points to node T. And Node T is the first and the last node, so T points to itself. C++
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After insertion, Function to insert nodes at the beginning of the list, C++
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After insertion, Function to insert a node at the end of the List C++
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After searching and insertion, Function to insert a node at the end of the List, C++
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The following is a complete program that uses all of the above methods to create a circular singly linked list. C++
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Output: 2 4 6 8 10 12This article is contributed by Anuj Chauhan. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to . See your article appearing on the GeeksforGeeks main page and help other Geeks.
Article Tags :
Linked List
circular linked list Practice Tags :
Linked List circular linked list Circular Linked ListIn this article, you will learn what circular linked list is and its types with implementation. A circular linked list is a type of linked list in which the first and the last nodes are also connected to each other to form a circle. There are basically two types of circular linked list: 1. Circular Singly Linked List Here, the address of the last node consists of the address of the first node. Circular Linked List Representation2. Circular Doubly Linked List Here, in addition to the last node storing the address of the first node, the first node will also store the address of the last node. Circular Doubly Linked List RepresentationNote: We will be using the singly circular linked list to represent the working of circular linked list. Inserting a node at the beginning of a linked listThe new node will be added at the beginning of a linked list. ExampleAssume that the linked list has elements: 20 30 40 NULL If we insert 100, it will be added at the beginning of a linked list. After insertion, the new linked list will be 100 20 30 40 NULL Required knowledgeBasic C programming, Functions, Dynamic memory allocation, Circular linked list Algorithm to insert a new node at the beginning of a Circular linked listFor inserting new node at the beginning of a circular linked list. We need to connect new node with the first node and re-connect the last node with new node instead of head node. Algorithm to insert new node at the beginning of Circular linked list
%%Input : head {Pointer to first node of the linked list}
Begin
If (head == NULL) then
write ('List is empty')
End if
Else then
alloc (newNode)
read (data)
newNode.data ← data;
newNode.next ← head;
current ← head;
While (current.next != head) do
current ← current.next;
End while
current.next ← newNode;
End if
End C Exercises: Insert a node at the beginning of a circular linked listLast update on December 20 2021 09:10:12 (UTC/GMT +8 hours) |