What is meant by circular linked list? Write an algorithmto insert a node at the end in a circular linked list.1 2 3

A circular linked list is a type of linked list where the last node points back to the first node, creating a circular structure. In other words, the next pointer of the last node points to the first node instead of being null.

To insert a node at the end of a circular linked list, you can follow the following algorithm:

1. Create a new node with the given value.
2. If the circular linked list is empty, set the next pointer of the new node to itself and make it the first node.
3. Otherwise, traverse the circular linked list until you reach the last node. You can do this by starting at the first node and moving to the next node until you reach the first node again.
4. Set the next pointer of the last node to the new node.
5. Set the next pointer of the new node to the first node.
6. Update the last node pointer to the new node.

Here is the algorithm to insert a node at the end in a circular linked list:

function insertAtEnd(value):
    newNode = createNode(value)
    
    if circularLinkedList is empty:
        newNode.next = newNode
        circularLinkedList.first = newNode
        circularLinkedList.last = newNode
    else:
        currentNode = circularLinkedList.first
        while currentNode.next != circularLinkedList.first:
            currentNode = currentNode.next
        
        currentNode.next = newNode
        newNode.next = circularLinkedList.first
        circularLinkedList.last = newNode

Using this algorithm, you can insert a node with the value 3 at the end of the circular linked list with the values 1, 2.