Linked List

Circular Linked List – The circular linked list is a linked list in which all nodes form a circle. The initial and last nodes in a circular linked list are linked to each other, forming a circle. At the end, there is no NULL.

Insertion – The code below shows an injection activity in a circular linked list relying on a single linked list.

insertFirst(data):
Begin
   create a new node
   node -> data := data
   if the list is empty, then
      head := node
      next of node = head
   else
      temp := head
      while next of temp is not head, do
      temp := next of temp
      done
      next of node := head
      next of temp := node
      head := node
   end if
End

Deletion – The code below shows how to delete items from a circular linked list based on a single linked list.

deleteFirst():
Begin
   if head is null, then
      it is Underflow and return
   else if next of head = head, then
      head := null
      deallocate head
   else
      ptr := head
      while next of ptr is not head, do
         ptr := next of ptr
      next of ptr = next of head
      deallocate head
      head := next of ptr
   end if
End
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