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Python program to create a Circular Linked List of N nodes and count the number of nodes
When it is required to create a circular linked list that has 'N' nodes, and get the count of the number of nodes, a 'Node' class needs to be created. To display the data elements in the circular list, another method can be defined, that would display the data. In this class, there are two attributes, the data that is present in the node, and the access to the next node of the linked list. In a circular linked list, the head and the rear are adjacent to each other.
They are connected to form a circle, and don't have 'NULL' value in the last node.
Another 'linked_list' class needs to be created that would have an initialization function, and the head of the node would be initialized to 'None'.
Below is a demonstration for the same −
Example
class Node:
def __init__(self, my_data):
self.data = my_data
self.next = None
def add_data(head_ref,my_data):
ptr_1 = Node(0)
temp = head_ref
ptr_1.data = my_data
ptr_1.next = head_ref
if (head_ref != None) :
while (temp.next != head_ref):
temp = temp.next
temp.next = ptr_1
else:
ptr_1.next = ptr_1
head_ref = ptr_1
return head_ref
def count_node(head):
temp = head
result = 0
if (head != None) :
while True :
temp = temp.next
result = result + 1
if (temp == head):
break
return result
if __name__=='__main__':
head = None
head = add_data(head, 78)
head = add_data(head, 56)
head = add_data(head, 22)
print("Elements are added to list")
print("The number of nodes are : ")
print(count_node(head))Output
Elements are added to list The number of nodes are : 3
Explanation
- The 'Node' class is created.
- Another 'linked_list' class with required attributes is created.
- Another method named 'add_data' is defined, that is used to add data to the circular linked list.
- Another method named 'print_it' is defined that is used to display the linked list data on the console.
- An object of the 'linked_list' class is created, and the methods are called on it to add data.
- This is displayed on the console using the 'print_it' method.
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