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Python program to create a Circular Linked List of n nodes and display it in reverse order
When it is required to create a circular linked list and display it in the reverse order, a 'Node' class needs to be created.
To display the data elements in the circular list in reverse order, another method can be defined, that would reverse 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
class linked_list:
def __init__(self):
self.head = None
def add_data(self,my_data):
new_node = Node(my_data)
new_node.next = self.head
self.head = new_node
def reverse(self):
prev = None
current = self.head
while(current is not None):
next = current.next
current.next = prev
prev = current
current = next
self.head = prev
def print_it(self):
temp = self.head
while(temp):
print(temp.data)
temp = temp.next
my_list = linked_list()
my_list.add_data(47)
my_list.add_data(89)
my_list.add_data(34)
my_list.add_data(11)
print("The list is : ")
my_list.print_it()
print("The list is being reversed")
my_list.reverse()
print("The reversed list is : ")
my_list.print_it()Output
The list is : 11 34 89 47 The list is being reversed The reversed list is : 47 89 34 11
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 'reverse' is defined, that reverses the data stored in a 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 data is added to it.
- It is reversed using the 'reverse' method.
- This is displayed on the console using the 'print_it' method.
Updated on: 13-Mar-2021
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