# Difference Between Singly Linked List and Doubly Linked List in C++ Data Structures

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## 18 Questions

### What is a linked list?

A linear data structure that includes a series of connected nodes.

### How is the last node in a linked list identified?

Its next portion points to NULL.

### Describe the structure of a Node in a Singly Linked List.

Each node has data and a pointer to the next node.

Each node consists of 3 components: 1. *prev - address of the previous node, 2. data - data item.

### How does a Circular Linked List differ from a Singly Linked List?

In a Circular Linked List, the last node's next portion points back to the first node.

### What is a circular linked list?

A type of linked list where the first and last nodes are connected to form a circle.

### How is a Circular Singly Linked List defined?

The address of the last node consists of the address of the first node.

### Explain a Circular Doubly Linked List.

In addition to the last node storing the address of the first node, the first node also stores the address of the last node.

### What is the main difference between a Singly Linked List and a Doubly Linked List?

Singly Linked List allows traversal in only one direction, while Doubly Linked List allows traversal in both forward and backward directions.

### How can a circular linked list be represented in an algorithm or code?

By having the last node point to the first node, creating a circular structure.

### What data items are represented by the nodes 'one', 'two', and 'three' in the given code snippet?

The data items 1, 2, and 3 respectively.

### What is the key feature of a doubly linked list?

It allows traversal in both forward and backward directions.

### How is a node represented in a doubly linked list?

A node in a doubly linked list contains data and pointers to the next and previous nodes.

### Explain the concept of a circular linked list.

In a circular linked list, the last node's next pointer points back to the first node, forming a circle.

### What are some applications of a doubly linked list?

Applications include redo and undo functionality, forward and backward navigation in browsers.

### How does a singly linked list differ from a doubly linked list?

A singly linked list has each node pointing only to the next node, while a doubly linked list has pointers to both next and previous nodes.

### Explain the significance of forward and backward navigation in a circular linked list.

Forward and backward navigation in a circular linked list provides seamless traversal without reaching the end.

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