﻿ C++ - Create and display a doubly linked list

# C++ Linked List Exercises: Create and display a doubly linked list

## C++ Linked List: Exercise-15 with Solution

Write a C++ program to create and display a doubly linked list.

Test Data:
Doubly linked list is as follows:
Traversal in Forward direction:
Orange White Green Red
Traversal in Reverse direction:
Red Green White Orange

Sample Solution:

C++ Code:

``````#include <iostream> // Including input-output stream header file

using namespace std; // Using standard namespace

// A doubly linked list node
struct Node {
string data; // Data field to store string data
struct Node* next; // Pointer to the next node
struct Node* prev; // Pointer to the previous node
};

// Function to append data at the front of the doubly linked list
{
// Create a new node and allocate memory.
struct Node* newNode = new Node;

// Assign data to the new node
newNode->data = new_data;

// A new node has been added with the name head and the previous node
// set to null, since it is being added at the front.
newNode->prev = NULL;

// Previous head is the new node

// Head points to new node
}

// Function to display contents of the doubly linked list
{
Node* last_node;
cout << "\n\nTraversal in Forward direction:\n";
cout << " " << head->data << " "; // Displaying data in forward direction
}
cout << "\n\nTraversal in Reverse direction:\n";
while (last_node != NULL) {
cout << " " << last_node->data << " "; // Displaying data in reverse direction
last_node = last_node->prev;
}
}

// Main program
int main() {
append_data(&head, "Red"); // Appending "Red" at the front of the list
append_data(&head, "Green"); // Appending "Green" at the front of the list
append_data(&head, "White"); // Appending "White" at the front of the list
append_data(&head, "Orange"); // Appending "Orange" at the front of the list
cout<<"Doubly linked list is as follows: ";
return 0; // Returning from the main function
}
``````

Sample Output:

```Doubly linked list is as follows:

Traversal in Forward direction:
Orange  White  Green  Red

Traversal in Reverse direction:
Red  Green  White  Orange
```

Flowchart:

CPP Code Editor: