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Linkedlist Essay

2395 words - 10 pages

Linked List


List vs Arrays
Two built-in data structures that can be used to organize data, or to create other data structures:

• Lists • Arrays

A list is an ordered set of data. It is often used to store objects that are to be processed sequentially.

An array is an indexed set of variables, such as dancer[1], dancer[2], dancer[3],… It is like a set of boxes that hold things. A list is a set of items. An array is a set of variables that each store an item.

Arrays and Lists
You can see the difference between arrays and lists when you delete items.

Arrays and Lists
In a list, the missing spot is filled in when something is deleted.

Arrays and ...view middle of the document...

For example, the following struct could be used to create a list where each node holds a data:
struct Node { int data; Node *next; };


• The next step is to declare a pointer to serve as the list head, as shown below.
Node *head;

• Once you have declared a node data structure and have created a NULL head pointer, you have an empty linked list. • The next step is to implement operations with the list.

Operations in a simple linked list:
• Add or Append a node in the list void appendNode(value); • Insert a node in the list void insertNode(value); • Delete a node from the list void deleteNode(value); • Iterate through the list to display items.

void isplayList(value);

Adding or Appending a Node to the List

• To append a node to a linked list means to add the node to the end of the list. • The pseudocode is shown below. The C++ code follows. Create a new node. Store data in the new node. If there are no nodes in the list Make the new node the first node. Else Traverse the List to Find the last node. Add the new node to the end of the list. End If.

Void appendNode(int value)
Node *newNode, *curr; // Allocate a new node & store data newNode = new Node; newNode->data = value; newNode->next = NULL; // If there are no nodes in the list // make newNode the first node if (!head) head = newNode; else // Otherwise, insert newNode at end { // Initialize curr to head of list curr = head; // Find the last node in the list while (curr->next) curr = curr->next; // Insert newNode as the last node curr->next = newNode; } }

appendNode(int value) appendNode(2.5)

head = new Node;


newNode = new Node; newNode->data = value; newNode->next = NULL;


Making first node as head
The next statement to execute is the following if statement. if (!head) head = newNode;

There are no more statements to execute


Append another node with the value 7.9. appendNode(7.9)
Once again, the first three statements in the function create a new node, store the argument in the node's data member, and assign its next pointer to NULL.
newNode = new Node; newNode->data = value; newNode->next = NULL;


Since head no longer points to NULL, the else part of the if statement executes:
else // Otherwise, insert newNode at end { // Initialize nodePtr to head of list curr = head; // Find the last node in the list while (curr->next) curr = curr->next; // Insert newNode as the last node curr->next = newNode; }



Append another node with the value 12.6. appendNode(12.6)

The third time appendNode is called, 12.6 is passed as the argument. Once again, the first three statements create a node with the argument stored in the value member.
newNode = new Node; newNode->data = value; newNode->next = NULL;


Since head no longer points to NULL, the else part of the if statement executes:
else // Otherwise, insert newNode at end { // Initialize nodePtr to head of list...

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