Problem Solving with C++ plus MyProgrammingLab with Pearson eText-- Access Card Package (9th Edition)
Problem Solving with C++ plus MyProgrammingLab with Pearson eText-- Access Card Package (9th Edition)
9th Edition
ISBN: 9780133862218
Author: Walter Savitch
Publisher: PEARSON
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Chapter 13.1, Problem 4STE
Program Plan Intro

Linked list:

  • Linked list denotes a linear data structure.
  • The elements are not stored at contiguous locations; the elements are linked using pointers.
  • It stores linear data of similar types not like arrays.
  • The size of linked list can be changed based on requirement.
  • It is represented by a pointer to first linked list node.
  • The first node denotes a head.
  • If linked list is empty, value of head is NULL.
  • The node in a list has two parts, data and pointer to next node.

Given code:

//Define a structure

struct ListNode

{

//Declare variable

string item;

//Declare variable

int count;

//Define next node

ListNode *link;

};

//Create instance

ListNode *head = new ListNode;

Explanation:

  • The “ListNode” defines a structure with “item” and “count” as members.
  • It has a pointer “link” to next element of list.
  • The “ListNode *head = new ListNode” creates an instance of structure and a new element is created.

Complete program:

//Include libraries

#include<iostream>

#include<string>

//Use namespace

using namespace std;

//Define a structure

struct ListNode

{

//Declare variable

string item;

//Declare variable

int count;

//Define next node

ListNode *link;

};

//Create instance

ListNode *head = new ListNode;

//Define main method

void main()

{

//Assign value

head->item = "Wilbur's brother Orville";

//Display value

cout << head->item << endl;

//Pause console window

system("pause");

}

Explanation:

  • The “ListNode” defines a structure with “item” and “count” as members.
  • It contains a pointer “link” to next element of list.
  • The “ListNode *head = new ListNode” creates an instance of structure and a new element is created.
  • The main method assigns value to “item” to head of linked list.
  • The value of head of linked list is been displayed.

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