Starting Out with C++: Early Objects
Starting Out with C++: Early Objects
8th Edition
ISBN: 9780133360929
Author: Tony Gaddis, Judy Walters, Godfrey Muganda
Publisher: Addison-Wesley
Expert Solution & Answer
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Chapter 17.2, Problem 17.6CP

Explanation of Solution

Appending a node:

It is the process of adding a new node at the end of a linked list.

Inserting a node:

It is the process of adding a new node at a specific location in a list.

Member function for appending a node:

The following member function is used to append the received value into a list at end:

//Definition of appendNode() function

void IntList::appendNode(int num)

{

//Declare a structure pointer variables

ListNode *newNode, *dataPtr = nullptr;

//Assign a new node

newNode = new ListNode;

//Store the argument value into "newNode"

newNode->value = num;

//Assign the next pointer to be "NULL"

newNode->next = nullptr;

//Condition to check whether the list is empty or not

if (!head)

//If true, make newNode as the first node

head = newNode;

//else part

else

{

//Store head value into dataPtr

dataPtr = head;

//Loop to find the last node in the list

while (dataPtr->next)

//Assign last node to the structure variable

dataPtr = dataPtr->next;

//Insert newNode as the last node

dataPtr->next = newNode;

}

}

Explanation:

Consider the function named “appendNode()” to insert the received value “num” at end of the list.

  • Make a new node and assign a received value “num” into the node.
  • Using “if…else” condition check whether the list is empty or not.
    • If the “head” node is empty, assign a new node into “head” pointer.
    • Otherwise, make a loop to find a last node in the list and insert the value at end of the list.

Member function for inserting a node:

The following member function is used to insert the received value into a list at specific location:

//Definition of insertNode() function

void IntList::insertNode(int num)

{

/*Declare a structure pointer variables*/

ListNode *newNode, *dataPtr, *prev = nullptr;

//Assign a new node

newNode = new ListNode;

//Store the argument value into "newNode"

newNode->value ...

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