Chapter 17, Problem 33RQE

Program Plan Intro

Purpose of the given code:

The given code is trying to insert the value of the variable “num” into the end of a linked list.

Given Code:

//Definition of function

void NumberList::appendNode(double num)//Line 1

{//Line 2

//Declaration of structure pointer variable

ListNode *newNode, *nodePtr;//Line 3

//Allocate a new node & store num

//Error #1

newNode = new listNode;//Line 4

newNode->value = num;//Line 5

// If there are no nodes in the list

// make newNode the first node

if (!head)//Line 6

head = newNode;//Line 7

// Otherwise, insert newNode at end

else //Line 8

{//Line 9

//Error #2

// Find the last node in the list

while (nodePtr->next)//Line 10

nodePtr = nodePtr->next;//Line 11

// Insert newNode as the last node

nodePtr->next = newNode;//Line 12

}//Line 13

}//Line 14