
Concept explainers
Purpose of the given code:
The given code is trying to remove a value from the linked list; the value to be removed is stored in the variable “num”.
Given Code:
//Definition of function
void NumberList::deleteNode(double num)//Line 1
{//Line 2
//Declaration of structure pointer variable
ListNode *nodePtr, *previousNode; //Line 3
// If the list is empty, do nothing
if (!head)//Line 4
return;//Line 5
//Determine if the first node is the one
if (head->value == num)//Line 6
//Error #1
//Delete “head” value
delete head;//Line 7
//Error #2
else//Line 8
{//Line 9
// Initialize nodePtr to head of list
nodePtr = head;//Line 10
/* Skip all nodes whose value member is not equal to num */
while (nodePtr->value != num)//Line 11
{//Line 12
previousNode = nodePtr;//Line 13
nodePtr = nodePtr->next;//Line 14
}//Line 15
/* link the previous node to the node after nodePtr, then delete nodePtr */
previousNode->next = nodePtr->next;//Line 16
delete nodePtr;//Line 17
}//Line 18
}//Line 19

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