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A student implementing a linked list wrote this method: 1 bool LinkedList::Remove(int e) { 2 1: for (Node *ptr = _head; ptr != nullptr; ptr ptr->next) %3D 3 1 if (e ptr->element) { 4. Node *deleteMe; 6. deleteMe ptr->next; ptr->next->element; ptr->next->next; %3D 7 ptr->element ptr->next delete deleteMe; %3D 8. %3D 9. 10 return true; } } return false; 11 12 13 14 } The student tested it with this linked list: head nullptr Strangely he found that it worled perfectly except it crashed with a segmentation fault for only one value. What was the value of e that made it crash? What was the number of the line where it crashed?

A student implementing a linked list wrote this method: 1 bool LinkedList::Remove(int e) { 2 1: for (Node *ptr = _head; ptr != nullptr; ptr ptr->next) %3D 3 1 if (e ptr->element) { 4. Node *deleteMe; 6. deleteMe ptr->next; ptr->next->element; ptr->next->next; %3D 7 ptr->element ptr->next delete deleteMe; %3D 8. %3D 9. 10 return true; } } return false; 11 12 13 14 } The student tested it with this linked list: head nullptr Strangely he found that it worled perfectly except it crashed with a segmentation fault for only one value. What was the value of e that made it crash? What was the number of the line where it crashed?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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### Linked List Removal Function A student implementing a linked list wrote this method: ```cpp bool LinkedList::Remove(int e) { for (Node *ptr = _head; ptr != nullptr; ptr = ptr->next) { if (e == ptr->element) { Node *deleteMe; deleteMe = ptr->next; ptr->element = ptr->next->element; ptr->next = ptr->next->next; delete deleteMe; return true; } } return false; } ``` ### Linked List Test Case The student tested it with this linked list: - **Linked List Diagram**: - _head -> 1 -> 2 -> 3 -> nullptr ### Issue Discovered Strangely, the student found that it worked perfectly except it crashed with a segmentation fault for only one value. - **Question 1**: What was the value of `e` that made it crash? - **Question 2**: What was the number of the line where it crashed? ### Analysis of the Crash The issue likely occurs when trying to access or delete a node reference that doesn't exist, particularly when `ptr->next` or `ptr->next->next` is null, leading to undefined behavior or a segmentation fault.
Transcribed Image Text:### Linked List Removal Function A student implementing a linked list wrote this method: ```cpp bool LinkedList::Remove(int e) { for (Node *ptr = _head; ptr != nullptr; ptr = ptr->next) { if (e == ptr->element) { Node *deleteMe; deleteMe = ptr->next; ptr->element = ptr->next->element; ptr->next = ptr->next->next; delete deleteMe; return true; } } return false; } ``` ### Linked List Test Case The student tested it with this linked list: - **Linked List Diagram**: - _head -> 1 -> 2 -> 3 -> nullptr ### Issue Discovered Strangely, the student found that it worked perfectly except it crashed with a segmentation fault for only one value. - **Question 1**: What was the value of `e` that made it crash? - **Question 2**: What was the number of the line where it crashed? ### Analysis of the Crash The issue likely occurs when trying to access or delete a node reference that doesn't exist, particularly when `ptr->next` or `ptr->next->next` is null, leading to undefined behavior or a segmentation fault.
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