Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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.
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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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