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