CPP Advanced Memory Management Quiz

1. What is a use-after-free error?

Using a pointer after its memory is deallocated

Allocating memory twice

Forgetting to deallocate memory

Using wrong pointer arithmetic

2. What is the purpose of weak_ptr in C++?

To manage temporary objects

To break circular references in shared_ptr

To replace unique_ptr

To improve memory allocation speed

3. Which scenario is most prone to circular reference problems?

Two unique_ptr objects pointing to each other

Two shared_ptr objects pointing to each other

One shared_ptr and one raw pointer

Multiple unique_ptr in a container

4. What does get() return when called on a smart pointer?

The managed object

A raw pointer to the managed object

The reference count

The memory address only

5. What is the primary benefit of using smart pointers over raw pointers?

Automatic memory management

Faster execution

Simpler syntax

Better compiler optimization

6. The ____ operator dereferences a pointer to access its value.

*

&

->

.

7. What is a double delete error?

Deleting the same pointer twice

Deleting two unrelated pointers

Using delete on stack memory

Deleting a null pointer

8. When should you use unique_ptr instead of shared_ptr?

Always use unique_ptr by default

When exclusive ownership is clear

When performance is not critical

Never; shared_ptr is always better

9. What is pointer arithmetic?

Mathematical operations on pointer values

Incrementing pointers to traverse arrays

Converting pointers to integers

Comparing pointer addresses

10. Which operator retrieves the address of a variable?

* (dereference)

& (address-of)

-> (arrow)

. (dot)

11. What is the primary purpose of the new operator in C++?

Allocate memory on the stack

Allocate memory on the heap and return a pointer

Create a new variable scope

Initialize an object without memory allocation

12. How does shared_ptr track when to delete memory?

Reference counting

Garbage collection

Manual deletion

Scope exit detection

13. What happens when a dangling pointer is dereferenced?

Compilation error

Undefined behavior

Automatic null assignment

Memory reallocation

14. Which smart pointer allows multiple pointers to share ownership?

Unique_ptr

Auto_ptr

Shared_ptr

Weak_ptr

15. What is the difference between new and malloc in C++?

New calls constructors; malloc does not

Malloc is faster than new

New only works with classes

They are functionally identical

16. How many pointers can own a single object when using unique_ptr?

Zero

One

Multiple

Unlimited

17. What is a memory leak in C++?

Accessing memory after deletion

Allocated memory that is never freed

Pointer arithmetic overflow

Stack overflow from recursion

18. Which function deallocates memory previously allocated with new?

Remove()

Free()

Delete

Deallocate()

19. What does RAII stand for in C++ memory management?

Resource Allocation Is Initialization

Resource Allocation In Inheritance

Rapid Allocation and Instantiation Idiom

Reference Allocation in Implementation

20. Which smart pointer automatically deletes memory when it goes out of scope?

Raw pointer