Free Test Smart pointers introdu... – C++ Lan...

Q1: What is a smart pointer in C++?

A. An object that manages the lifetime of a dynamically allocated object B. A raw pointer C. A pointer to a smart device D. A special hardware pointer

Q2: Which header file is required to use smart pointers?

A. <memory> B. <pointer> C. <smart> D. <iostream>

Q3: Which of the following is NOT a standard smart pointer?

A. unique_ptr B. shared_ptr C. weak_ptr D. fast_ptr

Q4: What is the main feature of unique_ptr?

A. Exclusive ownership of the object B. Shared ownership of the object C. Weak reference to the object D. Pointer to multiple objects

Q5: Which smart pointer allows multiple owners?

A. shared_ptr B. unique_ptr C. weak_ptr D. auto_ptr

Q6: What is the purpose of weak_ptr?

A. To break circular references by providing a non-owning reference B. To own an object uniquely C. To share ownership D. To allocate memory

Q7: Can unique_ptr be copied?

A. No, only moved B. Yes, it supports copy C. No, it cannot be moved D. Yes, but only between threads

Q8: How do you create a unique_ptr?

A. std::unique_ptr<int> ptr = std::make_unique<int>(10); B. int* ptr = new int(10); C. std::shared_ptr<int> ptr(new int(10)); D. auto ptr = new unique_ptr<int>(10);

Q9: Which smart pointer does not increase reference count?

A. weak_ptr B. shared_ptr C. unique_ptr D. all increase reference count

Q10: What happens when the last shared_ptr to an object is destroyed?

A. The object is deleted B. Nothing happens C. The object is reset to null D. The program crashes

Q11: Which smart pointer can be used to check if the object still exists?

A. weak_ptr B. unique_ptr C. shared_ptr D. raw pointer

Q12: What is the advantage of smart pointers over raw pointers?

A. Automatic memory management and safety B. Faster execution C. Less memory usage D. Simpler syntax

Q13: Which smart pointer type is deprecated in C++11?

A. auto_ptr B. unique_ptr C. shared_ptr D. weak_ptr

Q14: How do you access the raw pointer from a smart pointer?

A. Using get() method B. Using * operator C. Using -> operator D. Cannot access raw pointer

Q15: Can smart pointers be used with arrays?

A. unique_ptr can with new[], shared_ptr cannot by default B. shared_ptr can with new[], unique_ptr cannot C. Both can be used directly D. Neither can be used

Q16: What happens if you reset a smart pointer?

A. It releases ownership and deletes the managed object if no other owners exist B. It copies the pointer C. It allocates new memory D. It throws an error

Q17: Which smart pointer is best suited for exclusive ownership?

A. unique_ptr B. shared_ptr C. weak_ptr D. auto_ptr

Q18: Can you assign a unique_ptr to a shared_ptr?

A. No, but you can transfer ownership by moving B. Yes, directly C. No, never D. Only with special casts

Q19: What is the key difference between shared_ptr and weak_ptr?

A. shared_ptr owns the object; weak_ptr does not B. both own the object C. weak_ptr owns exclusively D. No difference

Q20: Which smart pointer type helps prevent memory leaks due to circular references?

A. weak_ptr B. unique_ptr C. shared_ptr D. auto_ptr

Quiz for Smart pointers introduction