C++ Advanced Quiz

1. What is the purpose of a virtual function in C++?

a) To optimize code

b) To enable polymorphism

c) To make functions private

d) To reduce memory usage

2. What does `delete` do in `delete ptr;`?

a) Deletes a variable

b) Frees dynamically allocated memory

c) Resets ptr to 0

d) Deletes the pointer

3. True or False: A pure virtual function must be implemented in the base class.

a) True

b) False

4. What is the output of `template T add(T a, T b) { return a + b; } cout << add(3, 4);`?

a) 7

b) Error

c) 34

d) Undefined

5. What is a smart pointer?

a) A pointer to a class

b) A pointer that manages memory automatically

c) A constant pointer

d) A pointer to a function

6. What does `override` keyword ensure?

a) Function is virtual

b) Function overrides a base class virtual function

c) Function is private

d) Function is static

7. What is the output of `class A { public: A() { cout << "A"; } }; A a;`?

a) Nothing

b) A

c) Error

d) Undefined

8. True or False: RAII manages resource lifetime in C++.

a) True

b) False

9. What is `std::move` used for?

a) Copying objects

b) Enabling move semantics

c) Deleting objects

d) Locking resources

10. What happens if a destructor is not virtual in a base class?

a) Compilation error

b) Derived class destructor not called

c) No effect

d) Program crashes