CPP Advanced C Plus Plus Classes Quiz

Submit

2. What is the correct way to initialize base class members in a derived class constructor?

Using the initializer list with base class name

Calling the base constructor explicitly in the body

Using the 'super' keyword

Automatic initialization by the compiler

Submit

4. What is the role of a virtual destructor in a base class used polymorphically?

Ensures derived class destructors are called when deleting via base pointer

Prevents the class from being inherited

Makes all member functions virtual automatically

Allocates memory for virtual functions

Submit

6. Which statement about static member variables is correct?

Each object instance has its own copy

Static members are shared across all instances of a class

Static members must be initialized in the constructor

Static members cannot be accessed outside the class

7. What does the 'explicit' keyword do when applied to a constructor?

Prevents implicit type conversion using that constructor

Makes the constructor public

Allows the constructor to call other constructors

Forces the constructor to initialize all members

Submit

9. In multiple inheritance, what problem can occur when base classes share a common ancestor?

Diamond problem

Circular inheritance

Ambiguous resolution

Memory overflow

10. What is the 'this' pointer in C++?

A pointer to the current object instance

A static pointer to the class

A reference to the parent class

A null pointer used for error handling

11. What is the primary difference between a class and a struct in C++?

Classes support inheritance; structs do not

Classes default to private members; structs default to public

Structs cannot have member functions

Classes are stack-allocated; structs are heap-allocated

12. Which of the following is true about the copy constructor?

It is always called when passing objects by value

It cannot be declared as explicit

It takes a reference to the same class as parameter

Both a and c

13. What is the difference between deep copy and shallow copy in classes?

Deep copy duplicates data; shallow copy shares pointers

Shallow copy is faster but unsafe for dynamic memory

Deep copy allocates new memory; shallow copies reference existing memory

All of the above

Submit

15. What is the purpose of the 'const' qualifier on a member function?

Prevents the function from modifying member variables

Makes the function static

Allows the function to access private members

Requires the function to return a constant value

16. When a destructor is declared as virtual, what happens in derived classes?

Derived destructors are automatically called before base destructors

Only the base destructor executes

Derived destructors execute first, ensuring proper cleanup

Virtual destructors prevent derived class destruction

17. What is the order of constructor calls in multiple inheritance?

Base classes in declaration order, then derived class

Derived class first, then base classes in reverse order

All constructors simultaneously

Base classes in alphabetical order

18. Which access specifier allows access only within the class and derived classes?

Public

Protected

Private

Friend

19. In C++, what is the correct syntax for a pure virtual function in a base class?

Virtual void function() = 0;

Abstract void function();

Virtual void function() {};

Void function() override;

CPP Advanced C Plus Plus Classes Quiz

1. A class with at least one pure virtual function is called an ____ class.

2.

What first name or nickname would you like us to use?

2. What is the correct way to initialize base class members in a derived class constructor?

3. In C++, ____ allows a derived class to change the signature of a virtual function from the base class.

4. What is the role of a virtual destructor in a base class used polymorphically?

5. A ____ function is a non-member function declared as a friend of a class to access private members.

6. Which statement about static member variables is correct?

7. What does the 'explicit' keyword do when applied to a constructor?

8. The ____ keyword is used to inherit from a base class privately in C++.

9. In multiple inheritance, what problem can occur when base classes share a common ancestor?

10. What is the 'this' pointer in C++?

11. What is the primary difference between a class and a struct in C++?

12. Which of the following is true about the copy constructor?

13. What is the difference between deep copy and shallow copy in classes?

14. In C++, operator overloading cannot be applied to the ____ operator.

15. What is the purpose of the 'const' qualifier on a member function?

16. When a destructor is declared as virtual, what happens in derived classes?

17. What is the order of constructor calls in multiple inheritance?

18. Which access specifier allows access only within the class and derived classes?

19. In C++, what is the correct syntax for a pure virtual function in a base class?