FAQs on C++ Programming Tutorials - Derived Class Constructors and Destructors

Question 1

1. What are derived class constructors in C++?

Accepted Answer

Ans. Derived class constructors in C++ are special member functions that are used to initialize the derived class objects. They are called when an object of the derived class is created and are responsible for initializing the inherited members from the base class.

Question 2

2. How are derived class constructors different from base class constructors in C++?

Accepted Answer

Ans. Derived class constructors are different from base class constructors in C++ as they not only initialize the derived class members but also the inherited members from the base class. They can also call the base class constructor explicitly using the initialization list.

Question 3

3. Can a derived class constructor have a different number of arguments than the base class constructor in C++?

Accepted Answer

Ans. Yes, a derived class constructor can have a different number of arguments than the base class constructor in C++. However, it is important to note that the derived class constructor must explicitly call the base class constructor in its initialization list to initialize the inherited members.

Question 4

4. What happens if the derived class constructor does not explicitly call the base class constructor in C++?

Accepted Answer

Ans. If the derived class constructor does not explicitly call the base class constructor in C++, the default constructor of the base class will be called automatically. However, if the base class does not have a default constructor and the derived class constructor does not explicitly call any other base class constructor, a compilation error will occur.

Question 5

5. Can a derived class destructor be virtual in C++?

Accepted Answer

Ans. Yes, a derived class destructor can be virtual in C++. When the base class destructor is declared as virtual, it allows the derived class destructor to be called polymorphically when deleting a derived class object through a base class pointer. This ensures that the destructors of both the base and derived classes are called in the correct order.

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