When you declare an OBJECT of a derived class, stacks or heaps allocate the space for the object. This space contains the inherited data members from the base class and also the members defined in its derived class. The initialization of the inherited data members from the base class is done with the help of the constructor of a base class. Therefore, compiler executes the constructor function of the base class followed by the constructor function of the derived class.
When an object goes out of scope, the destructors EXECUTE in the REVERSE order of the CONSTRUCTORS. Firstly, the destructor of the derived class is invoked to destroy the derived class object, and then the destructor of a base class is invoked. This process helps to allocate the required space.

When you declare an object of a derived class, stacks or heaps allocate the space for the object. This space contains the inherited data members from the base class and also the members defined in its derived class. The initialization of the inherited data members from the base class is done with the help of the constructor of a base class. Therefore, compiler executes the constructor function of the base class followed by the constructor function of the derived class.
When an object goes out of scope, the destructors execute in the reverse order of the constructors. Firstly, the destructor of the derived class is invoked to destroy the derived class object, and then the destructor of a base class is invoked. This process helps to allocate the required space.