Why would one create a base class object with reference to the derived class?

They’re useful any time you want to indicate that all your code is able to operate using only the base class members, so the choice about which derived class to use is localized to the single place where you instantiate it.

What is the purpose of polymorphism in C++?

The word polymorphism means having many forms. Typically, polymorphism occurs when there is a hierarchy of classes and they are related by inheritance. C++ polymorphism means that a call to a member function will cause a different function to be executed depending on the type of object that invokes the function.

When you instantiate an object of the derived class the constructor in the base class is called before the constructor of the derived class?

Base class constructors are always called in the derived class constructors. Whenever you create derived class object, first the base class default constructor is executed and then the derived class’s constructor finishes execution. 1.

Why do we need polymorphism?

Polymorphism is considered one of the important features of Object-Oriented Programming. Polymorphism allows us to perform a single action in different ways. In other words, polymorphism allows you to define one interface and have multiple implementations.

What happens when a derived class is assigned to a reference to its base class?

Object slicing happens when a derived class object is assigned to a base class object, additional attributes of a derived class object are sliced off to form the base class object.

What is the importance of this pointer in the call to the function using base class pointer?

To understand ‘this’ pointer, it is important to know how objects look at functions and data members of a class. Each object gets its own copy of the data member. All-access the same function definition as present in the code segment.

What is dynamic binding in C++?

Dynamic binding refers to linking a procedure call to code that will execute only once. The code associated with the procedure is not known until the program is executed, which is also known as late binding.

Can we overload constructor in derived class?

Since the constructors can’t be defined in derived class, it can’t be overloaded too, in derived class. Explanation: The constructors doesn’t have any return type. When we can’t have return type of a constructor, overloading based on the return type is not possible. Hence only parameters can be different.

Does a derived class need a constructor?

In inheritance, the derived class inherits all the members(fields, methods) of the base class, but derived class cannot inherit the constructor of the base class because constructors are not the members of the class.

What is polymorphism and its advantages?

Polymorphism offers the following advantages − It helps the programmer to reuse the codes, i.e., classes once written, tested and implemented can be reused as required. Saves a lot of time. Single variable can be used to store multiple data types. Easy to debug the codes.

Why do we need polymorphism What benefit does it provide over non polymorphic code?

It allows programmers to reuse, evaluate and execute the program, modules, forms written once. In certain aspects, they can be repeated. You may use the odd variable name to stock variables of different types of data, such as Int, Float, etc.). Polymorphism tends to reduce the pairing of multiple functionalities.