Is it mandatory to override virtual function?

Is it mandatory to override virtual function?

It is not mandatory for the derived class to override (or re-define the virtual function), in that case, the base class version of the function is used.

Can a virtual function be overridden?

Virtual functions are member functions whose behavior can be overridden in derived classes. As opposed to non-virtual functions, the overriding behavior is preserved even if there is no compile-time information about the actual type of the class.

Is it necessary to override a virtual method in C #?

Yes, you need to use the override keyword, otherwise the method will be hidden by the definition in the derived class.

Do I have to implement virtual method?

Yes, that’s fine you only need to implement any pure virtual functions in order to instantiate a class derived from an abstract base class. Show activity on this post. Yes, Its correct that a Derived class has to OVERRIDE the function which is Pure Virtual in the Parent Class.

What is the difference between virtual function and function overriding?

Because virtual functions are called only for objects of class types, you cannot declare global or static functions as virtual . The virtual keyword can be used when declaring overriding functions in a derived class, but it is unnecessary; overrides of virtual functions are always virtual.

How do you override a function?

Access Overridden Function in C++ To access the overridden function of the base class, we use the scope resolution operator :: . We can also access the overridden function by using a pointer of the base class to point to an object of the derived class and then calling the function from that pointer.

What is must condition for virtual function to achieve runtime polymorphism?

pointer or reference
Which is a must condition for virtual function to achieve runtime polymorphism? Explanation: The virtual functions must be called using pointer or reference. This is mandatory so that the intended function gets executed while resolving the method at runtime.

What happens when we call virtual function in non-virtual function?

So polymorphic behaviour works even when a virtual function is called inside a non-virtual function. The output can be guessed from the fact that the function to be called is decided at run-time using the vptr and vtable.

Is it mandatory to override abstract method in derived class C#?

When the derived class inherits the abstract method from the abstract class, it must override the abstract method. This requirment is enforced at compile time and is also called dynamic polymorphism.

Why is virtual function necessary?

Why use virtual functions. We use virtual functions to ensure that the correct function is called for an object, regardless of the reference type used to call the function. They are basically used to achieve the runtime polymorphism and are declared in the base class by using the virtual keyword before the function.