Question

Which of the following is false statement, about virtual functions in C++?
1. They must be members of some class
2. They cannot be static members
3. They are accessed using object pointers.
4. They cannot be a friend of another class.

Answer 1

Correct Answer - Option 1 : They must be members of some class

A virtual function is a member function which is declared within a base class and is re-defined(Overriden) by a derived class. 

• Virtual functions ensure that the correct function is called for an object, regardless of the type of reference (or pointer) used for function call.
• Virtual functions must be members of the base class
• They are mainly used to achieve Runtime polymorphism
• Functions are declared with a virtual keyword in base class.
• The resolving of function call is done at Run-time.
• Virtual functions cannot be static and also cannot be a friend function of another class.
• Virtual functions should be accessed using pointer or reference of base class type to achieve run time polymorphism.