Ans :
The virtual functions must be the members of some class.
A class member function can be declared to be virtual by just specifying the keyword „virtual‟ in front of the function declaration. The syntax of declaring a virtual function is as follows:
virtual <retuen type><function name><(argument list)>
{//Function Body}
Virtual Functions enables derived (sub) class to provide its own implementation for the function already defined in its base (super) class.
Virtual Functions give power to the derived class functions to override the function in its base class with the same name and signature.
Virtual Functions can‟t be static members.
Only the functions that are members of some class can be declared as virtual that means we can‟t declare regular functions or friend functions as virtual.
A virtual function can be a friend of another class.
A virtual function in a base class must be defined, even though it may not be used.
If one will call the virtual function with the pointer having the reference to the base class object then the function of the base class will be called for sure.
The corresponding functions in the derived class must agree with the virtual function’s name and signature that means both must have same name and signature.
