C++ “virtual” keyword for functions in derived classes. Is it necessary?

Question

With the struct definition given below...

struct A {
    virtual void hello() = 0;
};

Approach #1:

struct B : public A {
           


        

Answer 1

I will certainly include the Virtual keyword for the child class, because

• i. Readability.
• ii. This child class my be derived further down, you don't want the constructor of the further derived class to call this virtual function.