Object Oriented Programming Basic Concept C

Question

As We know

The Default Modifier of Class, Struct, Delegate, Interface, and Enum is Internal.

1. Enum & Interface members by default are public.

2. And Class, Struct, and Delegate members by default are private.

3. Non-derived classes of the same class library can have access to public and internal classes (and public, internal, and protected internal members).

4. Non-derived classes of different class-library can have access to public classes (public members only).

5. Derived classes of different class-library can have access to public classes (public, protected, protected-internal members).

Now I want to understand the core concept that why is so that...

Protected members are having more scope than internal?

Answer 1

Protected access specifier allows a child class to access the member variables and member functions of its base class. This way it helps in implementing inheritance. We will discuss this in more detail in the inheritance chapter.

The following is an example showing we have set an protected member variable in Class A.

class A {
   protected int a2 = 87;
}

Now under the derived class when we will try to access the above variable from the derived class object, then it would work fine as shown below −

Example

using System;
class A {
   protected int a2 = 87;
}
class B : A {
   static void Main() {
      A a = new A();
      B b = new B();
      b.a2 = 10;
   }
}