Multilevel Inheritance

Multilevel inheritance typically means that a class can be derived from a derived class during a C++ program. Therefore, the derived class inherits from a class, which in turn inherits from another class. Hence, the superclass for one is a sub-class for another. 

Syntax:

class A
{ .... ... .... };
class B : public A
{ .... ... .... };
class C : public B
{ .... ... .... };

Example:

#include <iostream>

class A
{
    public:
      void display()
      {
          cout<<"Base class content.";
      }
};

class B : public A
{

};

class C : public B
{
 
};

void main()
{
    C c;
    c.display();
   getch();
}

From the example above, class B is derived from A, while class C is derived from B. However, an object of class C is defined in the main() function. 

• When the display() function is called, display() in class A is executed because there is no display() function in class B and class C. 
• However, the program initially looked for display() in class C first, but couldn't find it. 
• Next, it looked in class B because class C is derived from B, but couldn’t find it again. and
• It finally looked in A and executes the codes inside the function.