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C++ program to demonstrate example of multilevel inheritance

Learn about multilevel inheritance in C++, and implement multilevel inheritance using a C++ program.
[Last updated : March 02, 2023]

Multilevel Inheritance in C++

In C++, the multilevel inheritance is defined as the inheritance in which one class inherits another class which is further inherited by another class.

This program will demonstrate example of multilevel inheritance in c++ programming language.

Multilevel Inheritance Program in C++

// C++ program to demonstrate example of
// multilevel inheritance

#include <iostream>
using namespace std;

// Base Class : class A
class A {
private:
    int a;

public:
    void get_a(int val_a)
    {
        a = val_a;
    }

    void disp_a(void)
    {
        cout << "Value of a: " << a << endl;
    }
};

// Here Class B is base class for class C
// and Derived class for class A
class B : public A {
private:
    int b;

public:
    // assign value of a from here
    void get_b(int val_a, int val_b)
    {
        // assign value of a by calling function of class A
        get_a(val_a);
        b = val_b;
    }

    void disp_b(void)
    {
        // display value of a
        disp_a();
        cout << "Value of b: " << b << endl;
    }
};

// Here, class C is derived class and B is Base class
class C : public B {
private:
    int c;

public:
    // assign value of a from here
    void get_c(int val_a, int val_b, int val_c)
    {
        // Multilevel Inheritance
        // assign value of a, bby calling function of class B and Class A
        // here Class A is inherited on Class B, and Class B in inherited on Class B
        get_b(val_a, val_b);
        c = val_c;
    }

    void disp_c(void)
    {
        // display value of a and b using disp_b()
        disp_b();
        cout << "Value of c: " << c << endl;
    }
};

int main()
{
    // create object of final class, which is Class C
    C objC;

    objC.get_c(10, 20, 30);
    objC.disp_c();

    return 0;
}

Output

Value of a: 10
Value of b: 20
Value of c: 30