Problem Name: Multi Level Inheritance

Problem Link:

In this HackerRank Functions in C++ programming problem solution,

This challenge is an extension of a previous challenge named Inheritance-Introduction. We highly recommend solving Inheritance-Introduction before solving this problem.

In the previous problem, we learned about inheritance and how can a derived class object use the member functions of the base class.

In this challenge, we explore multi-level inheritance. Suppose, we have a class A which is the base class and we have a class B which is derived from class A and we have a class C which is derived from class B, we can access the functions of both class A and class B by creating an object for class C. Hence, this mechanism is called multi-level inheritance. (B inherits A and C inherits B.)

Create a class called Equilateral which inherits from Isosceles and should have a function such that the output is as given below.

Sample Output

I am an equilateral triangle
I am an isosceles triangle
I am a triangle



Code Examples

#1 Code Example with C++ Programming

Code - C++ Programming

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

class Triangle{
      void triangle(){
         cout << "I am a triangle" << endl;

class Isosceles : public Triangle{
        void isosceles(){
          cout << "I am an isosceles triangle" << endl;

class Equilateral : public Isosceles{
        void equilateral(){
            cout << "I am an equilateral triangle" << endl;

int main()
    Equilateral eqr;

    return 0;
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