Solve the problem 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 we will see what multi-level inheritance is. 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. This is called Multi-Level inheritance. (B inherits A and C inherits B.)
Now create a class called Equilateral which inherits from Isosceles and should have a function such that the output is as given below.

# Multi-level inheritance problem solution in c++ programming | HackerRank

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

class Triangle{
public:
void triangle(){
cout<<"I am a triangle\n";
}
};

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

//Write your code here.
class Equilateral : public Isosceles
{
public:
void equilateral(){
cout << "I am an equilateral triangle" << endl;
}
};

int main(){

Equilateral eqr;
eqr.equilateral();
eqr.isosceles();
eqr.triangle();
return 0;
}