Write a C++ program using multilevel inheritance to create a class hierarchy where Student contains the roll number, Test contains marks in two subjects, and Result displays the total marks.

#include <iostream>
using namespace std;
// Base class
class Student {
protected:
int rollNo;
public:
void getRollNo(int r) {
rollNo = r;
}
void displayRollNo() {
cout << "Roll Number: " << rollNo << endl;
}
};
// Derived from Student
class Test : public Student {
protected:
float marks1, marks2;
public:
void getMarks(float m1, float m2) {
marks1 = m1;
marks2 = m2;
}
void displayMarks() {
cout << "Marks 1: " << marks1 << ", Marks 2: " << marks2 << endl;
}
};
// Derived from Test
class Result: public Test {
public:
void displayResult() {
displayRollNo();
displayMarks();
cout << "Total Marks: " << (marks1 + marks2) << endl;
}
};
int main() {
Result r1;
r1.getRollNo(101);
r1.getMarks(85.5, 90);
r1.displayResult();
return 0;
}

Create a multilevel inheritance example in C++ where Person contains a name and age, Employee contains an employee ID, and Manager contains a department. Display all information.

#include <iostream>
using namespace std;
// Base class
class Person {
protected:
string name;
int age;
public:
void setPersonDetails(string n, int a) {
name = n;
age = a;
}
};
// Derived from Person
class Employee : public Person {
protected:
int empID;
public:
void setEmployeeDetails(int id) {
empID = id;
}
};
// Derived from Employee
class Manager : public Employee {
private:
string department;
public:
void setManagerDetails(string dept) {
department = dept;
}
void displayDetails() {
cout << "Name: " << name << endl;
cout << "Age: " << age << endl;
cout << "Employee ID: " << empID << endl;
cout << "Department: " << department << endl;
}
};
int main() {
Manager m;
m.setPersonDetails("Basant", 35);
m.setEmployeeDetails(1001);
m.setManagerDetails("IT");
m.displayDetails();
return 0;
}

Write a C++ program using multilevel inheritance where Animal has a method to say it is an animal, Mammal adds another message, and Human provides a specific identity.

#include <iostream>
using namespace std;
// Base class
class Animal {
public:
void identity() {
cout << "I am an animal." << endl;
}
};
// Derived from Animal
class Mammal : public Animal {
public:
void mammalIdentity() {
cout << "I am a mammal." << endl;
}
};
// Derived from Mammal
class Human : public Mammal {
public:
void humanIdentity() {
cout << "I am a human." << endl;
}
};
int main() {
Human h;
h.identity();
h.mammalIdentity();
h.humanIdentity();
return 0;
}</pre

4. Hierarchical Inheritance

Hierarchical inheritance is a type of inheritance in C++ where multiple derived (child) classes inherit from a single base (parent) class.

In hierarchical inheritance, many child classes come from one parent class. For example, both cars and buses come from the vehicle class.”