New entry Multilevel Inheritance

content/cpp/concepts/inheritance/terms/multilevel-inheritance/multilevel-inheritance.md

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+---
+Title: 'Multilevel Inheritance'
+Description: 'Multilevel inheritance is when a derived class inherits from another derived class, forming a parent-child-grandchild class hierarchy.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Classes'
+  - 'Inheritance'
+  - 'Objects'
+  - 'OOP'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+**Multilevel inheritance** is an [Object-Oriented Programming (OOP)](https://www.codecademy.com/resources/docs/general/programming-paradigms/object-oriented-programming) concept where a class can inherit properties and methods from a class that is already inherited from another class, forming a hierarchical class structure. This forms a parent-child-grandchild relationship between classes, enabling the creation of specialized classes from existing ones.
+
+## Syntax
+
+In C++, multilevel inheritance follows this syntax:
+
+```pseudo
+class BaseClass {
+    // Base class members
+};
+
+class DerivedClass1 : AccessSpecifier BaseClass {
+    // First level derived class members
+};
+
+class DerivedClass2 : AccessSpecifier DerivedClass1 {
+    // Second level derived class members
+};
+```
+
+## Example
+
+In the following example, multilevel inheritance is demonstrated where `Puppy` inherits from `Dog`, which in turn inherits from `Animal`, allowing `Puppy` to access methods from both `Dog` and `Animal`:
+
+```cpp
+#include <iostream>
+using namespace std;
+
+class Animal {
+public:
+    void eat() {
+        cout << "Animal is eating." << endl;
+    }
+};
+
+class Dog : public Animal {
+public:
+    void bark() {
+        cout << "Dog is barking." << endl;
+    }
+};
+
+class Puppy : public Dog {
+public:
+    void weep() {
+        cout << "Puppy is weeping." << endl;
+    }
+};
+
+int main() {
+    Puppy myPuppy;
+
+    myPuppy.eat();        // Inherited from Animal
+    myPuppy.bark();       // Inherited from Dog
+    myPuppy.weep();       // Inherited from Puppy
+
+    return 0;
+}
+```
+
+The output of the above code will be:
+
+```
+Animal is eating.
+Dog is barking.
+Puppy is weeping.
+```
+
+## Codebyte Example
+
+The following example demonstrates how multilevel inheritance allows a class to inherit features across multiple levels, forming a structured class hierarchy:
+
+```codebyte/cpp
+#include <iostream>
+#include <string>
+
+class Employee {
+protected:
+    std::string name;
+    int id;
+
+public:
+    Employee(std::string n, int i) : name(n), id(i) {}
+
+    virtual void displayInfo() {
+        std::cout << "Name: " << name << "\nID: " << id << std::endl;
+    }
+};
+
+class Developer : public Employee {
+protected:
+    std::string programmingLanguage;
+
+public:
+    Developer(std::string name, int id, std::string lang)
+        : Employee(name, id), programmingLanguage(lang) {}
+
+    void displayInfo() override {
+        Employee::displayInfo();
+        std::cout << "Role: Developer\n";
+        std::cout << "Programming Language: " << programmingLanguage << std::endl;
+    }
+};
+
+class SeniorDeveloper : public Developer {
+private:
+    int teamSize;
+    std::string projectName;
+
+public:
+    SeniorDeveloper(std::string name, int id, std::string lang,
+                    int team, std::string project)
+        : Developer(name, id, lang), teamSize(team), projectName(project) {}
+
+    void displayInfo() override {
+        Developer::displayInfo();
+        std::cout << "Position: Senior Developer\n";
+        std::cout << "Team Size: " << teamSize << "\n";
+        std::cout << "Current Project: " << projectName << std::endl;
+    }
+};
+
+int main() {
+    SeniorDeveloper lead("Alice Johnson", 1001, "C++", 5, "Payment Gateway");
+    lead.displayInfo();
+    return 0;
+}
+```