Function overriding in C++ - Mini Project: Build & Apply

Function overriding

📖 Scenario: Imagine you have a base class Animal that can make a sound. Different animals make different sounds. We want to show how a derived class can change the sound by overriding the base class function.

🎯 Goal: Build a simple C++ program that demonstrates function overriding by creating a base class Animal with a makeSound() function, and a derived class Dog that overrides makeSound() to show a different sound.

📋 What You'll Learn

Create a base class called Animal with a public function makeSound() that prints "Some generic animal sound".

Create a derived class called Dog that inherits from Animal.

Override the makeSound() function in Dog to print "Woof!".

Create an object of Dog and call its makeSound() function to show the overridden behavior.

💡 Why This Matters

🌍 Real World

Function overriding is used in software to allow different objects to behave differently while sharing the same interface. For example, different animals making different sounds in a zoo simulation.

💼 Career

Understanding function overriding is essential for object-oriented programming jobs, especially when working with inheritance and polymorphism in C++.

1

Create the base class Animal with makeSound()

Write a class called Animal with a public function makeSound() that prints exactly "Some generic animal sound" followed by a newline.

C++

// Your code here

Need a hint?

Use class Animal and define void makeSound() inside it. Use std::cout to print the text.

2

Create the derived class Dog that inherits Animal

Add a class called Dog that publicly inherits from Animal. Do not add any functions yet.

C++

#include 

class Animal {
public:
    void makeSound() {
        std::cout << "Some generic animal sound" << std::endl;
    }
};

// Your code here

Need a hint?

Use class Dog : public Animal to create the derived class.

3

Override makeSound() in Dog to print "Woof!"

Inside the Dog class, override the makeSound() function to print exactly "Woof!" followed by a newline.

C++

#include 

class Animal {
public:
    void makeSound() {
        std::cout << "Some generic animal sound" << std::endl;
    }
};

class Dog : public Animal {
    // Your code here
};

Need a hint?

Define void makeSound() inside Dog and print "Woof!" using std::cout.

4

Create Dog object and call makeSound()

In the main() function, create an object called myDog of type Dog and call its makeSound() function.

C++

#include 

class Animal {
public:
    void makeSound() {
        std::cout << "Some generic animal sound" << std::endl;
    }
};

class Dog : public Animal {
public:
    void makeSound() {
        std::cout << "Woof!" << std::endl;
    }
};

int main() {
    // Your code here
    return 0;
}

Need a hint?

Create Dog myDog; and call myDog.makeSound(); inside main().