Classes and Objects in C++ Tutorial with Example

Introduction

In C++, classes and objects form the backbone of Object-Oriented Programming (OOP). They allow programmers to model real-world entities in code. This tutorial uses a Developer–Company example to explain classes and objects in a beginner-friendly way.

What is a Class?

A class is a blueprint that defines the attributes (data members) and behaviors (methods) of an object.

👉 Example: A Developer class can have attributes like name, skills, and salary, and methods like work() or getSalary().

Example – Developer Class in C++

#include <iostream>
using namespace std;

// Define a Developer class
class Developer {
public:
    string name;
    string skills;
    double salary;

    void work() {
        cout << name << " is coding using " << skills << "." << endl;
    }

    void getSalary() {
        cout << name << " earns $" << salary << " per month." << endl;
    }
};

What is an Object?

An object is an instance of a class. While a class is just a design, objects bring it to life.

If the class is the blueprint of a developer, the object is the actual developer working at a company.

Example – Company with Developer Objects

#include <iostream>
using namespace std;

class Developer {
public:
    string name;
    string skills;
    double salary;

    void work() {
        cout << name << " is coding using " << skills << "." << endl;
    }

    void getSalary() {
        cout << name << " earns $" << salary << " per month." << endl;
    }
};

int main() {
    // Creating Developer objects
    Developer dev1;
    dev1.name = "Alice";
    dev1.skills = "C++ and Python";
    dev1.salary = 7000;

    Developer dev2;
    dev2.name = "Bob";
    dev2.skills = "Java and Spring Boot";
    dev2.salary = 8000;

    // Company uses developer objects
    dev1.work();
    dev1.getSalary();

    dev2.work();
    dev2.getSalary();

    return 0;
}

Output

Alice is coding using C++ and Python.
Alice earns $7000 per month.
Bob is coding using Java and Spring Boot.
Bob earns $8000 per month.

Benefits of Classes and Objects in C++

• Encapsulation – Bundles data and functions together.

• Reusability – One class can be reused for multiple objects.

• Real-world modeling – Easily represents systems like companies and employees.

• Scalability – More features can be added without breaking existing code.

Conclusion

In this tutorial, you learned classes and objects in C++ using a Developer–Company example.

• A class defines the structure (blueprint).

• An object brings it to life.

By practicing with real-world models like developers and companies, you’ll better understand how OOP in C++ simplifies programming and system design.

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