Object-Oriented Programming (OOP) is a programming approach that organizes code around objects rather than just functions and logic.
C++ supports OOP features that allow building programs that are modular, reusable, and easier to manage.
Why Use OOP?
- Groups data and behavior together
- Promotes code reuse through inheritance
- Makes large codebases easier to maintain and scale
- Encourages logical structuring of complex systems
Key Concepts of OOP in C++
| Concept | Description |
|---|
| Class | Blueprint for creating objects (data + functions) |
| Object | Instance of a class with its own data |
| Encapsulation | Binding data and methods together in one unit |
| Abstraction | Hiding internal details and showing only essential features |
| Inheritance | Reusing properties and behaviors from another class |
| Polymorphism | Ability to take many forms (function or operator overloading) |
Example: Class and Object
#include <iostream>
using namespace std;
class Car {
public:
string brand;
void start() {
cout << brand << " is starting...\n";
}
};
int main() {
Car c1;
c1.brand = "Toyota";
c1.start();
return 0;
}
Benefits of OOP in C++
| Benefit | Impact |
|---|
| Modularity | Easy to divide work into components |
| Reusability | Write once, reuse multiple times |
| Maintainability | Easier to fix and update code |
| Scalability | Efficiently manage large applications |
| Security | Control access to data using access specifiers |
Access Specifiers
| Specifier | Access Level |
|---|
public | Accessible from anywhere |
private | Accessible only within the class |
protected | Accessible in the class and derived classes |
