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Encapsulation and Abstraction

📘 C++ 👁 32 views 📅 Dec 22, 2025
⏱ Estimated reading time: 1 min

Encapsulation is the process of binding data and functions together into a single unit (class) and protecting data from direct access.

How Encapsulation is Achieved

  • Using classes

  • Using access specifiers (private, public, protected)

Example of Encapsulation

class Account {
private:
    int balance;

public:
    void setBalance(int b) {
        balance = b;
    }

    int getBalance() {
        return balance;
    }
};

  • Data (balance) is hidden

  • Access is provided through public methods

Advantages of Encapsulation

  • Improves data security

  • Enhances maintainability

  • Controls data access

  • Increases modularity

Abstraction in C++

Abstraction means hiding implementation details and showing only essential features to the user.

How Abstraction is Achieved

  • Using abstract classes

  • Using interfaces (pure virtual functions)

Example of Abstraction

class Shape {
public:
    virtual void draw() = 0;  // Pure virtual function
};

class Circle : public Shape {
public:
    void draw() {
        cout << "Drawing Circle";
    }
};

  • User knows what an object does

  • Not how it is implemented

Difference Between Encapsulation and Abstraction

EncapsulationAbstraction
Bundles data and methodsHides implementation details
Focuses on data protectionFocuses on design
Achieved using classesAchieved using abstract classes
Example: Data hidingExample: Interface

Key Points

  • Encapsulation = Data hiding

  • Abstraction = Implementation hiding

  • Both improve security and code clarity

  • Core concepts of OOP in C++

Conclusion

Encapsulation and abstraction work together in C++ to build secure, flexible, and easy-to-maintain programs.

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