✅ Definition:

Abstraction ka matlab hai:

User ko sirf important details dikhana aur baaki complexity chhupa lena.

📌 “Kya kaam kar raha hai” batana, lekin “kaise kar raha hai” chhupana = Abstraction

🧠 Real-Life Example:

Real Life Abstraction
Car ka steering ghumao, car turn karti hai – tumhe internal engine ka kaam nahi pata. Tum function call karte ho, andar ka logic nahi dikhai deta

🔧 C++ Example:

cpp
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#include<iostream>
using namespace std;

class ATM {
  public:
    void withdrawMoney() {
        cout << "Amount Withdrawn Successfully!" << endl;
    }

    void checkBalance() {
        cout << "Your balance is ₹10,000" << endl;
    }

  private:
    void internalBankServer() {
        // complex logic: authentication, server comm, etc.
    }
};

🔹 Use:

cpp
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int main() {
    ATM user;
    user.withdrawMoney();     // ✅ allowed
    user.checkBalance();      // ✅ allowed
    // user.internalBankServer(); ❌ Not allowed (private)
}

🧱 How to Implement Abstraction:

Step Description
Use private Jo part user ko nahi dekhna chahiye
Use public functions Sirf jo use karna chahte ho wo expose karo
Use Abstract Class (Advanced) – Base class with pure virtual functions

🔁 Abstraction vs Encapsulation:

Feature Abstraction Encapsulation
Focus Hide implementation details Bind data + methods together
Purpose Simplicity for user Security & access control
Achieved by Access specifiers + abstract classes Class with private data & public methods
Real World ATM Machine (dikhai sirf buttons) Mobile (andar hardware + software)

🔧 Advance: Abstract Class Example

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

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