OBJECT ORIENTSDED PROGRAMMIN

 

OOPS IN C++

 

1. Introduction to OOPS in C++

Object-Oriented Programming System (OOPS) is a programming paradigm that organizes software design around objects rather than logic and function

Oops and developers in C++

• Organize code efficiently
• Reuse code
• Increase security
• Reduce complexity
• Make programs scalable

C++ supports both procedural programming and object-oriented programming, but OOPS makes large-scale software development easier and more manageable.

2. what is a Class in C++?

class is a blueprint or template used to create objects.

It defines:

• Data (variables)
• Functions (methods)

Example:

class Student {
public:
    string name;
    int age;

    void display() {
        Cout << name << " " << age;
    }
};

Explanation:

• class Student → Defines a class.
• public → Access specifier.
• name and age → Data members.
• display() → function of the member.

A class does not occupy memory until an object is created.

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3. What is an Object in C++?

An object is an instance of a class.

It represents a real-world entity and occupies memory.

Example:

Student s1;
s1.name = "Minhaj ANSARI";
s1.age = 20;
s1.display();

Explanation:

• s1 is an object of class Student.
• We access data using the dot (.) operator.

__ A class is a blueprint, and an object is the actual building.

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4. The Four Pillars of OOPS in C++

OOPS is based on four main concepts:

1. Encapsulation
2. Abstraction
3. Inheritance
4. Polymorphism

Let’s understand each one clearly.

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5. Encapsulation in C++

Encapsulation means binding data and functions together in a single unit (class) and restricting direct access to data.

It is achieved using:

• Access specifiers (private, public, protected)
• Getter and Setter functions

Example:

class Bank Account {
private:
    int balance;

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

    int get Balance () {
        return balance;
    }
};

Explanation:

• balance is private → Cannot access directly.
• Set Balance () and get Balance () control access.
• This increases security.

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6. Abstraction in C++

Abstraction means hiding internal details and showing only essential features.

Example:
When you drive a car, you don’t know how the engine works internally. You just use the steering and pedals.

In C++, abstraction is achieved using:

• Classes
• Abstract classes
• Pure virtual functions

Example:

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

This makes Shape an abstract class.

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7. Inheritance in C++

Inheritance allows one class to acquire properties and behavior of another class.

It promotes code reusability.

Types of Inheritance:

• Single
• Multiple
• Multilevel
• Hierarchical
• Hybrid

Example:

class Animal {
public:
    void eat () {
        Cout << "Eating";
    }
};

class Dog : public Animal {
public:
    void bark() {
        Cout << "Barking";
    }
};

Example:

• Dog inherits from Animal.
• Dog can use eat() function.

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8. Polymorphism in C++

Many forms are a sign of polymorphism.

It enables a single function to act differently in various contexts.

Types:

Polymorphism at compile time (function overloading)

Polymorphism at Runtime (Function Overriding)

Example of Function Overloading: int add(int a, int b) { return a + b; }

double add(double a, double b) returns a + b;

Different parameters but the same function name.

As an example of overriding a function, consider class Parent {public: virtual void display() { cout << "Parent class"; }};

class Child: public Parent { public: void show() { Cout << "Child class"; } };

Here, the parent function is superseded by the child class.

9.contructor in C++

A constructor is a special function that is automatically called when an object is created.

Example:

class Student {
public:
    Student () {
        Cout << "Constructor Called";
    }
};

Types of Constructors:

• Default Constructor
• Parameterized Constructor
• Copy Constructor

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10. Destructor in C++

A destructor is called automatically when an object is destroyed.

It is used to free resources.

Example:

~Student () {
    Cout << "Destructor Called";
}

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 11. Advantages of OOPS in C++

• Code Reusability
• Data Security
• Easy Maintenance
• Modular Programming
• Flexibility

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12. Conclusion

OOPS in C++ is a powerful programming approach that helps in building secure, reusable, and scalable software applications.

By understanding:

• Class & Object
• Encapsulation
• Abstraction
• Inheritance
• Polymorphism

You can write clean and professional C++ programs.

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