Object-Oriented Programming (OOP) in C++

 Object-Oriented Programming (OOP) in C++

Object-oriented programming (OOP) is a programming paradigm that revolves around the concept of objects, which can contain data and code to manipulate that data. In C++, objects are created from classes, which define the properties and behavior of the objects. Here's an example of a simple class in C++:

c++

#include <iostream>

class Rectangle {

  private:

    int width;

    int height;

  public:

    Rectangle(int w, int h) {

      width = w;

      height = h;

    }

    int area() {

      return width * height;

    }

};

int main() {

  Rectangle r(4, 5);

  std::cout << "Area of rectangle is: " << r.area() << std::endl;

  return 0;

}

In this example, we've defined a Rectangle class with two private member variables, width and height, and two public member functions, a constructor and an area function. The constructor initializes the width and height variables, and the area function returns the area of the rectangle. In the main function, we create a Rectangle object r with a width of 4 and a height of 5, and then call the area function on that object to print out the area of the rectangle.