Question

Write a program to create a class Circle. Perform the following operations on it.
a. Define the attribute radius.
b. Define the constructor with one argument containing radius.
c. Define the method named get_radius() which returns the radius of the circle.
d. Define the method named calc_area() which returns the area of the circle.

Answer 1

Explanation:

Python

Object Oriented Programming (OOP)

Answer 2

Answer:

#include <iostream>

using namespace std;

class Circle{

   private:

   double radius;

   public:

   Circle(double r = 5.1){

       radius = r;

  }

  double get_radius() {  

     return radius;

  }

   double calc_area() {    

     return radius*radius*3.14;

  }

};

int main() {

   Circle c1(2.5);

    cout << "Radius=" << c1.get_radius()<<endl;

    cout << "Area=" << c1.calc_area();

   return 0;

}

Explanation:

• A class Circle is created having radius as the private variable.
• The constructor which has the same name as the class name is declared as a public variable.
• The constructor takes the radius as the argument.
• The get_radius() method returns the entered value of the radius. If no value is specified, the default value, i.e., 5.1 is returned.
• The method calc_area() calculated the area and returns the value.
• In the main function, an instance of circle class is created with radius = 2.5 as the argument.
• The get_radius() method is called and the value of the radius is printed.
• The calc_area() method is called and the value of the area is printed.

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