Python Coding challenge - Day 835| What is the output of the following Python Code?

 

Code Explanation:

Importing the math module

import math

This imports Python’s built-in math module.

We need it because math.pi gives the value of π (3.14159…).

Defining the Circle class

class Circle:

This starts the definition of a class named Circle.

A class is a blueprint for creating objects.

Initializer method (constructor)

    def __init__(self, r):

        self.r = r

Explanation:

__init__ is called automatically when an object is created.

It receives r (radius).

self.r = r stores the radius in the object’s attribute r.

So, when we do Circle(5),

the object stores r = 5 inside itself.

Creating a readable property: area

    @property

    def area(self):

        return math.pi * self.r**2

Explanation:

@property decorator

Turns the method area() into a property, meaning you can access it like a variable, not a function.

area calculation

Formula used:

Area = π × r²

So:

Area = math.pi * (5)^2

     = 3.14159 * 25

     = 78.5398...

Printing the area (converted to integer)

print(int(Circle(5).area))

Breakdown:

Circle(5) → Creates a Circle with radius = 5.

.area → Gets the computed area property (≈ 78.5398).

int(...) → Converts it to an integer → 78.

print(...) → Prints 78.

Final Output

78

600 Days Python Coding Challenges with Explanation