Python Coding challenge - Day 845| What is the output of the following Python Code?

Code Explanation:

1. Defining the Class

class Math:

This line defines a class called Math.

A class is a blueprint for creating objects.

All methods related to mathematical operations can go inside this class.

2. Defining the Method

def fact(self, n):

Defines a method called fact to calculate the factorial of a number n.

self refers to the instance of the class that will call this method.

3. Initializing the Result Variable

res = 1

Initializes a variable res to 1.

This variable will store the factorial as it is computed in the loop.

4. Loop to Compute Factorial

for i in range(1, n+1):

    res *= i

range(1, n+1) generates numbers from 1 to n inclusive.

On each iteration, res *= i multiplies the current value of res by i.

Let’s trace it for n = 4:

Iteration i res calculation res after iteration

1 1 1 * 1 1

2 2 1 * 2 2

3 3 2 * 3 6

4 4 6 * 4 24

5. Returning the Result

return res

After the loop, res holds the factorial of n.

return res sends this value back to the caller.

6. Creating an Object

m = Math()

Creates an instance m of the class Math.

This object can now access the fact method.

7. Calling the Method and Printing

print(m.fact(4))

Calls fact(4) on object m.

Computes 4! = 1*2*3*4 = 24.

print() outputs the result to the console.

Final Output

24

500 Days Python Coding Challenges with Explanation