Day 16 : Python program to check whether a number is strong number

 

import math

def is_strong_number(number):

    sum_of_factorials = sum([math.factorial(int(digit)) for digit in str(number)])

    return sum_of_factorials == number

# Input from user

num = int(input("Enter a number: "))

if is_strong_number(num):

    print(f"{num} is a strong number.")

else:

    print(f"{num} is not a strong number.")

Code Explanation: 

Importing the Math Library

import math

import math: Brings the math library into the program, giving access to mathematical functions like math.factorial().

2. Defining the Function

def is_strong_number(number):

def: Declares a new function.

is_strong_number: The name of the function, which determines if a given number is a strong number.

number: The input parameter for the function, representing the number to check.

3. Calculating the Sum of Factorials of Digits

    sum_of_factorials = sum([math.factorial(int(digit)) for digit in str(number)])

str(number): Converts the number into a string so that we can loop through its digits.

int(digit): Converts each digit (originally a string) back to an integer.

math.factorial(int(digit)): Calculates the factorial of the digit.

sum([...]): Calculates the sum of the list.

sum_of_factorials: Stores the result of this calculation.

4. Checking if the Number is a Strong Number

   return sum_of_factorials == number

sum_of_factorials == number: Compares the sum of the factorials of the digits to the original number.

If they are equal, the number is a strong number.

Returns True if the number is strong; otherwise, returns False.

5. Taking Input from the User

num = int(input("Enter a number: "))

input("Enter a number: "): Displays a prompt and takes input from the user as a string.

int(): Converts the string input to an integer.

num: Stores the user-provided number.

6. Checking and Printing the Result

if is_strong_number(num):

    print(f"{num} is a strong number.")

else:

    print(f"{num} is not a strong number.")

if is_strong_number(num):: Calls the is_strong_number function with the user’s input (num).

If the function returns True, it means num is a strong number.

If it returns False, num is not a strong number.

print(f"..."): Displays the result to the user using an f-string.

   #source code --> clcoding.com