Write a Python program to find the factorial of a number using recursion 

With Function

# Function to calculate factorial of a number

def factorial(n):

"""

This function returns the factorial of a given number n.

Factorial of n (n!) is the product of all positive integers less than or equal to n.

"""

if n == 0 or n == 1:

     return 1

else:

     return n * factorial(n - 1)

# Example usage

number = 5  # You can change this number to test other values

result = factorial(number)

result

Write a Python program to find the factorial of a number using Iterative approach

# Function to calculate factorial of a number iteratively

def factorial_iterative(n):

"""

This function returns the factorial of a given number n using an iterative approach.

Factorial of n (n!) is the product of all positive integers less than or equal to n.

"""

if n < 0:

     return "Factorial is not defined for negative numbers"

result = 1

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

     result *= i

return result

# Example usage

number = 5  # You can change this number to test other values

result = factorial_iterative(number)

result

 # Function to calculate factorial of a number iteratively and read number from user

def factorial_iterative(n):

"""

This function returns the factorial of a given number n using an iterative approach.

Factorial of n (n!) is the product of all positive integers less than or equal to n.

"""

if n < 0:

     return "Factorial is not defined for negative numbers"

result = 1

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

     result *= i

return result

# Take input from user

try:

number = int(input("Enter a number to calculate its factorial: "))

result = factorial_iterative(number)

print(f"The factorial of {number} is {result}.")

except ValueError:

    print("Invalid input. Please enter an integer.")