Write a Python program to find the factorial of a number

Without Function

1. Iterative Approach

# Take input from user

try:

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

# Check if the number is negative

if number < 0:

     print("Factorial is not defined for negative numbers")

else:

     result = 1

     for i in range(1, number + 1):

         result *= i

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

except ValueError:

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

2. Recursive Approach

# Take input from user

try:

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

# Check if the number is negative

if number < 0:

     print("Factorial is not defined for negative numbers")

else:

     # Initialize the result variable

     result = 1