Program 1: Report File

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Program 1: Recursively find the factorial of a natural number

def recur_factorial(n):
  if n == 1:
      return n
  else:
      return n*recur_factorial(n-1)


# take input from the user
num = int(input("Enter a number: "))
# check is the number is negative
if num < 0:
  print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
  print("The factorial of 0 is 1")
else:
  print("The factorial of",num,"is",recur_factorial(num))

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