input: Write a function that takes an integer as input and prints the factorial of the given integer.
  
  def factorial(num):
      if num <= 1:
          return 1
      else:
          return num * factorial(num - 1)
  
  n = int(input("Enter a number: "))  
  print("Factorial of", n, "is", factorial(n))
  
  assert factorial(5) == 120
  assert factorial(0) == 1
  assert factorial(1) == 1
  assert factorial(3) == 6
  assert factorial(4) == 24
output: def factorial(num):
      if num <= 1:
          return 1
      else:
          return num * factorial(num - 1)