input: 
  def convert_integer_sign(x: int) -> int:
      """
      Convert a positive integer to negative or a negative integer to positive using the bitwise NOT operator.
      
      >>> convert_integer_sign(5)
      -5
      >>> convert_integer_sign(-5)
      5
      >>> convert_integer_sign(0)
      0
      """
      if x > 0:
          return ~x + 1
      elif x < 0:
          return ~(x - 1)
      else:
          return 0
  
output:     if x > 0:
          return ~x + 1
      elif x < 0:
          return ~(x - 1)
      else:
          return 0