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