input: Write a function to convert a positive integer to negative or vice versa using the bitwise NOT operator. If the input is a positive integer, return its negative form; if the input is a negative integer, return its positive form. Implement the solution using Python's bitwise NOT operator.
  
  def convert_to_negative(x): 
      return ~x + 1 
    
  def convert_to_positive(x): 
      return ~(x-1)
  
  assert convert_to_negative(5) == -5
  assert convert_to_negative(10) == -10
  assert convert_to_positive(-5) == 5
  assert convert_to_positive(-10) == 10
output: def convert_to_negative(x): 
      return ~x + 1 
    
  def convert_to_positive(x): 
      return ~(x-1)