code: private void checkFor(char c, int number, String message)
  			throws LexException
  	{
  		if (ch == c)
  		{
  			rdCh();
  		} else
  		{
  			throwMessage(number, message);
  		}
  	}
docs: Check the next character is as expected. If the character is not as expected, throw the message as a
  {@link LexException}.
  
  @param c
  The expected next character.
  @param number
  The number of the error message.
  @param message
  The error message.
  @throws LexException