Grading Guide for Assignment 6
Correctness:

1. General:
	c1a: doesn't compile, or throw exceptions, or no submitted file, or only submit class file...
	c1b: use completely different code for "PuzzleAsArray" and "PuzzleAsString". 
	     or do not use interface "IPuzzle" at all.
		(Attention: this does not count when you first calculate the score. 
		But if the student get this error code, minus 1 from the final score)
	c1c: display an initial state of the puzzle when you type "java PlayPuzzle"
	c1d: display an initial state of the puzzle(3X3) when you type "java PlayPuzzle array 0 3"
	c1e: display an initial state of the puzzle(3X3) when you type "java PlayPuzzle string 0 3"
	c1f: display an initial state of the puzzle(2X2) when you type "java PlayPuzzle array 0 2"
	c1g: display error message when you run "java PlayPuzzle array 0"
	c1h: display error message when you run "java PlayPuzzle hello 0 3"
	c1i: display error message when you run "java PlayPuzzle array -1 3"
	c1j: display error message when you run "java PlayPuzzle array 0 -1"
	c1k: do not add any code to IPuzzle
	c1l: catch all(any other error not mentioned in the grading guide, add your comment!)
	c1m: ask for user input instead of taking command line arguments
		(Attention: this does not count when you first calculate the score. 
		But if the student get this error code, minus 1 from the final score)
	c1n: implement just one class (either PuzzleAsArray or PuzzleAsString)
		(Attention: this does not count when you first calculate the score.
		And if the student get this error code, do not count the error codes for the
		corresponding section, minus 2 from the final score)
	
	Note: 1. If the student treat level 0 as error case, but handle other positive level correctly, 
	      that's fine. Do not take points off for c1d, c1e, c1f

	      2. If they dectected the error case, but just did not output the error message, they
	      that's s1h: bad formating for output. Do not take points off for c1g~c1j
	
2. PuzzleAsArray
	c2a: PuzzleAsArray actually use a char array to store the puzzle
	c2b: Input "N" works when it can move in that direction
	c2c: Input "S" works when it can move in that direction
	c2d: Input "W" works when it can move in that direction
	c2e: Input "E" works when it can move in that direction
	c2f: Input "Q" will quit the game.
	c2g: Input "R" will reset the game.
	c2h: Input "?" display help infomation
	c2i: error message for illegal input
	c2j: should not be case sensitive
	c2k: run "java PlayPuzzle array 1 3", then type "A", it solve the puzzle.
	c2l: run "java PlayPuzzle array 1 3", then make 3 moves(not reach the solving state) 
	     then type "A", it solve the puzzle.
	c2m: quit the game if the puzzle is solved
	c2n: has brief pause when solve the puzzle automatically

3. PuzzleAsString
	c3a: PuzzleAsString actually use a string(or string buffer) to store the puzzle
	c3b: Input "N" works when it can move in that direction
	c3c: Input "S" works when it can move in that direction
	c3d: Input "W" works when it can move in that direction
	c3e: Input "E" works when it can move in that direction
	c3f: Input "Q" will quit the game.
	c3g: Input "R" will reset the game.
	c3h: Input "?" display help infomation
	c3i: error message for illegal input
	c3j: should not be case sensitive
	c3k: run "java PlayPuzzle string 1 3", then type "A", it solve the puzzle.
	c3l: run "java PlayPuzzle string 1 3", then make 3 moves(not reach the solving state) 
	     then type "A", it solve the puzzle.
	c3m: quit the game if the puzzle is solved
	c3n: has brief pause when solve the puzzle automatically




Style:
	s1a: have the message "Input [NSEW QRA?]"
	s1b: Press "?" should not quit the game after display error message
	s1c: redundant code;
	s1d: bad formatting for code style;
	s1e: no comments, or bad comments;
	s1f: no header or bad header;
	s1g: bad file name;
	s1h: bad formatting for output;
	s1i: using break in the loop; if they do it for every loops, treat it as one mistake

Bonus:
	20 points: Include class PuzzleAsInt, using an integer representation of a Puzzle.
	   The command-line will accept int to choose this Puzzle type.
	20 points: Write another program PuzzleGUI.java that uses a GUI to play the
	   game using the array representation of the Puzzle. Include several buttons that
 	   provide flexibility to the user for a variety of modes.
	20 points: Animate the solution process in your GUI.
	20 points: Allow the user to upload a figure, which is divided into the tiles 
	   instead of using numbers.
	20 points: Bonus-bonus points! If you do all 80 bonus points completely, you will
	   receive another 20 bonus points.   


Style:

_________________
 Points |   C	|
________ _______ 
  5	|  0-1	|
________ _______ 
  4	|   2   | 
________ _______ 
  3	|  3-4  |	
________ ________ 
  2	|  5-6  |	
________ ________ 
  1	|  7-8  |	
________ ________ 
  0	|   9   |	
________ ________ 

Correctness:

_________________
 Points |   C	|
________ _______ 
  5	|  0-3	|
________ _______ 
  4	|  4-8  | 
________ _______ 
  3	|  9-13 |	
________ ________ 
  2	| 14-20 |	
________ ________ 
  1	| 21-26 |	
________ ________ 
  0	|   27+ |	
________ ________ 

c1a: do not grade, just give 0
c1b: -1 from total grade
c1m: -1 from total grade
c1n: -2 from total grade, do not count the error codes for the corresponding section