Grading Guide for Assignment 4



You can download SavitchIn.java from "http://www.cs.cornell.edu/courses/cs100m/2004sp/Exercises/SavitchIn.java"

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UNIVERSAL STYLE/CORRECTESS POINTS (same for all problems)
X represents problem # (i.e. 1,2,4...)

   cXa: doesn't compile, or throw exceptions, or no submitted file, or only submit class file...
   cXb: change the code we provided for Problem 1 (they only need to write functions "lhsrhs", "bisection" and "evalPileDepthEqn".)
   sXa: redundant code;
   sXb: bad formatting for code style;
   sXc: no comments, or bad comments;
   sXd: no header;
   sXx: bad file name;
   sXy: bad formatting for output;
   sXz: using break in the loop; if they do it for every loops, treat it as one mistake

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Problem 1:

// The increment = 0.01 in the solution. But the student can set their own

1. public static double lhsrhs()

Test cases 1:
   c1c: [1, 1],      LHSRHS: 3.421829999999973     EQN: 5.426759497715317E-4
   c1d: [3, -1],     LHSRHS: 3.4218299999999733    EQN: 5.426759497999534E-4
   c1e: [3, 1],      LHSRHS: 3.4218299999999933    EQN: 5.426759518747382E-4
   // Note: The value of EQN just has to be close to zero, it doesn't have to be exactly what we have above.

Test cases 2:
   c1f: [4, 1],      No solution for LHSRHS .
   c1g: [1000, -1],  No solution for LHSRHS .

User input error handling:
   c1h: [-1, ...],   wrong input, make the initial guess positive
   c1i: [4, 2],      wrong input, make the direction be either 1 or -1

2. public static double bisection()

Test cases 1:
   c1j: [1, 10],     BISECTION: 3.421833038330078   EQN: 8.572817870748928E-4
   c1k: [3, 30],     BISECTION: 3.421823501586914   EQN: -1.3020234975380518E-4
   c1l: [1, 1e70],   BISECTION: 3.4218193302071196  EQN: -5.621250429066471E-4
        If they wrote their own parsing function and cannot parse "1e70", try [1, 1000000] instead of [1, 1e70].
   // Note: The value of EQN just has to be close to zero, it doesn't have to be exactly what we have above.

Test cases 2:
   c1m: [4, 10],     No solution for BISECTION.

User input error handling:
   c1n: [-1, ...],   wrong input, make it positive
   c1o: [4, 1],      wrong input, make the second one larger than the first one

	
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Problem 2:

style
   s2e: don't put everything into one big main() method; separate the functionality into different methods.

test cases 1:
   interval=[0, 100]: (this testcase is divided into the following 3 codes...) 
       c2c1:	  input 0, tell the user it is too low;	
       c2c2:      input 100, tell the user it is too high;
       c2c3:      input 101, quit and return the answer; or input -1, quit and return the answer;

   c2d: interval=[2, 3]:   
       try 2 and 3 ... either 2 or 3 is the answer, it also return how many guesses(1 or 2) it took the user to get the right answer.

   c2e: interval=[2, 3]:   assume the answer = 3, guess 2 for three times, it should tell user "You were taking too long".

test cases 2:
   c2f: interval=[4, 0],   wrong input, make the second one larger than the first one

user interface:
   c2g: it should ask for the lowest and highest value before each play. 
	//it doesn't matter whether they ask for the lower bound first or the upper bound first.
   c2h: it should ask whether the user want to repeat the game or not after each play.
   c2i: program malfunction when user repeat the game (one possible reason is that they don't reset the variable count)

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Problem 1 worth 3 correctness points, Problem 2 worth 2 correctness points. Style worth 5 points. 
If they submit on time, give them 5 BONUS points. 

	// If Problem 1 doesn't compile, they lose 3 correctness points.
	// If Problem 2 doesn't compile, they lose 2 correctness points.


(1) Problem 1 Correctness: 3 points 
_________________
 Points |   C	|
________ _______ 
  3	|  0-1	|
________ _______ 
  2	|  2-3  | 
________ _______ 
  1	|  4-7	|
________ _______ 
  0	|  7+   |	
________ ________ 


(2) Problem 2 Correctness: 2 points 
_________________
 Points |   C	|
________ _______ 
  2	|  0-2	|
________ _______ 
  1	|  3-6  | 
________ _______ 
  0	|  6+   |	
________ ________ 


(3) Style worth 5 points

________ _____________
 Points |	S
________ _____________
  5	|      0-1	
________ _____________
  4	|      2	
________ _____________
  3	|      3-4	
________ _____________
  2	|      5	
________ _____________
  1	|      6	
________ _____________
  0	|      7+
________ _____________

If they don't submit late (their submissions don't get pink), give them 5 BONUS points.

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