Grading for Project 4

15-212, Spring 1998

The grades for the interpreter will be out of 100, with 90 points given for correctness and 10 for style.

Correctness

We will perform the following test of your code:

Compile to java bytecode via javac Proj4.java.
Feed some lexically, syntactically, and semantically incorrect SL programs to your parser via java Proj4 inputs < bad.sl, and make sure that the interpreter behaves appropriately. That is, the interpreter should distinguish among the above three types of incorrect inputs, and provide an appropriate error message.
Feed some semantically correct SL programs to your interpreter via java Proj3 < good.sl, and make sure that the interpreter behaves appropriately. The only output the interpreter should generate is the values of the write() calls in the code.

For your benefit, here are some common failure modes to check for. The list is just off the top of my head, and certainly not comprehensive:

Does your interpreter go into an infinite loop in while loops, when it shouldn't?
Do function calls behave appropriately, with and without parameters?
Make sure variable shadowing works as specified.
break can only appear within a while loop. Anywhere else is illegal.

Obviously, there are lots of others, and the course staff reserves the right to assign 0/90 correctness points to any project which does not pass the above tests or similar ones.

Style

Same as always.