TASK
The task is to extend the compiler to provide parsing, AST, pretty
printing, and type-checking. You do not need to worry about getting
well-formedness right. We will talk more about it next week.
You should support the following constructs.
* do-while loops
* for loops
* switch statements (C-style, with case and default)
* continue (works with do, for and while)
* break (works with do, for, switch and while)
* pre-increment: ++e (e must be int lval, ++e is not an lval)
* post-increment: e++ (e must be int lval, e++ is not an lval)
* conditional expressions: e1?e2:e3 (e1 must be int, e1?e2:e3 is not an lval)
The semantics should be consistent with C. You may want to look at a C
reference to ensure that you understand the semantics. For example:
http://msdn2.microsoft.com/en-us/library/015az3wz%28VS.80%29.aspx
I suggest that you code/test incrementally AND take frequent snapshots of
your code (perhaps using "ant submit") so that you can revert to an earlier
version if a subsequent change does not work out.
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SUBMISSION
The same criteria for grading and submission instructions apply as
before. Copy grader.txt into examples/clogs/grader.txt and run "ant
submit" in examples/clogs.
