CSC152 2006S, Class 23: Polymorphism

Admin:
* Silly College news: Peter Brown appears in this week's Sports Illustrated
* Question: How should the College allocate the new luxury apartments?
* Last chance for in-class questions on the exam!
  * I should have email access over the next few days, but at odd times
  * Note that it helps when you send me code along with questions
* EC for attending Danny Zamora's performance on Thursday or Friday
* Reading for Friday: Inheritance (ready Thursday)
  * Readings take a long time to write.

Overview:
* Notes on Interfaces
* Lab!

/Questions on the Exam/
* The algorithm for converting doubles to fractions gives weird results.  .3 is not 3/10, but rather 29999999999/100000000004
  * That's okay; it's how the algorithm is designed.
  * You are certainly welcome to write a better algorithm IN ADDITION for a modicum of extra credit.
* On the otherwise case of string conversion (problem 4), is the last thing recursive?  Yes.  Probably something like
  return min(this.DELETION_COST + costof(source.substring(1), target),
             this.INSERTION_COST + costof(source, target.substring(1)));
* I can't get the damn counting thing to work.