--- title: Eboard 19 Debugging number: 19 section: eboards held: 2019-03-08 link: true --- CSC 151 2019S, Class 19: Debugging =================================== _Overview_ * Preliminaries * Notes and news * Upcoming work * Extra credit * Friday PSA * Questions * Quiz * Lab Preliminaries ------------- ### News / Etc. * Mentor sessions Wednesday 8-9 p.m., Thursday 8-9 p.m., Sunday 5-6 p.m. * In case it wasn't clear, you are *not* responsible for the second lab from Wednesday's class. * Reminder: We lose an hour on Sunday morning. * Grinnell's admissions database was hacked * * Do we think that the Grinnell admissions data breach is due to a technical hack or a social hack? * Do we think that the Grinnell admissions breach is the first step in a more complicated chain? ### Upcoming work * *No* reading for Monday. * [Exam 2](../exams/exam02) due Tuesday. * Prologue due **Tonight** * **Do not discuss the exam.** * No flashcards next week! * [Lab writeup](../labs/writeup19) due before class Monday * Exercises: 4 and 5 * Subject: CSC 151.01 Writeup for Class 19 (YOUR NAMES) * To: csc151-01-grader@grinnell.edu * Contents: A one-paragraph summary of your discussions. * _You can skip exercise 3._ * It's ok if you only discuss exercise 4. * Quiz next Friday: Match first names and faces. Those with multiple names will likely see both names appear. ### Extra Credit _I would certainly appreciate suggestions of other extra credit activities (preferably via email)._ #### Extra credit (Academic/Artistic) * CS Table, Tuesday, noon: Unknown topic * Euphor workshop, 1 p.m. Saturday, March 9, Bucksbaum * Euphor performance 7:30 p.m. Saturday, March 9, Herrick #### Extra credit (Peer) * Grinnell Singers, Sunday at 2pm. * Twelfth Night this weekend * Mock Trial, Geneva, Illinois, tonight and tomorrow #### Extra credit (Wellness) #### Extra credit (Wellness, Regular) * 30 Minutes of Mindfulness at SHACS every Monday 4:15-4:45 * Any organized exercise. (See previous eboards for a list.) * 60 minutes of some solitary self-care activities that are unrelated to academics or work. Your email reflection must explain how the activity contributed to your wellness. * 60 minutes of some shared self-care activity with friends. Your email reflection must explain how the activity contributed to your wellness. #### Extra credit (Misc) ### Other good things * Rosencrantz and Guildenstern are Dead (or at least misspelled), Friday and Saturday at GHS. * Men's Tennis Saturday at 9am. * Class of 2022 talent show. ### Friday PSA * I care about you. Take care of yourselves, including limiting your time on my exam. * Consent is essential. ### Questions _I forgot to log some of my time on the exam. What should I do?_ > Put in an approximate log. ; Time Log: ; Date Start Finish Elapsed Activity ; 2019-03-07 ~3:00 ~3:30 ~30min Woke up, typed code, went back to sleep (approx) _I think I can reuse a solution from a lab or homework assignment on this exam. Is that okay?_ > Sure, as long as you cite. E.g., "Lab from 03/06, completed by student 823412 and partner" or "Problem 2 on HW 5, completed by student 123152 and partner." _Should there be a time log for the prologue?_ > Yes. ;; +----------+------------------------------------------------------- ;; | Prologue | ;; +----------+ ; Time Log: ; Date Start Finish Elapsed Activity _On problem 3, what do you mean by "simplify any unnecessarily complicated code"?_ > There's a *lot* of useless code in the procedure. Get rid of it. _What's the `pair` in problem 3?_ > It wasn't supposed to be there. It now reads `hash`. (It was correct in the starter code.) _Did we get extra credit for any of the above errors?_ > Yes. _Can we put in insane restrictions in the preconditions, such as "all fieldsd must contain strings and those strings can only contain the letter a"?_ > No > But you can say "no quotation marks, no backslashes" > You must allow commas and colons. > You will not lose points for disallowing quotation marks and backslashes. _Why doesn't SHACS have mental health appointments?_ > I don't know, but you should be able to use telecounseling. > And, although it is not my responsibility, I express regret that the College is not able to provide sufficient face-to-face counseling resources, particularly during midsems and data breaches. _How would you social engineer an attack on our password system?_ > Develop a resource that people would want to use. > Set up an account creation system that requires "security" questions similar to those on PasswordReset. > Send an announcement to everyone in some group (e.g., admissions). > Alternately, set up one of those "learn about yourself" (e.g., "What kind of animal are you?") quizzes and ask things similar to the security questions. _How does sort work?_ > You don't need to know *how*, but you need to know *what*. > Sort takes two parameters, a list and a "less than operation", and rearranges the list so that each element is less than the next element. > Your goal on problem 5 is to come up with the appropriate "less than operation" (binary predicate) that tells sort when to swap. Quiz ---- Lab --- It should be loads of fun, or at least loads of confusion. Yes, the code for `average-w/o-extremes` is incorrect. It is *intentionally* incorrect. Our goal in this lab is to see how we can track down bugs using the debugger. The debugger will be very important starting next Wednesday. `filter-range` is so strange because, in an earlier iteration of CSC 151, we had students write it before they learned `filter`, but after they learned `sort`, `take`, and `drop`. (We like to challenge students to do things with limited tools; you've probably figured that out.)