CSC151.02 2016S, Class 36: Randomized (Unpredictable) Drawing ============================================================= _Overview_ * Preliminaries. * Admin. * Upcoming Work. * Extra Credit. * Questions. * Quiz. * Lab. Preliminaries ------------- ### Admin * Continue partners. * I will continue to bring you food (or food-like substances) until I am caught up on grading. * Yay! The College got money. * Friday PSA. ### Reminders * Office hours this week * See http://rebelsky.youcanbook.me. * Ask me about other available times. * Tutor hours * Sunday, 3-5 p.m. * Sunday-Thursday, 7-10 p.m. ### Upcoming Work: * Reading for Monday: * [Pairs and Pair Structures](../readings/pairs-reading.html) * Lab Writeup: * Send email titled __CSC 151 Lab Writeup 36 (Your Names)__ * Do not include the underscores. * Send to * Due before class on Tuesday. * Exam prologue due tonight * Exam due Tuesday ### Extra Credit * Send your reports to with subject "CSC 151 Extra Credit". (Do not include the quotation marks.) * Send opportunities to me before class with subject "CSC 151 EXTRA CREDIT OPPORTUNITY!" #### Academic / Artistic * BAX TODAY, 4pm, Bucksbaum. * Next week's celebration of student scholarship. #### Peer * Fun Japanese Spring Festival TONIGHT at 7pm. Origami and food! * Game Dev Class Demos, Monday, 2-3 pm, DLab. Free food! #### Miscellaneous * Pioneer weekend. THIS WEEKEND. Business hack-a-thon. * Host a prospective student. #### Regular Peer * Social Dance Workshop Tuesdays 7:00-8:00 in Bucksbaum Dance Studio * Post-break ExCo on British Politics Wednesdays at 8:00 in JRC 203. Just show up; you don't need to sign up. * Pun club Saturdays at 4pm in Younker * Electronic Potpourri on KDIC Fridays at Five * Space Odyssey KDIC Fridays at Six * Bollywood, Fridays, 7:30-8:30, Younker * Effective Altruism club, 2:30-3:30 Sundays in JRC 226. #### Misc #### Far in the Future * Lords of the Flies, April (maybe the 22nd). * Adaptation of Rushdie's East West. Early May. ### Other Cool Stuff * Mission Creek Festival in Iowa City has some cool talks about technology and the arts, . ### Questions _I really want to take the awesome-sounding one-credit course entitled "Social Justice Issues Influencing American Business". But it overlaps with 151. Can I miss four sessions without penalty?_ > Yes, provided you make up the labs on your own. _I'd really like to take CSC 207 in the fall. Is it possible to do 161 over the summer?_ > We provide two alternate tracks for 161 over the summer. Neither counts toward the 32 credits in the major, but they do allow you to go on to 207. > You can take the Harvard CS 50 course on EdX. > You can use the pre-robots version of CSC 161 and have me give you a test at the end of the summer. < http://www.cs.grinnell.edu/~walker/courses/161.sp10/> > I'll do my best to answer questions in either context. > We have about a 50% success rate for either option. _Is grading done yet?_ > No. It appears that all the signs that Minna posts about sleep are correct. _Monday?_ > I certainly hope so. _Have people started asking good questions about the exam?_ > Yes. _Can you go over some of them?_ > Maybe. _I need more than one consequent in an `if` statement. What do I do?_ > Use `cond` or `when`. _I don't need an alternate in an `if` statement. What do I do?_ > Use `when`. _Can I use `list-drop` or `list-take` in solving `rdc` or `rac`?_ > No. _Can cond really do more than one step?_ (define process-list (lamda (lst) (cond [(null? lst) (void)] [(odd? (car lst)) (display "It strikes me that ") (display (car lst)) (display " is somewhat odd") (newline) (process-list (cdr lst))] [else (process-list (cdr lst))]))) _Can you do an example of a named let really quick?_ > Form (let NAME ([PARAM INIT-VALUE] [PARAM INIT-VALUE]) BODY) > Example (define tally-odd (lambda (lst) (let colonel ([tally 0] [remaining lst]) (cond ; NOTHING LEFT [(null? remaining) tally] ; ODD CAR [(odd? (car remaining)) (colonel (+ 1 tally) (cdr remaining))] ; EVEN CAR [else (colonel tally (cdr remaining))])))) BODY) Quiz ---- Lab --- Writeup is 1b. But you should play with the rest of the lab; it's fun (and may even help you on the exam).