• Continue Partners!

Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
• Quiz.
• Lab.

Preliminaries

Admin

• Given where I found Corn Nuts, I may never bring food again.
• How many people have at least two other major things (exams, papers) due next week (in addition to the 151 exam)?
• Review session Monday at 7pm.
• It's nearly prereg time. Think about taking 161 in the fall!
• A friendly reminder: If you miss class, you do have an obligation to send me a note.

Upcoming Work

• Lab writeup: Exercise 4c http://bit.ly/151-2015S-lab39
• Readings for Monday: Elements and Principles of Two-Dimensional Design and About the Project

Extra Credit Opportunities

Academic

• CS Table Friday: Design for User Empowerment http://interactions.acm.org/archive/view/march-april-2015/design-for-user-empowerment
• CS Extras next Thursday: Nora Bressette Buccino on her summer REU (Android and Robots!)
• CS Table next Friday: TBD.

Peer Support (Morning Section)

• Track and Field at Drake on Friday and Saturday. Watch the Javelin throw Friday at 3:45 and see Grinnell's own MWC Most Valuable Player of the Week. Sorry, no live targets.
• KY's radio show, "We Think We're Funny", 9-10pm Mondays. "It's all about Ultimate Flying Disc"
• Julia's radio show, "The Hot Box". Wednesday night/Thursday morning 1:00-2:00 a.m.
• How an admitted student this coming Sunday night (or the following Sunday night)! Contact JMU for info.
• ISO Show, Saturday night 7-9 pm at Harris. Many live performances.
• More things to be announced next week!

Miscellaneous

• Town hall April 23, noon or 7:30 pm, "How we have conversations."

Other Good Things (no extra credit)

Doug Dale's show in Smith

Questions

• None.

Quiz

• If you finish before your partner, get DrRacket started and review the reading.

Lab/Debrief

The ideal outcome of a strong liberal arts education is the ability to bullsh*t coherently and compellingly about any topic.

Rawhide!

Multiple strategies

• Use a let to name the roll

  (define tally-seven-eleven (lambda (n) (cond [(<= n 0) 0] [(let ([roll (pair-a-dice)]) (or (= roll 7) (= roll 11))) (+ 1 (tally-seven-eleven (- n 1)))] [else (tally-seven-eleven (- n 1))])))

• Use a let to name a procedure that checks whether a roll is 7 or eleven

  (define tally-seven-eleven (let ([seven-or-eleven? (lambda (val) (or (= val 7) (= val 11)))]) (lambda (n) (cond [(<= n 0) 0] [(seven-or-eleven? (pair-a-dice)) (+ 1 (tally-seven-eleven (- n 1)))] [else (tally-seven-eleven (- n 1))]))))

• Use member?

  (define tally-seven-eleven (lambda (n) (cond [(<= n 0) 0] [(member? (pair-a-dice) (list 7 11)) (+ 1 (tally-seven-eleven (- n 1)))] [else (tally-seven-eleven (- n 1))])))