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
• Lab Writeup:
  • Send email titled CSC 151 Lab Writeup 36 (Your Names)
  • Do not include the underscores.
  • Send to CSC151-02-grader@grinnell.edu
  • Due before class on Tuesday.
• Exam prologue due tonight
• Exam due Tuesday

Extra Credit

• Send your reports to rebelsky@grinnell.edu 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, http://missionfreak.com.

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. https://www.edx.org/course/introduction-computer-science-harvardx-cs50x

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).