CSC151.01 2015F, Class 44: Files in Scheme
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_Overview_

* Preliminaries.
    * Admin.
    * Upcoming Work.
    * Extra Credit.
    * Questions.
* Lab.

Preliminaries
-------------

### Admin

* New partners!
* Review sessions this week:
    * TONIGHT, 8pm (Caleb)
    * Thursday, 10am (SamR)
    * Thursday, 8pm (Erin)

### Upcoming Work

* Projects: Next Tuesday at 10:00 a.m.
* No Reading for Friday!
* Today's Lab writeup (due Monday)
    * Email to <grader-151-01@cs.grinnell.edu> 
    * Subject: _CSC 151 Lab Writeup Class 44 (Your Names)_
    * Exercises: 6

### Extra Credit Opportunities

* If possible, send me these in advance.
* Note: You don't get extra credit for supporting yourself.

#### Academic

* Any visit to the current show in the Faulconer gallery.
* Learning Deconstructed Workshop Series, Tuesdays at 11 in JRC 209.
* Scholars' Convocation Thursday: Cosmic Secrets: Soviet Space Exploration,
  Censorship, and the Cold War.
* Metropolitan Opera Simulcast, November 21, 11:30 a.m. Lulu by Berg, 
  Harris Cinema.  (Warning!  It's about four hours long.)
* *Saturday Night's Silent Film + Live Score.*
* *Talk on the Future of Libraries, Monday, noon.*

#### Peer Support

* Translations (a play).  7:30 p.m. Thursday through Saturday,
  2:00 p.m. Sunday.  Tickets at the Box Office.
* Project P has something Thursday from 5-8pm in JRC 2nd floor.  Food!
  Some food authentic, some stereotypical, some monotypical.
  (Required at least 30 minutes; do not walk out in the middle of a talk.)

#### Miscellaneous

* Noontime rally, Thursday, in support of the Missouri students and of our
  own students of color.

#### Regular Peer Support

* Pals of PALS, pals@grinnell.edu, normally Saturday at 7:45 am (breakfast
  included; felines only), and Mondays at 4:45.  Requires sign up in 
  advance.    MORE HELP NEEDED!
* Socrates Cafe', Saturdays, Younker, 2pm.
* Pun Club, Saturdays, 4pm, Way over Younker.

#### Upcoming Peer Support

* Women's Basketball vs. Beloit, Nov. 28 at 3:00 p.m.
* Women's Basketball vs. St. Norbert, Dec. 5 at 3:00 p.m.
* One-act Festival Dec. 5 & 6.
* Women's Basketball vs. Carroll, Dec. 12 at 3:00 p.m.

### Other Good Things (No Extra Credit)

* Jazz Band Wednesday.
* Latin-American Ensemble Thursday.
* Swim Meet Saturday.
* *Jingle Bell Holiday Friday.*

### Questions

Lab
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How do we know that `sum-of-file` is correct?

* Try it on a file we design, rather than the one you supplied.
* Read the code and analyze its correctness.  (Worries ... are we sure that
  has gotten every value from the file?)
* Open the file and ...

Hint for problem 2

* `(read source)` is not your friend.

Hint for problems 4 and 6

* `display` may 

Writeup: Exercise 6