CSC151.02 2014S, Class 26: Recursion with Helper Procedures
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_Overview_

* Preliminaries.
    * Forthcoming work.
    * Admin.
    * Questions.
* Basics of helper recursion.
* A term: Tail recursion.

Preliminaries
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### Forthcoming work

* Reading for Wednesday: List Recursion, Revisited
* Today's lab writeup: Exercise 6
    * CSC 151.02 Writeup 17: Helper Recursion
* HW 6 due tonight!
* Exam prologue due Sunday.

### Admin

* Kim will be teaching class today.  Thanks Kim!
* Mr. Stone will be teaching class Wednesday and Friday.
* Exam 2 will be distributed tomorrow (via email).
* No quiz on Friday!
* Choose your own partners today.  
    * Strive to find someone you have not worked with before.
    * You'll stick with these partners for the rest of the week.
* Extra credit for any volunteer to do an eboard for Wednesday.  Email
  SamR if you're willing.
* Extra credit: 
    * Convocation Wednesday, March 5.
    * Orchestra and Narration and Animation, Wednesday, March 5
    * Grinnell image presentations at noon on Thursday and Friday.
    * First Years: How to Use Your Summer, 8-9 pm on March 6 in JRC 101.
    * Balancing Acts
        * Friday, 7 March at 7:30 in Flanagan
        * Saturday, 8 March at 7:30 in Flanagan
        * Sunday, 9 March at 2:00 in Flanagan
    * Neverland Players this weekend
        * Friday, 7 March at 7:00 in the Wall
        * Saturday, 8 March at 2:00 in the Wall
        * Saturday, 8 March at 7:00 in the Wall
        * Sunday, 9 March at 2:00 in the Wall
    * Men's Tennis, Saturday, 8 March (8 am or 4pm)

### Questions

Basics of helper recursion
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A term: Tail recursion
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