CSC151 2010S, Class 31: Naming Local Recursive Procedures

Overview:
* Penguins!
* Exam 2
* Questions
* Lab

Admin:
* Reading for Friday: Randomized Drawing.
* Sugar
* I regret to inform you that there will not be an assignment due on the Wednesday after break.
* EC for Thursday's CS Extra (4:30 in 3821).
* EC for Friday's CS Table (noon in JRC PDR).
* Today's outline has much more text than I plan to cover.

Penguins
* Input: 
  * Three (or five) pipe cleaners of one color
    (for the body)
  * One of a color (for the chest color)
  * One of a color (for the feet/beak)
  * A pen or pencil
* Scheme
(define penguin
  (lambda (pc0a pc0b pc0c pc1 pc2 pen)
    (let ((body
           (wrap-around
             (twist-together pc0a pc0b)
             pen))
          (head
           (squish-all-but-an-inch-into-a-ball
            pc0c))
          (bill-and-feet
           (make-w-shapes
            (fold-two-thirds
             (fold-in-half pc1))))
          (chest
           (twist-into-tight-spiral pc2)))
      (jab-into-front
        (jab-through-top
          (jab-through-vertical-axis
             body 
             bill-and-feet)
          head)
        chest)))))

Exam Q's