Quiz Stuff

• Use a full sheet of 8½ x 11" paper. (Half sheet? Half credit!)
• Put your last name and first initial in the far upper left hand corner!
  
• No need to write out questions.
• Numbering responses may help you avoid overlooking a question; it's ok to go ahead and pre-number your sheet.
• Time: Four minutes; five one-point questions, one two-pointer, and a one-point EC.

Quiz 11; Wednesday, April 12; Four minutes; (5 x 1) + 2 points

1. What's the relationship between Lisp, Racket, and Scheme?
2. What's something that's interesting about Racket's operators?
3. It's said that define, cond, and (and others) are special forms. In general, what's special about a special form?
4. Write the Java expression a*b+c in Racket.
5. Write an expression that creates a list containing the symbols one and two.
6. Write a definition for a Racket procedure 2nd that returns the second element in a list having at least two elements. Example:

   > (2nd '(5 3 7 9))
   3
   

• a*b+c can be expressed in Racket as (+ (* a b) c)
• Here are three ways to write 2nd:

  (define (2nd-1 lst)
      (cadr lst))
      
  (define (2nd-2 lst)
      (second lst))
      
  (define (2nd-3 lst)
      (list-ref lst 1))
  

  Quick sidebar: As a rule, I never use list as a parameter name because it then hides the built-in procedure list, often leading to a baffling error.