Quiz 2, CS 257

1. Respectable plant-people of the planet Blorg have their names inscribed upon their trunks shortly after germination. When a purple Blorgian speaks someone's name, it adds a suffix "-OOK-OOK" to the name inscribed on their trunk. When a green Blorgian addresses someone, it adds a prefix "BLIP-" to their name if it starts with a "Z", adds the prefix "BLOP-" to their name if it starts with a "Q", and adds the honorific suffix "-ICHOR" if it ends with an "S".

   Define a function (BLORG-SPOKEN-NAME COLOR-OF-SPEAKER NAME-ON-TRUNK) which, given the color of the speaking Blorgian and the name inscribed on the trunk of the Blorgian being addressed, returns the name to be spoken.

   For example:
   

   Color of Speaking Blorgian	Name on Trunk of Blorgian Being Addressed	Name to be Spoken
   PURPLE	ZACH	ZACH-OOK-OOK
   GREEN	ZACH	BLIP-ZACH
   GREEN	ZAQS	BLIP-ZAQS-ICHOR
   GREEN	QUUX	BLOP-QUUX
   GREEN	QUIS	BLOP-QUIS-ICHOR
   GREEN	JIMMY	JIMMY
   PURPLE	JIMMY	JIMMY-OOK-OOK

2. Define a function (ADD-UP SEN) that, given a sentence of numbers, returns the sum of all the numbers in the sentence. For instance, (ADD-UP '(93)) = 93, (ADD-UP '(1 3 5)) = 9, and (ADD-UP '()) = 0.

3. What values are printed when you type each of the following to Scheme?

   expression	result
   (or #f #f 'aye 'bee)
   (and #t #t 'aye 'bee)
   (sentence 1 2)
   '(sentence 1 2)
   (word 12 13)
   (first 98765)
   (first '(98 76 5))
   (butfirst '(98 76 5))
   (quote (and 1 2))
   (not 'false)

4. Rewrite the following using IF rather than COND.

   (define (utensil cuisine)
      (cond ((equal? cuisine 'chinese) 'chopsticks)
            ((equal? cuisine 'ethiopian) 'fingers)
            (else 'fork)))