CompSci 4 Fall 2010 Test 1 Solutions

1. C

2. a) There is a missing </a> after the word "frog"
b) Apples.png must be an image file. This code displays 
the picture apples.png three times side by side 
horizontally.
c)  Displays as: Duke will win again
with "will" in italics and "again" in bold

3) Lynx could not display images or videos. It could 
also not play sound files or javascript.

4) D

5) A

6) C

7) "move to" moves the center of an object to the center
of another object. If the center locations are in different
places, then that could cause one object whose center is
in the middle of the object to move that center to the feet
of another object whose center is at its feet, causing the
object to go into the ground. 
"move" moves in a certain direction, and is not related to 
centers of objects. 

8) a) camel.friend is the function. It returns an object.
b) the horse distance to camel must be >= 1
c) 2, squirrel
d) amount, animal
e) camel.friend
f) object
g) properties

9) see picture

10) a) 64
b) 25
c) 43 - To get to 43 num1 must == num3 in the first condition, 
and in the second condition num1 must be greater than num3, 
those can't both be true.
87 - This can never be returned since the if statement has a
return value for each part of it. Those return statements 
exit the function, so this code is never reached. 

11) 
hawk turn to face bunny
hawk move up bunny's height
hawk move forward (hawk distance to bunny -2)
hawk say squawk
Do together
   hawk move forward 2 meters
   bunny.upperBody.head turn left 0.25 revs
bunny set vehicle to hawk duration=0
Do together
   hawk move forward 5 meters
   hawk move up 5 meters

12)
motorboat.crush  obj balloon, abc prize
motorboat turn to face balloon
motorboat move forward (motorboat distance to balloon)
balloon set isShowing to false
motorboat say prize


13A) 
obj world.possibleHooper  obj animal1 obj animal2 obj animal3
if both (animal1's height < hoop's width and 
                       animal1's width < hoop's width
    return animal1
else 
    do Nothing
if both (animal2's height < hoop's width and 
                       animal2's width < hoop's width
    return animal2
else 
    do Nothing
return animal3

B)
world.possibleHooper(animal1=hawk, animal2=flamingo, animal3=chicken)
   say "I'll fit through the hoop"
world.possibleHooper(animal1=hawk, animal2=flamingo, animal3=chicken)
   turn to face hoop
world.possibleHooper(animal1=hawk, animal2=flamingo, animal3=chicken)
   move forward (world.possibleHooper(animal1=hawk, animal2=flamingo,
   animal3=chicken) distance to hoop)+5

14) A)
123 kangarooRobot.furthestDistance obj cone1 obj cone2
if ((kangarooRobot distance to cone1)>(kangarooRobot distance to cone2))
   return (kangarooRobot distance to cone1
else 
   do nothing
return (kangarooRobot distance to cone2)

B)
obj kangarooRobot.coneFurthestAwayOf3 obj cone1 obj cone2 obj cone3
if (cone1 distance to kangarooRobot)>
         (kangarooRobot.furthestDistance(cone2, cone3))
return cone1
else 
   if (cone2 distance to kangarooRobot > cone3 distance to kangarooRobot)
      return cone2
   else 
      do nothing
return cone3

C)
kangarooRobot turn to face kangarooRobot.conefurthestAwayOf3
      (cone1 = blackCone, cone2 = yellowCone, cone3 = redCone)
kangarooRobot move forward (kangarooRobot distance to 
       (kangarooRobot.coneFurthestAwayOf3(cone1=blackCone, cone2=yellowCone, cone3=redCone))