CompSci 4 Test 2 Solutions Fall 2007

1A. When the world starts
    When up arrow is typed
    While ToadStool is above book

1B. world.myFirstMethod
    dewdropWillowwind move
    wheely turn to face...
    toadStool Turn left ...
    toadStool Move Down ...
    toadStool Move Up...

1C. wheely turns to face toadstool
    toadStool turns around and slowly moves down until it is below ground,
    then the toadStool moves up and all this repeats forever.

2. 0
   chicken
   1
   husky
   2
   hare
   3
   flamingo

3. You need a local variable to store the random number and the maximum
   should be 5 to get numbers up to 5 but not including 5.

   123 temp = random number integer only=true, minimum=2, maximum=5
   penguin resize temp
   penguin resize 1/temp

4A. says hi 9 times
4B. above
4C. 6 meters

5.while (zombie distance to zeus > 0.3)
    zeus move forward 0.5 meters
    zombie turn to face zeus
    zombie move forward 0.7 meters
  zombie says "Gotcha"

6. timer.decrementAndRest 123 startValue
   decrement timer.value by 1
   timer set text to timer.value as a string
   if (timer.value < 1)
      coach say "Reset Timer"
      timer.value set value to startValue
      timer set text to timer.value as a string
   else
      Do Nothing 

7A.
obj world.firstAnimalOfColor color=someColor
For all world.animals, one item_from_animals at a time
    if item_from_animals.color == someColor
       Return item_from_animals
    else
       Do Nothing
return trex
       
7B.
world.equalizer obj someAnimal
For all world.animals, one item_from_animals at a time
   if someAnimal is taller than item_from_animals
       item_from_animals resize (someAnimal's height / item_from_animal's height)
   else
       do nothing

7B. (alternative solution)
world.equalizer obj someAnimal
For all world.animals, one item_from_animals at a time
   while someAnimal is taller than item_from_animals
       item_from_animals resize 1.01

8A. (Note: use AV for ArrayVisualization)
123 world.indexOfTallest
123 tallest = 0
Loop 123 index from 1 up to (but not including) AV's size incrementing by 1
   if the value at AV[index]'s height > the value at AV [tallest}'s height
       tallest set value to index
   else
       do nothing
Return tallest

8A (alt solution) // compute tallest object first
 obj world.Tallest
 123 tallest = the value at ArrayVisualization[0]'s height
 Loop 123 index from 1 up to (but not including) AV's size incrementing by 1
    if the value at ArrayVisualization[index]'s height > tallest
       world.Tallest set value to the value at ArrayVisualization[index]
    else
       do nothing
// now find the tallest 
 Loop 123 index from 0 up to (but not including) AV's size incrementing by 1
    if the value at ArrayVisualization[index] == world.Tallest
       return index
    else
       do nothing

 return 0 // should return before you get here.


8B. 
123 world.NumberVisible
123 count = 0
Loop 123 index from 0 up to (but not including) 6 incrementing by 1
   if the value at ArrayVisualization[index].isShowing
      count set value to (count +1)
   else
      do nothing
return count