CompSci 94 Spring 2018 Test 2 Solutions

Problem 1
1A. Events: sceneActivated, pointOfViewChanged, keyPressed

1B. 
Bunny turns to face Panda, says hello and the panda turns around.
Then the Dalmation turns to face the tortoise, and moves towards
the tortoise one unit. 

1C. 
The user can press the letter M. This cause the tortoise to move
right just a little and then the panda to move left a little. 
This results in the Dalmation turning to face the tortoise and move
one unit toward the tortoise. 

That could be repeated.

Problem 2
2A. The animals in the array move up 2 units, one at a time with the pig 
first, then the panda, then the marchHare, then the tortoise, then the
stuffed tiger and last the bunny. 
Next all six animals move back down to the ground at the same time. 

2B. The panda turns all the way around, then the marchHare turns 
all the way around, and then the tortoise turns all the way around. 

Problem 3
3A. WholeNumber

3B. variable

3C. Any Quadruped could be put into the array. 

3D. 0 or 1

3E. The function randomly makes some of the coyotes invisible, and 
it returns the number of coyotes that it turned invisible.

Problem 4
4A. The seagull moves up and down. 

4B. Nothing happens

4C. The peacock turns around

4D. Nothing happens

Problem 5
5A. scoreDisplay

5B. 
It would be good to add a parameter that is a WholeNumber, say called
amount. Then the code for the procedure would be:

scoreNum = scoreNum + amount
scoreDisplay setValue scoreNum

5C. 
Replace the mouseClicked event with two mouseClicked events:
1) Set the items to click on to the penguins array
Code:

if gameOn is True:
   updateScore amount = 1

2) Set the items to click on to the bunnies array
Code:

if gameOn is True
   updateScore amount = -1

5D. 
Modify the mouseClicked event for clicking on the penguins array

Code:
if gameOn is true
   updateScore amount = 1
   if scoreNum >= 10
      setGameOn to false

ALTERNATE SOLN:

Modify myFirstMethod to add at the end of it, right after you set gameOn to
true

Code:

while gameOn == true:
    if scoreNum >= 10
        setGameOn to false
 



Problem 6
6A. The bunny turns around and the fox says hello

6B. The panda jumps up and down and then the poodle turns backward
and then forward. 

6C. Nothing happens

6D. After the Panda moves up and down, add in the command:

panda setOpacity 0.0

Problem 7

The line in the body of the if:

return onePerson 

Should instead be:

tallestSoFar = onePerson

Problem 8
8A. 

WholeNumber count = 0
for each Flyer someOne in penguins
    if Both someOne getHeight >= minRange AND someOne getHeight <= maxRange is true then
        count = count + 1
 loop
return count

ALT SOLN

WholeNumber count = 0
for each Flyer someOne in penguins
    if someOne getHeight >= minRange 
        if someOne getHeight <= maxRange is true then
             count = count + 1
 loop
return count

8B.

if BOTH numSmall > numMedium AND numSmall > numLarge is true then
    eagle say "There are more small penguins"
else
   if BOTH numMedium > numSmall AND numMedium > numLarge is true then
       eagle say "There are more medium penguins"
   else 
       eagle say "There are more large penguins"

ALT Soln

if BOTH numSmall > numMedium AND numSmall > numLarge is true then
    eagle say "There are more small penguins"
else 
   // Know small is not the most 
   if numMedium > numLarge is true then
       eagle say "There are more medium penguins"
   else 
       eagle say "There are more large penguins"

ALT Soln


TextString size = "hello"

if BOTH numSmall > numMedium AND numSmall > numLarge is true then
    size = "small"
else
   if numMedium > numLarge is true then
       size = "medium"
   else 
       size = "large"

eagle say "There are more " + size + " penguins"