CompSci 94 Exam 2 Fall 2021 Rubric

Problem 1 
A 1) 18 times
A 2)  3 times
B) 3 times
   When amount is 0, 3 and 6. Then amount is 9 and the while condition
      "amount < 8" is false.

Problem 2 
A) airplane
B) boat
C) Any answer that has somenum a number from 9 to 15 and paintColor is
   any color other than green.

   For example, somenum is 10 and paintColor is blue, will have the
   blackCat say train. 

Problem 3 

3A) First all the animals in the array turn around once at the same time.
   Next, the cow says each of the phrases in the words array one at a time
   in this order:  "hello", "goodbye", "sing", "run", "walk".
   Next the horse says "run"
   Next the cow moves down underground, then the fox moves underground, and
   then the poodle moves underground.

3B) bear says "hello"
   cow says "goodbye"
   camel says "sing"
   fox says "run"
   [Note the loop only executes four times ]

3C) The variable indexThree is not updating, it stays 0 because the if
statement is false the first time (since the first word "hello" does not
start with "s"), and the update for indexThree is in the true part of the
if statement. This results in an infinite loop.

To fix: The line: indexThree <- indexThree + 1
should be moved to be right after the if statement and before the end of
the while loop. Then it will update each time through the loop. That would
make the loop stop when it is updated to 5. 

ALTERNATE WAY TO FIX:
Add a line: indexThree <- indexThree + 1
in the else.
Then in the if true part and the else part the indexThree is always
updated.

4. 
A. Biped
B. bunny
C. whiteRabbit
D. This function returns the first object in the creature array whose
height is smaller than the tortoise's height. If there is no object in the
array with smaller height, the tortoise is returned.  


5. 
A. The tortoise says hello
B. The whiteRabbit turns around once
C. The whiteRabbit moves up ad down
D. Nothing happens, the whiteRabbit is not in the Visual array of objects
that can be clicked on.

6. 
A. The cow says "Moo", the wolf says "Bark", the moose says "The end"
B. Nothing happens
C. The moose turns around, the camel says "Water", the moose says "The end"

7. 
A. The panda moves forward 1.0 colliding with the tortoise, and at the same
time the yetiBaby moves backward 1.0  and colliedes with the hare. 
Next the hare moves backwards 1.0 (due to the collision) and at the same
time the panda moves right 1.0. (due to its collision)
Next the tortoise moves back 1.0 and then to its left 2.0 and collides with
the yetiBaby.
Next the hare moves back 1.0 due to the new collision.

SHORT VERSION:
Panda moves forward 1 and yetibaby moves backward 1.0 at same time.
Hare moves back 1.0 and panda moves right 1.0 at the same time
Tortoise moves back 1.0, then left 2.0.
Hare moves back 1.0

B. A) The panda moves left 1.0 and collides with the Hare.
Next the hare moves back 1.0 and then the yetiBaby turns around once.

B. B) If the user presses the W key the tortoise moves left and collides
with the yetiBaby. That makes the hare move back 1.0 followed by the
yetiBaby turning around once.

If the user then presses any key other than W, the tortoise moves back
1.0. After pressing a second key the tortoise could collide with the hare
making it move back 1.0 and then the yetiBaby turning around once. This
could continue forever (press any key, tortoise moves back 1.0 collides
with hare which then moves back 1.0 followed by the yetiBaby turning around
once.). 


8. 

8A. The timer starts at 20 and counts down by 1 forever.

8B.
addMouseClickOnObjectListener, setOfVisuals this.bunny
procedure mouseClicked

if this.bunny getPaint == WHITE
   this.bunny setPaint RED
else
   if this.bunny getPaint == RED
      this.bunny setPaint BLUE


ALT SOLUTION:

addMouseClickOnObjectListener, setOfVisuals this.bunny
procedure mouseClicked

if getModelAtMouseLocation getPaint == WHITE
   getModelAtMouseLocation setPaint RED
else
   if getModelAtMouseLocation getPaint == RED
      getModelAtMouseLocation setPaint BLUE

ALT SOLUTION

addMouseClickOnObjectListener, setOfVisuals this.bunny
procedure mouseClicked

if this.bunny opacity >  .95
   this.bunny setPaint RED
   this.bunny setOpacity .90
else
   this.bunny setPaint BLUE

8C
add event addKeyPressListener

if event isKey W
    this.timer updateTimer -5

OR

add event addKeyPressListener

if event isKey W
    this.setTimerNumber timerNumber TimerNumber + 5
    this.setValue "" + this.timerNumber


8D.
while this.timerNumber > 0 and this.bunny getPaint Not == Blue

8E.

Add a boolean variable under scene properties called gameOn and set to
False

In the addTimerListener event,  add an if statement around the
code that is there so the code is:

if gameOn
    this.timer updateTimer amount 1

In myFirstMethod, before the while loop set gameOn to true and after the
while loop set gameOn to false.


ALT SOLN

in the addTimeListener event change the code to:

if this.timer getTimerNumber > 0
   this.timer updateTimer amount 1


9. 
9A)

procedure paintInRange with parameters DecimalNumber minRange,
      DecimalNumber maxRange, Paint somePaint
      
for each Panda somePanda in this.pandas
    if both somePanda getHeight >= minRange and somePanda getHeight <= 	maxRange
	 some Panda setPaint somePaint

9B)
Panda function FirstofColor with parameter Paint paintColor

for each Panda onePanda in this.pandas
    if onePanda getPaint == paintColor
        return onePanda

return this.pandas[0]

ALT SOLUTION

wholeNumber index <- 0
while index < this.pandas length
   if this.pandas [index] getPaint == paintColor
        return this.pandas[index]
    else
        do nothing
   index <- index + 1
loop
return this.pandas[0]

9C)

If this.FirstOfColor paintColor RED getPaint == RED is true then
    this.FirstOfColor paintColor RED say "I'm the first red"
else
    this.FirstOfColor paintColor RED say "There are no red pandas"