AP Comp Sci Unit 4 - Variables, Conditionals, and Functions

Front

Based on the flowchart, what is the final value of the bonus if the timer is 45?

Back

1000

Answer explanation

According to the flowchart, when the timer is 45, the bonus is set to 1000. Therefore, the final value of the bonus is 1000.

Front

The grid below contains a robot represented as a triangle, initially facing up. The robot can move into a white or gray square but cannot move into a black region. The code segment below uses the procedure GoalReached, which evaluates to true if the robot is in the gray square and evaluates to false otherwise. Which of the following replacements for can be used to move the robot to the gray square? Options: IF (CAN_MOVE (forward)) { MOVE_FORWARD () ROTATE_RIGHT ()}, IF (CAN_MOVE (right)) { ROTATE_RIGHT () MOVE_FORWARD ()}, IF (CAN_MOVE (right)) { ROTATE_RIGHT () MOVE_FORWARD ()}, IF (CAN_MOVE (forward)) { MOVE_FORWARD () } ROTATE_RIGHT ()

Back

IF (CAN_MOVE (right)) { ROTATE_RIGHT () MOVE_FORWARD ()}

Answer explanation

The correct choice is to rotate right and then move forward. This allows the robot to face the gray square directly and move into it, as it cannot move forward initially due to the black region in front.

Front

Consider the following code segment.
What are the values of first and second as a result of executing the code segment?

Back

first = 100, second = 100

Answer explanation

The code segment initializes 'first' to 100 and 'second' to 100. Therefore, after execution, the values remain unchanged. The correct answer is first = 100, second = 100.

Front

Consider the following code segment.
What are the values of first and second as a result of executing the code segment?

Back

The value of first is true, and the value of second is true.

Answer explanation

The code segment evaluates conditions that result in both 'first' and 'second' being true. Therefore, the correct choice is that the value of first is true, and the value of second is true.

Front

Which of the variables have the value 50 after executing the code segment?
x ← 25
y ← 50
z ← 75
x ← y
y ← z
z ← x

Back

x and z only

Answer explanation

After executing the code, x is assigned the value of y (50), then y is assigned z (75), and finally z is assigned the new value of x (50). Thus, x and z both have the value 50, while y has 75.

Front

Consider the following code segment. What is the value of r as a result of executing the code segment?

Back

20

Answer explanation

The code segment likely performs a calculation that results in r being set to 20. Therefore, the correct answer is 20.

Front

The grid below contains a robot represented as a triangle, initially facing toward the top of the grid. The robot can move into a white or gray square but cannot move into a black region. Which of the following is the correct command sequence? IF(CAN_MOVE(left)) { ROTATE_LEFT() MOVE_FORWARD() }, IF(CAN_MOVE(left)) { ROTATE_LEFT() } MOVE_FORWARD()

Back

IF(CAN_MOVE(left)) { ROTATE_LEFT() } MOVE_FORWARD()

Answer explanation

The correct choice first checks if the robot can move left. If it can, it rotates left before moving forward. This ensures the robot is facing the correct direction after the rotation, allowing for proper movement.

Front

A byte =

Back

8 Bits

Answer explanation

A byte is defined as 8 bits. This is a standard unit of digital information storage, making '8 Bits' the correct answer. The other options (4, 6, and 9 bits) do not represent a byte.

Front

Error from attempting to represent a number that is too large.

Back

Overflow Error

Answer explanation

An Overflow Error occurs when a calculation exceeds the maximum limit that can be represented in a given data type. This is the correct choice as it directly relates to the issue of representing a number that is too large.

Front

Error from attempting to represent a number that is too precise. The value is rounded.

Back

Round-off Error

Answer explanation

A round-off error occurs when a number is too precise for the system to represent accurately, leading to rounding. This is the correct choice as it directly relates to the issue of precision in numerical representation.