AP CS Unit 5 Pseudocode Quiz

After running the following code segment, what is contained in the array data?

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Choose the best description of what the mystery procedure below does. The procedure accepts two parameters: a list of a values and a number n.

PROCEDURE mystery (list, n)

{

i = 1

REPEAT LENGTH(list) TIMES

{

IF ( list[i] = n )

{

DISPLAY (i)

}

i = i+1

}

}

• Mystery displays the number at index n.

• Mystery displays the index of the first occurrence of the value n in the list.

• Mystery displays the index of the last occurrence of the value n in the list.

• Mystery displays the index of every occurrence of the value n in the list.

• Mystery displays true if n is in the list.

Which of the following best describes the value returned by the procedure below?

PROCEDURE mystery (data)

{

count = 0

i = 1

REPEAT UNTIL (i = LENGTH(data))

{

IF (data[i] < data[i+1])

{

count = count + 1

}

i = i+1

}

DISPLAY(count)

}

The answers below refer to values being in ascending and descending order. Ascending order means increasing, as in: [1, 2, 5, 8]. Descending order means decreasing, as in [20, 15, 7, 3].

• The procedure displays true when data is in ascending order

• The procedure displays false when data is in descending order

• The procedure displays the number of times adjacent items are in ascending order

• The procedure displays how long it takes to find two numbers in ascending order

• The procedure counts how long it takes to find two numbers in descending order and displays that number

A robot starts in a grid facing north (B3). What is the robot's location and direction after the following program is executed?

data = ["F", "F", "R", "F", "L", "F", "R", "R", "F"]

FOR EACH move IN data

{

IF ( move = "F" AND CAN_MOVE(forward) )

{

MOVE_FORWARD()

}

ELSE IF (move = "R"){

rotate_right()

}

ELSE IF ( move = "L") {

rotate_left()

}

}

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Which of the following best describes the result of running the procedure below?

PROCEDURE mystery (a, b, c)

{

IF ( a >= b AND a >= c)

{

DISPLAY(a)

}

ELSE IF ( b >= a AND b >= c)

{

DISPLAY(b)

}

ELSE

{

DISPLAY(c)

}

}

• mystery displays the smallest of the three input values

• It displays the middle of the three input values

• It displays the largest of the three input values

• It displays the average of the three input values

• It always displays c

The following program processes the list data shown below. What is the output of the following program?

val = 0

i = 1

REPEAT 3 TIMES

{

val = val + data[i]

i = i + 1

}

DISPLAY (val)

• 3

• 9

• 17

• 42

The following program processes the list data shown below. After running the following program, what is contained in the list?

i = 1

val = 0

n = LENGTH(data)

REPEAT n TIMES

{

val = val + data[i]

data[i] = val

i = i + 1

}

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Assuming that the list data below is given as the parameter to the procedure, what is returned by the following procedure?

val = 0

FOR EACH item IN data

{

IF (item > val)

{

val = item

}

}

DISPLAY(val)

• 3

• 4

• 9

• 10

• 16

What are the values of x and y after this script runs?

• x is equal to 15; y is equal to 15

• x is equal to 5; y is equal to 10

• x is equal to 15; y is equal to 10

• x is equal to "x + 5"; y is equal to "x"

• x is equal to 10, 15; y is equal to 5, 10

What will be displayed after running this code?

• All done.

• Inside the if.

• Inside the if.

  All done.

• Inside the else.

  All done.

• Inside the if.

  Inside the else.

  All done.