AP®Computer ScienceCollege BoardComputer Science PrinciplesExam QuestionsUnit 3: Algorithms and ProgrammingControl Structures

Control Structures (College Board AP® Computer Science Principles): Exam Questions

18 mins18 questions
Easy
Medium
Hard
1
1 mark

Consider the following code segment.

temp ← 18

IF(temp > 25)

{

   DISPLAY("Hot")

}

What is displayed?

  • Hot

  • Nothing is displayed

  • 18

  • An error occurs

Choose your answer

2
1 mark

Consider the following code segment.

age ← 20

IF (age ≥ 18)

{

   DISPLAY("Adult")

}

What is displayed when this code segment is executed?

  • Adult

  • Nothing is displayed

  • 20

  • An error occurs

Choose your answer

3
1 mark

Consider the following code segment.

num ← -4

IF (num ≥ 0)

{

   DISPLAY("Non-negative")

}
ELSE

{

   DISPLAY("Negative")

}

What is displayed when this code segment is executed?

  • Non-negative

  • 0

  • Nothing is displayed

  • Negative

Choose your answer

4
1 mark

Consider the following code segment.

day ← "Sun"

IF (day = "Sat" OR day = "Sun")

{

   DISPLAY("Weekend")

}

What is displayed when this code segment is executed?

  • Nothing is displayed

  • Sun

  • Weekend

  • An error occurs

Choose your answer

5
1 mark

Consider the following code segment.

total ← 0

REPEAT 4 TIMES

{

   total ← total + 3

}

DISPLAY(total)

What is displayed when this code segment is executed?

  • 3

  • 12

  • 4

  • 7

Choose your answer

6
1 mark

Consider the following code segment.

value ← 1

REPEAT 5 TIMES

{

   value ← value * 2

}

DISPLAY(value)

What is displayed when this code segment is executed?

  • 10

  • 32

  • 16

  • 64

Choose your answer

1
1 mark

Consider the following code segment.

n ← 7

IF(n MOD 2 = 0)

{

   DISPLAY("Even")

}
ELSE

{

   IF(n > 5)

   {

      DISPLAY("Odd and large")

   }

   ELSE

   {

      DISPLAY("Odd and small")

   }

}

What is displayed?

  • Even

  • Odd and large

  • Odd and small

  • Nothing is displayed

Choose your answer

2
1 mark

Consider the following code segment.

sum ← 0

i ← 1

REPEAT UNTIL(i > 4)

{

   sum ← sum + i

   i ← i + 1

}

DISPLAY(sum)

What is displayed?

  • 6

  • 10

  • 15

  • The loop runs infinitely

Choose your answer

3
1 mark

Which of the following code segments would result in an infinite loop?

  • k ← 0

    REPEAT UNTIL(k ≥ 3)

    {

       k ← k + 1

    }
  • k ← 0

    REPEAT UNTIL(k = 5)

    {

       k ← k + 2

    }
  • REPEAT 5 TIMES

    {

       DISPLAY("Hi")

    }
  • k ← 10

    REPEAT UNTIL(k ≤ 0)

    {

       k ← k - 1

    }

Choose your answer

4
1 mark

Consider the following code segment.

result ← ""

REPEAT 3 TIMES

{

   result ← result + "ab"

}

DISPLAY(LENGTH(result))

What is displayed?

  • 2

  • 3

  • 6

  • 9

Choose your answer

5
1 mark

Consider the following code segment.

score ← 63

IF (score ≥ 60)

{

   IF (score ≥ 80)

   {

      DISPLAY("Distinction")

   }

   ELSE

   {

      DISPLAY("Merit")

   }

}
ELSE

{

   DISPLAY("Fail")

}

What is displayed when this code segment is executed?

  • Distinction

  • Merit

  • Fail

  • Nothing is displayed

Choose your answer

6
1 mark

Consider the following code segment.

x ← 12

IF (x > 5)

{

   DISPLAY("P")

}
IF (x > 10)

{

   DISPLAY("Q")

}
IF (x > 15)

{

   DISPLAY("R")

}

What is displayed when this code segment is executed?

  • P and Q

  • P only

  • Q only

  • P, Q, and R

Choose your answer

7
1 mark

Consider the following code segment.

n ← 10

REPEAT UNTIL(n < 4)

{

   DISPLAY(n)

   n ← n - 3

}

What is displayed when this code segment is executed?

  • 10 7 4 1

  • 10 7

  • 10 7 4

  • 7 4 1

Choose your answer

8
1 mark

Consider the following code segment.

x ← 5

REPEAT UNTIL(x = 0)

{

   DISPLAY(x)

   x ← x + 1

}

What is the result of executing this code segment?

  • The loop runs infinitely

  • 5

  • 5 4 3 2 1

  • Nothing is displayed

Choose your answer

9
1 mark

Consider the following code segment.

nums ← [4, 7, 2, 9]

count ← 0

FOR EACH n IN nums

{

   IF (n > 3)

   {

      count ← count + 1

   }

}

DISPLAY(count)

What is displayed when this code segment is executed?

  • 1

  • 2

  • 3

  • 4

Choose your answer

1
1 mark

The code segment is intended to display the largest of three distinct values a, b, and c, but it does not always work.

IF(a > b)

{

   DISPLAY(a)

}
ELSE

{

   DISPLAY(b)

}

Which set of initial values shows that the code does not work as intended?

  • a = 1, b = 2, c = 3

  • a = 3, b = 2, c = 1

  • a = 2, b = 1, c = 0

  • a = 5, b = 4, c = 1

Choose your answer

2
1 mark

Consider the following code segment, where n is a positive integer.

IF (n MOD 3 = 0)

{

   IF (n MOD 2 = 0)

   {

      DISPLAY("Both")

   }

   ELSE

   {

      DISPLAY("Three only")

   }

}
ELSE

{

   DISPLAY("Neither")

}

For which value of n will the code segment display "Three only"?

  • 12

  • 8

  • 6

  • 9

Choose your answer

3
1 mark

Consider the following code segment.

count ← 8

REPEAT UNTIL(count > 5)

{

   DISPLAY(count)

   count ← count + 1

}

DISPLAY("Done")

What is displayed when this code segment is executed?

  • 8 Done

  • The loop runs infinitely

  • 8

  • Done

Choose your answer