AP Computer Science Principles (CSP) Practice Test

What is displayed after running the following algorithm?

What is displayed after running the following algorithm?

What is displayed after running the following algorithm?

In a computer, text is represented by numbers, which are converted into characters using an encoding standard. Two common examples are the American Standard Code for Information Interchange (ASCII) and Extended Binary Coded Decimal Interchange Code (EBCDIC), which correspond the same character to different numbers. A sample of the encoding standards is provided below.

Convert the hexadecimal array {50, 4F, 4B, 4C} to a list of ASCII characters and a list of EBCDIC characters.

Using the table converts the ASCII character “M” to a binary number.

What will the following program display?

Errors in Microsoft Windows are often displayed with hexadecimal error codes. If this number is converted into a decimal, it can be used by certain utilities to diagnose the problem with the computer.

If a stop error (i.e., a “Blue Screen of Death”) returns the error code 0x0000008F, what is the error? (Ignore the “0x” at the start; this is a signal that the number is in hexadecimal.)

How is a string stored in a computer’s memory?

A programmer is proposing to have her debugging program report errors in hexadecimal numbers rather than decimal numbers. Which of the following is a good reason for doing so?

A programmer is planning to make a program that allows a company to organize its employees by name, ID number, and salary. Suppose the programmer is making an abstraction called newEntry that takes in this data to create a new entry.

Which of the following would be a good header for the abstraction?

Why is it best to use an iterative and incremental process of program development?

How many times does the inner loop iterate in the following?
REPEAT x TIMES
{
REPEAT y TIMES
{
<Program statement>
}}

The figure below uses a robot in a grid of squares. The robot is represented as an arrow, which is initially in the bottom-right square of the grid and facing toward the right of the grid. Which of the following algorithms will place the robot in the gray square?

a

What percentage of the time will the following program display an even number?

DISPLAY(RANDOM(1,10))

Where is cloud data stored?

In general, which of the following is NOT an advantage of using computer simulations? Select two answers.

Which of the following describes a lossy transformation of digital data?
I. Compressing an image file into a smaller resolution image so the image can easily be emailed
II. Inverting the colors of an image by subtracting each RGB value from 255
III. Converting an image by averaging its RGB values and assigning the new value to a shade of gray ranging from white to black

Which of the expressions are equivalent to the Boolean expression NOT (num < 13)?

The following are steps data takes as it travels across the internet.
I. Data is chopped into chunks called packets.
II. Packets are reassembled into a coherent message.
III. Packets are routed throughout the internet.
IV. Packets go through internet service providers (ISPs) to access the internet.

Which of the following is the correct path data takes when it travels from one device to another device through the internet?

An algorithm has n number of steps. Which of the following would NOT be considered a reasonable number of steps?

100 n⁴

A student was unable to connect to a website by entering its URL into her web browser. However, she successfully accessed the website by entering its IP address. Which of the following systems was most likely the one that failed when trying to access the website?

Which of the following are benefits to having information be easy to access?
I. Information can be easily found by researchers, which can improve experimental and investigational findings.
II. Information can be easily found by students, who can use it to improve their understanding of a topic.
III. Information can be easily checked by third parties, which ensures that it is always correct and up-to-date.

Most coding languages enable programmers to include a source file in the form of abstractions. For example, in C++, the command #include <iostream> grants the program access to basic input/output commands. Why would such a feature be useful in a language?

Why would a heuristic analysis be useful in an antivirus program?

“Boids” is a flocking algorithm that is used to determine the direction of objects in a moving population. It is built on three principles: Select two answers.

I. Separation: steer to keep local flock mates at a certain distance
II. Alignment: steer toward the average heading
III. Cohesion: steer toward the center of the flock

Suppose that a programmer is creating a method called findBoidHeading that
calculates the heading of an individual boid in the flock. findBoidHeading
takes in a data structure of the other boids in the program.

The following commands are used on Boid objects. Assume that the name is
representative of the function. Which might be useful in findBoidHeading?

A simulation for a coin flip should result in 50% heads and 50% tails. Select two answers that could replace the missing condition. Select two answers.

A program for children is designed to display a math problem and let the user input what he or she believes to be the answer. What data transformations are undergone at the most basic level of the program?

Select two answers.

Why is it more effective to use abstractions in a program than to repeat code? Select two answers.

Which of the following is NOT possible using the RANDOM(a, b) and DISPLAY(expression) abstractions?

Select two answers.

DISPLAY (RANDOM(1, 4) + RANDOM(2, 5))

The algorithm below displays TRUE 60% of the time.

What is the missing condition? Select two answers.

Which of the following are examples of collaborations that have been created through crowdsourcing? Select two answers.

Convert 100001_BIN to a decimal number

Convert 2D_HEX to a decimal number

Order the numbers from lowest to highest.
I. 12_HEX
II. 12_DEC
III. 12_OCT

Order the numbers from highest to lowest.
I. AA_HEX
II. 99_DEC
III. 1111_BIN