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日期:2020-11-13 11:40

CS 170 ± Exam 2 Sample Questions

Additional Information

Date and Time

The exam will be open on Canvas Wednesday, November 11th 7:00am ET – Thursday, November 12th ,

7:00am ET.

Content

Material Covered in Exam 2:

Chapter 6, 10 (Algorithmic Thinking - (Flowcharts and Pseudocode)

Chapter 17 & 18 (JavaScript - Intro. & Event-Driven)

Chapter 19 (JavaScript - Functions)

Chapter 20 (JavaScript ± Arrays and Loops)

Sources

Review information from Lectures, Textbook (items related to the list of topics), Recitations and

Assignments. Refer to MODULES TOOL Reading and Resources for weeks 5 ± 8 inclusive,

assignments 5 ± 8, quizzes from weeks 7 ± 10.

Format

The format of the exam can include True/False questions, Multiple Choice questions, Short Answer

questions, interpretation of HTML/JavaScript coding (both understanding the logic flow and/or finding

syntax errors) and generating code to resolve an outlined problem.

Other requirements

x Pay attention to announcements through Canvas!!!

x Read all announcements and emails from your instructors and TAs.

Sample Questions

These example questions are intended to provide the student with a method to practice for the actual

exam. It is not intended to represent the limit of the material the student is expected to know. The

student is responsible for understanding the textbook concepts (as listed in the Topics Covered

document), Lectures, Recitations and Assignments.

2

Part 1 – Algorithmic Thinking (Ch. 10)

1.1) A. An algorithm is a(n)

A: list of general nonspecific steps to produce an output

B: logarithm

C: systematic method for producing a specified result

D: math problem

B Algorithms must always

A. produce output

B. produce output or state that there is no solution

C. produce input or state that there is no solution

D. state that there is no solution

1.2) Create a flowchart based on the following pseudocode:

start

create a random number between 1 and 100

input a guess for the random number generated

if the guess equals the random number

then

display a message of congratulations

else

if the guess is lower than the random number

then

display a messaging that guess is too low

else

display a message that the guess is too high

endif

endif

stop

3

Part 2 - JavaScript Intro. & Event-Driven

2.1) Follow each subproblem instructions.

a. For each of the following variables, correct only those which are not legally declared.

A: rumpelstinski% ____________________

B: tax Season ____________________

C: #FreddyKrueger ____________________

D: 123Jump! ____________________

b. Express in code the following instruction:

3If Whe Yariable age is greaWer Whan 21, displa\ an alerW Zhich displa\s: Access GranWed!3

2.2) Express the following mathematical expression as a single legal Javascript statement.

To calculate compound Interest, one uses the formula P * (1 + r/n) nt

Write this formula using JavaScript.

[Note: the star (*) indicates a multiplication] You can use the built-in function

Math.pow(base,exponent) [Example: the result of Math.pow(5,2) is 25] .

var P, r, n, t;

var compoundInterest = _____________________________

4

2.3)

Match the output of the built-in functions listed down with the corresponding letter from the left side.

a.

A. Math.round(2.73) ___ 2

B. Math.random() ___ 2.73

C. Math.floor(2.73) ___ 0.73

D. document.write("2.73") ___ 3

For the following questions, indicate your answer by drawing a circle around the letter corresponding to

your choice.

b. The relational test, (revenue > 15000 && revenue < 50000) is ________.

A. true if revenue is 20000

B. true if revenue is less than 50000

C. false if revenue is greater than 15000

D. none of the above

c. When defining a variable, you must also initialize it on the same line.

A. True

B. False

5

2.4) Write the HTML which will produce the following page:

● Assume you are already writing code inside the <body> tags (you do NOT need to write

<!DOCTYPE html> etc.

● Radios must be of the name-groXp 3radios′. The firsW one, has id ′gold′ Zhile Whe second one

mXsW haYe id 3plaWinXm′

● The register button must call a function called registerUser() when clicked. You do not need to

write the JavaScript code for the function, or the calculation.

● Define a button eYenW lisWener in Whe 3RegisWer′ inpXW \oX creaWe, Zhich on click, will pass the

values of the userName and email input boxes to a function called registerUser

<body>

</body>

6

2.5) Evaluate the following Conditional Tests and determine the outcome when:

a = 3PLcKaHO′, b = 3MRUGaQ′, c = 23, G = 15

a.

(a == 3manX′ __ c == 3ginobili′ __ b == 3jordan′ )

a. TRUE

b. FALSE

b.

(b == 15 && d > 15) || (c != 23)

a. TRUE

b. FALSE

c.

(c % 15 != 0 || (a+b).length > 2)

a. TRUE

b. FALSE

d.

(true || false && (true && true))

a. TRUE

b. FALSE

7

Part 3 – JavaScript Functions

3.1) Write a function which converts Kelvin degrees into Fahrenheit degrees and returns the result. The

function should use a single parameter for the Kelvin degrees. The mathematical formula is:

F = K * 9/5 í 459.67 where F: Fahrenheit and K: Kelvin.

3.2) Write a function that calculates and returns the final price of a product. The function should have

two parameters: one for the initial price and another for the tax.

The mathematical formula to be used is:

Final Price = Initial Price x (1 + Tax)

3.3) Given the following code:

var a=1,b=3,c=4;

var d;

d = calcNow(a, b, c);

function calcNow(x, y, z) {

var a, b;

a = x - 1;

b = y + 3;

c = a + b;

return a + b -c;

}

Calculate the final value of:

a ________ b ______ c ______ d ____

8

Part 4 – JavaScript Arrays and Loops

4.1) Given this array: var cars = new Array(9); which of the following is a valid way of accessing a value

within the array.

A. cars[9]

B. cars[7.5]

C. cars[0]

D. cars[10]

4.2) Express following instructions in code: Given an array:

var myArray = new Array(3Whe′, 3big′, 3bad′, 3Zolf′);

a. Using the alert function, display the number of elements that array myArray contains:

b. Change the value of the last two elements of the array with the values 3red′ 3balloon′

c. Using a loop, display each element of the array from 0 to the end.

4.3) Express following instructions in code: Given an array:

var hoursWorked = new Array(7,0,6,9,4,10,10);

a. Write a JavaScript function, getTotal, that takes one array parameter and returns the sum of

the values in the array. For example, the statement

var sum = getTotal(hoursWorked) would assign the value 46 to the variable sum.

b. Write a JavaScript function, getHigh, that takes one array parameter and returns the largest

of the values in the array. For example, the statement

var large = getHigh(hoursWorked) would assign the value 10 to the variable large.

c. Write a JavaScript function, countZeros, that takes one array parameter and returns the

number of the values in the array that are equal to 0. For example, the statement

var numZeros = countZeros(hoursWorked) would assign the value 1 to the variable

numZeros.


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