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# CSI3140 ASSIGNMENT 3

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CSI3140
ASSIGNMENT 3
Due Date: Upload your completed assignment file (in .zip format) to this course
website (on Virtual Campus – Brightspace) by 01:00 PM on Monday, June 28, 2021.
Instructions:
• This assignment has 4 pages and must be done individually. It consists of 6
questions with the mark for each question indicated below, resulting in 75 marks in
total.
• Late assignments will NOT be accepted: They will receive a grade of zero.
• Save your answer to each question in a separate file (or a set of files) and name it (or
them) using the following format:
AssignmentNo_QuestionNo_YourLastName_YourStudentID
For example, John Smith, whose student ID is 1234567, should save his answer to
Question 1 in an HTML file named: A3_Q1_Smith_1234567.html, and save his
solution to Question 4 (consisting of 3 files) under the file names:
A3_Q4_Smith_1234567.html, A3_Q4_Smith_1234567.js, and
A3_Q4_Smith_1234567.css
• Create a cover page in Word (or PDF) format containing your full name, student ID,
course number, and assignment number. Name your cover page as
A3_CoverPage_YourLastName_YourStudentID.docx (or .pdf).
• Zip all your answer files together with your cover page into a single .zip file and
name it A3_YourLastName_YourStudentID.zip, and upload that .zip file to this course
website by the due time and date above.
The following questions require JavaScript programming. Your code should be well
written (e.g., variables declared, meaningful variable names, easy to understand and no
confusing shortcuts, meaningful functions, and useful comments, etc.).

1. Implement the following functions:
a) Function celsius returns the Celsius equivalent of a Fahrenheit temperature,
using the calculation: C = 5.0 / 9.0 * (F – 32)
b) Function fahrenheit returns the Fahrenheit equivalent of a Celsius
temperature, using the calculation: F = 9.0 / 5.0 * C + 32
c) Use these functions to write a script (embedded in an HTML5 document) that
enables the user to enter either a Fahrenheit or a Celsius temperature and
displays the Celsius or Fahrenheit equivalent.
Your HTML5 document should contain two buttons – one to initiate the conversion
from Fahrenheit to Celsius and one to initiate the conversion from Celsius to
Fahrenheit. [10 marks]
2. Write a script (embedded in an HTML5 document) that plays a “guess the number”
game as follows: Your program chooses the number to be guessed by selecting a
random integer in the range from 1 to 1000. The script displays the prompt “Guess a
number between 1 and 1000” next to a text field. The player types a first guess into
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the text field and clicks a button to submit the guess to the script. If the player’s guess
is incorrect, your program should display “Too high. Try again.” or “Too low. Try
again.” to help the player zero in on the correct answer. When the user enters the
correct answer, display “Congratulations. You guessed the number!”. [10 marks]
3. Modify your solution to Question 2 above to count the number of guesses the player
makes. If the number is fewer than 10, display “Either you know the secret or you got
lucky!”. If the player guesses the number in 10 tries, display “Ahah! You know the
secret!”. If the player makes more than 10 guesses, display “You should be able to do
better!” In addition, handle incorrect input: If the player’s input is not a number,
display “Wrong input! You should enter a number between 1 and 1000.” and do not
count that guess. [10 marks]
4. A prime integer is an integer greater than 1 that is evenly divisible only by itself and
1. The Sieve of Eratosthenes is an algorithm for finding prime numbers. It operates as
follows:
a) Create an array with all elements initialized to 1 (true). Array elements with
prime indices will remain as 1. All other array elements will eventually be set
to zero.
b) Set the first two elements to zero because 0 and 1 are not primes. Starting with
array index 2, every time an array element is found whose value is 1, loop
through the remainder of the array and set to zero every element whose index
is a multiple of the index for the element with value 1. For example, for array
index 2, all elements beyond 2 in the array that are multiples of 2 will be set to
zero (i.e., indices 4, 6, 8, 10, etc.); for array index 3, all elements beyond 3 in
the array that are multiples of 3 will be set to zero (i.e., indices 6, 9, 12, 15,
etc.); and so on.
When this process is complete, the array elements that are still set to 1 indicate that
their indices are prime numbers. These indices can be printed. Write a script (in a .js
file separate from the HTML5 document) that uses an array of 1000 elements to
determine the number of the prime numbers between 1 and 999 and output these
prime numbers. Ignore element 0 of the array. Your CSS rules (if any) should also be
placed in a separate .css file from the HTML5 document. [10 marks]
5. You will use random number generation to develop a simulation for the classic race
of the tortoise and the hare. The contenders begin the race at square 1 of 70 squares.
Each square represents a possible position along the race course. The finish line is at
square 70. The first contender to reach or pass square 70 is rewarded with a pail of
fresh carrots and lettuce. The course weaves its way up the side of a slippery
mountain, so occasionally the contenders lose ground. Assume that there is a clock
that ticks once per second. With each tick of the clock, your script should adjust the
position of the animals according to the rules in Table 1 below:
Animal Move type Percentage of time Actual move
Tortoise Fast plod 50% 3 squares to the right
Slip 20% 6 squares to the left
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Slow plod 30% 1 square to the right
Hare Sleep 20% No move at all
Big hop 20% 9 squares to the right
Big slip 10% 12 squares to the left
Small hop 30% 1 square to the right
Small slip 20% 2 squares to the left
Table 1: Rules for adjusting the position of the tortoise and the hare
Use variables to keep track of the positions of the animals (i.e., position numbers are
1 – 70). Start each animal at position 1. If an animal slips left before square 1, move
the animal back to square 1. Generate the percentages in Table 1 by producing a
random integer i in the range 1 ≤ i ≤ 10. For the tortoise, perform a “fast plod” when
1 ≤ i ≤ 5, a “slip” when 6 ≤ i ≤ 7, and a “slow plod” when 8 ≤ i ≤ 10. Use a similar
technique to move the hare.
Provide a button labeled “Start Race”, on which the user clicks to start the race. Begin
the race by printing:
BANG!!!
AND THEY’RE OFF!!!
Then for each tick of the clock (i.e., each repetition of a loop), print a 70-position line
showing the letter T in the position of the tortoise and the letter H in the position of
the hare. Occasionally, the contenders will land on the same square. In this case, the
tortoise bites the hare, and your script should print OUCH!!! at that position. All print
positions other than the T, the H, or the OUCH!!! should be blank.
After each line is printed, test whether either animal has reached or passed square 70.
If so, print the winner and terminate the simulation. If the tortoise wins, print
TORTOISE WINS!!! YAY!!! If the hare wins, print HARE WINS. YUCK! If both
animals win on the same tick, print IT’S A TIE. Also, print the time elapsed (the
number of ticks) of the race. If neither animal wins, perform the loop again to
simulate the next tick of the clock. Separate your script (.js file) and your CSS rules
(.css file – if any) from the HTML5 file.
Note: Later in the book, we introduce a number of Dynamic HTML capabilities, such
as graphics, images, animation and sound. As you study those features, you may
enjoy enhancing your tortoise-and-hare contest simulation. [20 marks]
6. Write a script that encodes English-language phrases in pig Latin. Pig Latin is a form
of coded language often used for amusement. Many variations exist in the methods
used to form pig Latin phrases. For simplicity, use the following algorithm:
To form a pig Latin phrase from an English-language phrase, tokenize the phrase into
an array of words using String method split. To translate each English word into a pig
Latin word, place the first letter of the English word at the end of the word and add
“ay”. Thus, the word “jump” becomes “umpjay”, the word “the” becomes “hetay”,
and the word “computer” becomes “omputercay”. Blanks between words remain as
blanks. Assume the following: The English phrase consists of words separated by
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blanks, there are no punctuation marks, and all words have two or more letters. Your
script should include function printLatinWord, which displays each pig Latin word.
Each token (i.e., word in the sentence) is passed to function printLatinWord to print
the corresponding pig Latin word. Enable the user to input the sentence through an
HTML5 form. Keep a running display of all the converted sentences in an HTML5
textarea. Separate your script from the HTML5 document. [15 marks]