Assignment 3 Object Oriented Programming with Ruby


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Engineering COMP 348: Principles of Programming
Assignment 3
Evaluation: 100 pts
I. Object Oriented Programming with Ruby:
1. (10 pts) Write a Ruby method that takes an array of strings as an argument, sorts it
alphabetically, iterates and uses a code block to display each string element along with its
characters count. For example, if passing the following argument array
[“Adam”,”Eve”,”Mark”,”Franklin”,”John”], then the output should be:
Adam, ch_count= 4
Eve, ch_count= 3
Franklin, ch_count= 8
John, ch_count= 4
Mark, ch_count= 4
2. (20 pts) Automated Readability Index (ARI) is used for testing readability in English text.
The mathematical formula for calculating ARI in a text document is as follows:
𝐴𝑅𝐼 = 4.71 × (𝑐ℎ𝑎𝑟𝑎𝑐𝑡𝑒𝑟𝑠/𝑤𝑜𝑟𝑑) + 0.5 × (𝑤𝑜𝑟𝑑𝑠/𝑠𝑒𝑛𝑡𝑒𝑛𝑐𝑒) − 21.43
𝑐ℎ𝑎𝑟𝑎𝑐𝑡𝑒𝑟𝑠 = ∑ 𝑙𝑒𝑡𝑡𝑒𝑟𝑠, 𝑛𝑢𝑚𝑏𝑒𝑟𝑠 𝑎𝑛𝑑 𝑝𝑢𝑛𝑐𝑡𝑢𝑎𝑡𝑖𝑜𝑛
𝑤𝑜𝑟𝑑𝑠 = ∑ 𝑠𝑝𝑎𝑐𝑒𝑠
𝑠𝑒𝑛𝑡𝑒𝑛𝑐𝑒𝑠 = ∑ 𝑓𝑢𝑙𝑙 𝑠𝑡𝑜𝑝𝑠
The following table shows the educational grade level that corresponds to each ARI
COMP 348_Winter 2021 – Assignment 3 2
Score Age Grade Level
1 5-6 Kindergarten
2 6-7 First/Second Grade
3 7-9 Third Grade
4 9-10 Fourth Grade
5 10-11 Fifth Grade
6 11-12 Sixth Grade
7 12-13 Seventh Grade
8 13-14 Eighth Grade
9 14-15 Ninth Grade
10 15-16 Tenth Grade
11 16-17 Eleventh Grade
12 17-18 Twelfth grade
13 18-24 College student
14 24+ Professor
Write a Ruby method that can read any document file, count number of characters,
words, and sentences and then apply the ARI formula to find out the grade level required
for a person to read the opened document. For example, for the following “paragraph.txt”
After the Lord Stanley of Preston was appointed by Queen Victoria as Governor
General of Canada on June 11, 1888, he and his family became highly
enthusiastic about ice hockey. Stanley was first exposed to the game at Montreal’s
1889 Winter Carnival, where he saw the Montreal Victorias play the Montreal
Hockey Club. The Montreal Gazette reported that he “expressed his great delight
with the game of hockey and the expertise of the players”. During that time,
organized ice hockey in Canada was still in its infancy and only Montreal and
Ottawa had anything resembling leagues.
A Ruby method call: calcARI(“paragraph.txt”) should output the following:
Total # of characters: 474
Total # of words: 96
Total # of sentences: 4
Automated Readability Index: 13.8
Grade level: 18-24 (college student)
COMP 348_Winter 2021 – Assignment 3 3
3. (30 pts) In this question, you should create an auto showroom inventory catalogue using
Ruby. Your program should read a car listings file which contains all available inventory
details where each line contains the following 11 listing features:
#km, type, transmission, stock#, Drivetrain, Status, Fuel Economy, car_maker,
model, year, Trim,set_of_features
examples of listing lines as follows:
Heated Seats, Heated Mirrors, Keyless Entry},2010
coupe,1100km,auto,RWD, Mercedec,CLK,LX ,18FO724A,2017,{AC, Heated
Seats, Heated Mirrors, Keyless Entry, Power seats},6L/100km,Used
Seats, Heated Mirrors, Keyless Entry}
Note: order of listing features varies from one line to another as it was entered by
employees not trained for proper data entry. Also, assume the following listing feature
possible values (case insensitive):
Listing features Values
#km Kilometers followed by “km”
Type {Sedan, coupe, hatchback, station, SUV}
Transmission {Auto, manual, steptronic}
stock# Combination of letters and numbers NOT ending with “km”
Drivetrain {FWD,RWD,AWD}
Status {Used, new}
Fuel Economy Similar to: 5.5L/100km format
car_maker {Honda, Toyota, Mercedes, BMW, Lexus}
Model Any text that doesn’t match any of the other criteria in this table
Year Any year
Trim any two letters acronym
set_of_features Any set of features inside curly parenthesis
Your program should have four methods as follows:
• convertListings2Catalougue: a method that:
o reads the listings file line by line
o correctly recognizes and extracts different listing features
o instantiates appropriate objects of different classes and subclasses that you
should define to hold the listing information for different car makers, their
models and trim lines available in our listings. Any parent class should
have properties that count the number of listings of that maker or that
COMP 348_Winter 2021 – Assignment 3 4
model along with other common behavior or properties. In the listings
examples above, you can create an object of class (car_model) and store
all the listing information in that class and also update the parent
(car_maker) common class properties accordingly.
Note: The OOP design and choice of classes and subclasses is something
that differs from one programmer to another and depends on the way you
look at the problem.
• searchInventory: a search method that accepts a hash as its argument and based on
the combination of hash key-value pairs will perform an advanced search for all
vehicles in stock that matches the criteria. For example, searchInventory(
{“car_maker” => ”Mercedes”}) should display all Mercedes vehicles available.
• Add2Inventory: a method that accepts a new listing as a single line of unordered
listing features, add the line to the original listing file and add an appropriate
object to the catalogue based on the listing features.
• saveCatalogue2File: a method that traverses all created catalogue objects and
stores them to an output file alphabetically according to their maker name. each
listing features will follow a strict fixed order as opposed to the original file
random order. For example, the original three listings will look as follows in the
output file:
Toyota,camry,SE,65101km,2010, Sedan, FWD, Manual, 18131A,
Used,5.5L/100km, {AC, Heated Seats, Heated Mirrors, Keyless Entry}
Mercedec,CLK,LX, 1100km,2017,coupe, RWD, auto, 18FO724A,
Used,6L/100km,{AC, Heated Seats, Heated Mirrors, Keyless Entry, Power seats}
Honda,CRV,LE,0km, 2018, SUV, AWD, auto, 19BF723A,
new,8L/100km,{Heated Seats, Heated Mirrors, Keyless Entry}
II. Procedural programming with C:
4. (10 pts) write a C function matrixTranspose that takes a two-dimensional array as its
input argument then transposes its elements. Develop it in two steps:
a. First, assume the matrix is a square matrix. This will make finding the transpose a
simple swapping of the arrays’ elements.
b. Second, generalize your function to work with any NxM matrix where N≠M. You
will need to use pointer arithmetic instead inside the function and also properly
handle memory allocation for this purpose.
COMP 348_Winter 2021 – Assignment 3 5
1 2 3
4 5 6
= (
1 4
2 5
3 6
5. (30 pts) Given that C is NOT OOP, so in this question you will try to mimic OOP state of
auto inventory catalogue in Q3 using C structures. Using the ordered output file created
using your Ruby program in Q3, write a C program that uses that output file and works
according to the following description:
a. Creates different structure types that corresponds to different class types that you
created in Q3
b. Each structure will contain a pointer to the next structure of the same type.
c. The top-level structure will additionally contain a pointer to the first structure in
the level below that corresponds to one of the models of that car maker
d. It reads the file and starts populating variables of the corresponding structure type
and updates the linked list pointers accordingly. It will also store different vehicle
listing features in the structures that it just created.
e. You should also create the three functions explained in Q3: searchInventory,
Add2Inventory, saveCatalogue2File. The implementation will be quite different
as you will have to traverse the linked list (multi linked list in our case here) to
find different listing and process them accordingly.
The multi linked list of structures should look like the figure below:


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