ENGG1340 / COMP2113 Assignment 3

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ENGG1340 / COMP2113, Assignment 3

If you have any questions, please post to the Moodle discussion forum on Assignment 1.
• General Instructions
• Problem 1: Large Numbers Addition (50 marks)
• Problem 2: STL – Log Analyzer (45 marks)
Total marks: 100 marks
• 5 marks for proper code comments, indentation and use of functions
• 95 marks for program correctness
A maximum of 5 marks will be deducted if you fail to follow the submission instructions
General Instructions
Read the instructions in this document carefully.
In this assignment you will solve TWO problems and a tester would automatically test your
submitted program. So if your submitted files and program outputs do not conform to our
instructions given here, your programs cannot be evaluated and you will risk losing marks
Sample test cases are provided with each problem in this document. Note that the test cases
may or may not cover all boundary cases for the problem. It is also part of the assessment
whether you are able to design proper test cases to verify the correctness of your program.
We will also use additional test cases when marking your submission.
Input and output format
Note carefully whether your C++ programs should read from the standard input, command
line input or file input. Also, unless specified otherwise, your answer should be printed
through the standard output. If you failed to follow the instructions, the tester may not be
able to give a score for your program. Additionally, you should strictly follow the sample
output format (including space, line breaker, etc.), otherwise, your answer might be
considered as wrong.
How to use the sample test cases
Sample test cases in text file formats are made available for you to check against your work
to avoid formatting errors which might fail the tester. Here’s how you may use the sample test
cases. Take Problem 2 test case 3 as an example. The sample input and the expected output
are given in the files input2_3.txt and output2_3.txt , respectively. Suppose that your
program is named “2”, do the followings at the command prompt of the terminal to check if
there is any difference between your output and the expected output.
./2 < input2_3.txt > myoutput.txt
diff myoutput.txt output2_3.txt
Testing against the sample test cases is important to avoid making formatting
mistakes. The additional test cases for grading your work will be of the same formats as the
sample test cases.
Coding environment
You must make sure that your program can compile, execute and generate the required
outputs on our standard environment, namely, the gcc C++11 environment we have on the
CS Linux servers (academy*).
Make sure the following compilation command is used to compile your programs:
g++ -pedantic-errors -std=c++11 [yourprogram].cpp
As a programmer/developer, you should always ensure that your code can work perfectly as
expected on a target (e.g., your client’s) environment, not only on yours.
While you may develop your work on your own environment, you should always try your
program (compile & execute & check results) on our standard environment before submission.
Name your C++ programs as in the following table and put them together into one directory.
Make sure that the folder contains only these source files ( *.cpp ) and no other files.
Compress this directory as a [uid].zip file where [uid] is your university number and
check carefully that the correct zip file have been submitted. We suggest you to download
your submitted file from Moodle, extract them, and check for correctness. You will risk
receiving 0 marks for this assignment if you submit incorrect files. Resubmission after the
deadline is not allowed.
Problem Code templates provided Files to Submit
1 Create your own 1.cpp 1.cpp
2 2.cpp 2.cpp
Late submission
If submit within 3 days after the deadline, 50% deduction. After that, no mark.
Your code will be auto-graded for technical correctness. In principle, we use test cases to
benchmark your solution, and you may get zero marks for not being able to pass any of the
test cases. Normally partial credits will not be given for incomplete solution, as in many cases
the logic of the programs are not complete and an objective assessment could be difficult.
However, your work may still be considered on a case-by-case basis during the rebuttal
Academic dishonesty
We will be checking your code against other submissions in the class and from the Internet
for logical redundancy. Please be reminded that no matter whether it is providing your work to
others, assisting others to copy, or copying others will all be considered as committing
plagiarism and we will follow the departmental policy to handle such cases. Please refer to
the course information notes for details.
Getting help
You are not alone! If you find yourself stuck on something, post your question to the course
forum. We want this assignment to be rewarding and instructional, not frustrating and
demoralizing. But we don’t know when or how to help unless you ask.
Please be careful not to post spoilers. Please don’t post any code that is directly related to
the assignments to the discussion forums or share your work to any public domain. However
you are welcome and encouraged to discuss general ideas on the discussion forums.
Problem 1: Large Numbers Addition
This problem is an extension of the tutorial problem in Module 8.3 on large number
The largest integer that can be stored using a 32-bit int data type is 2,147,483,647. In this
question, you are going to implement addition of two arbitrarily large numbers using linked
A large integer is to be stored in your program as follows. Starting from the least significant
digit, an integer n is segmented into chunks of 3 digits. The value of the chunk with the least
significant digits is stored in the first node and that of the most significant digits is stored in
the last node, so that the linked list in reverse will give the original integer n. Here are some
• Your program should accept an expression a + b from the user, which is an
addition of two large numbers a and b .
• First two lines of output print the linked list storing the two input large numbers to
be added.
• The third line of output prints the linked linked list storing the sum of the two
• The fourth line of output prints the sum in its conventional form.
• You should assume that the input integers are of arbitrarily number of digits. In
other words, you cannot simply store the input numbers in any integer or string
• You should start with the solution program largenum.cpp of the tutorial problem
and modify the code from there. Then the use of dynamic array to handle the
arbitrary long input would have been done for you.
• Remember to name your submission as 1.cpp .
• Modify the code so it first creates two linked lists for the input numbers, then
performs the addition which creates a third linked list storing the sum.
• Addition is done by adding the values stored in the nodes of the two linked lists
that correspond to the same decimal places, and propagating the carry digit (if
there is any) to the addition of the next nodes storing the value of the more
significant digits.
• You are not allowed to use STL containers (e.g., vectors) or other external
• You may add your own functions wherever appropriate for better program
• You are allowed to reuse/modify functions in the sample programs
build_list_forward.cpp , build_list_backward.cpp ,
build_list_sorted.cpp , build_list_reverse.cpp and largenum.cpp of
Module 8.3 whenever appropriate.
Sample Test Cases
User inputs are shown in blue.
12345678 + 1009
678 -> 345 -> 12 -> NULL
9 -> 1 -> NULL
687 -> 346 -> 12 -> NULL
999999999 + 99
999 -> 999 -> 999 -> NULL
99 -> NULL
98 -> 0 -> 0 -> 1 -> NULL
12345678 + 21474000083647
678 -> 345 -> 12 -> NULL
647 -> 83 -> 0 -> 474 -> 21 -> NULL
325 -> 429 -> 12 -> 474 -> 21 -> NULL
Problem 2: STL – Log Analyzer
You are provided with a template program 2.cpp . Complete the program and the program
will read and process a web log data file from user input ( cin ). The program will then print
out the 5 most popular pages, and the 5 most active users and the corresponding pages they
have visited.
The log file consists of records of three types, each record occupies exactly one line. Here is
the format of these three types of record:
Page record: PAGE <page id> <page url>
User record: USER <user id>
Visiting record: VISIT <page id>
A page record represents a page on the web server. A user record represents a user that
accesses the system. A visiting record represents a visit by the user indicated by the most
recent user record. Here is a sample data file:
PAGE 1288 /library
PAGE 1282 /home
USER 20686
VISIT 1288
VISIT 1282
USER 20687
VISIT 1288
In this case, we have 2 pages ( /library and /home ) on the server. Two users have
accessed the server, one (#20686) visiting 2 pages ( /library and /home ) and the other
(#20687) visiting 1 page ( /library ).
You can assume the followings regarding the data file:
• The data file always consists of the three types of records only
• The page ids are unique across all PAGE records
• The user ids are unique across all USER records
• The page ids are unique across all VISIT records of a user
• VISIT records will only appear after the first USER record
• The page id in a VISIT record appears only after its corresponding PAGE record
• There will be at least 5 users and 5 pages
The followings have been implemented for you:
• A Page structure, each Page object consists of the id, path and a counter to
count the number times it is being visited
struct Page {
int id;
string path;
int counter;
Page(int id, string path) {
this->id = id;
this->path = path;
counter = 0;
• A STL vector for organizing the Page objects
vector<Page> pages;
• A User structure, each User object consists of the id and the pages the user
struct User {
int id;
vector<string> visits;
User(int id) {
this->id = id;
void add_visit(int page_id) {

int size() const {
return visits.size();
void print_visits() {

• A STL vector for organizing the User objects
vector<User> users;
• A function to overload < operator for the comparison of 2 pages based on their
bool operator<(const Page & a, const Page & b) {
return ( <;
You are required to complete the missing functions in the template program to make it work.
Note: The functions Page() and User() in the structs Page and User above are called
struct constructors. Refer to Module 10 “C Programming (Part 3)” for the discussion on the
struct constructor functions. It works the same in C++.
Sample Test Cases
You are provided with 4 sample test cases. We will use the first test case and detail the test
run below.
Assume we have input2_1.txt in the current directory. If we run the program like this
(assuming that we are working on Linux):
$ g++ -pedantic-errors -std=c++11 2.cpp -o 2
$ ./2 < input2_1.txt
The program will print:
*** 5 most popular pages ***
*** 5 most active users ***
– /activeplatform
– /activex
– /automap
– /frontpage
– /gallery
– /ie
– /intdev
– /isapi
– /java
– /msdownload
– /musicproducer
– /office
– /promo
– /sbnmember
– /search
– /sitebuilder
– /spain
– /vbasic


– /athome
– /clipgallerylive
– /games
– /isapi
– /kb
– /logostore
– /msdownload
– /msoffice
– /ntserver
– /products
– /search
The output format is explained as the below:
• Each line of the “5 most popular pages” is in the format of
“visit_counter:page_path”. E.g., 36:/msdownload .
• A line of an active user is in the format of “number_of_pages_visisted:user_id”.
E.g., 23:10068 .
• A line of an active user’s visit is in the format of “- page_path”. E.g.,
– /activeplatform .
• If two pages are equally popular, the pages are ordered lexicographically by the
• If two users visit the same number of pages, the users are ordered by their id
• The list of pages a user visit must be printed in lexicographical ascending order.
• You can choose not to use the provided template program and implement in your
own way. However, your program must contain the provided Page and User
structures and use STL vectors for storage.
• Once again, you MUST use STL vectors in your program. Your program will be
checked and your score will be 0 if we find that you use traditional arrays to store
pages and users in your implementation.

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