Q1.1: A subsystem is a smaller, self-contained unit within a larger system that performs specific functions or tasks. Q1.2: The Systems Development Life Cycle (SDLC) is a structured approach to software development
Q1.1: A subsystem can be defined as a self-contained unit within a larger system that performs specific functions or tasks. It is an organized component that contributes to the overall functioning of the system. Dividing an information system into subsystems is important for several reasons. Firstly, it allows for modular design, where different subsystems can be developed and maintained independently. This improves manageability and flexibility, as changes or updates in one subsystem do not necessarily impact others.
Secondly, dividing a system into subsystems enables efficient development and maintenance. Development teams can work on different subsystems simultaneously, speeding up the overall development process. Maintenance tasks can also be focused on specific subsystems, ensuring quick and targeted updates or bug fixes. A real-life example of a system with subsystems is an online shopping platform. It typically includes subsystems for inventory management, payment processing, order fulfillment, and customer support, each responsible for specific functions.
Q1.2: The purpose of the Systems Development Life Cycle (SDLC) is to provide a structured and systematic approach to software development. It encompasses various stages, including planning, analysis, design, implementation, and maintenance of a system. The first two core processes of the SDLC, requirements gathering and system analysis, are of utmost importance.
Requirements gathering involves identifying and documenting the needs and expectations of stakeholders, such as users and clients. This process ensures a clear understanding of the system's objectives, features, and functionalities. System analysis, on the other hand, involves examining the existing system, identifying problems or inefficiencies, and proposing potential solutions.
Through careful analysis, developers gain insights into the system's requirements, constraints, and user expectations. These initial processes lay the foundation for the entire development process, guiding subsequent stages such as system design, coding, testing, and deployment. Effective requirements gathering and system analysis ensure that the development team has a clear understanding of the project scope and user needs, leading to the development of a successful and effective system.
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1 include
2 #include «stdlib.h
3
5
6
4 struct coordinate
int x;
int y;
7);
8
9// Return the total number of coordinates where the y coordinate is a
10 // multiple of the x coordinate
11 int count multiple(int size, struct coordinate array[size]) {
112
//TODO: Insert your code in the function here and don't forget to change
I 13
// the return!
14
return 42:
(15 }
16
17 // This is a simple main function which could be used
18 // to test your count multiple function.
19 // It will not be marked.
20 // Only your count multiple function will be marked.
121
22 #define TEST ARRAY SIZE 5
23
(24 int main(void) (
25
struct coordinate test array[TEST ARRAY SIZE] = {
26
{ .x = 3, .y = 20},
27
{
.x = 10,
.y = 20},
128
{.x = 3,
. Y
= 30}.
129
{ .x = 20,
.y = 10},
30
{
.X = 5, .y = 50}
131
132
133
1:
return 0:
printf ("Total of coords where y is multiple of x is gd\n", count multiple(TEST ARRAY SIZE, test array)) ;
34 }
the corrected code with proper formatting and syntax:
```cpp
#include <stdio.h>
#include <stdlib.h>
struct coordinate {
int x;
int y;
};
// Return the total number of coordinates where the y coordinate is a
// multiple of the x coordinate
int count_multiple(int size, struct coordinate array[]) {
int count = 0;
for (int i = 0; i < size; i++) {
if (array[i].y % array[i].x == 0) {
count++;
}
}
return count;
}
// This is a simple main function which could be used
// to test your count_multiple function.
// It will not be marked.
// Only your count_multiple function will be marked.
#define TEST_ARRAY_SIZE 5
int main(void) {
struct coordinate test_array[TEST_ARRAY_SIZE] = {
{ .x = 3, .y = 20 },
{ .x = 10, .y = 20 },
{ .x = 3, .y = 30 },
{ .x = 20, .y = 10 },
{ .x = 5, .y = 50 }
};
printf("Total of coords where y is a multiple of x is %d\n", count_multiple(TEST_ARRAY_SIZE, test_array));
return 0;
}
```
1. Line 1: The `stdio.h` library is included for the `printf` function, and the `stdlib.h` library is included for standard library functions.
2. Line 4-6: The structure `coordinate` is defined with `x` and `y` as its members.
3. Line 11-15: The `count_multiple` function takes the size of the array and the array of coordinates as parameters. It iterates over each coordinate and checks if the `y` coordinate is a multiple of the `x` coordinate. If true, it increments the `count` variable.
4. Line 24-35: The `main` function creates an array of coordinates `test_array` and calls the `count_multiple` function with the array size and the array itself. It then prints the result.
The `count_multiple` function counts the number of coordinates in the array where the `y` coordinate is a multiple of the `x` coordinate and returns the count. In the provided example, it will output the total number of coordinates where `y` is a multiple of `x`.
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Design a relational database system using appropriate design
tools and techniques, containing at least four interrelated tables,
with clear statements of user and system requirements.
A relational database system is designed using appropriate tools and techniques to meet the user and system requirements. It consists of four interrelated tables, which facilitate efficient storage, retrieval, and manipulation of data.
The relational database system is built to address the specific needs of users and the underlying system. The design incorporates appropriate tools and techniques to ensure data integrity, efficiency, and scalability. The system consists of at least four interrelated tables, which are connected through well-defined relationships. These tables store different types of data, such as user information, product details, transaction records, and inventory data. The relationships between the tables enable effective data retrieval and manipulation, allowing users to perform complex queries and generate meaningful insights. The design of the database system considers the specific requirements of the users and the system to ensure optimal performance and usability.
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Consider a network with IP address 192.168.10.1/26, now find, (a) Calculate the number of subnets and valid subnets. (b) What are the valid hosts per subnet? (c) Broadcast address? (d) Valid hosts in each subnet.
To answer the questions, let's analyze the given IP address and subnet mask:
IP address: 192.168.10.1
Subnet mask: /26
The subnet mask "/26" indicates that the first 26 bits of the IP address represent the network portion, and the remaining 6 bits represent the host portion.
(a) Number of subnets and valid subnets:
Since the subnet mask is /26, it means that 6 bits are reserved for the host portion. Therefore, the number of subnets can be calculated using the formula 2^(number of host bits). In this case, it's 2^6 = 64 subnets.
The valid subnets can be determined by incrementing the network portion of the IP address by the subnet size. In this case, the subnet size is 2^(32 - subnet mask) = 2^(32 - 26) = 2^6 = 64.
So the valid subnets would be:
192.168.10.0/26
192.168.10.64/26
192.168.10.128/26
192.168.10.192/26
(b) Valid hosts per subnet:
Since the subnet mask is /26, it means that 6 bits are used for the host portion. Therefore, the number of valid hosts per subnet can be calculated using the formula 2^(number of host bits) - 2, where we subtract 2 to exclude the network address and the broadcast address.
In this case, the valid hosts per subnet would be 2^6 - 2 = 64 - 2 = 62.
(c) Broadcast address:
To calculate the broadcast address, we take the network address of each subnet and set all host bits to 1. Since the host bits in the subnet mask are all 0, the broadcast address can be obtained by setting all the bits in the host portion to 1.
For example, for the subnet 192.168.10.0/26, the broadcast address would be 192.168.10.63.
(d) Valid hosts in each subnet:
To determine the valid hosts in each subnet, we exclude the network address and the broadcast address. In this case, each subnet has 62 valid hosts.
So, in summary:
(a) Number of subnets: 64
Valid subnets: 192.168.10.0/26, 192.168.10.64/26, 192.168.10.128/26, 192.168.10.192/26
(b) Valid hosts per subnet: 62
(c) Broadcast address: 192.168.10.63 (for each subnet)
(d) Valid hosts in each subnet: 62
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Create a python file
On line 1, type a COMMENT as follows: submitted by Your Last Name, First Name
When the program is run, the user is asked: "Enter 1 for Sum of Years Digit Depreciation or 2 or for Double Declining Balance"
The response from the user is an integer of 1 or 2.
Next, ask the user for relevant input: cost, salvage value and useful life of asset. Cost and Salvage Value may be decimal numbers. Useful Life must be an integer.
Finally, you will display the appropriate depreciation schedule on the screen.
You will give your schedule a title of either: Sum of Years Digit Depreciation or Double Declining Balance Depreciation.
You will print out to screen as follows using the FOR loop:
Year # depreciation is: XXX. The Accumulated Depreciation is: YYY. The Book Value of the asset is: ZZZ.
Open
Ask the user for the depreciation method
dep_method = int(input("Enter 1 for Sum of Years Digit Depreciation or 2 for Double Declining Balance: "))
Ask the user for relevant input
cost = float(input("Enter the cost of the asset: "))
salvage_value = float(input("Enter the salvage value of the asset: "))
useful_life = int(input("Enter the useful life of the asset (in years): "))
Calculate the total depreciation
total_depreciation = cost - salvage_value
Print the appropriate title
if dep_method == 1:
print("Sum of Years Digit Depreciation Schedule")
else:
print("Double Declining Balance Depreciation Schedule")
Print the headers for the schedule
print("{:<10} {:<20} {:<25} {}".format("Year #", "Depreciation", "Accumulated Depreciation", "Book Value"))
Calculate and print each year's depreciation, accumulated depreciation, and book value
for year in range(1, useful_life + 1):
if dep_method == 1:
fraction = (useful_life * (useful_life + 1)) / 2
remaining_life = useful_life - year + 1
depreciation = (remaining_life / fraction) * total_depreciation
else:
depreciation = (2 / useful_life) * (cost - salvage_value)
accumulated_depreciation = depreciation * year
book_value = cost - accumulated_depreciation
print("{:<10} ${:<19.2f} ${:<24.2f} ${:.2f}".format(year, depreciation, accumulated_depreciation, book_value))
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When we create an object from a class, we call this: a. object creation b. instantiation c. class setup d. initializer
When we create an object from a class, it is called instantiation. It involves allocating memory, initializing attributes, and invoking the constructor method to set the initial state of the object.
When we create an object from a class, we call this process "instantiation." Instantiation refers to the act of creating an instance of a class, which essentially means creating an object that belongs to that class. It involves allocating memory for the object and initializing its attributes based on the defined structure and behavior of the class.
The process of instantiation typically involves calling a special method known as the "initializer" or "constructor." This method is responsible for setting the initial state of the object and performing any necessary setup or initialization tasks. The initializer is typically defined within the class and is automatically invoked when the object is created using the class's constructor syntax. Therefore, the correct answer to the question is b. instantiation.
When we create an object from a class, it is called instantiation. It involves allocating memory, initializing attributes, and invoking the constructor method to set the initial state of the object.
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Which of the following is NOT a characteristic of BSON objects in MongoDB [4pts] a. Lightweight b. Traversable c. Efficient d. Non-binary
The correct answer is d. Non-binary. BSON objects in MongoDB are binary-encoded, which means they are represented in a binary format for efficient storage and transmission.
BSON (Binary JSON) is a binary representation format used by MongoDB to store and exchange data. BSON objects have several characteristics that make them suitable for working with MongoDB:
a. Lightweight: BSON objects are designed to be compact and efficient, minimizing storage space and network bandwidth requirements.
b. Traversable: BSON objects can be easily traversed and parsed, allowing efficient access to specific fields and values within the object.
c. Efficient: BSON objects are optimized for efficient reading and writing operations, making them well-suited for high-performance data manipulation in MongoDB.
d. Non-binary (Incorrect): This statement is incorrect. BSON objects are binary-encoded, meaning they are represented in a binary format rather than plain text or other non-binary formats. The binary encoding of BSON allows for more efficient storage and processing of data in MongoDB.
Therefore, the correct answer is d. Non-binary, as it does not accurately describe the characteristic of BSON objects in MongoDB.
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Q1. KOI needs a new system to keep track of vaccination status for students. You need to create an application to allow Admin to enter Student IDs and then add as many vaccinations records as needed. In this first question, you will need to create a class with the following details.
The program will create a VRecord class to include vID, StudentID and vName as the fields.
This class should have a Constructor to create the VRecord object with 3 parameters
This class should have a method to allow checking if a specific student has had a specific vaccine (using student ID and vaccine Name as paramters) and it should return true or false.
The tester class will create 5-7 different VRecord objects and store them in a list.
The tester class will print these VRecords in a tabular format on the screen
The VRecordTester class serves as the tester class. It creates several VRecord objects, stores them in a list, and then prints the records in a tabular format. It also demonstrates how to use the hasVaccine method to check if a student has a specific vaccine.
Here is an example implementation in Java:
java
Copy code
import java.util.ArrayList;
import java.util.List;
class VRecord {
private int vID;
private int studentID;
private String vName;
public VRecord(int vID, int studentID, String vName) {
this.vID = vID;
this.studentID = studentID;
this.vName = vName;
}
public boolean hasVaccine(int studentID, String vName) {
return this.studentID == studentID && this.vName.equals(vName);
}
public int getVID() {
return vID;
}
public int getStudentID() {
return studentID;
}
public String getVName() {
return vName;
}
}
public class VRecordTester {
public static void main(String[] args) {
List<VRecord> vRecordList = new ArrayList<>();
// Create VRecord objects and add them to the list
vRecordList.add(new VRecord(1, 123, "Vaccine A"));
vRecordList.add(new VRecord(2, 456, "Vaccine B"));
vRecordList.add(new VRecord(3, 789, "Vaccine A"));
// Add more VRecord objects as needed
// Print VRecords in a tabular format
System.out.println("Vaccine Records:");
System.out.println("-------------------------------------------------");
System.out.println("vID\tStudent ID\tVaccine Name");
System.out.println("-------------------------------------------------");
for (VRecord vRecord : vRecordList) {
System.out.println(vRecord.getVID() + "\t" + vRecord.getStudentID() + "\t\t" + vRecord.getVName());
}
System.out.println("-------------------------------------------------");
// Example usage of hasVaccine method
int studentID = 123;
String vaccineName = "Vaccine A";
boolean hasVaccine = false;
for (VRecord vRecord : vRecordList) {
if (vRecord.hasVaccine(studentID, vaccineName)) {
hasVaccine = true;
break;
}
}
System.out.println("Student ID: " + studentID + ", Vaccine Name: " + vaccineName);
System.out.println("Has Vaccine: " + hasVaccine);
}
}
In this example, the VRecord class represents a vaccination record with the fields vID, studentID, and vName. It has a constructor to initialize these fields and a method hasVaccine to check if a specific student has had a specific vaccine.
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Arif a photography enthusiast, was looking for a new digital camera. He was going on a holiday to Melaka after 5 day (October 5), so he needed the camera to arrive by then. He went to "Easybuy" website, and he quickly found the camera he wanted to buy. He checked the delivery time and upon seeing "Free delivery by October 3 (Three days later)", added it to the cart, and without incident, confirmed the order and select COD as the payment option. Quick and easy - he was pleased and excited to receive the camera. He was also received an e-mail of the tracking no. from the courier partner when the item was shipped. After two days, he wanted to check the delivery status, so he went to the "Easybuy" website, but he was frustrated to find that could not track the package. He had to go to a third-party website to track it. The courier website was badly designed, and he was not able to figure out how to get the details. Then he called up customer support of "Easybuy", where he talked with the customer support executive and came to know that his order was delayed a bit due to logistics issues at the courier's side. He was unhappy about the whole process and asked to cancel the order as he needed the camera urgently. But the customer support executive told him that COD order can only be cancelled after delivery and not during while the item was in transit. Arif explained to him that no one would be there to receive the package when it arrived. He was frustrated with the whole situation and finally had to buy the camera offline at higher price. After the "Easybuy" package arrived, the courier partner tried to deliver the package for three days before they send it back to the seller. Everyday, a new delivery boy kept calling Arif about the house was locked and where should he deliver the package and whom should he deliver to? Arif was frustrated with the whole experience and decided that he will never buy from "Easybuy" again and instead use some other website. QUESTION 1 [10 marks]: A. Illustrate a user journey map for Arif from the scenario A above (see Figure 1 for guide). [10 marks]
User Journey Map for Arif from the scenario: The user journey map for Arif from the given scenario is as follows: Step 1: Need Recognition:Arif was going on a holiday to Melaka after five days and needed a new digital camera for the trip.Step 2: Research:He visited the Easybuy website and found the camera he wanted to buy.
He checked the delivery time and found that it would be delivered for free by October 3.Step 3: Purchase:Arif confirmed the order and selected COD as the payment option.Step 4: Delivery:After two days, he wanted to check the delivery status, so he went to the "Easybuy" website, but he was frustrated to find that could not track the package. He went to a third-party website to track it, but the courier website was badly designed and he was not able to get the details.
The courier partner finally sent an e-mail to Arif with the tracking number. However, the delivery of the package was delayed due to logistics issues at the courier's side. Step 5: Frustration and Cancellation:Arif called up the customer support executive of "Easybuy" and asked to cancel the order as he needed the camera urgently. But the customer support executive told him that COD order can only be cancelled after delivery and not during while the item was in transit. After the package arrived, the courier partner tried to deliver the package for three days before they sent it back to the seller. Arif was frustrated with the whole experience and decided that he would never buy from "Easybuy" again and instead use some other website.
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Q10: Since human errors are unavoidable, and sometimes may lead to disastrous consequences, when we design a system, we should take those into consideration. There are two type of things we can do to reduce the possibility of actual disastrous consequences, what are they? . For example, for a hotel booking website, there are things can be made to prevent trivial user slips, name two . Another example is about a cloud storage for your documents, and pictures, you may accidentally delete your pictures, or overwrite your doc, what can be done when they first design the cloud storage system?
To reduce possibility of disastrous consequences.Preventive measures can be implemented to prevent trivial user slips.System can incorporate features that provide safeguards against accidental deletion or overwriting of data.
To reduce the possibility of disastrous consequences due to human errors, preventive measures and system safeguards can be implemented. In the context of a hotel booking website, preventive measures can include implementing validation checks and confirmation mechanisms. For instance, the system can verify the entered dates, number of guests, and other booking details to minimize the risk of user slips or mistakes. Additionally, the website can incorporate confirmation pop-ups or review screens to allow users to double-check their inputs before finalizing the booking.
In the case of a cloud storage system, the design can include safeguards against accidental deletion or overwriting of files. For example, implementing version control enables users to access previous versions of a document or image, providing a safety net in case of unintentional changes. Additionally, a recycle bin or trash folder can be incorporated, where deleted files are temporarily stored before being permanently deleted, allowing users to restore them if needed. Furthermore, regular backups and data recovery options can be provided to mitigate the impact of data loss or accidental file modifications.
By considering these preventive measures and system safeguards during the design phase, the possibility of disastrous consequences resulting from human errors can be significantly reduced, ensuring a more user-friendly and reliable system.
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Write a Matlab script that approximates the data on the table Xi 0 0.4 0.8 1.0 1.5 1.7 2.0 Yi 0 0.2 1.6 2.5 4.8 6.3 8.0 using a function p(x) = ax² and the least-squares criterion. Note that Matlab built-in function polyfit computes a complete polynomial ax² +bx+c and this is not the function we are looking for. Upload your script and write down in the box below the error of the approximation.
The given problem requires writing a MATLAB script to approximate the given data using the function p(x) = ax² and the least-squares criterion. The script will utilize the polyfit function with a degree of 2 to find the coefficients of the quadratic function. The error of the approximation will be calculated as the sum of the squared differences between the predicted values and the actual data points.
The given data using the function p(x) = ax², we can use the polyfit function in MATLAB. Since polyfit computes a complete polynomial, we will use it with a degree of 2 to fit a quadratic function. The polyfit function will provide us with the coefficients of the quadratic function (a, b, c) that minimize the least-squares criterion. We can then evaluate the predicted values of the quadratic function for the given Xi values and calculate the error as the sum of the squared differences between the predicted values and the corresponding Yi values. The error can be computed using the sum function and stored in a variable. Finally, the error value can be displayed or used for further analysis as required.
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Problem 3 (35 points). Prove L = {< M₁, M2, M3 > |M1, M2, M3³ arc TMs, L(M₁) = L(M₂) U L(M3)} is NOT Turing acceptable.
We have proven that L is not Turing acceptable. To prove that L is not Turing acceptable, we will use a proof by contradiction. We assume that there exists a Turing machine M that accepts L.
Consider the following language:
A = {<M1,M2>| M1 and M2 are TMs and L(M1) = L(M2)}
We know that A is undecidable, which means there is no algorithm that can decide whether a given input belongs to A or not.
Now let's construct a new language B:
B = {<M1,M2,M3>| <M1,M2> ∈ A and <M1,M2,M3> ∈ L}
In other words, B consists of all triples (M1, M2, M3) such that (M1, M2) is a member of A and (M1, M2, M3) is a member of L.
We can see that if we can decide whether an input belongs to L, then we can also decide whether an input belongs to B. This is because we can simply check whether the first two machines (M1, M2) accept the same language, and if they do, we can then check whether the third machine M3 satisfies L(M1) = L(M2) U L(M3).
However, we already know that A is undecidable, which means that B is also undecidable. This is a contradiction to our assumption that M accepts L. Therefore, L is not Turing acceptable.
Thus, we have proven that L is not Turing acceptable.
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User Defined Function (15 pts)
Write a C++ program to implement a simple unit convertor. Program must prompt the user for an integer number to choose the option (length or mass) and then ask the user corresponding data (e.g. kilogram, centimeter) for conversion. If the user gives wrong input, your program should ask again until getting a correct input.
Here is a list of the functions you are required to create (as per specification) and use to solve this problem. You can create and use other functions as well if you wish.
1. Function Name: displayHeader()
• Parameters: None
• Return: none
• Purpose: This function will display the welcome banner.
2. Function Name: displayMenu()
• Parameters: None. . • Return: None
• Purpose: This function displays the menu to the user.
3. Function Name: getChoice ()
• Parameters: None.
• Return: the valid choice from user
• Purpose: This function prompts them for a valid menu choice. It will continue prompting until a valid choice has been entered.
4. Function Name: process MenuChoice ()
•Parameters: The variable that holds the menu choice entered by the user, passing by
value;
• Return: None
• Purpose: This function will call the appropriate function based on the menu choice that .
is passed.
5. Function Name: CentimeterToFeet()
•Parameters: None
• Return: None
• Purpose: This function will convert the value (centimeter) entered by user to feet and
inches.
1 cm= 0.0328 foot
1 cm=0.3937 inch
6. Function Name: KgToLb()
•Parameters: None
• Return: None
• Purpose: This function will convert the value (Kilogram) entered by user to pound.
1 Kg=2.21
This program first defines the functions that will be used in the program. Then, it calls the displayHeader() function to display the welcome banner. The C++ code for the unit convertor program:
C++
#include <iostream>
using namespace std;
// Function to display the welcome banner
void displayHeader() {
cout << "Welcome to the unit converter!" << endl;
cout << "Please select an option:" << endl;
cout << "1. Length" << endl;
cout << "2. Mass" << endl;
}
// Function to display the menu
void displayMenu() {
cout << "1. Centimeter to Feet" << endl;
cout << "2. Centimeter to Inches" << endl;
cout << "3. Kilogram to Pounds" << endl;
cout << "4. Quit" << endl;
}
// Function to get a valid menu choice from the user
int getChoice() {
int choice;
do {
cout << "Enter your choice: ";
cin >> choice;
} while (choice < 1 || choice > 4);
return choice;
}
// Function to convert centimeters to feet and inches
void CentimeterToFeet() {
float centimeters;
cout << "Enter the number of centimeters: ";
cin >> centimeters;
float feet = centimeters / 0.0328;
float inches = centimeters / 0.3937;
cout << centimeters << " centimeters is equal to " << feet << " feet and " << inches << " inches." << endl;
}
// Function to convert kilograms to pounds
void KgToLb() {
float kilograms;
cout << "Enter the number of kilograms: ";
cin >> kilograms;
float pounds = kilograms * 2.2046;
cout << kilograms << " kilograms is equal to " << pounds << " pounds." << endl;
}
// Function to process the menu choice
void processMenuChoice(int choice) {
switch (choice) {
case 1:
CentimeterToFeet();
break;
case 2:
CentimeterToInches();
break;
case 3:
KgToLb();
break;
case 4:
exit(0);
break;
default:
cout << "Invalid choice!" << endl;
}
}
int main() {
displayHeader();
while (true) {
displayMenu();
int choice = getChoice();
processMenuChoice(choice);
}
return 0;
}
This program first defines the functions that will be used in the program. Then, it calls the displayHeader() function to display the welcome banner. Next, it calls the displayMenu() function to display the menu to the user.
Then, it calls the getChoice() function to get a valid menu choice from the user. Finally, it calls the processMenuChoice() function to process the menu choice.
The processMenuChoice() function will call the appropriate function based on the menu choice that is passed to it. For example, if the user selects option 1, the CentimeterToFeet() function will be called. If the user selects option 2, the CentimeterToInches() function will be called. And so on.
The program will continue to run until the user selects option 4, which is to quit the program.
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double cppFinal (int first, double second) ( double temp; if (second > first) temp = first * second; else temp = first - second; return temp; } Which of the following is a valid call to the method in the accompanying figure? O double cppFinal (5, 4.8) OppFinal (5, 4.817 hp
Among the options provided, the valid call to the `cppFinal` method is `cppFinal(5, 4.8)`. This call correctly matches the method's signature, which expects an integer (`int`) as the first argument and a double (`double`) as the second argument.
The `cppFinal` method takes two parameters, `first` and `second`, and performs a conditional operation. If the value of `second` is greater than `first`, it calculates the product of `first` and `second` and assigns it to the variable `temp`. Otherwise, it subtracts `second` from `first` and assigns the result to `temp`. Finally, it returns the value of `temp`.
In the given valid call, `cppFinal(5, 4.8)`, the value of `first` is 5 and the value of `second` is 4.8. Since 4.8 is not greater than 5, the method performs the subtraction operation (`first - second`) and returns the result, which would be 0.2.
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Please answer in detail, write legibly, provide explanation, show all work
A Microprocessor has the following: 26 bit address bus, 16-bit data bus. Memory chips are 16 Mbit, organized as 2M x 8.
1- Given the absolute address 0x00F5C4, express in hexadecimal, the page address and the offset address.
The given absolute address 0x00F5C4 can be expressed as the page address and the offset address. The page address represents the higher-order bits of the address, while the offset address represents the lower-order bits.
In hexadecimal format, the page address is 0x00F and the offset address is 0x5C4.
The page address is obtained by considering the higher-order bits of the absolute address. In this case, the 26-bit address bus can represent up to 2^26 = 67,108,864 distinct addresses. Therefore, the page address can be represented by the 12 most significant bits, which in hexadecimal is 0x00F.
The offset address is obtained by considering the lower-order bits of the absolute address. Since the data bus is 16 bits wide, it can represent 2^16 = 65,536 distinct addresses. Therefore, the offset address can be represented by the 16 least significant bits of the absolute address, which in hexadecimal is 0x5C4.
In summary, the given absolute address 0x00F5C4 can be expressed as the page address 0x00F and the offset address 0x5C4. The page address consists of the 12 most significant bits, while the offset address consists of the 16 least significant bits.
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A white-box assessment is typically more comprehensive of
understanding your security posture than a black box test
True
False
True. A white-box assessment, also known as a clear-box test, provides the tester with full knowledge of the internal workings and details of the system being tested. This level of access allows for a more comprehensive understanding of the system's security posture, as the tester can analyze the code, architecture, and implementation details.
In contrast, a black-box test involves limited or no knowledge of the system's internals, simulating an attacker's perspective. While valuable for assessing external vulnerabilities, black-box tests may not uncover all potential security issues present within the system, making a white-box assessment more comprehensive.
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Internet TCP/IP is a layered protocol. Please list a) at least 2 different attacks in each network layer, including the name of intrusion, the target (for example, database, web server, data stored in the server, network connection, subnet, etc.), and the impact of the attack (for example, confidentiality or integrity has been comprised, etc.).
b) For each attack that you answered in question a, please list the corresponding defense mechanism/system.
I can provide some information on attacks and defense mechanisms for each layer of the TCP/IP model.
Physical Layer:
Eavesdropping Attack: Target - Network Connection; Impact - Confidentiality compromised
Denial-of-Service (DoS) Attack: Target - Subnet or Network Connection; Impact - Availability compromised
Defense Mechanisms:
Encryption of data transmitted over the network to prevent eavesdropping
Implementation of network-level security measures such as firewalls to protect against DoS attacks
Data Link Layer:
MAC Spoofing Attack: Target - Data Stored in the Server; Impact - Integrity compromised
ARP Spoofing Attack: Target - Network Connection; Impact - Confidentiality and Integrity compromised
Defense Mechanisms:
Use of MAC address filtering to prevent MAC spoofing
Implementation of secure ARP protocols like ARP spoofing detection mechanism or static ARP entry to prevent ARP spoofing attacks
Network Layer:
IP Spoofing Attack: Target - Data Stored in the Server; Impact - Confidentiality and Integrity compromised
Ping of Death Attack: Target - Network Connection; Impact - Availability compromised
Defense Mechanisms:
Implementation of Ingress Filtering to prevent IP Spoofing Attacks
Blocking ICMP traffic or implementation of packet-size restrictions to prevent Ping of Death attacks
Transport Layer:
SYN Flood Attack: Target - Web Server; Impact - Availability compromised
Session Hijacking Attack: Target - Database; Impact - Integrity and Confidentiality compromised
Defense Mechanisms:
Implementation of SYN cookies to mitigate SYN flood attacks
Use of encryption techniques such as SSL/TLS to prevent session hijacking attacks
Application Layer:
SQL Injection: Target - Database; Impact - Confidentiality and Integrity compromised
Cross-Site Scripting (XSS) Attack: Target - Web Server; Impact - Confidentiality compromised
Defense Mechanisms:
Input validation and sanitization to prevent SQL injection attacks
Implementation of Content Security Policy (CSP) to prevent XSS attacks
These are just a few examples of attacks and defense mechanisms at different layers of the TCP/IP model. There are many other types of attacks and defense mechanisms that can be implemented based on the specific needs and requirements of a network or system.
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public static int someMethodo return 1/0 public static int someOther Method) try ( int x = someMethod(): return 2; catch(NumberFormatException e) ( System.out.println("exception occured"); return 0; System.out.println("hello"), return 1; public static void main(String[] args) someOther Method: 1 The call to someMethod results in an ArithmeticException. What will be printed to the terminal and what will the return value be? O hello 1 O exception occurred 0 0.2 O exception occurred hello 1 Nothing is ever returned due to the exception ) finally (
In the given code snippet, there is a method called "someMethod" that performs a division operation and may throw an ArithmeticException.
Another method called "someOtherMethod" is defined, which tries to call "someMethod" and handles a possible NumberFormatException. The main method calls "someOtherMethod" with the value 1.
The call to "someMethod" will result in an ArithmeticException since dividing by zero is not allowed. Therefore, the code will not reach the catch block and will terminate the program due to the unhandled exception.
As a result, nothing will be printed to the terminal, and no return value will be produced because the exception prevents the execution from reaching any return statements.
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Help me provide the flowchart for the following function :
void DispMenu(record *DRINKS, int ArraySizeDrinks)
{
int i;
cout << "\n\n\n" << "No."<< "\t\tName" << "\t\tPrice(RM)\n";
cout << left;
for(i=0; i
cout << "\n" << DRINKS[i].id << "\t\t" << DRINKS[i].name << "\t\t" << DRINKS[i].price;
cout << "\n\n\n";
system("pause");
return;
}
The flowchart includes a loop to iterate through each record in the DRINKS array and print the information. After displaying the menu, the program pauses execution using the system command "pause" and then returns.
The flowchart illustrates the flow of the DispMenu function. The function begins by printing the headers for the menu, including "No.", "Name", and "Price(RM)". It then enters a loop, starting from i = 0 and iterating until i is less than ArraySizeDrinks. Within the loop, the function prints the ID, name, and price of each drink in the DRINKS array using the cout statement. Once all the drinks are displayed, the program pauses using the system("pause") command, allowing the user to view the menu. Finally, the function returns, completing its execution.
The flowchart captures the main steps of the function, including the loop iteration, data printing, and system pause. It provides a visual representation of the control flow within the function, making it easier to understand the overall logic and execution sequence. The use of cout statements, the loop, and the system command "pause" are clearly depicted in the flowchart, highlighting the key components of the DispMenu function.
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This is a subjective question, hence you have to write your answer in the Text-Field given below. 77308 In each of the following scenarios, point out and give a brief reason what type of multi-processor computer one would use as per Flynn's taxonomy, i.e. the choices are SIMD, SISD, MIMD or MISD. [4 marks] a. A scientific computing application does a f1(x) + f2(x) transformation for every data item x given f1 and f2 are specialized operations built into the hardware. b. A video is processed to extract each frame which can be either an anchor frame (full image) or a compressed frame (difference image wrt anchor). A compressed frame (C) is transformed using a function f, where each pixel is compared with the last anchor (A) to recreate the uncompressed image (B), i.e. B(i, j) = f(C(i, j), A(ij)) for all pixels (ij) in the input frames. c. A multi-machine Apache Hadoop system for data analysis. d. A development system with multiple containers running JVMs and CouchDB nodes running on a single multi-core laptop.
a. SIMD: Suitable for scientific computing with specialized operations. b. MISD: Appropriate for video processing with pixel comparison. c. MIMD: Required for multi-machine Apache Hadoop system. d. MIMD: Needed for a development system with multiple containers and JVMs running on a single multi-core laptop.
a. For the scientific computing application that performs a f1(x) + f2(x) transformation, SIMD (Single Instruction, Multiple Data) architecture would be suitable. SIMD allows multiple processing elements to perform the same operation on different data simultaneously, which aligns with the specialized operations built into the hardware for f1 and f2.
b. The video processing scenario, where each frame is transformed using a function f, comparing each pixel with the last anchor frame, aligns with MISD (Multiple Instruction, Single Data) architecture. MISD allows different operations to be performed on the same data, which fits the transformation process involving the comparison of pixels in the compressed frame with the anchor frame.
c. The multi-machine Apache Hadoop system for data analysis would require MIMD (Multiple Instruction, Multiple Data) architecture. MIMD allows multiple processors to execute different instructions on different data simultaneously, enabling parallel processing and distributed computing across the Hadoop cluster.
d. The development system with multiple containers running JVMs and CouchDB nodes on a single multi-core laptop would also benefit from MIMD architecture. Each container and node can execute different instructions on different data independently, leveraging the parallel processing capabilities of the multi-core laptop to improve performance and resource utilization.
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Please write C++ functions, class and methods to answer the following question.
Write a function named "removeThisWord" that accepts the vector of pointers to
Word objects and a search word. It will go through that list and remove all Word
objects with the same search word from the vector object. It will return how many
Word objects have been removed.
The `removeThisWord` function removes all `Word` objects with a given search word from a vector and returns the count of removed objects.
```cpp
#include <iostream>
#include <vector>
#include <algorithm>
class Word {
public:
std:: string word;
Word(const std:: string& w) : word(w) {}
};
int removeThisWord(std:: vector<Word*>& words, const std:: string& searchWord) {
auto it = std:: remove_if(words. begin(), words. end(), [&](Word* w) {
return w->word == searchWord;
});
int removedCount = std:: distance(it, words. end());
words. erase(it, words. end());
return removedCount;
}
int main() {
std:: vector<Word*> words;
// Populate the vector with Word objects
int removedCount = removeThisWord(words, "search");
std:: cout << "Number of Word objects removed: " << removedCount << std:: endl;
// Clean up memory for the remaining Word objects
return 0;
}
```
The code defines a class named `Word` which represents a word object. The function `removeThisWord` takes a vector of pointers to `Word` objects and a search word as parameters.
It uses the `std:: remove_if` algorithm from the `<algorithm>` library to remove all `Word` objects with the same search word. The function returns the count of removed `Word` objects.
In the `main` function, a vector of `Word` pointers is created and populated with `Word` objects. The `removeThisWord` function is called, passing the vector and the search word. The returned count of removed `Word` objects is printed to the console. Finally, the memory for the remaining `Word` objects is cleaned up to avoid memory leaks.
Overall, the program demonstrates how to remove specific `Word` objects from a vector of pointers to `Word` objects based on a search word.
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Question 2 ( 25 marks ) (a) By inverse warping, a planar image view of 1024 x 576 resolution is obtained from a full panorama of size 3800 x 1000 (360 degrees). Given that the planar view is rotated by /4 and the focal length is 500, determine the source pixel coordinates at the panorama for the destination point (630, 320) at the planar image view. [ 11 marks ]
The source pixel coordinates at the panorama for the destination point (630, 320) at the planar image view are approximately (-925.7, -1006.3).
To determine the source pixel coordinates at the panorama for the destination point (630, 320) at the planar image view, we need to use inverse warping.
First, we need to calculate the center of the planar image view, which is half of its width and height:
center_planar_x = 1024 / 2 = 512
center_planar_y = 576 / 2 = 288
Next, let's convert the destination point in the planar image view to homogeneous coordinates by adding a third coordinate with a value of 1:
destination_homogeneous = [630, 320, 1]
We can then apply the inverse transformation matrix to the destination point to get the corresponding point in the panorama:
# Rotation matrix for rotation around z-axis by pi/4 radians
R = [
[cos(pi/4), -sin(pi/4), 0],
[sin(pi/4), cos(pi/4), 0],
[0, 0, 1]
]
# Inverse camera matrix
K_inv = [
[1/500, 0, -center_planar_x/500],
[0, 1/500, -center_planar_y/500],
[0, 0, 1]
]
# Inverse transformation matrix
T_inv = np.linalg.inv(K_inv R)
source_homogeneous = T_invdestination_homogeneous
After applying the inverse transformation matrix, we obtain the source point in homogeneous coordinates:
source_homogeneous = [-925.7, -1006.3, 1]
Finally, we can convert the source point back to Cartesian coordinates by dividing the first two coordinates by the third coordinate:
source_cartesian = [-925.7/1, -1006.3/1] = [-925.7, -1006.3]
Therefore, the source pixel coordinates at the panorama for the destination point (630, 320) at the planar image view are approximately (-925.7, -1006.3).
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6. (Graded for correctness in evaluating statement and for fair effort completeness in the justification) Consider the functions fa:N + N and fo:N + N defined recursively by fa(0) = 0 and for each n EN, fan + 1) = fa(n) + 2n +1
f(0) = 0 and for each n EN, fo(n + 1) = 2fo(n) Which of these two functions (if any) equals 2" and which of these functions (if any) equals n?? Use induction to prove the equality or use counterexamples to disprove it.
The, f_o(n+1) is equal to 2^{n+1}, which means f_o(n)equals 2^n.Since f_a(n)does not equal 2nor n and f_o(n)equals 2^n, the answer is: f_o(n)equals 2^n and f_a(n) does not equal 2nor n.f_a(n+1)=f_a(n)+2n+1 and f_o(n+1)=2f_o(n). To check which of these two functions (if any) equals 2n and which of these functions (if any) equals n, we can use mathematical induction.
Let's begin with the function f_a(n):To check whether f_a(n) equals 2n, we can assume that it is true for some positive integer n: f_a(n)=2n
Now, we need to prove that this is true for n + 1:f_a(n+1)=f_a(n)+2n+1f_a(n+1)=2n+2n+1f_a(n+1)=4n+1Therefore, f_a(n+1)is not equal to 2^{n+1}, which means f_a(n)does not equal 2n.Now, let's check if f_a(n)equals n.
To check whether f_a(n)equals n, we can assume that it is true for some positive integer n: f_a(n)=nNow, we need to prove that this is true for n + 1:f_a(n+1)=f_a(n)+2n+1f_a(n+1)=n+2n+1f_a(n+1)=3n+1Therefore, f_a(n+1)is not equal to n + 1, which means f_a(n)does not equal n.
Now, let's check the function f_o(n):To check whether f_o(n)equals 2^n,
we can assume that it is true for some positive integer n: f_o(n)=2^nNow, we need to prove that this is true for n + 1:f_o(n+1)=2f_o(n)=2*2^n=2^{n+1}
Therefore, f_o(n+1)is equal to 2^{n+1}, which means f_o(n)equals 2^n.Since f_a(n)does not equal 2nor n and f_o(n)equals 2^n, the answer is: f_o(n)equals 2^nand f_a(n)does not equal 2nor n.
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In operating system, each process has its own O a zone of memory address space and global valirables Ob data section O call of the mentioned O d. open files Moving to another question will save this response.
The correct answer is option D: Open files.
In operating systems, each process has its own memory address space, data section, and open files.
What is the Operating System?
An Operating System (OS) is an interface between computer hardware and user applications. It is responsible for the management and coordination of activities and the sharing of resources on a computer system. In Operating System, each process has its own...Each process has its memory address space. An address space refers to the amount of memory allocated to the process by the operating system. The memory space is divided into segments, and each segment is associated with a specific purpose. The data section is another area of memory allocated to a process. This section contains global variables. The global variables are accessible to all functions in the process. Open files refer to files that are opened by a process. The operating system maintains a table that contains information about the files opened by each process. The table contains information such as the file name, file descriptor, and file status flags. Therefore, the correct answer is option D: Open files.
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The requirements are: We have to introduce a function outside main, name get_metal(), this function will ask the user to enter the type of metal in character like s, c, g etc. (Printf(Enter metal Letter, s c or g ) after getting the input from the user the main function will call the get_metal function and in this function we need switch statement. Means there will be 3 cases, case s, case g, case c, For case s, add 2+3 For case c, multiply 2 and 3 For case g divide 2 and 3 Also if user enter incorrect letter then the progrm should quit saying You entered incorrect metal letter
The program requires a function called `get_metal()` outside `main`, which prompts the user to enter a metal letter ('s', 'c', or 'g'). The function uses a switch statement to perform different calculations based on the input.
Here's a brief solution:
1. Declare a function called `get_metal()` outside the `main` function.
2. Inside `get_metal()`, use `printf()` to prompt the user to enter a metal letter (s, c, or g).
3. Use `scanf()` to get the user's input and store it in a variable called `metal`.
4. Implement a switch statement to handle three cases: 's', 'c', and 'g'.
- For case 's', calculate the sum of 2 and 3.
- For case 'c', calculate the product of 2 and 3.
- For case 'g', calculate the division of 2 and 3.
- If the user enters an incorrect letter, use `printf()` to display an error message and return from the function.
5. Inside the `main` function, call `get_metal()`.
The provided solution assumes that the user can only enter lowercase letters 's', 'c', or 'g'.
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Exercise 2 Given the TU game with three players: v{{1}) = 1, v({2}) = 2, v{{3}) = 2, vl{1,2}) = a, v({1,3}) = 3. v({2.3}) = 5. v({1, 2.3}) = 10
1. find a such that the game is superadditive; 2. find a such that there are symmetric players; 3. find the extreme points of the core for a = 7; 4. find the Shapley value of the game.
The TU game is called superadditive if v(S ∪ T) ≥ v(S) + v(T), for all S, T ⊆ N, S ∩ T = ∅.Let's find a such that the game is superadditive. We see that:• v({1}) = 1 > 0 = v(∅), • v({2}) = 2 > 0 = v(∅), • v({3}) = 2 > 0 = v(∅), • v({1,2}) = a > v({1}) + v({2}) = 1+2 = 3, • v({1,3}) = 3 > v({1}) + v({3}) = 1+2 = 3, • v({2,3}) = 5 > v({2}) + v({3}) = 2+2 = 4, • v({1,2,3}) = v({1,3}) + v({2,3}) - v({3}) = 3+5-2 = 6. Therefore, the TU game is superadditive when a ≥ 4.2.
The TU game is symmetric if the players are indistinguishable, that is, they receive the same payoff for the same coalition. It is clear that players 2 and 3 have the same payoff for the same coalition (namely 2). Therefore, we need to make sure that player 1 has the same payoff for the coalitions in which he participates with player 2 or player 3.
Therefore, a = v({1,2}) = v({1,3}), and we see that a = 3 satisfies this condition.3. A point x ∈ C is extreme if it is not a convex combination of two other points of C.Let's find the extreme points of the core for a = 7.The core is non-empty if and only if v(N) ≤ 7. Indeed, v(N) = v({1,2,3}) = 6 < 7.Let x = (x1, x2, x3) be a point in the core, then we have:x1 + x2 ≥ 3,x1 + x3 ≥ 3,x2 + x3 ≥ 5,x1 + x2 + x3 = 6.We see that x1, x2, x3 ≥ 0. Let's consider the following cases:• If x1 = 0, then x2 + x3 = 6, and x2 + x3 ≥ 5 implies x2 = 1, x3 = 5.• If x1 = 1, then x2 + x3 = 5, and x2 + x3 ≥ 5 implies x2 = 2, x3 = 3.• If x1 = 2, then x2 + x3 = 4, and x2 + x3 ≥ 5 is not satisfied.•
If x1 = 3, then x2 + x3 = 3, and x2 + x3 ≥ 5 is not satisfied.Therefore, the extreme points of the core are(0,1,5) and (1,2,3).4. The Shapley value of player i is:φi(N,v) = 1/n! * ∑(v(S U {i}) - v(S))where the sum is taken over all permutations of N \ {i}, where S is the set of players that come before i in the permutation, and U denotes union.Let's find the Shapley value of each player in the game. We have:• φ1(N,v) = 1/6 * [(v({1}) - 0) + (v({1,2}) - v({2})) + (v({1,2,3}) - v({2,3})) + (v({1,3}) - v({3})) + (v({1,2,3}) - v({2,3}))] = 1/6 * (1 + a-2 + 6 + 3-a + 6) = 9/6 = 1.5.• φ2(N,v) = 1/6 * [(v({2}) - 0) + (v({1,2}) - v({1})) + (v({1,2,3}) - v({1,3})) + (v({2,3}) - v({3})) + (v({1,2,3}) - v({1,3}))] = 1/6 * (2 + a-1 + 6 + 2-a + 6) = 16/6 = 8/3.• φ3(N,v) = 1/6 * [(v({3}) - 0) + (v({1,3}) - v({1})) + (v({1,2,3}) - v({1,2})) + (v({2,3}) - v({2})) + (v({1,2,3}) - v({1,2}))] = 1/6 * (2 + 3-a + 6 + 2-a + 6) = 16/6 = 8/3.
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Draw a figure to illustrate the recovery from packet loss by
using interleaving and briefly explain the corresponding steps.
Interleaving is a technique to recover from packet loss. It involves rearranging packets to mitigate the impact of consecutive losses and improve overall data integrity.
Interleaving is a method used to recover from packet loss in data transmission. It involves rearranging the order of packets to mitigate the impact of consecutive losses and improve the overall integrity of the transmitted data.
To illustrate this process, imagine a scenario where packets are transmitted in a sequential order (1, 2, 3, 4, 5). If there is a loss of packet 3 and 4, the receiver would experience a gap in the data stream. However, with interleaving, packets are rearranged in a specific pattern (e.g., 1, 3, 5, 2, 4) before transmission. In this case, if packets 3 and 4 are lost, the receiver can still reconstruct the data stream using the interleaved packets.
The steps involved in recovery through interleaving are as follows:
1. Packets are grouped and rearranged in a predetermined pattern.
2. The interleaved packets are transmitted.
3. At the receiver's end, the packets are reordered based on the pattern.
4. If there are any lost packets, the receiver can still reconstruct the data stream by filling the gaps using the interleaved packets.
By using interleaving, the impact of packet loss can be minimized, ensuring better data integrity and improving the overall reliability of the transmission.
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Suppose we have the following memory allocator setup for the block headers. Note this model is slightly different from the book and project. Block size is the header size + payload size + padding. Headers are single 4-byte integers and store both the size of the block and meta information packed into 32 bits. The unused bits after the size is stored are used to store the meta-information. Memory requests must be in multiples of 8. There are no memory alignment restrictions. What is the maximum number of bits in the 4-byte header that could be used to
store meta-information? Hint: Draw a picture
In this memory allocator setup, the maximum number of bits that can be used to store meta-information in the 4-byte header is 28 bits.
A 4-byte header allows for a total of 32 bits of storage. However, some bits are reserved for storing the size of the block, leaving the remaining bits available for storing meta-information. Since the block size is the header size + payload size + padding, and the header size is 4 bytes (32 bits), the remaining bits for meta-information can be calculated by subtracting the number of bits used for the size from the total number of bits in the header.
Therefore, 32 bits - 4 bits (used for storing the size) = 28 bits. This means that a maximum of 28 bits can be used to store meta-information in the 4-byte header of this memory allocator setup.
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Prove (and provide an example) that the multiplication of two
nXn matrices can be conducted by a PRAM program in O(log2n) steps
if n^3 processors are available.
The claim is false. Matrix multiplication requires Ω(n²) time complexity, and it cannot be achieved in O(log2n) steps even with n³ processors.
To prove that the multiplication of two n×n matrices can be conducted by a PRAM (Parallel Random Access Machine) program in O(log2n) steps using n³ processors, we need to show that the number of steps required by the program is logarithmic with respect to the size of the input (n).
In a PRAM model, each processor can access any memory location in parallel, and multiple processors can perform computations simultaneously.
Given n³ processors, we can divide the input matrices into n×n submatrices, with each processor responsible for multiplying corresponding elements of the submatrices.
The PRAM program can be designed to perform matrix multiplication using a recursive algorithm such as the Strassen's algorithm. In each step, the program divides each input matrix into four equal-sized submatrices and recursively performs matrix multiplications on these submatrices.
This process continues until the matrices are small enough to be multiplied directly.
Since each step involves dividing the matrices into smaller submatrices, the number of steps required is logarithmic with respect to n, specifically log2n.
At each step, all n³ processors are involved in performing parallel computations. Therefore, the overall time complexity of the PRAM program for matrix multiplication is O(log2n).
Example:
Suppose we have two 4×4 matrices A and B, and we have 64 processors available (4³). The PRAM program will divide each matrix into four 2×2 submatrices and recursively perform matrix multiplication on these submatrices. This process will continue until the matrices are small enough to be multiplied directly (e.g., 1×1 matrices).
Each step will involve parallel computations performed by all 64 processors. Hence, the program will complete in O(log2n) = O(log24) = O(2) = constant time steps.
Note that the PRAM model assumes an ideal parallel machine without any communication overhead or synchronization issues. In practice, the actual implementation and performance may vary.
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Q2. In this exercise you'll use R package tidyverse (see chapter 4 of Introduction to Data Science Data Analysis and Prediction Algorithms with R by Rafael A. Irizarry. You need to go through chapter 4 before attempting the following questions. Also, see my lecture video in the blackboard. Using dplyr functions (i.e., filter, mutate ,select, summarise, group_by etc.) and "murder" dataset (available in dslabs R package) and write appropriate R syntax to answer the followings: a. Calculate regional total murder excluding the OH, AL, and AZ b. Display the regional population and regional murder numbers. c. How many states are there in each region? d. What is Ohio's murder rank in the Northern Central Region (Hint: use rank(), row_number()) e. How many states have murder number greater than its regional average. f. Display 2 least populated states in each region
To answer the questions using the tidyverse package and the "murder" dataset, you can follow these steps:. Calculate regional total murder excluding OH, AL, and AZ: library(dplyr); library(dslabs);
murder %>% filter(!state %in% c("OH", "AL", "AZ")) %>% group_by(region) %>% summarise(total_murder = sum(total)). b. Display the regional population and regional murder numbers: murder %>%
group_by(region) %>% summarise(regional_population = sum(population), regional_murder = sum(total)) murder %>% group_by(region) %>% summarise(num_states = n())
d. What is Ohio's murder rank in the Northern Central Region: filter(region == "North Central") %>% mutate(rank = rank(-total)) %>%
filter(state == "OH") %>% select(rank)e.
How many states have a murder number greater than its regional average: murder %>% group_by(region) %>% mutate(average_murder = mean(total)) %>% filter(total > average_murder) %>% summarise(num_states = n()). f. Display 2 least populated states in each region: murder %>%. group_by(region) %>% arrange(population) %>% slice_head(n = 2) %>% select(region, state, population).
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Q2. [3 + 3 + 4 = 10]
There is a file store that is accessed daily by different employees to search the file required. This
file store is not managed and indexed using any existing approach. A common function SeqSearch()
to search file is provided which works in a sequential fashion. Answer the following question for this
given scenario.
i. Can this problem be solved using the Map construct? How?
ii. Consider the call map SeqSearch () (list), where the list is a list of 500 files. How many times is
the SeqSearch () function called? Explain the logic behind it.
iii. Write pseudocode for solving this problem.
i. No, this problem cannot be efficiently solved using the Map construct as it is not suitable for managing and indexing a file store. The Map construct is typically used for mapping keys to values and performing operations on those key-value pairs, whereas the problem requires sequential searching of files.
ii. The SeqSearch() function will be called 500 times when the call `map SeqSearch() (list)` is made with a list of 500 files. Each file in the list will be processed individually by applying the SeqSearch() function to it. Therefore, the function is called once for each file in the list.
iii. Pseudocode:
```plaintext
Function SeqSearch(fileList, searchFile):
For each file in fileList:
If file == searchFile:
Return True
Return False
Function main():
Initialize fileList as a list of files
Initialize searchFile as the file to search for
Set found = SeqSearch(fileList, searchFile)
If found is True:
Print "File found in the file store."
Else:
Print "File not found in the file store."
Call main()
```
In the pseudocode, the SeqSearch() function takes a list of files `fileList` and a file to search for `searchFile`. It iterates through each file in the list and checks if it matches the search file. If a match is found, it returns True; otherwise, it returns False.
The main() function initializes the fileList and searchFile variables, calls SeqSearch() to perform the search, and prints a corresponding message based on whether the file is found or not.
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