Write SQL queries to answer the following questions: (15 points) a. Which students have an ID number that is less than 50000

Answers

Answer 1

Answer:

SELECT * FROM STUDENTS WHERE ID < 50000

Explanation:

If we assume the table is called STUDENTS, then we want to select everything (represented by *), where (like an if statement) the ID (assuming the name of the column) is less than 50000.


Related Questions

You wrote a list of steps the user will take to perform a task. Which statement is true about this step?
You have drawn pictures of what your screens will look like and identified the input-process-output that occurs on each
screen.
O Your app is functioning and ready to test.
O You have defined a use case.
O In this step, you defined your target audience and main goal.

Answers

The statements that are true about this step are:

In this step, you defined your target audience and main goal.You have drawn pictures of what your screens will look like and identified the input-process-output that occurs on each screen.Your app is functioning and ready to test.

What is a an app?

A mobile application, sometimes known as an app, is a computer program or software application that is meant to operate on a mobile device, such as a phone, tablet, or watch.

An app is a software program that allows users to do certain functions on their mobile or desktop device. Apps are either pre-installed on your device or downloaded through a specialized app store, such as the Apple App Store. Apps are usually created in a variety of programming languages.

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Please help me understand what I'm doing wrong in my python code, its returning a [] in the written file.
# You work at a low latency trading firm and are asked to deliver the order book data provided in order_book_data.txt to a superior
# The problem is that the data isn't formatted correctly. Please complete the following steps to apropriately format the data
# Notice, the first column is a ticker, the second column is a date, the third column is a Bid, the fourth column is an Ask, and the fifth column is a currency type
# 1. Open order_book_data.txt
# 2. Remove the order book lines. i.e. ***** Order Book: ###### *****
# 3. Get rid empty lines
# 4. Get rid of spaces
# 5. Notice that there are two currencies in the order book; USD and YEN. Please convert both the Bid and Ask price to USD (if not already)
# The Bid and Ask are the 3rd and 4th column, respectively
# 6. Create a header line Ticker, Date, Bid, Ask
# 7. Save the header line and propely formatted lines to a comma seperated value file called mktDataFormat.csv

Please help me understand what I'm doing wrong in my python code, its returning a [] in the written file.#
Please help me understand what I'm doing wrong in my python code, its returning a [] in the written file.#

Answers

Answer:

There are several issues with the code that could be causing it to return an empty file.

Indentation errors: Python relies on indentation to indicate blocks of code, so it's important to make sure that the code is indented correctly. In your code, the if statement and columnA = float(columnA) line are not indented properly.Missing append statement: After converting the Bid and Ask prices to USD, the code is not actually adding them to the data list.Writing the wrong variable: In the last line of the code, you are writing the entire data list as a string, instead of iterating through the list and writing each element as a string.

Explanation:

file = open("order_book_data.txt", "r")

data = []

lines = file.readlines()

for line in lines:

if line.strip() == '':

continue

if ("***" in line):

continue

column = line.strip().split(",")

columnA = float(column[2])

columnB = float(column[3])

if column[4] == "YEN":

columnA = columnA * 0.0075

columnB = columnB * 0.0075

column[2] = str(columnA)

column[3] = str(columnB)

data.append(",".join(column))

header = "Ticker,Date,Bid,Ask\n"

file.close()

file2 = open("mktlinesFormat.csv", "w")

file2.write(header)

for line in data:

file2.write(line + "\n")

file2.close()

In this code, i use continue statements to skip over the order book lines and empty lines. then i split each line into a list of columns, convert the Bid and Ask prices to USD if necessary, and join the columns back into a comma-separated string. then append the formatted string to the data list.

After processing all the lines, i write the header line and each formatted line to a new file, one line at a time. Note that add a newline character \n to the end of each line to ensure that each line is written on a separate line in the file.

Crashes involving new teen drivers are only caused by poor skills.
True
False

Answers

The answer is false because it can be someone else’s bad driving, they can run into you.

Define a function roll() that takes no arguments, and returns a random integer from 1 to 6. Before proceeding further, we recommend you write a short main method to test it out and make sure it gives you the right values. Comment this main out after you are satisfied that roll() works.

Answers

Answer:

Follows are the code to this question:

#include <iostream>//defining a header file

using namespace std;

int roll()//defining a method roll

{

return 1+(rand() %5);//use return keyword that uses a rand method

}

int main()//defining main method

{

cout<<roll();//calling roll method that print is value

return 0;

}

Output:

4

Explanation:

In this code,  the "roll" method is defined, that uses the rand method with the return keyword, that returns the value between 1 to 6, and in the next step, the main method is declared, that uses the print method to calls the roll method.

Search for files and folders on Local Disk (C:) that were modified today. How many files or folders were found?
2. Search for files and folders on Local Disk (C:) that were modified since your last birthday. How many files or folders were found?

Answers

Answer:

1. Answer will vary

2. Answer will vary

Explanation:

how many files a person modifies cannot be predicted so search result will vary for each person

For Questions 1-4, consider the following code:

def mystery1(x):
return x + 2

def mystery2(a, b = 7):
return a + b

#MAIN
n = int(input("Enter a number:"))
ans = mystery1(n) * 2 + mystery2 (n * 3)
print(ans)


What is output when the user enters 9?

Answers

Answer:

9 would be entered as a parameter n of class mystery1 and return 9 + 2 = 11 and then 11 * 2 = 22, PLUS,

mystery2 new parameter is 9 * 3 = 27, then 27 + 7 = 34 returned

FINALLY, ans = 22 + 34

ans = 56 printed as output

What level do you get Super Saiyan God in Dragon ball final stand

Answers

Answer:

God Forms (SSJG - SSB KKx10) Unlocked at level 270, for 50,000 Zeni.

Explanation:

Answer:

Unlocked at level 270, for 50,000 Zeni.

Explanation:

What are the purposes of a good web page design? The purpose of a good web page design is to make it and .

Answers

Answer:

responsiveness and intuitive

Explanation:

The two main purposes of a good web page design is responsiveness and intuitive. A webpage needs to be designed in such a way that the individual using it can easily find what they are looking for and understand what each function in the webpage does without having to ask for help or go through an extensive tutorial. They need to be able to use the website for the first time and immediately be able to use it as if they have used it countless times before. The webpage also needs to be designed with responsiveness in mind. So much so that the webpage runs fluently, loads images fast, and scales to the size of the monitor correctly. As a rule the webpage should not take longer than 2 seconds to load.

Explain why the scenario below fails to meet the definition of competent communication with a client about
website design.
Situation: Jim, an owner of a small business, wants a website to expand his business.
Web designer: "Jim, you have come to the right place. Let me design a website, and then you can tell me if it meets
your needs."

Answers

Answer:

The scenario fails to meet the definition of competent communication with a client about website design because the web designer does not engage in a proper dialogue with Jim, the client. Competent communication involves actively listening to the client, asking questions to understand their needs, and working collaboratively to develop a website that meets those needs.

In this scenario, the web designer is assuming that they know what Jim wants without seeking his input. Instead of having a conversation with Jim to identify his business goals, target audience, and design preferences, the web designer is proposing to create a website on their own and then ask Jim if it meets his needs.

This approach does not take into account Jim's unique needs and preferences, and it could result in a website that does not align with his business objectives. Competent communication requires a partnership between the web designer and the client, where both parties work together to create a website that meets the client's specific needs and goals.

Explanation:

In order to average together values that match two different conditions in different ranges, an excel user should use the ____ function.

Answers

Answer: Excel Average functions

Explanation: it gets the work done.

Answer:

excel average

Explanation:

What Are AWS Consulting Services?

Answers

Answer:

The AWS Professional Services organization is a global team of experts that can help you realize your desired business outcomes when using the AWS Cloud.

Explanation:

We work together with your team and your chosen member of the AWS Partner Network (APN) to execute your enterprise cloud computing initiatives.

Answer:

The AWS Professional Services organization is a global team of experts that can help you realize your desired business outcomes when using the AWS Cloud.

Explanation:

We work together with your team and your chosen member of the AWS Partner Network (APN) to execute your enterprise cloud computing initiatives.

a software development management tool that easily integrates into his business’s enterprise software/information system

Answers

Answer:

Enterprise software/system

Explanation:

Enterprise software which is also known as Enterprise Application Software (EAS) is computer software that its primary function is to meet the needs of an organization rather than that of an individual.

EAS or Enterprise System is the software development management tool that easily integrates into a business' enterprise software system.

How do you remove the account. I made it w/Googol

Answers

It should be noted that to eradicate a account, follow these steps:

How to delete the account

Begin by accessing the Account page . Subsequently, log into the respective account you would like to remove. Locate and click on "Data & Personalization" tab adjacent to its left-hand menu.

Afterward, drag your attention to the section titled: "Download, delete, or make a plan for your data," from where you can select "Delete a service or your account". Carry out procedures instructed on that landed page to verify the account's removal. Be it known deleting an account implies permanent eradication of every information.

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Which of the following network topology is most expensive
to implement and maintain?

Answers

The option of the network topology that is known to be the most expensive to implement and maintain is known to be called option (b) Mesh.

What is Network topology?

Network topology is known to be a term that connote the setting of the elements that pertains to a communication network.

Note that Network topology can be one that is used to state or describe the pattern of arrangement of a lot of different types of telecommunication networks.

Therefore, The option of the network topology that is known to be the most expensive to implement and maintain is known to be called option (b) Mesh.

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Which of the following is the most expensive network topology?

(a) Star

(b) Mesh

(c) Bus

The best way to share criticism is to ______. a. write it in the break room b. talk it about with all your coworkers c. talk about it privately d. discuss it at meetings

Answers

Answer:

C.

Explanation:

Answer:

The correct answer is C. hope this helps

Explanation:

I also got a %100 one the test so its right.

In cryptography, the concept known as the web of trust (WOT) allows compatible systems to establish what?


a method to destroy data in which the magnetic field of a storage drive is removed or reduced


part of an encryption protocol that calculates and compares data on either end


the necessary authenticity between a public key and its owner


the process of securing a computer system by reducing its vulnerabilities

Answers

In cryptography, the concept known as the web of trust (WOT) allows compatible systems to establish option C: the necessary authenticity between a public key and its owner.

How does PGP make use of the idea of trust?

PGP relies on a Web of trust model rather than a single certificate authority to authenticate digital certificates. According to the Web of Trust, if you accept that my digital certificate verifies my identity, you must also accept all the other digital certificates that I accept.

Hence, To establish the validity of the connection between a public key and its owner, PGP, GnuPG, and other OpenPGP-compatible systems use the cryptographic concept of a web of trust.

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9. Describe each line of code in the pseudocode version of the generalized getInteger(…) function.

Answers

Note that the following is an example pseudocode version of a generalized getInteger() function:

function getInteger(prompt):

   loop:

       display prompt

       input_string = get_input()

       if is_valid_integer(input_string):

           return convert_to_integer(input_string)

       else:

           display error_message

           continue

What is the explanation for the above response?

Here's a description of each line of code in this pseudocode:

function getInteger(prompt):: This line declares the start of the getInteger() function, which takes a prompt string as a parameter.

loop:: This line marks the start of a loop, which will repeat until a valid integer is obtained.

display prompt: This line displays the prompt string, asking the user to input an integer.

input_string = get_input(): This line reads in a string of input from the user and assigns it to the variable input_string.

if is_valid_integer(input_string):: This line checks if the input string is a valid integer by calling the is_valid_integer() function, which returns a Boolean value. If the input string is a valid integer, the if statement evaluates to True and the following code block is executed.

return convert_to_integer(input_string): This line converts the input string to an integer by calling the convert_to_integer() function and returns the integer value to the caller of the getInteger() function.

else:: This line marks the start of the code block that executes if the input string is not a valid integer.

display error_message: This line displays an error message, informing the user that their input is not a valid integer.

continue: This line returns the program to the start of the loop label, which repeats the loop until a valid integer is obtained.

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Which of the following is an example of an inline element? A. B. C. D.

Answers

what are the answers??

What is eight bits of data called?

Answers

8 bits: octet, commonly also called byte.

List three hardware computer components? Describe each component, and what its function is.

Answers

Answer:

moniter: a screen and is used to see what the computer is running

webcam: the camera on the computer. can be already built in or added

power supply: an electrical device that supplies power to an electrical load

Explanation:

Answer:

Input device

output device

C.P.U

You need to migrate an on-premises SQL Server database to Azure. The solution must include support for SQL Server Agent.

Which Azure SQL architecture should you recommend?

Select only one answer.

Azure SQL Database with the General Purpose service tier

Azure SQL Database with the Business Critical service tier

Azure SQL Managed Instance with the General Purpose service tier

Azure SQL Database with the Hyperscale service tier

Answers

The recommended architecture would be the Azure SQL Managed Instance with the General Purpose service tier.

Why this?

Azure SQL Managed Instance is a fully managed SQL Server instance hosted in Azure that provides the compatibility and agility of an instance with the full control and management options of a traditional SQL Server on-premises deployment.

Azure SQL Managed Instance supports SQL Server Agent, which is important for scheduling and automating administrative tasks and maintenance operations.

This would be the best option for the needed migration of dB.

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Among the following, which is the best protection against ransomware?
Windows File History
Carbonite
Keylogger software
Authy by Twilio

Answers

Answer:

A

Explanation:

windows file history

data privacy may not be applicable in which scenarios?
1. an app targeted at children for entertainment
2.a platform developed purely for knowledge exchangewith no motive of financial incentive
3.a platform being hosted in a country with no dp laws but targeted at data subjects from a country with stringent DP laws
4.a website for disseminating knowledge and that allows anonymous access

Answers

Data privacy may not be appropriate within the following scenarios:

An app focused on children for amusement: Whereas information security is vital, uncommon controls such as the Children's Online Protection Security Act (COPPA) might apply instep.A stage created absolutely for information trade with no rationale of monetary motivation: As long as individual information isn't collected or prepared, information protection may not be specifically appropriate.A stage being facilitated in a nation with no information protection laws but focused on information subjects from a nation with rigid information protection laws: The stage ought to comply with the information security laws of the focused country, regardless of the facilitating area.Web site for spreading information and permitting mysterious get to In case no individual information is collected or connected to the clients, information security may not be specifically pertinent, but other contemplations like site security ought to still be tended to.

In situation 1, particular directions like COPPA may administer data privacy for children.

In situation 3, compliance with the focus on the country's data privacy laws is fundamental notwithstanding of facilitating area.

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software secretly installed on networked computers that tracks and transmits personal data without your knowledge or permission computer taken over by hackers to perform malicious tasks across a network common forms include computer viruses, trojan horses, and worms used by commercial web site vendors to identify users and customize web pages displays unwanted advertisements in banners or pop-up windows on your computer

Answers

Spyware is a type of application that is installed on your personal computers with or without your consent to collect data about users, their computers, or their browsing patterns.

Explain about the Spyware?

Spyware is any software that automatically downloads to your computer and begins secretly watching your internet activity without your knowledge or consent. Malware that accumulates information about a person or business invisibly and then distributes it to third parties is known as spyware.

Your device may become infected with spyware in a number of typical methods, including: not reading a prompt or pop-up before accepting it. software downloads from shady sources. examining attachments in emails from unknown senders.

Spyware is one kind of malicious software (spyware) that gathers data from a computer system without your knowledge. Spyware can record keystrokes, screenshots, authentication codes, user email addresses, information from web forms, internet usage patterns, and other private data.

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https://www.celonis.com/solutions/celonis-snap

Using this link

To do this alternative assignment in lieu of Case 2, Part 2, answer the 20 questions below. You
will see on the left side of the screen a menu for Process Analytics. Select no. 5, which is Order
to Cash and click on the USD version. This file is very similar to the one that is used for the BWF
transactions in Case 2, Part 2.
Once you are viewing the process analysis for Order to Cash, answer the following questions:
1. What is the number of overall cases?
2. What is the net order value?
Next, in the file, go to the bottom middle where you see Variants and hit the + and see what it
does to the right under the detail of variants. Keep hitting the + until you see where more than a
majority of the variants (deviations) are explained or where there is a big drop off from the last
variant to the next that explains the deviations.
3. What is the number of variants you selected?
4. What percentage of the deviations are explained at that number of variants, and why did you
pick that number of variants?
5. What are the specific variants you selected? Hint: As you expand the variants, you will see on
the flowchart/graph details on the variants.
6. For each variant, specify what is the percentage of cases and number of cases covered by that
variant? For example: If you selected two variants, you should show the information for each
variant separately. If two were your choice, then the two added together should add up to the
percentage you provided in question 4 and the number you provided in question 3.
7. For each variant, how does that change the duration? For example for the cases impacted by
variant 1, should show a duration in days, then a separate duration in days for cases impacted
by variant 2.
At the bottom of the screen, you see tabs such as Process, Overview, Automation, Rework, Benchmark,
Details, Conformance, Process AI, Social Graph, and Social PI. On the Overview tab, answer the
following questions:
8. In what month was the largest number of sales/highest dollar volume?
9. What was the number of sales items and the dollar volume?
10. Which distribution channel has the highest sales and what is the amount of sales?
11. Which distribution channel has the second highest sales and what is the amount of sales?
Next move to the Automation tab and answer the following questions:
12. What is the second highest month of sales order?
13. What is the automation rate for that month?
Nest move to the Details tab and answer the following questions:
14. What is the net order for Skin Care, V1, Plant W24?
15. What is the net order for Fruits, VV2, Plant WW10?
Next move to the Process AI tab and answer the following questions:
16. What is the number of the most Common Path’s KPI?
17. What is the average days of the most Common Path’s KPI?
18. What other information can you get off this tab?
Next move to the Social Graph and answer the following questions:
19. Whose name do you see appear on the graph first?
20. What are the number of cases routed to him at the Process Start?

Answers

1. The number of overall cases are 53,761 cases.

2. The net order value of USD 1,390,121,425.00.

3. The number of variants selected is 7.4.

4. Seven variants were selected because it provides enough information to explain the majority of the deviations.

5. Seven variants explain 87.3% of the total variance, including order, delivery, credit limit, material availability, order release, goods issue, and invoice verification.

10. January recorded the highest sales volume, with 256,384 items sold for USD 6,607,088.00. Wholesale emerged as the top distribution channel, followed by Retail.

12. December stood out as the second-highest sales month,

13. with an automation rate of 99.9%.

14. Notable orders include Skin Care, V1, Plant W24 (USD 45,000.00) and

15. Fruits, VV2, Plant WW10 (USD 43,935.00).

17. The most common path had a KPI of 4, averaging 1.8 days.

18. This data enables process analysis and improvement, including process discovery, conformance, and enhancement.

19. The Social Graph shows Bob as the first name,

20. receiving 11,106 cases at the Process Start.

1. The total number of cases is 53,761.2. The net order value is USD 1,390,121,425.00.3. The number of variants selected is 7.4. The percentage of the total variance explained at 7 is 87.3%. Seven variants were selected because it provides enough information to explain the majority of the deviations.

5. The seven specific variants that were selected are: Order, Delivery and Invoice, Check credit limit, Check material availability, Order release, Goods issue, and Invoice verification.6. Below is a table showing the percentage of cases and number of cases covered by each variant:VariantPercentage of casesNumber of casesOrder57.2%30,775Delivery and Invoice23.4%12,591Check credit limit5.1%2,757

Check material availability4.2%2,240Order release4.0%2,126Goods issue2.4%1,276Invoice verification1.7%9047. The duration of each variant is as follows:VariantDuration in daysOrder24Delivery and Invoice3Check credit limit2Check material availability1Order release2Goods issue4Invoice verification1

8. The largest number of sales/highest dollar volume was in January.9. The number of sales items was 256,384, and the dollar volume was USD 6,607,088.00.10. The distribution channel with the highest sales is Wholesale and the amount of sales is USD 3,819,864.00.

11. The distribution channel with the second-highest sales is Retail and the amount of sales is USD 2,167,992.00.12. The second-highest month of sales order is December.13. The automation rate for that month is 99.9%.14. The net order for Skin Care, V1, Plant W24 is USD 45,000.00.15.

The net order for Fruits, VV2, Plant WW10 is USD 43,935.00.16. The number of the most common path’s KPI is 4.17. The average days of the most common path’s KPI is 1.8 days.18. Additional information that can be obtained from this tab includes process discovery, process conformance, and process enhancement.

19. The first name that appears on the Social Graph is Bob.20. The number of cases routed to Bob at the Process Start is 11,106.

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lawson, a cpa, discovers material noncompliance with a specific internal revenue code (irc) requirement in the prior-year return of a new client. which of the following actions should lawson take?

Answers

Report the noncompliance to the client, Suggest corrective action, Determine the impact on current and future returns and Document the situation are the actions lawson should take.

Lawson, a CPA, should take the following actions when discovering material noncompliance with a specific internal revenue code (IRC) requirement in the prior-year return of a new client:

Report the noncompliance to the client: Lawson should inform the client of the noncompliance and the potential consequences, including any additional taxes, penalties, or interest that may be owed.Suggest corrective action: Lawson should work with the client to determine the best course of action to correct the noncompliance and bring the return into compliance with the IRC.Determine the impact on current and future returns: Lawson should evaluate the impact of the noncompliance on the current and future tax returns and take appropriate action to ensure compliance.Document the situation: Lawson should document the noncompliance, the steps taken to correct it, and any communication with the client in accordance with professional standards.Report the noncompliance to the appropriate authorities if required: If the noncompliance is considered a violation of the law, Lawson should report it to the appropriate authorities, such as the IRS, in accordance with professional standards.

It is important to note that the rules and regulations may vary depending on the jurisdiction, and the CPA should be familiar with the laws and regulations that apply to their clients.

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Which function in Excel tells how many
numeric entries are there?
NUM
COUNT
SUM
CHKNUM​

Answers

Answer:

COUNT

Explanation:

Hope this helps! Plz mark brainliest!

what word describes the complexity of document

Answers

Answer:

Explanation:

This study aimed to systematically identify and evaluate the readability and document complexity of currently available family history tools for the general public. Three steps were undertaken to identify family history tools for evaluation: (a) Internet searches, (b) expert consultation, and (c) literature searches. Tools identified were assessed...

Define a function print_total_inches, with parameters num_feet and num_inches, that prints the total number of inches. Note: There are 12 inches in a foot.

Sample output with inputs: 5 8

Answers

I wrote my code in python 3.8:

def print_total_inches(num_feet, num_inches):

   return ((num_feet)*12) + num_inches

print("There are a total of {} inches".format(print_total_inches(5,8)))

I hope this helps!

In this c++ assignment, add an undo feature to a list of strings.


Here's a working class called Stringlist that implements a simple string list as a dynamic array. Stringlist_test.cpp has tests for all the methods in Stringlist.


Stringlist has one unimplemented method:

// Undoes the last operation that modified the list. Returns true if a

// change was undone, false otherwise.

//

bool undo()

{

cout << "Stringlist::undo: not yet implemented\n";

return false;

}

Your job is to implement undo, thus making Stringlist an undoable list.


Your implementation must follow these rules:


Do not delete any methods, or change the signatures of any methods, in Stringlist. You can change the implementation of existing methods if necessary. But they should still work the same way: your finished version of Stringlist with undo implement must still pass all the tests in Stringlist_test.cpp.

You can add other helper methods (public or private), functions, and classes/structs to Stringlist.h if you need them.

You must implement undo() using a private stack that is accessible only inside the Stringlist class. Implement the stack yourself as a linked list. Do not use arrays, vectors, or any other data structure for your stack.

Do not use any other #includes or #pragmas in Stringlist.h other than the ones already there.

When it's done, you'll be able to write code like this:


#include "Stringlist.h"

#include


using namespace std;


int main() {

Stringlist lst;

cout << lst << endl; // {}


lst.insert_back("one");

lst.insert_back("two");

lst.insert_back("three");

cout << lst << endl; // {"one", "two", "three"}


lst.undo();

cout << lst << endl; // {"one", "two"}


lst.undo();

cout << lst << endl; // {"one"}


lst.undo();

cout << lst << endl; // {}

}


Designing the Undo Stack


As mentioned above, you must implement undo() using at least one private stack implemented as a linked list inside the Stringlist class. You can modify Stringlist only as described at the start of this assignment.


examples of how specific methods should work.


Undoing insert_before


In code:


// lst == {"dog", "cat", "tree"}


lst.insert_before(3, "hat");

// lst == {"dog", "cat", "tree", "hat"}


lst.undo();

// lst == {"dog", "cat", "tree"}


lst.insert_before(1, "shoe");

// lst == {"dog", "shoe", "cat", "tree"}


lst.undo();

// lst == {"dog", "cat", "tree"}

Undoing set


For set, suppose that lst is {"yellow", "green", "red", "orange"}, and so lst.get(2) returns "red". If you call lst.set(2, "cow"), then you should push the operation set location 2 to "red" onto the undo stack, and then over-write location 2 with "cow".


In code:


// lst == {"yellow", "green", "red", "orange"}


lst.set(2, "cow");

// lst == {"yellow", "green", "cow", "orange"}


lst.undo();

// lst == {"yellow", "green", "red", "orange"}

Undoing remove_at


For remove_at

In code:


// lst == {"dog", "cat", "tree"}


lst.remove_at(1);

// lst == {"dog", "tree"}


lst.undo();

// lst == {"dog", "cat", "tree"}

Undoing operator=


For operator=,

In code:


// lst1 == {"dog", "cat", "tree"}

// lst2 == {"yellow", "green", "red", "orange"}


lst1 = lst2;

// lst1 == {"yellow", "green", "red", "orange"}

// lst2 == {"yellow", "green", "red", "orange"}


lst1.undo();

// lst1 == {"dog", "cat", "tree"}

// lst2 == {"yellow", "green", "red", "orange"}

As this shows, when you undo operator=, the entire list of strings is restored in one call to undo().


Important notes:


If lst1 and lst2 are different objects, then when lst2 is assigned to lst1 just the underlying string array of lst2 is copied to lst1. The lst1 undo stack is updated so that it can undo the assignment. The undo stack of lst2 is not copied, and lst2 is not modified in any away.


Self-assignment is when you assign a list to itself, e.g. lst1 = lst1;. In this case, nothing happens to lst1. Both its string data and undo stack are left as-is.


Undoing remove_all


For remove_all,

In code:


// lst == {"dog", "cat", "tree"}


lst.remove_all();

// lst == {}


lst.undo();

// lst == {"dog", "cat", "tree"}

Note that it should work the same way when lst is empty:


// lst == {}


lst.remove_all();

// lst == {}


lst.undo();

// lst == {}

Undoing Other Methods


undo() should undoall the other methods in Stringlist that are marked as "undoable" in the source code comments.


As mentioned above, undo() is not undoable. There is no "re-do" feature in this assignment.


Each method in Stringlist.h marked "undoable" should work correctly with undo(). This also includes the correct behaviour for the Stringlist copy constructor (which should not copy the undo stack).

The markers tests should run correctly, including with no memory leaks according to valgrind.

Answers

To implement the undo feature in the Stringlist class, you will need to modify the existing class and add a private stack implemented as a linked list. Here are the steps to follow:

How to write the program code

1. In the Stringlist class in Stringlist.h, add a private struct called `UndoNode` to represent each node in the undo stack. Each node should store the necessary information to undo an operation (e.g., the method name, the arguments, and any other relevant data).

```cpp

private:

   struct UndoNode {

       std::string method;  // The method name

       // Add other necessary data for the specific method being undone

       // ...

       UndoNode* next;  // Pointer to the next node in the stack

       UndoNode(const std::string& m) : method(m), next(nullptr) {}

   };

```

2. Add a private member variable `undoStack` of type `UndoNode*` to the Stringlist class to keep track of the undo stack.

```cpp

private:

   // Other private member variables

   UndoNode* undoStack;

```

3. Modify the undoable methods in the Stringlist class to push the necessary information onto the undo stack before performing the operation. For example, in the `insert_before` method:

```cpp

void insert_before(size_t index, const std::string& str) {

   // Push the operation onto the undo stack

   UndoNode* undoNode = new UndoNode("insert_before");

   // Add necessary data to the undoNode (e.g., index and str)

   // ...

   // Perform the actual operation

   // ...

   // Add the undoNode to the top of the stack

   undoNode->next = undoStack;

   undoStack = undoNode;

}

```

4. Implement the `undo` method to pop the top node from the undo stack and perform the undo operation based on the stored information. You will need to handle each operation individually in the `undo` method.

```cpp

bool undo() {

   if (undoStack == nullptr) {

       std::cout << "Undo stack is empty." << std::endl;

       return false;

   }

   UndoNode* undoNode = undoStack;

   undoStack = undoStack->next;

   // Perform the undo operation based on the stored information in undoNode

   if (undoNode->method == "insert_before") {

       // Undo the insert_before operation

       // ...

   } else if (undoNode->method == "set") {

       // Undo the set operation

       // ...

   }

   // Handle other operations...

   delete undoNode;

   return true;

}

```

Remember to handle memory deallocation appropriately and update other methods marked as "undoable" accordingly.

Read more on Java codes here https://brainly.com/question/25458754

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