Let L be the language over {a, b, c, d} accepting all strings so that: 1. All c's occur before the first b. 2. All d's occur after the first b. 3. The last symbol of the string is a. 4. Each a that is not the last symbol is immediately followed by an even number of d's.
Choose any constructive method you wish, and demonstrate that Lis regular. You do not need an inductive proof, but you should explain how your construction accounts for each rule.
Answers
Answer:
We made use of the Regular expression and justification as a constructive method that showed that L is regular.
Explanation:
Solution
Regular Expression:
( c + a )* b d*( a (dd)* + bd*)* a
Justification:
All c's occur before the first b, there can be a's as well
So, we have (c + a)*
(dd)* for even number of d's
Related Questions
General-purpose processes are optimized for general-purpose computing. That is, they are optimized for behavior that is generally found across a large number of applications. However, once the domain is restricted somewhat, the behavior that is found across a large number of the target applications may be different from
Answers
However, once the domain of a general purpose processor is restricted, the behavior which is found across a large number of the target applications may be different from:
General-purpose applicationsWhat is a General Purpose Process?This refers to the implementation of the address block of the interpreter which stores data in the fast memory register that aids in the execution of instructions in a program.
With this in mind, we can see that some examples of a general purpose application includes Deep Learning and Neural Networks which can be optimized to improve decision making.
This shows that once the domain is restricted, then there would be different behavior in the general purpose applications.
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What is a conditional Statement that causes the program to change its course
Answers
Answer:
In computer science, conditional statements, conditional expressions and conditional constructs are features of a programming language, which perform different computations or actions depending on whether a programmer-specified boolean condition evaluates to true or false.
Explanation:
What is the value of the variable result after these lines of code are executed?
>>> a = 12
>>> b = 0
>>> c = 2
>>> result = a * b - b / c
Answers
Answer:
>>> a = 12
>>> b = 0
>>> c = 2
>>> result = a * b - b / c
>>> result
0
Explanation:
The expression a * b - b / c is evaluated as follows:
a * b is evaluated first, which is 12 * 0 = 0.
b / c is evaluated next, which is 0 / 2 = 0.
The two expressions are then subtracted, which is 0 - 0 = 0.
The result of the subtraction is then stored in the variable result.
Database systems are exposed to many attacks, including dictionary attack, show with implantation how dictionary attack is launched?(Java or Python) ?
Answers
A type of brute-force attack in which an intruder uses a "dictionary list" of common words and phrases used by businesses and individuals to attempt to crack password-protected databases.
What is a dictionary attack?
A Dictionary Attack is an attack vector used by an attacker to break into a password-protected system by using every word in a dictionary as a password for that system. This type of attack vector is a Brute Force Attack.
The dictionary can contain words from an English dictionary as well as a leaked list of commonly used passwords, which, when combined with common character replacement with numbers, can be very effective and fast at times.
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How many outcomes are possible in this control structure?
forever
if
is A button pressed then
set background image to
else
set background image to
Answers
Answer:
In the given control structure, there are two possible outcomes:
1) If the condition "Is A button pressed?" evaluates to true, then the background image will be set to a specific value.
2) If the condition "Is A button pressed?" evaluates to false, then the background image will be set to another value.
Therefore, there are two possible outcomes in this control structure.
Hope this helps!
Jose is very careful about preventing malware from infecting his computer. In addition to avoiding suspicious email attachments and resisting the
temptation of clicking on pop-up ads, which of the following methods could Jose use to keep his computer safe?
Answers
Answer: There is many apps on the computer that may help Jose. Look up malware or software protection and perhaps you'll find one you like and that fits his computer. I hope this helps Jose!!!
Explanation:
Many adds pop up for safety and protection for your computer, the hard part is knowing which ones are true and which ones are false! I wouldn't risk buying any plans in that area unless your positive they are real. There are free apps that can help you without paying for them. I hope this helps!
What is true about the pivot in Quicksort? Group of answer choices After partitioning, the pivot will always be in the center of the list. After partitioning, the pivot will never move again. Before partitioning, it is always the smallest element in the list. A random choice of pivot is always the optimal choice, regardless of input.
Answers
Answer:
The pivot is selected randomly in quick sort.
While setting up annetwork segment you want to check the functionality cable before putting connectors on them. You also want to meaure the termination point or damange in cable which tool used
Answers
A network is divided into several parts (subnets) using network segmentation, which creates smaller, independent networks for each segment.
What is network Segementation?Segmentation works by regulating the network's traffic flow. The term "network segmentation" should not be confused with "microsegmentation," which limits east-west communication at the workload level in order to lower an organization's network attack surface.
Despite having some uses, microsegmentation should not be confused with standard network segmentation.
A network is divided into several zones via network segmentation, and each zone or segment is independently managed. To regulate what traffic is allowed to pass through the segment and what is not, traffic protocols must be used.
Dedicated hardware is used to create network segments that are walled off from one another and only permit users with the proper credentials to access the system.
Therefore, A network is divided into several parts (subnets) using network segmentation, which creates smaller, independent networks for each segment.
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In "PUBATTLEGROUNDS” what is the name of the Military Base island?
Answers
Answer:
Erangel
Explanation:
Answer:
Erangel
Explanation:
The Military Base is located on the main map known as Erangel. Erangel is the original map in the game and features various landmarks and areas, including the Military Base.
The Military Base is a high-risk area with a significant amount of loot, making it an attractive drop location for players looking for strong weapons and equipment. It is situated on the southern coast of Erangel and is known for its large buildings, warehouses, and military-themed structures.
The Military Base is a popular destination for intense early-game fights due to its high loot density and potential for player encounters.
Hope this helps!
Assume you have been contracted by a university to develop a database system to keep track of student registration and accommodation records. The university courses are offered by faculties. Depending on the student’s IQ, there are no limitations to how many courses a student can enroll in. The faculties are not responsible for student accommodation. The university owns a number of hostels and each student is given a shared room key after enrollment. Each room has furniture attached to it. (a) Identify the main entity types for the project. (b) Identify the main relationship types and specify the multiplicity for each relationship. State any assumptions that you make about the data. (c) Using your answers for (a) and (b), draw a single ER diagram to represent the data requirements for the project
Answers
Answer:
Explanation:
(a) The main entity types for the project are:
StudentCourseFacultyHostelRoomFurniture(b) The main relationship types and their multiplicities are:
One student can enroll in many courses (1 to many)One course can be taken by many students (1 to many)One faculty can offer many courses (1 to many)One course can be offered by one faculty (1 to 1)One hostel can have many rooms (1 to many)One room can be assigned to many students (1 to many)One room has many pieces of furniture (1 to many)One piece of furniture can be in one room only (1 to 1)Assumptions:
A student can only be assigned to one room.Each piece of furniture can only be in one room.(c) Here's a diagram that represents the data requirements for the project:
** ATTACHED **
The diagram shows the relationships between the entities, with the multiplicities indicated by the symbols at the ends of the lines connecting them.
The main entity types for this project would be Faculty, Student, Course, Room, and Furniture.
(a) The main entity types for the project are:
- Faculty
- Student
- Course
- Room
- Key
- Furniture
(b) The main relationship types and their multiplicities are as follows:
- Faculty offers courses (1:N)
- Students enroll in courses (M:N)
- Students hold a room key (1:1)
- Rooms have attached furniture (1:N)
Assumptions:
- Each student can enroll in multiple courses.
- The faculty is not responsible for student accommodation.
- Each room has furniture attached to it.
(c) See below for the ER diagram:
ER Diagram
Hence, the main entity types for this project would be Faculty, Student, Course, Room, and Furniture.
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Complete the method, isPerfectSquare(). The method takes in a positive integer, n. It returns a boolean that is true if n is a perfect square, false otherwise. A perfect square is an integer whose square root is also an integer. You may assume that n is a positive integer.
Hint: find the square root of n, cast it to an int value, then square it and compare this square to n.
Starter code:-
public class Square {
public static boolean isPerfectSquare(int n) {
//TODO: complete this method
}
}
Answers
Answer:
public class Square { public static boolean isPerfectSquare(int n){ int sqrt_n = (int) Math.sqrt(n); if(sqrt_n * sqrt_n == n ){ return true; }else{ return false; } } }Explanation:
Firstly, use sqrt method from Math package to calculate the square root of input n (Line 3). Cast the result to integer and assign it to sqrt_n variable.
Next, square the sqrt_n and check if it is equal to input n (Line 4). If so, return true, if not, return false (Line 4-8).
We can save our data peremently on a
Answers
Explanation: It is much like a flash drive with larger storage space
Hope this helps
Write a program to read from std_info.txt.
This file has student first name, last name, major, and gpa.
This program must compute the average gpa of ee, cpe, and all students in the file. you must write in student_avg.txt file, the student information and computed gpa at the bottom of the list of students in the following order:
Sam Thomas CPE 3.76Mary Smith EE 2.89John Jones BUS 4.00....EE average =CPE average =Total average =
Answers
Answer:
import pandas as pd
# loads the text file as a pandas dataframe
student_file = pd.read_fwf("std_info.txt")
# opens a new text file if the student_avg does not exist
# the file closes automatically at the end of the with statement
with open('student_avg.txt', 'w+') as file:
for row in student_file.iterrows():
file.write(row)
ee = student_file[student_file['major'=='EE']]
cpe = student_file[student_file['major'=='CPE']]
file.write(f'EE average = {ee['EE'].mean()}')
file.write(f'CPE average = {ee['CPE'].mean()}')
file.write(f'Total average = {student_file['EE'].mean()}')
Explanation:
The python program gets the text file as a fixed-width file and loads the file as a pandas dataframe. The dataframe is used to get the total average GPA the student GPA and the average GPA of students in various departments. The results are saved in a new file called 'student_avg.txt'.
AnimalColony is a class with one int* and one double* data member pointing to the population and growth rate of the animal colony, respectively. An integer and a double are read from input to initialize myAnimalColony. Write a copy constructor for AnimalColony that creates a deep copy of myAnimalColony. At the end of the copy constructor, output "Called AnimalColony's copy constructor" and end with a newline.
Ex: If the input is 20 1.00, then the output is:
Called AnimalColony's copy constructor
Initial population: 20 penguins with 2.00 growth rate
Called AnimalColony's copy constructor
After 1 month(s): 60 penguins
After 2 month(s): 180 penguins
Custom value interest rate
20 penguins with 1.00 growth rate
#include
#include
using namespace std;
class AnimalColony {
public:
AnimalColony(int startingPopulation = 0, double startingGrowthRate = 0.0);
AnimalColony(const AnimalColony& col);
void SetPopulation(int newPopulation);
void SetGrowthRate(double newGrowthRate);
int GetPopulation() const;
double GetGrowthRate() const;
void Print() const;
private:
int* population;
double* growthRate;
};
AnimalColony::AnimalColony(int startingPopulation, double startingGrowthRate) {
population = new int(startingPopulation);
growthRate = new double(startingGrowthRate);
}
void AnimalColony::SetPopulation(int newPopulation) {
*population = newPopulation;
}
void AnimalColony::SetGrowthRate(double newGrowthRate) {
*growthRate = newGrowthRate;
}
int AnimalColony::GetPopulation() const {
return *population;
}
double AnimalColony::GetGrowthRate() const {
return *growthRate;
}
void AnimalColony::Print() const {
cout << *population << " penguins with " << fixed << setprecision(2) << *growthRate << " growth rate" << endl;
}
void SimulateGrowth(AnimalColony c, int months) {
for (auto i = 1; i <= months; ++i) {
c.SetPopulation(c.GetPopulation() * (c.GetGrowthRate() + 1.0));
cout << "After " << i << " month(s): " << c.GetPopulation() << " penguins" << endl;
}
}
int main() {
int population;
double growthRate;
cin >> population;
cin >> growthRate;
AnimalColony myAnimalColony(population, growthRate);
AnimalColony myAnimalColonyCopy = myAnimalColony;
myAnimalColony.SetGrowthRate(growthRate + 1.0);
cout << "Initial population: ";
myAnimalColony.Print();
SimulateGrowth(myAnimalColony, 2);
cout << endl;
cout << "Custom value interest rate" << endl;
myAnimalColonyCopy.Print();
return 0;
}
Answers
Copying a savings account to another. This assumes that the copy function Object() { [native code] } of the savings account class takes a reference to another savingsaccount object as its parameter.
What is the code to make copy function Object?The code to make a deep duplicate of a savings account object using the copy function Object() { [native code] } might resemble this, assuming the class definition for savings account has previously been established with the relevant data members and methods are scss and Code copy.
double growthRate;
cin >> population;
cin >> growthRate;
AnimalColony myAnimalColony(population, growthRate);
AnimalColony myAnimalColonyCopy = myAnimalColony;
Therefore, Copying a savings account to another. This assumes that the copy function Object() { [native code] } of the savings account class takes a reference to another savingsaccount object as its parameter.
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If each integer occupies one 64-bit memory cell and is stored using sign/magnitude notation, what are the largest (in terms of absolute value) positive and negative integers that can be stored?
Answers
Answer:
2^63 = 9 223 372 036 854 775 808
Explanation:
Of 64 bits, one is used to store the sign. The rest of 63 bits is used to store the absolute value. The maximum value of n-digit number of base b is b^n.
We are using bits which represent binary (base 2) digits. Base b = 2, digits/bits n = 63. The maximum number is 2^63.
Which of the following is used to replicate attacks during a vulnerability assessment by providing a structure of exploits and monitoring tools?
a) replication image
b) penetration framework c) assessment image
d) exploitation framework
Answers
A vulnerability is a flaw in a system, procedure, or architectural design that could result in compromised data or unauthorized access. Exploiting is the process of taking advantage of a weakness. Thus, option D is correct.
What exploitation framework, vulnerability assessment?Software packages known as “exploitation frameworks” are supported and come with trustworthy exploit modules in addition to other useful features like agents for successful repositioning.
Therefore, exploitation framework is used to replicate attacks during a vulnerability assessment by providing a structure of exploits and monitoring tools.
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Write a BASH script to create a user account. The script should process two positional parameters: o First positional parameter is supposed to be a string with user name (e.g., user_name) o Second positional parameter is supposed to be a string with user password (e.g., user_password) The script should be able to process one option (use getopts command): o Option -f arg_to_opt_f that will make your script direct all its output messages to file -arg_to_opt_f
Answers
#!/bin/bash
usage() {
echo "Usage: $0 [ -f outfile ] name password" 1>&2
exit 1
}
while getopts "f:" o; do
case "${o}" in
f)
filename=${OPTARG}
;;
*)
usage
;;
esac
done
shift $((OPTIND-1))
name=$1
password=$2
if [ -z "$password" ] ; then
usage
fi
set -x
if [ -z "$filename" ] ; then
useradd -p `crypt $password` $name
else
useradd -p `crypt $password` $name > $filename
fi
Cryptography is an example of which part of the CIA triad?
Availability
Confidentiality
Integrity
Truthfulness
Answers
Cryptography is an example of ensuring Confidentiality in the CIA triad. (Option B)
How is this so?Cryptography is an essentialcomponent of ensuring Confidentiality within the CIA triad.
It involves the use of encryption techniques to protect sensitive information from unauthorized access.
By converting data into an unreadable format, cryptography ensures that only authorized individuals with the necessary decryption keys can access and understand the information,preserving its confidentiality and preventing unauthorized disclosure.
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which of the following types of viruses target systems such as supervisory control and data acquisition systems, which are used in manufacturing, water purification, and power plants?
Answers
It's thought that Stuxnet seriously harmed Iran's nuclear program by focusing on supervisory control and data acquisition (SCADA) systems.Several types of computer viruses.
What are the 4 types of computer viruses?It's thought that Stuxnet seriously harmed Iran's nuclear program by focusing on supervisory control and data acquisition (SCADA) systems.Several types of computer viruses.Boot Sector Virus.A sector of your hard drive on your computer is entirely in charge of directing the boot loader to the operating system so it can start up.A browser hijacker, a web scripting virus, etc.Virus in residence.A rootkit is software that allows malevolent users to take complete administrative control of a victim's machine from a distance.Application, kernel, hypervisor, or firmware injection can all result in rootkits.Phishing, malicious downloads, malicious attachments, and infected shared folders are all ways they spread. ]To learn more about computer viruses refer
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What is the proper order for the fetch-execute cycle?
A) fetch, decode, execute, store
B) store, fetch, execute, decode
C) fetch, execute, decode, store
D) fetch, store, decode, execute
Answers
Answer:
A. fetch, decode,execute, store
The fetch-execute cycle is a computer's fundamental operation cycle. The correct option is A.
What is a fetch-execute cycle?The fetch-execute cycle is a computer's fundamental operation (instruction) cycle (also known as the fetch decode execute cycle). The computer obtains a software instruction from memory during the fetch execute cycle. It then establishes and executes the activities necessary for that instruction.
The proper order for the fetch-execute cycle, decode, execute, store.
Hence, the correct option is A.
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An ________meter is an electronic device used to measure hearing sensitivity by delivering a series of acoustic tones that cover a range of frequencies. A. audio B. audito
C. electroaudio D. electroaudito
Answers
Answer: audio
Explanation:
write algorithm to find (a+b)^2=(a+b)*(a+b)
Answers
Answer:
Basically
(a+b)^2 = a^2 + b^2 + 2ab
Explanation:
steps
1: start
2: read a value
3: read b value
4: c=(a+b)*(a+b);
5: print c value
6:end
The geographic coordinate system is used to represent any location on Earth as a combination of latitude and longitude values. These values are angles that can be written in the decimal degrees (DD) form or the degree, minutes, seconds (DMS) form just like time. For example, 24.5° is equivalent to 24°30'00''. Write a MATLAB script that will prompt the user for an angle in DD form and will print in sentence format the same angle in DMS form. The script should error-check for invalid user input. The angle conversion is to be done by calling a separate function in the script.
Answers
Answer:
Here is the script:
function dd = functionDMS(dd)
prompt= 'Enter angle in DD form ';
dd = input(prompt)
while (~checknum(dd))
if ~checknum(dd)
error('Enter valid input ');
end
dd = input(prompt)
end
degrees = int(dd)
minutes = int(dd - degrees)
seconds = ( dd - degrees - minutes / 60 ) * 3600
print degrees
print minutes
print seconds
print dd
Explanation:
The script prompts the user to enter an angle in decimal degree (DD) form. Next it stores that input in dd. The while loop condition checks that input is in valid form. If the input is not valid then it displays the message: Enter valid input. If the input is valid then the program converts the input dd into degrees, minutes and seconds form. In order to compute degrees the whole number part of input value dd is used. In order to compute the minutes, the value of degrees is subtracted from value of dd. The other way is to multiply remaining decimal by 60 and then use whole number part of the answer as minutes. In order to compute seconds subtract dd , degrees and minutes values and divide the answer by 60 and multiply the entire result with 3600. At the end the values of degrees minutes and seconds are printed. In MATLAB there is also a function used to convert decimal degrees to degrees minutes and seconds representation. This function is degrees2dms.
Another method to convert dd into dms is:
data = "Enter value of dd"
dd = input(data)
degrees = fix(dd);
minutes = dd - degrees;
seconds = (dd-degrees-minutes/60) *3600;
For which of the following values of A and B will the expression A || B be true?
A = False, B = False
Both A and B must be true
The expression is impossible to be true no matter the values of A and B.
A = False, B = True
Answers
Answer:
A = False, B = True
Explanation:
|| is equal OR. To the expression be true, you need one of them to be true or both.
A = TRUE, B = FALSE
Returns true
A = FALSE, B = FALSE
Returns true
A = TRUE, B = TRUE
Returns true
For a company, intellectual property is _______________.
A) any idea that the company wants to keep secret
B) the same as the company’s policies
C) any topic discussed at a meeting of senior management
D) all of the company’s creative employees
E) a large part of the company’s value
Answers
For a company, intellectual property is any idea that the company wants to keep secret. Thus the correct option is A.
What is intellectual Property?The type of integrity is defined as "intellectual property" which includes intangible works developed by humans with an innovative and problem-solving approach.
These intellectual properties are protected by companies to avoid leakage of the secret of development as well as to avoid imitation of the creation. This protection of the intellectual property is legally bounded.
If any violation of this act has been noticed and found guilty will have to face consequences in terms of charges of violation as well as heavy penalties based on the type and importance of the work.
Therefore, option A any idea that the company wants to keep secret is the appropriate answer.
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Ashton Auto Place is a car dealer for new as well as used cars of all makes. It uses computerized Transaction Processing System (TPS) to process car sale transactions. Whenever Salesperson sells a Car, the Salesperson enters sales data (which includes customer information, details of the car sold, and sales information) into the TPS. The system prints sales invoice for the customer, daily sales statement for each Salesperson, and prints reports for management. Using the above described business scenario do following:
(a). Draw the context-level Data Flow Diagram (DFD) for the TPS
(b). Identify the entities for which system need to save data into database
Then draw entity relationship diagram (ERD). using MS word
Answers
Answer:
(b)
Explanation:
John typed 350 word in 25 minute. What is his typing speed.
Answers
Answer:
14 works per min
Explanation:
350 divided by 25 equals 14
What feature allows a person to key on the new lines without tapping the return or enter key
Answers
The feature that allows a person to key on new lines without tapping the return or enter key is called word wrap
How to determine the featureWhen the current line is full with text, word wrap automatically shifts the pointer to a new line, removing the need to manually press the return or enter key.
In apps like word processors, text editors, and messaging services, it makes sure that text flows naturally within the available space.
This function allows for continued typing without the interruption of line breaks, which is very helpful when writing large paragraphs or dealing with a little amount of screen space.
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And office now has a total of 35 employees 11 were added last year the year prior there was a 500% increase in staff how many staff members were in the office before the increase
Answers
There were 5 staff members in the office before the increase.
To find the number of staff members in the office before the increase, we can work backward from the given information.
Let's start with the current total of 35 employees. It is stated that 11 employees were added last year.
Therefore, if we subtract 11 from the current total, we can determine the number of employees before the addition: 35 - 11 = 24.
Moving on to the information about the year prior, it states that there was a 500% increase in staff.
To calculate this, we need to find the original number of employees and then determine what 500% of that number is.
Let's assume the original number of employees before the increase was x.
If we had a 500% increase, it means the number of employees multiplied by 5. So, we can write the equation:
5 * x = 24
Dividing both sides of the equation by 5, we find:
x = 24 / 5 = 4.8
However, the number of employees cannot be a fraction or a decimal, so we round it to the nearest whole number.
Thus, before the increase, there were 5 employees in the office.
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Could anyone help :)
Answers
Answer:
2
Explanation:
This code segment iterates through the array checks to see if each element equals y if so, increments the counter variable count
Essentially, this code is taking in two parameters an array x and an integer y and counting the number of times y appears in the array x
look(numList, 1) counts the number of times the integer 1 appears in numList
1 appears two times and therefore 2 is the value returned by the function and therefore the answer