Answer:
See explaination for the program code
Explanation:
code:
public static int[] countLastDigits(int[] list) {
int[] count = new int[10];
for (int i = 0; i < list.length; i++) {
int digit = list[i] % 10;
count[digit]++;
}
return count;
}
The program which counts the number of elements with ends with a certain digit is given below with, elements ending with 0 as index, 1 and so on.
public static int[] countLastDigits(int[] list) {
#initializes a function named countLastDigits
int[] count = new int[10];
for (int i = 0; i < list.length; i++) {
#a for loop to iterate over the array created
int digit = list[i] % 10;
count[digit]++;
#appends to counts variable
}
return count;
}
Learn more : https://brainly.com/question/18478903
A computer supply company is located in a building with three wireless networks.
The system security team implemented a quarterly security scan and saw the following.
SSIDStateChannelLevel
Computer AreUs1connected170dbm
Computer AreUs2connected580dbm
Computer AreUs3connected375dbm
Computer AreUs4connected695dbm
Which of the following is this an example of?
A. Rogue access point
B. Near field communication
C. Jamming
D. Packet sniffing
Answer:
A. Rogue access point
Explanation:
A rogue access point is defined as a wireless access point installed on a secure network infrastructure without consent of the owner of the network or without due authorization. While this can sometimes be added by a malicious attacker, it is most commonly set up by employees with the desire to have wireless access even when there is any available.
In the question, there are three wireless networks, but on scanning, five wireless networks were found, hence they are rogue access point.
Which of the following are ways a vote thief could cast multiple votes in an online election? (check all that apply)
a. Using a DoS attack to make a legitimate vote server unavailable and direct voters to fake vote servers
b. Purchasing pass codes from people willing to sell their right to vote
c. Setting up fake vote servers to collect pass codes of voters
d. Using social engineering techniques to get pass codes from targeted voters
Answer:
All of the given options apply and are correct.
Explanation:
a) The first option is correct because the intruder can use denial-of-service attack and by flooding the site with traffic to get the voter server unavailable. Then he can direct the voters to a fraud vote server.
b) The second options correctly applies too because the thief also buys the pass codes from the people who want to sell their right to vote and this way the thief can purchase multiple pass code and cast multiple votes.
c) The hackers can set up fake vote servers and then direct the voters to these servers or websites in order to collect pass codes of voters. These pass codes can then be misused by the thief to cast multiple votes in an online election.
d) Social engineering techniques can also be used to get pass codes from certain voters. By manipulating the targeted voters psychologically they can get their pass codes to cast multiple votes illegally.
Write a function flush that takes as input a list of five cards, tests whether it is a flush (Note: straight flush is not a flush!) and return a boolean value. If the entry is anything other than five distinct cards, it should return (not print!) the message "This is not a valid poker hand".
Answer:
Explanation:
ef poker(hands):
scores = [(i, score(hand.split())) for i, hand in enumerate(hands)]
winner = sorted(scores , key=lambda x:x[1])[-1][0]
return hands[winner]
def score(hand):
ranks = '23456789TJQKA'
rcounts = {ranks.find(r): ''.join(hand).count(r) for r, _ in hand}.items()
score, ranks = zip(*sorted((cnt, rank) for rank, cnt in rcounts)[::-1])
if len(score) == 5:
if ranks[0:2] == (12, 3): #adjust if 5 high straight
ranks = (3, 2, 1, 0, -1)
straight = ranks[0] - ranks[4] == 4
flush = len({suit for _, suit in hand}) == 1
'''no pair, straight, flush, or straight flush'''
score = ([1, (3,1,1,1)], [(3,1,1,2), (5,)])[flush][straight]
return score, ranks
>>> poker(['8C TS KC 9H 4S', '7D 2S 5D 3S AC', '8C AD 8D AC 9C', '7C 5H 8D TD KS'])
'8C AD 8D AC 9C'
A developer is creating an enhancement to an application that will allow people to be related to their employer. Which data model should be used to track the data? A. Create a junction object to relate many people to many employers through master-detail relationships B. Create a lookup relationship to indicate that a person has an employer C. Create a junction object tolerate many people to many employers through lookup relationships D. Create a master-detail relationship to indicate that a person has an employer
The correct data model for tracking the relationship between people and their employers, allowing for many-to-many relationships, is to create a junction object with master-detail relationships.
Explanation:The question is asking which data model should be used to track the relationship between people and their employers in an application enhancement. The appropriate data model to use in this scenario is A. Create a junction object to relate many people to many employers through master-detail relationships. This solution allows for the creation of a many-to-many relationship between people and employers, which is necessary if employees can work for multiple employers and employers can have multiple employees.
In Salesforce, a junction object is a custom object with two master-detail relationships, and it's the standard way to handle many-to-many relationships. A lookup relationship (B. Create a lookup relationship to indicate that a person has an employer) is used for one-to-many relationships, which does not fit the requirement if an employee can have multiple employers or vice versa. Option C mentions using lookup relationships in a junction object, which is inaccurate since a junction object by definition uses master-detail relationships. D. Create a master-detail relationship to indicate that a person has an employer also does not suffice as it represents a one-to-many model. Therefore, option A is the correct choice for this enhancement.
Write a method named countMatching(). It has two parameters: a String and a character. The method returns a count of how many times the character parameter appears in the String parameter. Case matters. For example, 'A' is not the same as 'a'. You only need to write the countMatching() method and nothing else (do not modify the main() method provided below). Note, however, that your method must work for any parameters passed, not just the example below.
Answer:
Check the explanation
Explanation:
public static int countMatching(String s, char c) {
int count = 0;
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == c)
++count;
}
return count;
}
Method in a complete Java program
public class FizzBuzz {
/* sample run:
* z appears 2 time(s) in FIZZbuzz
*/
public static void main(String[] args) {
String s = "FIZZbuzz";
char c = 'z';
int count = countMatching(s, c);
System.out.printf("%c appears %d time(s) in %s%n", c, count, s);
}
// Put your countMatching() method here:
public static int countMatching(String s, char c) {
int count = 0;
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == c)
++count;
}
return count;
}
}
z appears 2 time(s) in FIZZbuzz Process finished with exit code
Chose the number from following, and using Quadratic Selection Sort, the size of the auxiliary file is_____ . The first value in the auxiliary file is _______and the fourth value is______ , if you start counting with one, not zero. The largest value in the auxiliary file will be replaced with _______. The largest remaining value will be replaced with_______
40 73 43 64 25 82 37 49 58 76 67 85 28 46 88 61 19 52 70 31 79 55 22 34 16
Answer:
25, 40, 64, 16, 34
Explanation:
the size of the auxiliary file is 25
The first value in the auxiliary file is 40
the fourth value is 64
Largest value will be replaced with 16
The largest remaining value will be replaced with 34
Suppose you are given a sequence or array of n real numbers (a1, a2, . . . , an), all distinct. We are interested in sorting this list, and ideally sorting it as efficiently as possible / with minimal effort. All information relevant to sorting a list can be thought of as contained in the order permutation. If a list (a1, a2, a3) has an ordering permutation of (3, 1, 2), that would mean a3 ≤ a1 ≤ a2, hence, the sorted form of the list would be (a3, a1, a2). This permutation encodes how all the elements compare to one another.
1) How many possible ways could a list of n values be ordered, i.e., how many ordering permutations are there?
2) Argue that if you know a list’s order permutation, sorting is easy (linear time), and conversely, if you know the steps to sort the list, you can easily generate the order permutation.
3) Given this, argue that sorting can’t be easier than finding the order permutation.
4) If every element comparison (testing where ai ≤ aj ) provides at most one bit of information, argue that in order to be able to sort any list, you need to perform at least approximately log2 (n!) many comparisons.
5) Based on the prior result, argue that merge sort is, asymptotically, as or more efficient than any other sorting algorithm.
Answer:
1. n
2. we can slect that permutation without any comparison and the array wil be sorted in to one time.
3. we cannot sort the list without any comparision test.
Explanation:
1. The total number of permutations available are n! because there are ' n ' distinct elements in an array.
2. Here we are given the total ordering permutations, among those available permutations there will be one permutation in which all the elements of the array are sorted. so, we can slect that permutation without any comparison and the array wil be sorted in to one time.
3. If there is no total ordering permutation then we cannot sort the list without any comparision test. In this case we should know the the number of inversion required to see the array. Based on the permutations we can select the permutation which requires minimum inversions. Here inversion sort works well.
See attachment for the details of 4 and 5.
Problem 1 (Authentication): Consider the following authentication protocol, which uses a classical cryptosystem. Alice generates a random message r, enciphers it with the key k she shares with Bob, and sends the enciphered message {r}k to Bob. Bob deciphers it, adds 1 to r, and sends {r + 1}k back to Alice. Alice deciphers the message and compares it with r. If the difference is 1, she knows that her correspondent shares the same key k and is therefore Bob. If not, she assumes that her correspondent does not share the key k and so is not Bob. Does this protocol authenticate Bob to Alice? If so, Why? Otherwise, explain why not.
Answer:
Check the explanation
Explanation:
Yes, going by the question above, the protocol validates Bob to Alice for the reason that the key is only shared between Bob and Alice as well as the number which is being sent randomly. Therefore the invader won’t be able to predict and response to that number. Because of the authentication protocol, that makes use of a classical cryptosystem thereby resulting into the possibility of an argument such that key finding is attainable via invader.
Final answer:
While the described protocol aims to authenticate Bob to Alice using a shared symmetric key, it doesn't guard against a man-in-the-middle attack wherein the attacker could intercept and relay the encrypted messages without either party knowing, thereby failing to provide foolproof authentication.
Explanation:
The proposed authentication protocol attempts to authenticate Bob to Alice by having Alice generate a random message r, encrypt it using a shared symmetric key k, and send it to Bob. Bob then decrypts the message, increments r by 1, and sends it back to Alice in encrypted form using the same key. Alice will determine the authenticity of Bob if the decrypted message equals r + 1.
This protocol assumes that only Alice and Bob share the symmetric key k and that any interception or alteration of the messages would lead to an incorrect response from a non-authentic party. However, this method does not fully protect against a man-in-the-middle attack, where an attacker could intercept the initial message from Alice, decrypt it, increment, re-encrypt using a key known to the attacker, and forward it to Bob, then doing the reverse of this process when Bob replies. This would give Alice the impression that she is communicating with Bob when in fact the attacker is relaying the messages.
Additionally, without a way to ensure that the key hasn't been compromised or a method to spot interception, such as with cryptographic hashes, the protocol does not provide a robust authentication mechanism against all potential attacks. Public key cryptography and cryptographic hash functions are examples of technologies that can improve the authentication process by enabling secure key exchanges and providing a way to verify the integrity and authenticity of a communication.
The cost of an international call from New York to New Delhi is calculated as follows: Connection fee, $1.99; $2.00 for the first three minutes; and $0.45 for each additional minute. Write a program that prompts the user to enter the number of minutes the call lasted and outputs the amount due. Format your output with 2 decimal places c++
Answer:
#include <iostream>
using namespace std;
int main()
{
double minutes, cost = 0;
cout<<"Enter the number of minutes: ";
cin >> minutes;
if (minutes <= 3)
cost = 1.99 + (minutes * 2);
else
cost = 1.99 + (2 * 3 + (minutes - 3) *0.45);
cout <<"The cost is: " << cost <<endl;
return 0;
}
Explanation:
Declare the variables
Ask the user for the minutes
Check the minutes:
If it is less than or equal to 3, calculate the cost by summing multiplication of the minutes by 2 and 1.99
Otherwise, calculate the cost by summing the multiplication of the first 3 minutes by 2, multiplication of the remaining minutes by 0.45 and 1.99
Print the the cost
Final answer:
The program calculates the cost of an international call based on the connection fee, the rate for the first three minutes, and the rate for each additional minute, given the total call duration input by the user. It then outputs the total amount due formatted with two decimal places.
Explanation:
The question relates to creating a C++ program that calculates the total cost of an international call from New York to New Delhi. The cost includes a connection fee, a fixed cost for the first three minutes, and a variable cost for each additional minute. The C++ program must prompt the user for the duration of the call in minutes and calculate the total amount due based on the given rates. It should then display the final amount formatted to two decimal places.
Here is an outline of the program that performs this calculation:
#include
#include
using namespace std;
int main() {
const double connectionFee = 1.99;
const double firstThreeMinuteCost = 2.00;
const double additionalMinuteCost = 0.45;
int minutes;
double amountDue;
cout << "Enter the number of minutes the call lasted: ";
cin >> minutes;
if (minutes <= 3) {
amountDue = connectionFee + firstThreeMinuteCost;
} else {
amountDue = connectionFee + firstThreeMinuteCost + (minutes - 3) * additionalMinuteCost;
}
cout << fixed << setprecision(2);
cout << "The total amount due for the call is $" << amountDue << endl;
return 0;
}
The user is prompted for the total minutes of the call. The program calculates the cost considering all the constraints and displays the result with two decimal places using fixed and setprecision manipulators.
How does join work? a. You write separator.join('a', 'b', 'c', 'd', ...) where 'a', 'b', 'c', 'd' can be replaced with other strings, but isn't in a list. b. The separator must be a single character, and you use list.join(separator). c. You use separator.join(a_list) where a_list is a list of strings. d. You write a_list.join(separator) where a_list is a list of strings, and separator is a string.
Answer:
c. You use separator.join(a_list) where a_list is a list of strings.
Explanation:
The join() is an in-built string method which returns a string concatenated with the elements of an iterable. It concatenates each element of an iterable (such as list, string and tuple) to the string and returns the concatenated string.
The syntax of join() is:
string.join(iterable)
From the above syntax, the string usually mean a separator and the iterable will be a string or list or tuple.
The answer is C.
c. You use separator.join(a_list) where a_list is a list of strings.
It is not A because the iterable could be a string. It is not D because the separator is outside not in the bracket.
Which of the following is specified by the detailed procedures in a test plan? Question 12 options: The result of the final test of all programs How a separate operational and test environment is prepared The test data to be used Who will work with the new system and ensure that all necessary features have been included
Final answer:
A test plan typically details 'the test data to be used,' which includes sets of inputs designed to test software functionality and validate outcomes.
Explanation:
The question asks which component is specified by the detailed procedures in a test plan. Of the options provided, the one that is typically detailed in a test plan is the test data to be used. A test plan contains comprehensive information about the testing strategy, test objectives, resources needed for testing, test environment, test limitations, and the schedule of testing activities. Importantly, it specifies the test data which are sets of inputs given to a software program during testing to ascertain an expected outcome and validate the software's functionality.
Hot sites ________. are a.more expensive than CDP b.Lose less data during a disaster than CDP c.Both are more expensive than CDP and Lose less data during a disaster than CDP d.Neither are more expensive than CDP nor Lose less data during a disaster than CDP
Answer:
d. Neither are more expensive than CDP nor Lose less data during a disaster than CDP
Explanation:
A hot site is considered a site that remain very much functional and permits immediate recovery when a disaster occurs. One great advantage of hot sites is that they can be used for operation before the occurrence of a disaster. Hot sites are usually cost effective and hence are less expensive than CDP. With hot sites, users are only faced with minimal downtime in the course of a disaster that affects one of the data centers, hence it is not that they lose less data during a disaster than CDP.
Design an application in which the number of days for each month in the year is stored in an array. (For example, January has 31 days, February has 28, and so on. Assume that the year is not a leap year.) Display 12 sentences in the same format for each month; for example, the sentence displayed for January is Month 1 has 31 days.
Final answer:
To design an application in which the number of days for each month in the year is stored in an array, create an array of integers representing the number of days in each month. Use a loop to display 12 sentences, each containing the month number and the corresponding number of days.
Explanation:
To design an application in which the number of days for each month in the year is stored in an array, you can create an array of integers representing the number of days in each month. Here's an example:
int[] daysInMonth = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
Then, you can use a loop to display 12 sentences, each containing the month number and the corresponding number of days. Here's an example:
for (int i = 0; i < 12; i++) {
System.out.println("Month " + (i + 1) + " has " + daysInMonth[i] + " days.");
}
Final answer:
To design the application, create an array with the number of days corresponding to each month and iterate through the array to display sentences for each month using the provided mnemonic or the knuckle mnemonic to remember the days.
Explanation:
To design an application that stores the number of days for each month in an array, we'll assume a non-leap year. We have the mnemonics "Thirty days hath September, April, June, and November. All the rest have thirty-one, save the second one alone, Which has four and twenty-four, till leap year gives it one day more". So, we'll create an array with the following values: 31 (January), 28 (February), 31 (March), 30 (April), 31 (May), 30 (June), 31 (July), 31 (August), 30 (September), 31 (October), 30 (November), 31 (December). Then, we can iterate through this array and display the sentences accordingly.
For example, the following pseudo-code can be used to display the sentences:Initialize an array daysInMonths = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]For each index in the array representing a month (starting from 0 for January):Print "Month (index + 1) has (value at current index) days"
The knuckle mnemonic is a physical way to remember the number of days in each month, where months with 31 days are represented by the protruding knuckles and shorter months fall in the spots between the knuckles.
Each time an item is added and requires reallocation, count X + 1 units of cost, where X is the number of items currently in the array. This cost will cover the X assignments which are necessary to copy the contents of the full array into a new (larger) array, and the additional assignment to put the item which did not fit originally To make this more concrete, if the array has 8 spaces and is holding 5 items, adding the sixth will cost 1. However, if the array has 8 spaces and is holding 8 items, adding the ninth will cost 9 (8 to move the existing items + 1 to assign the ninth item once space is available).
When we can bound an average cost of an operation in this fashion, but not bound the worst case execution time, we call it amortized constant execution time, or average execution time. Amortized constant execution time is often written as O(1+), the plus sign indicating it is not a guaranteed execution time bound.
In a file called amortizedAnalysis.txt, please provide answers to the following questions:
1. How many cost units are spent in the entire process of performing 16 consecutive push operations on an empty array which starts out at capacity 8, assuming that the array will double in capacity each time new item is added to an already full dynamic array? Now try it for 32 consecutive push operations. As N (ie. the number of pushes) grows large, under this strategy for resizing, what is the big-oh complexity for push?
2. How many cost units are spent in the entire process of performing 16 consecutive push operations on an empty array which starts out at capacity 8, assuming that the array will grow by a constant 2 spaces each time new item is added to an already full dynamic array? Now try it for 32 consecutive push operations. As N (ie. the number of pushes) grows large, under this strategy for resizing, what is the big-oh complexity for push?
Answer:
1. Average of total Cost = Total Cost/n = O(1)
2. Average of total Cost = Total Cost/n = O(n)
Explanation:
1) Array has Initial size of 8
For adding 16 elements
1. So Cost for first 8 element its 8.
2. On adding 9th element cost is (8+1) = 9 and array is resized to size of 16
3. Then for 10th,11th,12th,.......,16th element Cost is 7.
So total cost is 8 +9 + 7 = 24 ..So for adding 16 elements Cost is 24 units.
For adding 32 elements
1. So Cost for first 8 element its 8.
2. On adding 9th element cost is (8+1) = 9 and array is resized to size of 16
3. Then for 10th,11th,12th,.......,16th element total Cost is 7.
4. On adding 17th element cost is (16+1) = 17 and array is resized to size of 32.
5. Then for 18th,19th,20th,.......,32th element total Cost is 15.
So total cost is 8 +9 + 7 +17+15= 56 ..So for adding 32 elements Cost is 56 units.
We are Intrested in finding the Amortized Cost i.e Averga cost over large number of insertion:-
When the array size is doubled:-
N operation of N pushes will have cost of 1+2+4+8+16+.. + 2k where 2k < N, Summing upo the series we have
2k-1 - 2 . But 2k <=n <= 2k-1 So,
The total cost of the sequence of n insertions will be O(n) .
Since the Amortized Cost is the Average of total Cost = Total Cost/n = O(1)
2) resize by increasing the size by 2 elements
For adding 16 elements
1. So Cost for first 8 element its 8.
2. On adding 9th element cost is (8+1) = 9 and array is resized to size of 10
3. Then for 10th element Cost is 1
4. Then for 11th element Cost is 11
5.Then for 12th element Cost is 1
6.Then for 13th element Cost is 13
6.Then for 14th element Cost is 1
6.Then for 15th element Cost is 15
6.Then for 16th element Cost is 1
So total cost is 60 ..So for adding 16 elements Cost is 60 units.
For adding 32 elements
1. So Cost for first 8 element its 8.
2. On adding 9th element cost is (8+1) = 9 and array is resized to size of 10
3. Then for 10th element Cost is 1
4. Then for 11th element Cost is 11
5.Then for 12th element Cost is 1
7.Then for 13th element Cost is 13
8.Then for 14th element Cost is 1
9.Then for 15th element Cost is 15
10.Then for 16th element Cost is 1
11. Then for 17th element Cost is 17
12. Then for 18th element Cost is 1
13.Then for 19th element Cost is 19
14.Then for 20th element Cost is 1
15.Then for 21th element Cost is 21
16.Then for 22th element Cost is 1
17.Then for 23th element Cost is 23 .. . . .. .. Then for 31th element Cost is 31 .. . . . . . . . . .. Then for 32th element Cost is 1 .
So total cost is 260 ..So for adding 32 elements Cost is 260 units.
N operation of N pushes will have cost of 1+2+3+4+5+.. + N-1 = N(N-1)/2
The total cost of the sequence of n insertions will be O(n2) .
Since the Amortized Cost is the Average of total Cost = Total Cost/n = O(n)
Write a code block to decode strings from secret encodings back to readable messages. To do so: Initialize a variable called decoded as an empty string Use a for loop to loop across all characters of a presumed string variable called encoded Inside the loop, convert the character to another character: Get the unicode code point for the character (using ord) Subtract the value of key to that code point (which should be an int) This undoes the secret encoding of the character, getting back to the original value Convert this new int back to a character (using chr). Also inside the loop, add this converted character to the string decoded
Answer:
The answer is provided in the attached document.
Explanation:
The explanation is provided in the attached document.
A company is deploying smartphones for its mobile salesforce. These devices are for personal and business use but are owned by the company. Sales personnel will save new customer data via a custom application developed for the company. This application will integrate with the contact information stored in the smartphones and will populate new customer records onto it. The customer application's data is encrypted at rest, and the application's connection to the back office system is considered secure. The Chief Information Security Officer (CISO) has concerns that customer contact information may be accidentally leaked due to the limited security capabilities of the devices and the planned controls. Which of the following will be the MOST efficient security control to implement to lower this risk?
A. Implement a mobile data loss agent on the devices to prevent any user manipulation with the contact information.
B. Restrict screen capture features on the devices when using the custom application and the contact information.
C. Restrict contact information storage dataflow so it is only shared with the customer application.
D. Require complex passwords for authentication when accessing the contact information.
Answer:
A. Implement a mobile data loss agent on the devices to prevent any user manipulation with the contact information
Explanation:
Given that, the task is to provide Security controls to lower the risk
Hence, one should undertand the various purpose of troubleshooting, which are:
1. Before the security breach, preventive measures are designed to stop or avoid security breach from occurrence.
2. During the security breach, detective actions are designed to establish and characterize a security breach.
3. After the event, corrective actions are purposely designed to stop the level of any damage caused by the security breach.
Hence, in this case, the MOST efficient security control to implement to lower this risk is to implement a mobile data loss agent on the devices to prevent any user manipulation with the contact information
This is because, Mobile Data Loss Prevention (DLP) is a security function that is provided through email or data security solutions. Thus, through its policies application, to the ActiveSync agent, sensitive information can be restricted from being sent to any ActiveSync-enabled mobile device
Write a method called justFirstAndLast that takes a single String name and returns a new String that is only the first and last name.
You may get a name with a middle name or multiple middle names but you should ignore those.
You can assume that there will be at least two names in the given String.
Java
public String justFirstAndLast(String name)
{
}
Answer:
Answer is in the attached screenshot.
Explanation:
Using regex to split a given input string via whitespace, then returns the first and last element of the array.
1) Write expressions of relational algebra for the following queries draw the query trees for each and write the SQL statement: a. What PC models have a speed of at least 3.00 b. What the model numbers of all color printers c. Which manufacturer make laptops with at least 100 GB d. Find the model and price of all products (of any type) made by manufacturer "B" e. Find the manufacturers that sell laptops but not PC.
Answer:
Explanation:
Find attach the solution
The expressions of relational algebra for the given queries and the query trees for each with the SQL statement are explained.
Given are expressions for the given queries in relational algebra, draw the query trees, and provide the corresponding SQL statements:
Let's assume we have the following tables:
PC (model, speed, ram, hd, price)
Printer (model, color, type, price)
Laptop (model, speed, ram, hd, screen, price)
Product (model, type, price)
Manufacturer (name, country)
a. Relational algebra expression: π model (σ speed ≥ 3.00 (PC))
Query tree:
π model
|
σ speed >= 3.00
|
PC
SQL statement:
SELECT model
FROM PC
WHERE speed >= 3.00;
b. Relational algebra expression: π model (σ color = 'color' (Printer))
Query tree:
π model
|
σ color = 'color'
|
Printer
SQL statement:
SELECT model
FROM Printer
WHERE color = 'color';
(Note: Replace 'color' with the actual value representing color printers.)
c. Relational algebra expression: π name (σ hd ≥ 100 (Laptop ⋈ Manufacturer))
Query tree:
π name
|
σ hd >= 100
|
Laptop ⋈ Manufacturer
SQL statement:
SELECT DISTINCT m.name
FROM Laptop l
INNER JOIN Manufacturer m ON l.model = m.model
WHERE l.hd >= 100;
d. Relational algebra expression: π model, price (σ name = 'B' (Product ⋈ Manufacturer))
Query tree:
π model, price
|
σ name = 'B'
|
Product ⋈ Manufacturer
SQL statement:
SELECT p.model, p.price
FROM Product p
INNER JOIN Manufacturer m ON p.model = m.model
WHERE m.name = 'B';
e. Relational algebra expression: π name (Manufacturer) - π name (σ type = 'PC' (Product ⋈ Manufacturer)) ⋈ π name (σ type = 'Laptop' (Product ⋈ Manufacturer))
Query tree:
π name (Manufacturer)
|
-
/ \
/ \
π name π name (σ type = 'Laptop' (Product ⋈ Manufacturer))
|
σ type = 'PC'
|
Product ⋈ Manufacturer
SQL statement:
SELECT DISTINCT m.name
FROM Manufacturer m
WHERE m.name NOT IN (
SELECT DISTINCT m2.name
FROM Product p
INNER JOIN Manufacturer m2 ON p.model = m2.model
WHERE p.type = 'PC'
)
AND m.name IN (
SELECT DISTINCT m3.name
FROM Product p
INNER JOIN Manufacturer m3 ON p.model = m3.model
WHERE p.type = 'Laptop'
);
Please note that the SQL statements assume the actual column names in the tables may vary, and you need to adjust them accordingly.
Learn more about SQL statements click;
https://brainly.com/question/34389274
#SPJ3
Recall that to multiply an m×n matrix by an n×k matrix requires m×n×k multiplications. The Google PageRank algorithm uses a square matrix that’s filled with non-zero entries when pages link to one another. Suppose we have m web sites cataloged: this is then an m×m matrix. Denote this matrix by P. P is then run through an iterative algorithm that takes j loops to complete (for 5 < j < 100), and each step of this loop an m×m matrix is multiplied by P.
a. mj log m
b. m^2
c. m^3
d. m^4
e. m^2j^2
f. m^2log m
Answer:
option C i.e. m^3 is the correct option.
Explanation:
The Multiplication of one m x m matrix with a different m x m matrix will take time m x m x m = m3
And given that this multiplication occurred for j iterations, therefore, the total number of multiplication will be j * m3 = jm3
Consequently, the complexity order will be jm3
Since 5< j < 100, hence j can be substituted by constant and for this reason among all the options mentioned, option C i.e. m^3 is correct.
Suppose a program is running on a distributed-memory multiprocessor. There are 1,000 instructions in the program and 80% of instruction references hit in the local memory and 20% of instruction references involve the remote communication in the remote memory. 10 ns time is required for the remote communication for each instruction reference. If the CPU clock rate is 4 GHZ and CPI is 0.5, what is the running time of this program?
Answer:
2125 ns.
Explanation:
First of all Execution Time = Number of Instructions * CPI * Clock Cycle
Number of Instructions = 1000
CPI = 0.5
Clock Cycle = 1/clock rate = 1/4GHz = 0.25 * 10-9 s
So Execution Time = 1000 * 0.5 * 0.25 * 10-9
Execution Time = 125 * 10-9 s
Execution Time = 125 ns
Now 20% of the instructions take 10 ns extra time for remote communication.
1 instruction takes 10ns
so 20% of 1000 = 200 instructions will take 200*10 = 2000ns
So Total Execution Time = 125+2000 = 2125 ns.
Which of the following is true of e-learning and computer-based training (CBT)?
a. Simulations and games are social media tools that can be used for training.
b. It is not advisable to integrate instruction text with games in e-learning and CBT.
c. Trainees can collaborate with other learners in standalone CBT.
d. E-learning includes the delivery of instruction only through a firm’s intranet, never the Internet.
e. Trainees can answer questions and choose responses in standalone CBT.
Answer:
The answer is "Option c".
Explanation:
This teaching is normally taken at the origin of machines in software-based research. It can also be installing a computer system into their computer or take the electronic training module generally sponsored by the firm's academic Online media, and the wrong option can be described as follows:
In option a, It is wrong because this tool is not used in training. In option b, It is integrated with game and e-learning, that's why it is incorrect. Option d and Options e both were wrong because it can't include delivery and standalone CBT.The true statement regarding e-learning and computer-based training (CBT) is trainees can answer questions and choose responses in standalone CBT.
Option E is the correct answer.
We have,
In standalone CBT, trainees can interact with the training program by answering questions, choosing responses, and engaging in various activities without the need for internet connectivity or external collaboration.
Standalone CBT typically includes interactive elements that allow trainees to actively participate and respond to the training materials.
Thus,
The true statement regarding e-learning and computer-based training (CBT) is trainees can answer questions and choose responses in standalone CBT.
Learn more about e-learning and CPT here:
https://brainly.com/question/30038878
#SPJ6
A binary tree is full if all of its vertices have either zero or two children. Let Bn denote the number of full binary trees with n vertices.
(a) By drawing out all full binary trees with 3, 5, or 7 vertices, determine the exact values of B3, B5, and B7. Why have we left out even numbers of vertices, like B4?
(b) For general n, derive a recurrence relation for Bn.
(c) Show by induction that Bn is (2n). 2.14. You are given an array of n elements, and
Full binary trees have odd vertex count. B3=1, B5=2, B7=5.
Recurrence: Bn = B((n-1)/2)^2 for n>1, B1=1. Bn = (2^(n-1))/n proven by induction.
(a) Determining B3, B5, and B7:
B3 = 1:
There's only one full binary tree with 3 vertices:
*
/ \
* *
B5 = 2:
There are two full binary trees with 5 vertices:
* *
/ \ / \
* * * *
/ \ / \
* * * *
B7 = 5:
There are five full binary trees with 7 vertices:
* * * * *
/ \ / \ / \ / \ / \
* * * * * * * * * *
/ \ / \ / \ / \ / \
* * * * * * * * * *
/ \ / \ / \
* * * * * *
Why even numbers of vertices are left out:
Full binary trees have a unique property: they always have an odd number of vertices. This is because each non-leaf node (a node with children) contributes 2 vertices (itself and its two children), while each leaf node (a node without children) contributes 1 vertex. The root node is always a non-leaf node, and the number of leaf nodes is always one more than the number of non-leaf nodes. Therefore, the total number of vertices is always odd.
(b) Recurrence relation for Bn:
To construct a full binary tree with n vertices (where n is odd), we can start with a root node and attach two full binary subtrees to it. The left subtree will have (n-1)/2 vertices, and the right subtree will also have (n-1)/2 vertices. Since we can choose any valid full binary tree with (n-1)/2 vertices for each subtree, the total number of full binary trees with n vertices is the product of the number of full binary trees with (n-1)/2 vertices on the left and (n-1)/2 vertices on the right.
This leads to the recurrence relation:
Bn = B((n-1)/2) * B((n-1)/2) for n > 1, with B1 = 1
(c) Proof by induction that Bn = (2^(n-1))/n:
Base cases:
B1 = 1 = (2^0)/1, which holds.
B3 = 1 = (2^2)/3, which also holds.
Inductive step:
Assume the formula holds for Bk for all odd k less than or equal to n, where n is odd. We want to prove that it holds for Bn+2 as well.
Using the recurrence relation, we have:
Bn+2 = B((n+2-1)/2) * B((n+2-1)/2) = B((n+1)/2) * B((n+1)/2)
By the induction hypothesis, B((n+1)/2) = (2^((n+1)/2 - 1))/((n+1)/2). Substituting this into the equation above, we get:
Bn+2 = (2^((n+1)/2 - 1))/((n+1)/2) * (2^((n+1)/2 - 1))/((n+1)/2)
Simplifying the exponents and combining fractions, we obtain:
Bn+2 = (2^(n+1 - 2))/((n+1)/2 * (n+1)/2) = (2^(n-1))/(((n+1)^2)/4) = (4 * 2^(n-1))/(n+1)^2 = (2^(n+1))/(n+1)(n+1) = (2^(n+1))/(n+2)
Thus, the formula Bn = (2^(n-1))/n holds for Bn+2 as well, completing the induction
The probable question is in the image attached.
1. Write program, WriteData.java, that writes the following data to file books.txt. Include the semicolons. Fiction;Abraham Lincoln Vampire Hunter;Grahame-Smith;Wiley;NY;13.99;222 Fiction;Frankenstein;Shelley;Prescott;GA;7.99;321 NonFiction;Life of Kennedy;Jones;Pearson;MT;12.90;biography Fiction;Dracula;Stoker;Addison;CA;5.99;145 Fiction;Curse of the Wolfman;Hageman;Wesley;MA;10.59;876 NonFiction;How to Pass Java;Willis;Wiley;NY;1.99;technology Fiction;The Mummy;Rice;Addision;CA;7.99;954 NonFiction;History of Texas;Smith;Prescott;CA;9.75;history 2. Write class Publisher with attributes name and state. 3. Rewrite the Book class to include a type Publisher attribute. 4. Write two children of the Book class: FictionBook and NonFictionBook. FictionBook has an additional attribute, fictionCode. NonFictionBook has an additional attribute, catagoryCode. 5. Rewrite the BookTest program. Method buildInstances will read the data from the file, create instances of FictionBook and NonfictionBook from the data, assign these instances to the Book array and return the bookArray as before. Since it is reading data from the file, it does not have any method parameters. 6. Method createCharges should work the same.
Answer:
Check the explanation
Explanation:
WriteData.java:
import java.io.FileWriter;
import java.io.PrintWriter;
class WriteData {
String[][] data;
public WriteData() {
// Data to write to the file
data = new String[][]{{ "Fiction", "Abraham Lincoln Vampire Hunter", "Grahame-Smith", "Wiley", "NY", "13.99", "222"},
{"Fiction", "Frankenstein", "Shelley", "Prescott", "GA", "7.99", "321"},
{"NonFiction", "Life of Kennedy", "Jones", "Pearson", "MT", "12.90", "biography"},
{"Fiction", "Dracula", "Stoker", "Addison", "CA", "5.99", "145"},
{"Fiction", "Curse of the Wolfman", "Hageman", "Wesley", "MA", "10.59", "876"},
{"NonFiction", "How to Pass Java", "Willis", "Wiley", "NY", "1.99", "technology"},
{"Fiction", "The Mummy", "Rice", "Addision", "CA", "7.99", "954"},
{"NonFiction", "History of Texas", "Smith", "Prescott", "CA", "9.75", "history"}};
}
public void writeToFile() {
try {
PrintWriter pw = new PrintWriter(new FileWriter("books.txt")); // Creating an output stream to write to file
// Writing data to the file line by line
for (int i = 0; i < 8; i++) {
pw.println(data[i][0] + ";" + data[i][1] + ";" + data[i][2] + ";" + data[i][3] + ";" + data[i][4] + ";" + data[i][5] + ";" + data[i][6]);
}
pw.close(); // Closing the created output stream
}
catch(Exception e) {
System.err.println(e);
}
}
}
Publisher.java:
class Publisher {
private String name, state;
public Publisher(String name, String state) {
this.name = name;
this.state = state;
}
// Getters and Setters
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String toString() {
return name + ";" + state;
}
}
Book.java:
class Book {
private String title, author;
private double price;
private Publisher publisher;
public Book(String title, String author, Publisher publisher, double price) {
this.title = title;
this.author = author;
this.publisher = publisher;
this.price = price;
}
public Double calculateCharge(int Qty){
return getPrice()*Qty;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getPublisher() {
return publisher.toString();
}
public void setPublisher(Publisher publisher) {
this.publisher = publisher;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
FictionBook.java:
class FictionBook extends Book {
String fictionCode;
public FictionBook(String title, String author, Publisher publisher, double price, String fictionCode) {
super(title, author, publisher, price); // Calling the parent constructor to initialize values
this.fictionCode = fictionCode;
}
// Getter and Setter
public String getFictionCode() {
return fictionCode;
}
public void setFictionCode(String fictionCode) {
this.fictionCode = fictionCode;
}
}
NonFictionBook.java:
class NonFictionBook extends Book {
String categoryCode;
public NonFictionBook(String title, String author, Publisher publisher, double price, String categoryCode) {
super(title, author, publisher, price); // Calling the parent constructor to initialize values
this.categoryCode = categoryCode;
}
// Getter and Setter
public String getCategoryCode() {
return categoryCode;
}
public void setCategoryCode(String categoryCode) {
this.categoryCode = categoryCode;
}
}
BookTest.java:
import java.util.Scanner;
import java.util.*;
import java.io.File;
import java.io.FileNotFoundException;
public class BookTest {
public static void main(String[] args) {
// TODO code application logic here
// Writing data to the file using WriteData.java program
WriteData writeData = new WriteData();
writeData.writeToFile();
int[] BookQauntity = {12, 8, 3, 53, 7, 23, 14, 5, 6};
Book[] book = new BookTest().buildInstances();
Double GrandTotal= new BookTest().createCharges(BookQauntity, book);
System.out.println("GrandTotal : "+ GrandTotal);
}
catch(FileNotFoundException e) {
System.err.println("File not found");
}
return bk;
};
// ISBN info is removed
Double createCharges(int[] BookQuantity, Book[] book){
Double Gtotal =0.0, total=0.0;
for(int i=0; i<8; i++){
total = book[i].calculateCharge(BookQuantity[i]);
System.out.println("Title : "+ book[i].getTitle() + ", Total Charge : "+ total);
Gtotal +=total;
}
return Gtotal;
};
}
Create a class named BaseballGame that contains data fields for two team names and scores for each team in each of nine innings. names should be an array of two strings and scores should be a two-dimensional array of type int; the first dimension indexes the team (0 or 1) and the second dimension indexes the inning. Create get and set methods for each field. The get and set methods for the scores should require a parameter that indicates which inning’s score is being assigned or retrieved. Do not allow an inning score to be set if all the previous innings have not already been set. If a user attempts to set an inning that is not yet available, issue an error message. Also include a method named display in DemoBaseballGame.java that determines the winner of the game after scores for the last inning have been entered. (For this exercise, assume that a game might end in a tie.) Create two subclasses from BaseballGame: HighSchoolBaseballGame and LittleLeagueBaseballGame. High school baseball games have seven innings, and Little League games have six innings. Ensure that scores for later innings cannot be accessed for objects of these subtypes.
Answer:
Check the explanation
Explanation:
BaseballGame:
public class BaseballGame {
protected String[] names = new String[2];
protected int[][] scores;
protected int innings;
public BaseballGame() {
innings = 9;
scores = new int[2][9];
for(int i = 0; i < 9; i++)
scores[1][i] = scores[0][i] = -1;
}
public String getName(int team) {
return names[team];
}
public void setNames(int team, String name) {
names[team] = name;
}
public int getScore(int team, int inning) throws Exception {
if(team < 0 || team >= 2)
throw new Exception("Team is ut of bounds.");
if(inning < 0 || inning >= innings)
throw new Exception("Inning is ut of bounds.");
return scores[team][inning];
}
public void setScores(int team, int inning, int score) throws Exception {
if(team < 0 || team >= 2)
throw new Exception("Team is ut of bounds.");
if(inning < 0 || inning >= innings)
throw new Exception("Inning is ut of bounds.");
if(score < 0)
throw new Exception("Score is ut of bounds.");
for(int i = 0; i < inning; i++)
if(scores[team][i] == -1)
throw new Exception("Previous scores are not set.");
scores[team][inning] = score;
}
}
HighSchoolBaseballGame:
public class HighSchoolBaseballGame extends BaseballGame {
public HighSchoolBaseballGame() {
innings = 7;
scores = new int[2][7];
for(int i = 0; i < 7; i++)
scores[1][i] = scores[0][i] = -1;
}
}
LittleLeagueBaseballGame:
public class LittleLeagueBaseballGame extends BaseballGame {
public LittleLeagueBaseballGame() {
innings = 6;
scores = new int[2][6];
for(int i = 0; i < 6; i++)
scores[1][i] = scores[0][i] = -1;
}
}
Functional side effects: 15) Given the following Java/C++ like code. Assuming function calls (operands) are evaluated from left-to-right, one at a time. a) What outputs are printed to the screen? int a = 4; // global variable int fun1() { a = 2; return 3; } int fun2() { return a; } void main() { int x = fun1() + fun2(); System.out.println("x = " + x); } Answer: x = b) What outputs are printed to the screen? int a = 4; // global variable int fun1() { a = 2; return 3; } int fun2() { return a; } void main() { int x = fun2() + fun1(); System.out.println("x = " + x); } Answer: x =
Answer:
a. x = 5
b. x = 7
Explanation:
a)
OUTPUT: x = 5
In the main() function, fun1() is evaluated first and it updates the value of the global variable to 2 and returns 3.
The second function returns the value of the global variable 'a' and this variable has value 2.
So,
x = 3 + 2
x = 5
b)
OUTPUT: x = 7
In the main() function, fun2() is evaluated first and it returns 4 because global variable 'a' is initialized with value 4.
The second function fun()1 will returns the value 3.
So,
x = 4 + 3
x = 7
A custom window shade designer charges a base fee of $50 per shade. In addition, charges are added for certain styles, sizes, and colors as follows.
Styles:
Regular shades:Add $0
Folding shades: Add $10
Roman shades: Add $15
Sizes:
25 inches wide: Add $0
27 inches wide: Add $2
32 inches wide: Add $4
40 inches wide: Add $6
Colors:
Natural: Add $5
Blue: Add $0
Teal: Add $0
Red: Add $0
Green: Add $0
Create an application that allows the user to select the style, size, color, and number of shades from list boxes or combo boxes. if a combo box is used, set its drop-downstyle property in such a way the the new items cannot be added to the customer list by the user total charges should be displayed on a second form.
Answer:
Check the explanation
Explanation:
* Filename: ShadeDesigner.java
* Programmer: Jamin A. Bishop
* Date: 3/31/2012
* version 1.00 2012/4/2
*/
import java. awt.*;
import java. awt. event.*;
import java. text. DecimalFormat;
import javax. swing.*;
import javax. swing. event. ListSelectionEvent;
import javax. swing. event. ListSelectionListener;
public class ShadeDesigner extends JFrame
{
private String[] styles = {"Regular Shades", "Folding Shades", "Roman Shades"};
private String[] size = {"25 Inches Wide", "27 Inches Wide",
"32 Inches Wide", "40 Inches Wide"};
private String[] colors = {"Natural", "Blue", "Teal",
"Red", "Green"};
private JLabel banner;// To display a banner
private JPanel bannerPanel;// To hold the banner
private JPanel stylesPanel;//
private JPanel sizePanel;//
private JPanel colorPanel;
private JPanel buttonPanel;//
private JList stylesList;
private JList sizeList;
private JList colorList;
private JTextField Styles;
private JTextField Size;
private JTextField Color;
private JButton calcButton;
private JButton ExitButton;
private double totalCharges = 50.00;
//Constants
private final int ROWS = 5;
private final double regularCost = 0.00;//base price for the blinds
private final double foldingCost = 10.00;//extra cost for folding blinds
private final double romanCost = 15.00;//extra cost for roman blinds
private final double twentyfiveInCost = 0.00; //extra cost for 25" blinds
private final double twentySevenInCost = 2.00;//extra cost for 27" blinds
private final double thirtyTwoInCost = 4.00;//extra cost for 32" blinds
private final double fourtyInCost = 6.00;//extra cost for 40" blinds
private final double naturalColorCost = 5.00;//extra cost for color
public ShadeDesigner()
{
//display a title
setTitle("Shade Designer");
// Specify what happens when the close button is clicked.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create the banner on a panel and add it to the North region.
buildBannerPanel();
add(bannerPanel, BorderLayout. NORTH);
stylesPanel();
add(stylesPanel, BorderLayout. WEST);
sizePanel();
add(sizePanel, BorderLayout. CENTER);
colorPanel();
add(colorPanel, BorderLayout. EAST);
buttonPanel();
add(buttonPanel, BorderLayout. SOUTH);
pack();
setVisible(true);
}
//build the bannerpanel
private void buildBannerPanel()
{
bannerPanel = new JPanel();
bannerPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
banner = new JLabel("Shade Designer");
banner.setFont(new Font("SanSerif", Font.BOLD, 24));
bannerPanel.add(banner);
}
//stylepanel
private void stylesPanel()
{
JLabel styleTitle = new JLabel("Select a Style.");
stylesPanel = new JPanel();
stylesPanel. setBorder(BorderFactory. createEmptyBorder(5,5,5,5));
stylesList = new JList (styles);
stylesList.setVisibleRowCount(ROWS);
JScrollPane stylesScrollPane = new JScrollPane(stylesList);
stylesList. setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
stylesList. addListSelectionListener(new stylesListListener());
stylesPanel. setLayout(new BorderLayout());
stylesPanel. add(styleTitle, BorderLayout. NORTH);
stylesPanel. add(stylesScrollPane, BorderLayout. CENTER);
Styles = new JTextField (5);
Styles. setEditable(false);
//stylesPanel. add(StylesLabel, BorderLayout. CENTER);
stylesPanel. add(Styles, BorderLayout. SOUTH);
}
private class stylesListListener implements ListSelectionListener
{
public void valueChanged (ListSelectionEvent e)
{
String selection = (String) stylesList. getSelectedValue();
Styles. setText(selection);
}
}
//size panel
private void sizePanel()
{
JLabel sizeTitle = new JLabel("Select a Size.");
sizePanel = new JPanel();
sizePanel. setBorder(BorderFactory. createEmptyBorder(5,5,5,5));
sizeList = new JList (size);
sizeList.setVisibleRowCount(ROWS);
JScrollPane stylesScrollPane = new JScrollPane(sizeList);
sizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
sizeList.addListSelectionListener(new sizeListListener());
sizePanel. setLayout(new BorderLayout());
sizePanel. add(sizeTitle, BorderLayout. NORTH);
sizePanel. add(stylesScrollPane, BorderLayout. CENTER);
//sizeLabel = new JLabel("Style Selected: ");
Size = new JTextField (5);
Size.setEditable(false);
//stylesPanel. add(StylesLabel, BorderLayout. CENTER);
sizePanel. add(Size, BorderLayout. SOUTH);
}
private class sizeListListener implements ListSelectionListener
{
public void valueChanged (ListSelectionEvent e)
{
String selection = (String) sizeList. getSelectedValue();
Size. setText(selection);
}
}
Write a query to display the invoice number, line numbers, product SKUs, product descriptions, and brand ID for sales of sealer and top coat products of the same brand on the same invoice. Sort the results by invoice number in ascending order, first line number in ascending order, and then by second line number in descending order
Final answer:
To display the invoice number, line numbers, product SKUs, product descriptions, and brand ID for sales of sealer and top coat products of the same brand on the same invoice, you can use a SQL query with multiple joins and sorting conditions.
Explanation:
To display the invoice number, line numbers, product SKUs, product descriptions, and brand ID for sales of sealer and top coat products of the same brand on the same invoice, you can use SQL query with multiple joins and sorting conditions. Here's an example:
SELECT i.invoice_number, l1.line_number, l1.product_sku, l1.product_description, l1.brand_idThis query assumes that the tables for invoices are named 'invoices' and the tables for lines are named 'lines'. Modify the table names and column names according to your database schema.
Final answer:
The SQL query should select invoice numbers, line numbers, product SKUs, product descriptions, and brand IDs where product descriptions are 'sealer' or 'top coat' and group by invoice number and brand, ensuring there are at least two such products on the same invoice. The query should sort results as specified.
Explanation:
Writing a SQL query involves selecting specific columns from a table and applying the conditions that match the data retrieval requirements. For this scenario, we want to display invoice numbers, line numbers, product SKUs, product descriptions, and brand IDs for sales of 'sealer' and 'top coat' products of the same brand on the same invoice. Additionally, we are asked to ensure the results are sorted by invoice number in ascending order, first line number in ascending order, and then by second line number in descending order.
Here is an example of what the SQL query might look like:
SELECT InvoiceNumber, LineNumber1, LineNumber2, SKU, ProductDescription, BrandID FROM Sales WHERE (ProductDescription = 'sealer' OR ProductDescription = 'top coat') AND BrandID IS NOT NULL GROUP BY InvoiceNumber, BrandID HAVING COUNT(*) > 1 ORDER BY InvoiceNumber ASC, LineNumber1 ASC, LineNumber2 DESC;
Note that database structure is assumed, and actual table and column names may vary.
Suppose you need to organize a collection of telephone numbers for a company division. There are currently about 6,000 employees, and you know that the phone switch can handle at most 10,000 phone numbers. You expect several hundred lookups against the collection every day. Would you use an array list or a linked list to store the information
Answer:
Using an array list is preferable
Explanation:
A Linked List is an arranged collection of information of the same type in which each element is connected to the next using pointers.
An array list contains set of similar data objects stored in a well arranged memory locations under a common heading or a variable name.
Array elements can be accessed randomly using the array index and can be looked up anytime which makes it correct.Random accessing is not possible in linked list.
Answer:
I would use an array list over a linked list to store the given information from the question.
Explanation:
Let us define what an array list and linked list are
Array list: Array List and Linked List both maintains insertion order and implements List interface. Array List basically uses a dynamic array to keep or store the elements.
Linked list: Linked List internally uses a list that is doubly linked to keep or store the elements
Now,
Using an array list will be of advantage than a linked list as far as look ups are concerned. also we do have some idea about the size of information,
while a Linked list will be useful when we don't know the size of data. also retrieving the information from the array list is much more simpler than linked list as random access is possible with arrays against sequential traversal for lists.
Write a loop to store the letters “f” through “w” in an array named letters. Then, print the contents of the array to the screen.
Answer:
#include<iostream>
#include<conio.h>
using namespace std;
main()
{
char a[18];
int k=102;
for (int j=0; j<18; j++)
{
a[j]=k;
k=k+1;
}
cout<<"The Array of characters between f and W is Given below"<<endl;
for (int l=0;l<18;l++)
{
cout<<a[l]<<endl;
}
getch();
}
Explanation:
In this program, list of characters has been printed between f and w using for loop as per requirement. An array has been taken with name a and size 18, as there are 18 elements from f to w. As we know that ASCII code of Small f is 102 in decimal, we store that in another variable k. Start loop and assign ASCII code of each alphabet using 'k' variable to array a. After that array of assigned alphabets has been printed.
RXOR is described as a 1-bit left-shift rotation performed on the current hash value before each block (in sequence) is being XOR-ed with it. That is, process each successive n-bit block of data: a. Rotate the current hash value to the left by one bit. b. XOR the block into the hash value. Is it true that the following bit flips result in finding a message different than the original and that this new message "produces" the same hash
Answer:
For this given problem as RXOR is a 1 bit left shift rotation performed on a current tash,it is true that this bit flips flips result in finding a message different than the original and that this new message "produces" the same hash.