a) To compute the Frame Check Sequence (FCS) field using an Internet Checksum for the four words of data formed from your student ID number (assuming hexadecimal digits), we first convert each hexadecimal digit to its binary representation. b) The possible network topologies for the new wired local area network segment with 25 desktop computers include bus, star, and ring topologies.
Let's assume your student ID number is 170265058. Converting each digit to binary, we have:
1702: 0001 0111 0000 0010
6505: 0110 0101 0000 0101
8026: 1000 0000 0010 0110
5058: 0101 0000 0101 1000
Adding these binary numbers together, we get:
Sum: 1111 1010 0010 1101
Taking the one's complement of the sum, we have the FCS field:
FCS: 0000 0101 1101 0010
Therefore, the complete data stream to be sent from the source adaptor to the destination adaptor, including the FCS field, would be:
1702 6505 8026 5058 0000 0101 1101 0010
b) The possible network topologies for the new wired local area network segment with 25 desktop computers include bus, star, and ring topologies.
For a bus topology, a coaxial or twisted-pair cable can be used, along with Ethernet network interface cards (NICs) for each computer.
For a star topology, each computer is connected to a central hub or switch using twisted-pair cables. Each computer will require an Ethernet NIC, and the central hub/switch will act as a central point for data communication.
For a ring topology, computers are connected in a circular manner using twisted-pair or fiber-optic cables. Each computer will require an Ethernet NIC, and data is passed from one computer to the next until it reaches the destination.
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int[][] array = { {-8, -10}, {1, 0} }; int a = 5, b = 1, c = 0; for(int i = 0; i < array.length; i++) { a++; for(int j = 0; j < array[i].length; j++) { b++; if (i==j) c += array[i][j]; } // output System.out.println("Length System.out.println("Element System.out.println("a = " + a); " + b); + array.length); + array[1][1]); = System.out.println("b = System.out.println("c= + c);
The output displays the length of the array (`2`), the value at `array[1][1]` (`0`), the updated value of `a` (`7`), `b` (`5`), and `c` (`-8`).
The given code snippet calculates the values of variables `a`, `b`, and `c` based on the provided 2D array `array`. Here's the code with corrected syntax and the output:
```java
int[][] array = {{-8, -10}, {1, 0}};
int a = 5, b = 1, c = 0;
for (int i = 0; i < array.length; i++) {
a++;
for (int j = 0; j < array[i].length; j++) {
b++;
if (i == j) {
c += array[i][j];
}
}
}
System.out.println("Length of array = " + array.length);
System.out.println("Element at array[1][1] = " + array[1][1]);
System.out.println("a = " + a);
System.out.println("b = " + b);
System.out.println("c = " + c);
```
Output:
```
Length of array = 2
Element at array[1][1] = 0
a = 7
b = 5
c = -8
```
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1. Label the following as either quantitative or categorical variables:
a. Number of pets in a family
b. County of residence
c. Choice of auto (domestic or import)
d. Distance in miles commuted to work
e. Time spent on social media in the past month
f. Number of Iraq War veterans you know
g. Type of diet (gluten free, vegan, vegetarian, non-restricted)
h. Years of teaching experience
In the given list of variables, we have a mix of quantitative and categorical variables.
Quantitative variables are variables that have numerical values and can be measured or counted. They provide information about quantities or amounts. Examples of quantitative variables in the list include:
a. Number of pets in a family: This variable represents a count of pets and can take on discrete numerical values.
d. Distance in miles commuted to work: This variable represents a continuous numerical measurement of the distance in miles.
Categorical variables, on the other hand, represent characteristics or qualities and cannot be measured on a numerical scale. They provide information about categories or groups. Examples of categorical variables in the list include:
b. County of residence: This variable represents different categories or groups of counties.
c. Choice of auto (domestic or import): This variable represents different categories or groups of automobile choices.
g. Type of diet (gluten free, vegan, vegetarian, non-restricted): This variable represents different categories or groups of dietary choices.
Variables e, f, and h can be considered quantitative depending on how they are measured or categorized.
e. Time spent on social media in the past month: If this variable is measured in minutes or hours, it can be considered quantitative.
f. Number of Iraq War veterans you know: This variable represents a count of individuals and can be considered quantitative.
h. Years of teaching experience: This variable represents a continuous numerical measurement of the years of experience.
It's important to note that the classification of variables as quantitative or categorical depends on the context and how they are measured or defined.
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During class, I presented an example of how to remove the minimum from a priority queue implemented using a min-heap that is represented in an array.
Below is an example of a valid array representation of a priority queue implemented using a min-heap. Show the array content after a single removal of the minimum item. The new array should preserve the "heap-order" property.
7, 15, 10, 28, 16, 30, 42
(To help the auto-grader recognize your answer, it should be comma-separated values without spaces)
The array content after a single removal of the minimum item while preserving the "heap-order" property is: 10, 15, 30, 28, 16, 42.
To remove the minimum item from a min-heap implemented as an array, we follow these steps:
Swap the first element (minimum) with the last element in the array.
Remove the last element from the array.
Perform a "bubble-down" operation to maintain the heap-order property.
Starting with the given array [7, 15, 10, 28, 16, 30, 42]:
Swap 7 with 42: [42, 15, 10, 28, 16, 30, 7].
Remove 7: [42, 15, 10, 28, 16, 30].
Perform a "bubble-down" operation to restore the heap-order property:
Compare 42 with its children (15 and 10). Swap 42 with 10.
Compare 42 with its new children (15 and 28). No swaps needed.
Compare 42 with its new children (16 and 30). No swaps needed.
The final array, preserving the heap-order property, is [10, 15, 30, 28, 16, 42].
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This is a paragraph inside a div element.
This is another paragraph inside a div element.
This is a paragraph, not inside a div element.
This is another paragraph, not inside a div element.
The provided text consists of two paragraphs inside a div element and one paragraph inside a span element, which is itself inside a div element.
The HTML text contains various elements, specifically div and span elements, to structure the paragraphs. The first sentence states that there are two paragraphs inside a div element. This suggests that there is a div element that wraps around these two paragraphs, providing a container or section for them. The second sentence mentions a paragraph inside a span element, which is itself inside a div element. This indicates that there is another div element that contains a span element, and within the span element, there is a paragraph. Essentially, this structure allows for nested elements, where the outermost element is the div, followed by the span element, and finally, the paragraph. Lastly, the last two sentences mention paragraphs that are not inside a div element. These paragraphs exist independently without being wrapped in any additional container elements.
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Multi-way search trees/B-trees/ Red-Black trees: An algorithm for insertion and deletion in a B-tree of order 5 with an example is found in Kruse & Ryba: pages 536- 538. A B-tree is initially NULL. The following characters are inserted into the Null B-tree one by one in sequence. Show diagrams of the B-tree after each character is inserted:
CIHDMFJOL
The B-tree of order 5 ensures that the number of keys in each node is between 2 and 4, and the tree is balanced to maintain efficient search and insertion operations.
To illustrate the insertion process in a B-tree of order 5 with the given characters (CIHDMFJOL), let's follow the steps:
1. Start with an empty B-tree.
2. Insert character 'C':
```
C
```
3. Insert character 'I':
```
C I
```
4. Insert character 'H':
```
C H I
```
5. Insert character 'D':
```
D H C I
```
6. Insert character 'M':
```
D H M C I
```
7. Insert character 'F':
```
F D H M C I
```
8. Insert character 'J':
```
F D H J M C I
```
9. Insert character 'O':
```
F D H J M O C I
```
10. Insert character 'L':
```
F H M
/ | \
D J O
/ \
C I
\
L
```
After inserting all the characters, the B-tree is shown in the diagram above.
The B-tree of order 5 ensures that the number of keys in each node is between 2 and 4, and the tree is balanced to maintain efficient search and insertion operations.
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11. In a country, their currency on coins are 50 cents, 10 cents, 5 cents, I cent. How do you use the Greedy Algorithm of making change to make a change of 83 cents? List all the steps for the points.
To make change for 83 cents using the Greedy Algorithm, you would follow these steps:
Start with the largest coin denomination available, which is 50 cents.
Divide 83 by 50, which equals 1 with a remainder of 33. Take 1 coin of 50 cents and subtract its value from the total.
Total: 83 - 50 = 33 cents
Coins used: 1 x 50 cents
Move to the next largest coin denomination, which is 10 cents.
Divide 33 by 10, which equals 3 with a remainder of 3. Take 3 coins of 10 cents and subtract their value from the total.
Total: 33 - (3 x 10) = 3 cents
Coins used: 1 x 50 cents, 3 x 10 cents
Move to the next largest coin denomination, which is 5 cents.
Divide 3 by 5, which equals 0 with a remainder of 3. Since 3 is less than 5, no coins of 5 cents can be used.
Total: 3 cents
Coins used: 1 x 50 cents, 3 x 10 cents
Move to the next and smallest coin denomination, which is 1 cent.
Divide 3 by 1, which equals 3 with no remainder. Take 3 coins of 1 cent and subtract their value from the total.
Total: 3 - (3 x 1) = 0 cents
Coins used: 1 x 50 cents, 3 x 10 cents, 3 x 1 cent
The total is now 0 cents, indicating that the change of 83 cents has been made successfully.
The final list of coins used to make the change of 83 cents is:
1 x 50 cents, 3 x 10 cents, 3 x 1 cent
Note that the Greedy Algorithm always selects the largest coin denomination possible at each step. However, it may not always result in the minimum number of coins required to make the change. In this case, the Greedy Algorithm provides an optimal solution.
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USING REACT AND JAVASCRIPT AND MONGO DB:
Create a form that people use to send payments. The payment fields will be
• to
• from
• amount
• type
• notes ( allow user to type in a description)
NOTES: When the form is sent, each field is stored in a mongodb collection (DO NOT MAKE THE COLLECTION) so make sure that happens through js. Each variable name is the same as the payment field name. The form can only be submitted if the user is a valid user that has a username in the mongodb directory! Please ask any questions/
Create a payment form using React and JavaScript that stores submitted data in a MongoDB collection, with validation for user existence.
To create the payment form, you will need to use React and JavaScript. The form should include fields for "to," "from," "amount," "type," and "notes," allowing users to enter relevant payment information. Upon submission, the data should be stored in a MongoDB collection.
To ensure the user's validity, you will need to check if their username exists in the MongoDB directory. You can perform this check using JavaScript by querying the MongoDB collection for the provided username.
If the user is valid and exists in the MongoDB directory, the form can be submitted, and the payment data can be stored in the collection using JavaScript code to interact with the MongoDB database.
By following these steps, you can create a payment form that securely stores the submitted data in a MongoDB collection while verifying the existence of the user in the directory to ensure valid submissions.
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The class declaration below declares a Passage class that is for efficient storage of characters (a string). You should implement this calss by following the steps below. class Passage { public: Passage(); // Default constructor Passage (const char *s); // Standard constructor Passage (const Passage &s); // Copy constructor ~Passage(); // Destructor int Length() const; // Returns length of Passage bool Equal (const Passage &s) const; // Compares 2 Passage void Set (const Passage &s); // Sets Passage void Print() const; // Prints Passage private: char *buff; // buffer for holding Passage (i.e., string) }; then you will need to test the following statements: Passage p1; // test default constructor cout<<"p1: "; p1.Print(); Passage p2("Hello"); // test std constructor cout<<"p2: "; p2.print(); Passage p3 (p2); // test copy constructor cout<<"p3: "; p3. Print(); cout<<"p3 length: " << p3. Length() << endl; // test Length() fn : p1.Set(p3); // Test Set() fn if (p2.Equal (p3) cout << "p2 and p3 are same" << endl; // test Equal() fn else cout << "p2 and p3 are different" << endl;
The provided code implements the Passage class with the required constructors, member functions, and data members. The class is used to efficiently store and manipulate character sequences.
Here is the implementation of the Passage class according to the provided class declaration
```cpp
#include <iostream>
#include <cstring>
class Passage {
public:
Passage(); // Default constructor
Passage(const char *s); // Standard constructor
Passage(const Passage &s); // Copy constructor
~Passage(); // Destructor
int Length() const; // Returns length of Passage
bool Equal(const Passage &s) const; // Compares 2 Passage
void Set(const Passage &s); // Sets Passage
void Print() const; // Prints Passage
private:
char *buff; // buffer for holding Passage (i.e., string)
};
Passage::Passage() {
buff = nullptr;
}
Passage::Passage(const char *s) {
int len = strlen(s);
buff = new char[len + 1];
strcpy(buff, s);
}
Passage::Passage(const Passage &s) {
int len = s.Length();
buff = new char[len + 1];
strcpy(buff, s.buff);
}
Passage::~Passage() {
delete[] buff;
}
int Passage::Length() const {
return strlen(buff);
}
bool Passage::Equal(const Passage &s) const {
return (strcmp(buff, s.buff) == 0);
}
void Passage::Set(const Passage &s) {
int len = s.Length();
delete[] buff;
buff = new char[len + 1];
strcpy(buff, s.buff);
}
void Passage::Print() const {
if (buff)
std::cout << buff;
std::cout << std::endl;
}
int main() {
Passage p1; // test default constructor
std::cout << "p1: ";
p1.Print();
Passage p2("Hello"); // test std constructor
std::cout << "p2: ";
p2.Print();
Passage p3(p2); // test copy constructor
std::cout << "p3: ";
p3.Print();
std::cout << "p3 length: " << p3.Length() << std::endl; // test Length() fn
p1.Set(p3); // Test Set() fn
if (p2.Equal(p3))
std::cout << "p2 and p3 are the same" << std::endl; // test Equal() fn
else
std::cout << "p2 and p3 are different" << std::endl;
return 0;
}
```
The Passage class is implemented with a default constructor, standard constructor, copy constructor, destructor, and various member functions. The data member `buff` is a character pointer used to store the character sequence.
The main function demonstrates the usage of the Passage class by creating instances of Passage objects and invoking member functions. It tests the behavior of the constructors, length calculation, equality comparison, setting one Passage object to another, and printing the contents of a Passage object.
Please note that the code provided is in C++. Ensure you have a C++ compiler to run the code successfully.
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Using python
Create a function that takes two arguments for index_group_name and colour_group_name and returns all documents which correspond to the parameters given. Make sure that arguments are case insensitive ("Red"/"red"/"RED" will work)
Create a function that takes three arguments for product_type_name, colour_group_name, and price range (make it as array [...]), and returns the result with product_type_name, colour_group_name, price, department_name, and discount_%. String arguments have to be case insensitive.
Create a function that takes an argument for the product type name, calculates the discount for that product, and returns the product name, old price (before discount), discount, new price (after discount), and product description. Sort by new price from cheap to expensive. Limit to the first 50 results.
Create a function that takes arguments as a string, performs a search in the collection, and retrieves all documents with the specified parameter
The following is a Computer Graphics question:
1. Create a complex object with at least 8 children without
sweeps and extrusions using C++ programming language.
To create a complex object with at least 8 children without using sweeps and extrusions in C++, you can utilize hierarchical modeling techniques. Here's an example of how you can achieve this:
#include <iostream>
#include <vector>
class Object {
private:
std::vector<Object*> children;
public:
void addChild(Object* child) {
children.push_back(child);
}
void render() {
// Render the complex object
std::cout << "Rendering complex object" << std::endl;
// Render the children
for (Object* child : children) {
child->render();
}
}
};
int main() {
Object* complexObject = new Object();
// Create and add at least 8 children to the complex object
for (int i = 0; i < 8; ++i) {
Object* child = new Object();
complexObject->addChild(child);
}
// Render the complex object and its children
complexObject->render();
return 0;
}
In this example, we define a class Object that represents a complex object. It has a vector children to store its child objects. The addChild method is used to add child objects to the complex object. The render method is responsible for rendering the complex object and its children recursively. In the main function, we create a complex object and add at least 8 children to it. Finally, we call the render method to visualize the complex object and its hierarchy.
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Explain the following without using any syntax:
Demonstrate the process of resizing an array
Give the runtime (Big-Theta) analysis
Demonstrate the process of resizing an array by including an explanation of array memory constraints
Incorporate appropriate visual aids to help clarify main points
Resizing an array involves the following process:
When the array is filled to capacity, a new, larger array is created copy of the old array is created and stored in the new array
Array:
All new items are inserted into the new array with the additional capacity that was added runtime (Big-Theta) analysis of the resizing process is O(n), where n is the number of elements in the array. This is because copying the old array to the new array takes O(n) time, and inserting new items takes O(1) time per item. Therefore, the total time complexity is O(n). When an array is resized, there are memory constraints that must be taken into account. Specifically, the new array must have enough contiguous memory to store all of the elements in the old array as well as any new elements that are added. If there is not enough contiguous memory available, the resizing process will fail. Appropriate visual aids, such as diagrams or charts, can be used to help clarify the main points of the resizing process and memory constraints. For example, a diagram showing the old and new arrays side by side can help illustrate the copying process, while a chart showing the amount of memory required for different array sizes can help illustrate the memory constraints.
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Which one of the following commands is required to make sure that the iptables service will never interfere with the operation of firewalld?
systemctl stop iptables
systemctl disable iptables
systemctl mask iptables
systemctl unmask iptables
The correct command to ensure that the iptables service will never interfere with the operation of firewalld is: systemctl mask iptables
This command masks the iptables service, which prevents it from being started or enabled. By masking the iptables service, it ensures that it will not interfere with the operation of firewalld, which is the recommended firewall management tool in recent versions of Linux distributions.
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Suppose you are given an array of pairs, and you have to print all the symmetric pairs. Pair (a, b) and pair (c, d) are called symmetric pairs if a is equal to d and b is equal to c.
Input: The input will be in the following format:
The first line will be ‘n’, indicating the size of the input array, i.e., the number of pairs in the array.
The next ‘n’ lines indicate the ‘n’ pairs.
Each line will be includes two space-separated integers, indicating the first and the second element of the pair.
Output: The output should be in the following format:
Print all the first pairs of the symmetric pairs, each in a new line.
Every line should be two space-separated integers, indicating a symmetric pair.
Note:
If a pair is symmetric, then print the pair that appears first in the array.
If there are no symmetric pairs, then print ‘No Symmetric pair’.
If the array is empty, then consider that there are no symmetric pairs in the array.
Sample input-1:
4
1 2
3 4
2 1
4 3
Sample output-1:
1 2
3 4
Here, in sample input, the first line of input is 'n', which represents the number of pairs that the user will enter. The next line in the input includes two space-separated integers, indicating a symmetric pair. The output contains the first pair of the symmetric pairs, as 1 2 and 2 1 are symmetric pairs, but 1 2 appears first in the input; thus, it will be in output.
Sample input-1:
3
1 2
2 3
3 4
Sample output-1:
No Symmetric pair
Here in the sample input, the first line of input is 'n', which represents the number of pairs that the user will enter. The next line in the input includes two space-separated integers, indicating a symmetric pair. As the input does not have any symmetric pairs, 'No Symmetric pair' is printed.
import java.util.Scanner;
class Source {
public static void main(String arg[]) {
Scanner in = new Scanner(System.in);
//number of pairs in the array
int n = in.nextInt();
int arr[][] = new int[n][2];
// store the input pairs to an array "arr"
for (int i = 0; i < n; i++) {
arr[i][0] = in.nextInt();
arr[i][1] = in.nextInt();
}
// Write your code here
}
}
Here's the complete code that solves the problem:
```java
import java.util.*;
class Source {
public static void main(String arg[]) {
Scanner in = new Scanner(System.in);
// number of pairs in the array
int n = in.nextInt();
int arr[][] = new int[n][2];
// store the input pairs to an array "arr"
for (int i = 0; i < n; i++) {
arr[i][0] = in.nextInt();
arr[i][1] = in.nextInt();
}
// Check for symmetric pairs
boolean foundSymmetricPair = false;
Set<String> symmetricPairs = new HashSet<>();
for (int i = 0; i < n; i++) {
int a = arr[i][0];
int b = arr[i][1];
for (int j = i + 1; j < n; j++) {
int c = arr[j][0];
int d = arr[j][1];
if (a == d && b == c) {
foundSymmetricPair = true;
symmetricPairs.add(a + " " + b);
break;
}
}
}
// Print the output
if (foundSymmetricPair) {
for (String pair : symmetricPairs) {
System.out.println(pair);
}
} else {
System.out.println("No Symmetric pair");
}
}
}
```
You can run this code in a Java compiler or IDE, provide the input as described, and it will output the desired result.
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***** DONT COPY PASTE CHEGG ANSWERS THEY ARE WRONG I WILL
DISLIKE AND REPORT YOU *****
In Perl: Match a line that contains in it at least 3 - 15
characters between quotes (without another quote inside
To match a line that contains at least 3-15 characters between quotes (without another quote inside) in Perl, you can use the following regular expression:
/^\"(?=[^\"]{3,15}$)[^\"\\]*(?:\\.[^\"\\]*)*\"$/
^ matches the start of the line
\" matches the opening quote character
(?=[^\"]{3,15}$) is a positive lookahead assertion that checks if there are 3-15 non-quote characters until the end of the line
[^\"\\]* matches any number of non-quote and non-backslash characters
(?:\\.[^\"\\]*)* matches any escaped character (i.e. a backslash followed by any character) followed by any number of non-quote and non-backslash characters
\" matches the closing quote character
$ matches the end of the line
This regular expression ensures that the line contains at least 3-15 non-quote characters between quotes and doesn't contain any other quote characters inside the quotes.
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Rather than calling the 1m () function, you would like to write your own function to do the least square estimation for the simple linear regression model parameters and ₁. The function takes two input arguments with the first being the dataset name and the second the predictor name, and outputs the fitted linear model with the form: E[consciousness level] = µ + Â₁× Code up this function in R and apply it to the two predictors input and v_pyr separately, and explain the effect that those two variables have on consc_lev. : # ANSWER BLOCK #Least squared estimator function 1sq <-function (dataset, predictor) { # INSERT YOUR ANSWER IN THIS BLOCK # Get the final estimators beta_1 <- beta_0 <- #Return the results: return (paste0 ('E[consc_lev]=', beta_0, '+ beta_1,'*',predictor)) " } print (1sq (train, 'input')) print (1sq(train, 'v_pyr'))
To implement the least square estimation function for the simple linear regression model in R, you can use the following code:
# Least square estimator function
lsq <- function(dataset, predictor) {
# Calculate the mean of the response variable
mu <- mean(dataset$consc_lev)
# Calculate the sum of squares for the predictor
SS_xx <- sum((dataset[[predictor]] - mean(dataset[[predictor]]))^2)
# Calculate the sum of cross-products between the predictor and response variable
SS_xy <- sum((dataset[[predictor]] - mean(dataset[[predictor]])) * (dataset$consc_lev - mu))
# Calculate the estimated slope and intercept
beta_1 <- SS_xy / SS_xx
beta_0 <- mu - beta_1 * mean(dataset[[predictor]])
# Return the results
return(paste0('E[consc_lev] = ', beta_0, ' + ', beta_1, ' * ', predictor))
}
# Apply the function to the 'input' predictor
print(lsq(train, 'input'))
# Apply the function to the 'v_pyr' predictor
print(lsq(train, 'v_pyr'))
This function calculates the least square estimates of the slope (beta_1) and intercept (beta_0) parameters for the simple linear regression model. It takes the dataset and predictor name as input arguments. The dataset should be a data frame with columns for the response variable consc_lev and the predictor variable specified in the predictor argument.
The output of the function will be a string representing the fitted linear model equation, showing the effect of the predictor variable on the consciousness level (consc_lev). The coefficient beta_0 represents the intercept, and beta_1 represents the slope
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1. A diagnostic test has a probability 0.92 of giving a positive result when applied to a person suffering from a certain cancer, and a 0.03 probability of giving a false positive when testing someone without that cancer. Say that 1 person in 15,000 suffers from this cancer. What is the probability that someone will be misclassified by the test? Your answer should be in a form we could easily enter it into a calculator. 2. 35 football players have scored a total of 135 points this season. Show that at least two of them must have scored the same number of points. 3. Evaluate each of the following. A. If 2 is even, then 5=6. B. If 2 is odd, then 5=6. C. If 4 is even, then 10 = 7+3. D. If 4 is odd, then 10= 7+3. In the following, assume that pis true, q is false, and ris true. E. pv av r(you may want to add parentheses!) F. -^p G. p - (qV p)
To find the probability that someone will be misclassified by the test, we need to consider both false positives and false negatives.
Let's assume we have a population of 15,000 people. Out of these, only 1 person has the cancer, and the remaining 14,999 do not have it.
The probability of a positive result given that a person has the cancer is 0.92. So, the number of true positives would be 1 * 0.92 = 0.92.
The probability of a positive result given that a person does not have the cancer (false positive) is 0.03. So, the number of false positives would be 14,999 * 0.03 = 449.97 (approximately).
The total number of positive results would be the sum of true positives and false positives, which is 0.92 + 449.97 = 450.89 (approximately).
Therefore, the probability that someone will be misclassified by the test is the number of false positives divided by the total number of positive results:
Probability of misclassification = false positives / total positives = 449.97 / 450.89
To enter this into a calculator, use the division symbol ("/"):
Probability of misclassification = 449.97 / 450.89 ≈ 0.9978
So, the probability that someone will be misclassified by the test is approximately 0.9978.
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If there exist a chance that a spam will be detected from 9500
mails of which there are no spam in the mail, which fraction of the
mail is likely to show as spam.
If there are no spam emails in a set of 9500 emails, but there is a chance that a spam email may be falsely detected, we can use Bayes' theorem to determine the probability of an email being classified as spam given that it was detected as spam.
Let's denote "S" as the event that an email is spam, and "D" as the event that an email is detected as spam. We want to find P(S|D), the probability that an email is spam given that it was detected as spam.
From Bayes' theorem, we know that:
P(S|D) = P(D|S) * P(S) / P(D)
where P(D|S) is the probability of detecting a spam email as spam (also known as the true positive rate), P(S) is the prior probability of an email being spam, and P(D) is the overall probability of detecting an email as spam (also known as the detection rate).
Since there are no spam emails, P(S) = 0. Therefore, we can simplify the equation to:
P(S|D) = P(D|S) * 0 / P(D)
P(S|D) = 0
This means that if there are no spam emails in a set of 9500 emails and a spam email is detected, the probability of it being a false positive is 100%. Therefore, the fraction of emails likely to show as spam would be 0.
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public class Test CircleWithCustomException { public static void main(String[] args) { try ( new CircleWithCustomException new CircleWithCustomException new CircleWithCustomException (5); (-5); (0); (InvalidRadius Exception ex) { System.out.println (ex); System.out.println("Number of objects created: + CircleWithCustomException.getNumberOfObjects()); } class CircleWithCustomException { private double radius; private int number of objects - 0: public CircleWithCustomException () (1.0); } public CircleWithCustomException (double newRadius) setRadius (newRadius); number of objects++; public double getRadius() { radius; InvalidRadiusException { InvalidRadiusException public void setRadius (double newRadius) if (newRadius >= 0) radius newRadius: public static int getNumberofobjects() { numberofobjects; public double findArea() { Output: InvalidRadiusException ( new InvalidRadiusException (newRadiva); radius radius* 3.14159;
Output ____
Based on the provided code, there are several syntax errors and missing parts. Here's the corrected version of the code:
```java
public class TestCircleWithCustomException {
public static void main(String[] args) {
try {
new CircleWithCustomException(5);
new CircleWithCustomException(-5);
new CircleWithCustomException(0);
} catch (InvalidRadiusException ex) {
System.out.println(ex);
}
System.out.println("Number of objects created: " + CircleWithCustomException.getNumberOfObjects());
}
}
class CircleWithCustomException {
private double radius;
private static int numberOfObjects = 0;
public CircleWithCustomException() {
this(1.0);
}
public CircleWithCustomException(double newRadius) throws InvalidRadiusException {
setRadius(newRadius);
numberOfObjects++;
}
public double getRadius() {
return radius;
}
public void setRadius(double newRadius) throws InvalidRadiusException {
if (newRadius >= 0)
radius = newRadius;
else
throw new InvalidRadiusException(newRadius);
}
public static int getNumberOfObjects() {
return numberOfObjects;
}
public double findArea() {
return radius * 3.14159;
}
}
class InvalidRadiusException extends Exception {
private double radius;
public InvalidRadiusException(double radius) {
super("Invalid radius: " + radius);
this.radius = radius;
}
public double getRadius() {
return radius;
}
}
```
The corrected code handles the custom exception for invalid radius values and tracks the number of CircleWithCustomException objects created.
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2. A graph-theoretic problem. The computer science department plans to schedule the classes Programming (P), Data Science (D), Artificial Intelligence (A), Machine Learning (M), Complexity (C) and Vision (V) in the following semester. Ten students (see below) have indicated the courses that they plan to take. What is the minimum number of time periods per week that are needed to offer these courses so that every two classes having a student in common are taught at different times during a day. Two classes having no student in common can be taught at the same time. For simplicity, you may assume that each course consists of a single 50 min lecture per week. Anden: A, D Everett: M, A, D Irene: M, D, A Brynn: V, A, C Francoise: C, M Jenny: P, D Chase: V, C, A Greg: P, V, A Denise: C, A, M Harper: A, P, D To get full marks, your answer to this question should be clear and detailed. In particular, you are asked to explain which graph-theoretic concept can be used to model the above situation, apply this concept to the situation, and explain how the resulting graph can be exploited to answer the question.
This type of graph is known as a "conflict graph" or "overlap graph" in scheduling problems.
To model the situation, we can create a graph with six vertices representing the courses: P, D, A, M, C, and V. The edges between the vertices indicate that two courses have at least one student in common. Based on the given information, we can construct the following graph:
```
P D A M C V
P - Y Y - - -
D Y - Y Y - -
A Y Y - Y Y Y
M - Y Y - Y -
C - - Y Y - Y
V - - Y - Y -
```
In this graph, the presence of an edge between two vertices indicates that the corresponding courses have students in common. For example, there is an edge between vertices D and A because students Everett, Irene, and Francoise plan to take both Data Science (D) and Artificial Intelligence (A).
To find the minimum number of time periods per week needed to offer these courses, we can exploit the concept of graph coloring. The goal is to assign colors (time periods) to the vertices (courses) in such a way that no two adjacent vertices (courses with students in common) have the same color (are taught at the same time).
The graph-theoretic concept that can be used to model the situation described is a graph where the vertices represent the courses (P, D, A, M, C, V), and the edges represent the students who have indicated they plan to take both courses.
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Q3 Mathematical foundations of cryptography 15 Points Answer the following questions on the mathematical foundations of cryptography. Q3.1 Primality testing 7 Points Alice wants to test if n = 319 is a prime number. Show that n = 319 is a Fermat pseudo-prime in the base a = 144. Enter your answer here 319 is a strong Use the Miller-Rabin test to decide whether n = pseudo-prime in base a = 144. Detail the steps of the algorithm. Compute (319) where is Euler's totient function. Include details of the computation. Enter your answer here Save Answer Q3.2 Finite rings 4 Points Consider the finite ring R = (Z72, +,-) of integers modulo 72. Which of the following statements are true? Choose all that apply. -1 mark for each incorrect answer. The ring R is also a field. The ring R has only the units +1 and -1. The element 7 € R has the multiplicative inverse 31 in R. The ring R has nontrivial zero divisors. The ring R is an integral domain. Every nonzero element in R is a unit. Q3.3 Cyclic groups 4 Points Consider the multiplicative group G = (Z82,-) of integers modulo 82. Which of the following statements are true for this group? Submit Final Exam 21/22 | Gradescope Choose all that apply. -1 mark for each incorrect answer. The group G is a cyclic group. The group G is not a cyclic group because $82$ is not a prime number. The group G has |G| = 81 elements. The group G has |G| = 40 elements. The group G has the generator g = 9. There exists a solution x E G to the equation 9* = 7 mod 82. Save Answer
Q3.1: 319 is a Fermat pseudo-prime in base 144.
Q3.2: Statements 4 and 5 are true; the rest are false.
Q3.3: Statements 2 and 4 are false; the rest are true.
Q3.1 Primality testing:To determine if n = 319 is a Fermat pseudo-prime in base a = 144, we need to perform the Miller-Rabin test.
First, compute φ(n), where φ is Euler's totient function. For n = 319, we have φ(319) = 318.Next, we compute (144^318) mod 319 using repeated squaring to avoid large exponentiation. The calculation involves taking the remainder of 144 raised to the power of 318 divided by 319.If the result is 1, then n = 319 is a Fermat pseudo-prime in base a = 144. Otherwise, it is not.
The computation of (144^318) mod 319 will determine the result. The detailed steps of the algorithm involve performing the repeated squaring calculation and reducing modulo 319 at each step.
Q3.2 Finite rings:For the finite ring R = (Z72, +, -) of integers modulo 72:
- The statement "The ring R is also a field" is false since R is not a field.- The statement "The ring R has only the units +1 and -1" is false because other units exist in R.- The element 7 ∈ R does not have the multiplicative inverse 31 in R, so the statement is false.- The ring R has nontrivial zero divisors, so this statement is true.- The ring R is not an integral domain since it has zero divisors.- Every nonzero element in R is not a unit since there are elements without multiplicative inverses.
Q3.3 Cyclic groups:For the multiplicative group G = (Z82, -) of integers modulo 82:- The group G is not a cyclic group because 82 is not a prime number, so this statement is false.
- The group G has |G| = 81 elements, so this statement is true.- The group G does not have |G| = 40 elements, so this statement is false.- The group G does not have the generator g = 9 since 9 does not generate all elements of G.- There exists a solution x ∈ G to the equation 9 * x ≡ 7 (mod 82), so this statement is true.
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Q1.B. What is the minimum and maximum number of nodes that can exist in an AVL tree of height 5? [2 pts]
Min:_____ Max:__
Q2. A perfect binary tree is a type of binary tree in which every internal node has exactly two child nodes and all the leaf nodes are at the same level. a. Draw a perfect binary tree with height = 4. [4pts]
b. How many leaf nodes are there in a perfect binary tree of height H? [1pt]
In an AVL tree of height 5, the minimum number of nodes is 16, and the maximum number of nodes is 63.
An AVL tree is a self-balancing binary search tree in which the heights of the left and right subtrees of any node differ by at most 1. The minimum number of nodes in an AVL tree of height h can be calculated using the formula 2^(h-1)+1, while the maximum number of nodes can be calculated using the formula 2^h-1.
For a height of 5, the minimum number of nodes in the AVL tree is 2^(5-1)+1 = 16. This is achieved by having a balanced AVL tree with 4 levels of nodes.
The maximum number of nodes in the AVL tree of height 5 is 2^5-1 = 31. However, since AVL trees are balanced and maintain their balance during insertions and deletions, the maximum number of nodes in a fully balanced AVL tree of height 5 can be extended to 2^5 = 32. If we allow one more level of nodes, the maximum number becomes 2^5-1 + 2^4 = 63.
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Question 10 Not yet answered Marked out of 4.00 In a following line of the code "box(pos=vector(0, 0, o), size=(1,2,3),color=color.green)" size values define following: Select one: length=2, height=1, width=3 o О length=0, height=0, width=0 O length=1, height=2, width=3 ОО length=3, height=2, width=1
In the given code line, the "size" parameter is being used to define the dimensions of the box object being created in the scene. The "size" parameter takes a tuple of three values that represent the length, height, and width of the box respectively.
In this case, the values provided for the size parameter are (1,2,3), which means that the length of the box will be 1 unit, the height will be 2 units, and the width will be 3 units. These dimensions are relative to the coordinate system in which the scene is being rendered.
It's worth noting that the order in which the dimensions are specified can vary depending on the software or library being used. In some cases, the order may be height, width, length, or some other permutation. It's important to check the documentation or reference materials for the specific software or library being used to confirm the order of the dimensions.
In summary, the "size" parameter in the given code line defines the dimensions of the box being created in the scene. The values provided for this parameter are (1,2,3), representing the length, height, and width of the box in units relative to the coordinate system of the scene.
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Task 4: Complete the Deck Create a class, Deck, that encapsulates the idea of deck of cards. We will represent the deck by using an array of 52 unique Card objects. The user may do two things to do the deck at any time: shuffle the deck and draw a card from the top of the deck. Requirements FIELDS Deck cards: private Card cards top: private int top Deck(): public Deck() draw(): public Card draw() getTop(): public int getTop() shuffle(): public void shuffle() toString(): public java.lang.String to String() Figure 3. UML Functionality • Default Constructor o Instantiate and initialize cards with 52 Card CONSTRUCTORS METHODS DeckClient.java public class DeckClient { public static void main(String [] args) { System.out.println("-. Creating a new Deck"); Deck d = new Deck(); System.out.println(d); System.out.println("Top of deck: " + d.getTop()); System.out.println(". Shuffling full deck"); d. shuffle(); System.out.println(d); System.out.println("Top of deck: "1 d.getTop()); System.out.println("- Drawing 10 cards"); for (int i = 0; i <10; i++) { Card c= d.draw(); System.out.println(c); } System.out.println(d); System.out.println("Top of deck: + d.getTop()); System.out.println("-- Shuffling partially full deck"); d. shuffle(); d.getTop()); } } System.out.println(d); System.out.println("Top of deck:
The Deck class encapsulates the concept of a deck of cards, allowing the user to shuffle the deck and draw cards from the top. The DeckClient class demonstrates the functionality of the Deck class by creating a deck, shuffling it, drawing cards, and displaying the deck at different stages.
1. The Deck class represents a deck of cards using an array of Card objects. It has a private field, "cards," which is an array of 52 Card objects. The top field represents the index of the top card in the deck. The default constructor initializes the deck by creating 52 unique Card objects.
2. The draw() method retrieves the card at the top index and decrements the top index by one. The getTop() method returns the index of the top card. The shuffle() method shuffles the cards in the deck by swapping each card with a randomly chosen card from the deck. The toString() method converts the deck into a string representation by concatenating the string representations of each card in the deck.
3. In the DeckClient class, a new Deck object is created and displayed using the toString() method. The getTop() method is used to display the index of the top card. The shuffle() method is called to shuffle the deck, and the shuffled deck is displayed. The draw() method is then called 10 times to draw cards from the deck, and each card is displayed. Finally, the deck is displayed again along with the index of the top card. The shuffle() method is called again to partially shuffle the deck, and the resulting deck is displayed along with the index of the top card.
4. Overall, the Deck class provides the necessary functionality to represent and manipulate a deck of cards, while the DeckClient class demonstrates the usage of the Deck class and showcases its functionality.
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4. The context switch is considered as a: a) Waste of time b) Overhead c) Is computed based on burst time d) A&b 5. The pipe allows sending the below variables between parent and child a) integers b) float c) char d) all of the above 6. The Reasons for cooperating processes: a) More security b) Less complexity c) a&b d) Information sharing
4. The context switch is considered as a: b) Overhead 5. The pipe allows sending the below variables between parent and child: d) all of the above (integers, float, char) 6. The Reasons for cooperating processes: c) a&b (More security and Less complexity)
4. The context switch is considered as an overhead because it involves the process of saving the current state of a process, switching to another process, and later restoring the saved state to continue the execution of the original process. This operation requires time and system resources, thus adding overhead to the overall performance of the system.
5. Pipes in operating systems allow for inter-process communication between parent and child processes. They can transmit various types of data, including integers, floats, and characters. Pipes provide a uni-directional flow of data, typically from the parent process to the child process or vice versa, enabling efficient communication and data sharing between the related processes.
6. Co-operating processes can provide more security and less complexity. By allowing processes to share information and resources, they can collaborate to enhance security measures, such as mutual authentication or access control. Cooperation also reduces complexity by dividing complex tasks into smaller, manageable processes that can work together to achieve a common goal, leading to improved efficiency and ease of maintenance in the system.
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**Java Code**
Exercise 13.5 Find and open the file War.java in the repository. The main method contains all the code from the last section of this chapter. Check that you can compile and run this code before proceeding.
The program is incomplete; it does not handle the case when two cards have the same rank. Finish implementing the main method, beginning at the line that says: // it's a tie.
When there’s a tie, draw three cards from each pile and store them in a collection, along with the original two. Then draw one more card from each pile and compare them. Whoever wins the tie takes all ten of these cards.
If one pile does not have at least four cards, the game ends immediately. If a tie ends with a tie, draw three more cards, and so on.
Notice that this program depends on Deck.shuffle, so you might have to do Exercise 13.2 first.
In the given Java program, the main method is incomplete. It needs to handle ties in the card game. The solution involves drawing additional cards and comparing them until there is a clear winner or one pile has fewer than four cards.
To complete the implementation in the `main` method of the `War` program in Java, follow these steps:
1. At the line that says `// it's a tie`, initialize a `List<Card>` variable to store the cards involved in the tie.
2. Draw three cards from each player's pile and add them to the tie list.
3. Draw one more card from each player's pile.
4. Compare the additional cards drawn by both players.
5. If one player's card is higher in rank, they win the tie and take all ten cards (including the initial two cards and the additional cards). Move all the cards from the tie list to the winner's pile.
6. If the additional cards also result in a tie, repeat steps 2-5 until there is a clear winner or one of the piles has fewer than four cards.
7. If one pile has fewer than four cards, end the game immediately.
Note: This implementation assumes the existence of the `Card` class, `Deck` class, and their respective methods (`shuffle`, etc.).
Before proceeding with this exercise, ensure that you can compile and run the existing code and that you have completed Exercise 13.2, which implements the `shuffle` method for the `Deck` class.
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With respect to a SVM, which of the following is true?
1. Training accuracy can be improved by decreasing the value of the penalty parameter.
2. The penalty parameter cannot be varied using sklearn.
3. The penalty parameter has no influence on the accuracy of the model on training data, only on test data.
4. Training accuracy can be improved by increasing the value of the penalty parameter.
5. The default value of the penalty parameter is optimal; we can't improve the model fit on training data by either increasing or decreasing it.
The penalty parameter in a support vector machine (SVM) can be used to control the trade-off between training accuracy and generalization performance. A higher penalty parameter will lead to a more complex model that is more likely to overfit the training data, while a lower penalty parameter will lead to a simpler model that is more likely to underfit the training data.
The penalty parameter is a hyperparameter that is not learned by the SVM algorithm. It must be set by the user. The default value of the penalty parameter is usually sufficient for most datasets, but it may need to be tuned for some datasets.
To choose the best value for the penalty parameter, it is common to use cross-validation. Cross-validation is a technique for evaluating the performance of a machine learning model on data that it has not seen before.
1. False. Decreasing the value of the penalty parameter will lead to a simpler model that is more likely to underfit the training data.
2. False. The penalty parameter can be varied using sklearn by setting the C parameter.
3. False. The penalty parameter has an influence on the accuracy of the model on both training data and test data.
4. True. Increasing the value of the penalty parameter will lead to a more complex model that is more likely to overfit the training data.
5. False. The default value of the penalty parameter is not always optimal. It may need to be tuned for some datasets.
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Consider an array of integers: 2, 4, 5, 9, 11, 13, 14, 16 Draw out how the array would search for the value 16 using the binary search algorithm. Use the state of memory model, that is show a sectioned array body and indexes (deductions apply otherwise).
The binary search algorithm was used to find the value 16 in the given array [2, 4, 5, 9, 11, 13, 14, 16]. The search narrowed down the array by eliminating halves in each step until the target value was found at index 0.
To illustrate the binary search algorithm for finding the value 16 in the given array [2, 4, 5, 9, 11, 13, 14, 16], we will use a memory model to show the state of the array at each step.
Initial State:
Array: [2, 4, 5, 9, 11, 13, 14, 16]
Indices: 0 1 2 3 4 5 6 7
Step 1:
We calculate the middle index as (0 + 7) / 2 = 3. The middle element is 9, which is smaller than 16. Since we are searching for a larger value, we can eliminate the left half of the array.
Updated State:
Array: [9, 11, 13, 14, 16]
Indices: 0 1 2 3 4
Step 2:
We calculate the new middle index as (0 + 4) / 2 = 2. The middle element is 13, which is smaller than 16. Again, we can eliminate the left half of the remaining array.
Updated State:
Array: [14, 16]
Indices: 0 1
Step 3:
We calculate the new middle index as (0 + 1) / 2 = 0. The middle element is 14, which is smaller than 16. We can now eliminate the left half of the remaining array.
Updated State:
Array: [16]
Indices: 0
Step 4:
We calculate the new middle index as (0 + 0) / 2 = 0. The middle element is 16, which is the value we are searching for. We have found the target value.
Final State:
Array: [16]
Indices: 0
In the final state, the target value 16 is found at index 0 in the array. The binary search algorithm efficiently narrowed down the search space by eliminating half of the remaining array in each step until the target value was found.
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Consider that a table called STUDENTS contains all the the students in a university, and that a table called TAKES contains courses taken by students. You want to make sure that no row can be inserted into the TAKES table that has a student id that is not in the STUDENTS table. What kind of constraint would you use? a.Normalization constraint b.Null constraint c.referential integrity constraint d.Domain constraint e.Primary key constraint
The type of constraint that can be used to make sure that no row can be inserted into the TAKES table that has a student ID that is not in the STUDENTS table is a referential integrity constraint.Referential integrity is a database concept that ensures that relationships between tables remain reliable.
A well-formed relationship between two tables, according to this concept, ensures that any record inserted into the foreign key table must match the primary key of the referenced table. Referential integrity is used in database management systems to prevent the formation of orphans, or disconnected records that refer to nothing, or redundant data, which wastes storage space, computing resources, and slows data access. In relational databases, referential integrity is enforced using constraints that are defined between tables in a database.
Constraints are the rules enforced on data columns on a table. These are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the table. Constraints may be column-level or table-level. Column-level constraints apply to a column, whereas table-level constraints apply to the entire table.
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(a) (6 pts) Describe how we could build the deep models that are relatively robust to adversarial attack? Briefly explain why the model trained in such way could boost the robustness.
Building deep models that are relatively robust to adversarial attacks involves techniques such as adversarial training and regularization.
Adversarial attacks are a major concern in deep learning, where malicious inputs are crafted to deceive or mislead models. To enhance robustness, one approach is adversarial training. This involves augmenting the training data with adversarial examples, generated by applying perturbations to the input data. By including these examples in the training process, the model learns to be more resilient to adversarial attacks. Adversarial training encourages the model to generalize better and adapt to various perturbations, making it more robust in the face of potential attacks.
Regularization techniques also play a crucial role in boosting model robustness. Methods like L1 or L2 regularization impose constraints on the model's weights, encouraging it to learn more generalizable features and reducing its sensitivity to minor perturbations. These regularization techniques help prevent overfitting and improve the model's ability to generalize well to unseen inputs, including adversarial examples.
By incorporating adversarial training and regularization techniques, deep models can develop a better understanding of the underlying patterns in the data and become more robust to adversarial attacks. These methods help the model learn to distinguish between meaningful perturbations and adversarial manipulations, leading to improved performance and enhanced security.
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Write a recursive method that takes two integer number start and end. The method int evensquare2 (int start, int end) should return the square of even number from the start number to the end number. Then, write the main method to test the recursive method. For example: If start = 2 and end = 4, the method calculates and returns the value of: 22 * 42 = 20 If start = 1 and end = 2, the method calculates and returns the value of: 22 = 4 Sample I/O: Enter Number start: 2 Enter Number start: 4 Result = 20 Enter Number start: 1 Enter Number start: 2 II Result = 4
This Java program includes a recursive method `evensquare2` that takes two integer parameters `start` and `end`. It calculates and returns the sum of squares of even numbers between `start` and `end` inclusive.
Here's the recursive method `evensquare2` that takes two integer numbers `start` and `end` and returns the sum of squares of even numbers between `start` and `end` inclusive:
```java
public static int evensquare2(int start, int end) {
if (start > end) {
return 0;
} else if (start % 2 != 0) {
return evensquare2(start + 1, end);
} else {
return start * start + evensquare2(start + 2, end);
}
}
The method first checks if `start` is greater than `end`. If so, it returns 0. If `start` is an odd number, it calls itself recursively with `start + 1` as the new `start` value. If `start` is an even number, it calculates the square of `start` and adds it to the result of calling itself recursively with `start + 2` as the new `start` value.
Here's the main method to test the `evensquare2` method:
```java
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter Number start: ");
int start = input.nextInt();
System.out.print("Enter Number end: ");
int end = input.nextInt();
int result = evensquare2(start, end);
System.out.println("Result = " + result);
}
}
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