Playing with encryption:

Write a program that will read a four-digit integer entered by the user and encrypt it as follows: Replace each digit with the result of adding 7 to the digit and getting the remainder after dividing the new value by 10. Then swap the second digit with the fourth. Finally, print the original number and its encrypted one. Now reverse the process. Read an encrypted integer and decrypt it by reversing the algorithm to obtain the original number. Print out both the encrypted and decrypted integer.

please write the code in C format avoid using (<<count>>)

Assume that you work for a travel agency. Write a C program that performs 7 different tasks described below
for this company. The flights have the following
daily departure and arrival times:

a) Based on the time entered by the customer, the closest departure time is displayed using 12- hour format.

b)the customer is asked if they would like a hotel and for how many days. hotel cost is mentioned above. Calculate the total cost (before taxes) and display it (flight + hotel for n number of days +ride).

c) now there is 2 types of discount:
Discount1: If the total fee is a multiple of 11, then the
customer gets a 6% discount.
Discount2: An additional discount of 7% is given to those customers whose subtotal
after discount1 is a multiple of the sum of digits of the customer’s day of birth.
Three examples are given below for your convenience. See Sample Input / output
for more clarification.
• Ex1: If the day of birth entered is 3, the customer will get an additional 7%
discount if the sub-total of their purchase after discount1 is a multiple of 3.
• Ex 2: If the day of birth entered is 12, the customer will get an additional 7%
discount if their purchase after discount1 is a multiple of 3 (since sum of digits of
day of birth (12) is 3).

c)13% tax is applied to the total cost and the final bill is?

I am having a hard time with these questions regarding JDBC and XML.

1)

Which type of driver provides JDBC access via one or more ODBC drivers?

Group of answer choices

a) Type 1 driver

b) Type 2 driver

c) Type 3 driver

d) Type 4 driver

2)

Which of the following provides the application-to-JDBC Manager connection.

a) JDBC Driver

b) JDBC API

c) JDBC Driver API

d) SQL Server

3)

With the code below, indicate JDBC coding best practices that have been violated (this code does compile and run!):

import java.sql.*;

public class StudentData{
public static void main(String[] args) {
ResultSet rs = null;
Statement stmt = null;
Connection conn = null;
try {
Class.forName("org.postgresql.Driver");
conn = DriverManager.getConnection(args[2], args[0], args[1]);
stmt = conn.createStatement();
rs = stmt.executeQuery("SELECT * FROM Student WHERE rollno='" + args[3] + "'");

while (rs.next()) {
System.out.print(rs.getInt(1) + "\t");
System.out.print(rs.getString(2) + "\t ");
System.out.print(rs.getInt(3) + "\t ");
System.out.println(rs.getDate(4));
}
stmt.close();
stmt = null;
rs.close();
rs = null;
}
catch (Exception exc) {
exc.printStackTrace();
}
}
}

a) The program imports all of the java.sql packages

b) This program does not properly close database resources

c) The program should catch SQLException

d) The program should not string-concatenate a query, but rather use a PreparedStatement.

e) The program retrieves data from a ResultSet by column number instead of by name

f) The program hardcodes the name of the JDBC driver and the SQL query. These should be externalized from the compilable code.

g) Answer 1, 3 and 5 only

h) Answers 1-6 all apply

4)

In JDBC, it is a good practice to use standard SQL statement and avoid using db specific query until necessary.

a) True

b) False

Windows 10: Cortana and Windows Search

1. Why might you or a business might want to remove metadata from a document, or a photo shared on the web?
2. Where must the text you type in a search appear in a word?
3. How would you search for files between 0-16KB?
4. Pick a date about one week ago. In File Explorer’s search box, find all files that were modified before that date. What search command did you use?

Trying to create a Class of Employees that holds every Employee created from a class called Employee in c++

C++ The minimum function.

(a) Write a function that takes two integers and returns the value of the smaller one. In the main() function provide 5 test cases to verify its correctness. (b) Write the function that takes two characters and return the smaller one in the lexicographical order. Write the main() function that tests that functions for 5 different pairs of character type variables. (c) Write a generic function that takes two numeric objects and returns the value of the smaller one according to the less-than operation. Test the function in main() using the integer and character types.

Consider two sets of integers, X = [x1, x2, . . . , xn] and Y = [y1, y2, . . . , yn]. Write two versions of a FindUncommon(X, Y ) algorithm to find the uncommon elements in both sets.
Each of your algorithms should return an array with the uncommon elements, or an empty array if there are no uncommon elements.
You do not have to write the ‘standard’ algorithms – just use them. Therefore, you should be able to write each algorithm in about 10 lines of code. You must include appropriate
comments in your pseudocode.

(a) Write a pre-sorting based algorithm of FindUncommon(X, Y ). Your algorithm should strictly run in O(n log n).

(b) Write a Hashing based algorithm of FindUncommon(X, Y ). Your algorithm should run in O(n).

Topic 2 TRUE OR FALSE Q’s

31.          A natural number is the number 0 or any number obtained by adding 1 to a natural number.

32.          The category of numbers called integers includes negative numbers.

33.          A rational number is any number that can be expressed without a fractional part.

34.          The base of a number system determines the number of digits used in the system.

35.          The digits used in any base are 1 through the base number.

36.          The base of the hexadecimal number system is 15.

37.          A number in any base can be expressed using a positional notation.

38.          The letter C is used to represent the number 11 in hexadecimal.

39.          The number 10 represents the base value in every number system.

40.          Representing a number in base 5 sometimes requires more digits than representing that same number in base 10.

41.          The value of each position in a number system is determined by subtracting the base from the position number.

42.          A byte is made up of eight binary digits.

43.          Two hexadecimal digits can be stored in one byte.

44.          Starting from the right, every group of four binary digits can be read as one hexadecimal digit.

45.          To find the decimal equivalent in a new base you just divide the decimal value by the new base.

Java

Define a class called BlogEntry that could be used to store an entry for a Web log.

The class should have instance variables to store :

- the poster’s username,

- text of the entry,

- and the date of the entry using the Date class

Date class is:

class Date

{

private int day, year;

private String mon;

public Date()

{

mon=" ";

day=0;

year=0;

}

public String toString()

{

return (mon+"/"+day+"/"+year);

}

public set_date(String m, int d, int y)

{

mon=m;

day=d;

year=y;

}

}

Methods:

-Add a constructor that allows the user of the class to set all instance variables.

-Also add a method, DisplayEntry()/toString(), that outputs all of the instance variables,

- method called getSummary that returns the first 10 characters from the text (or the entire text if it is less than 10 characters).

.

.

.

.

.

.

my code so far:

import java.util.Scanner;

public class BlogEntry
{
   private String name;
   private String entry;

   public BlogEntry(String n, String e, String m, int d, int y)
   {
       System.out.println("Poster's name: "+n+"\nEntry Text: "+e);
       System.out.println("Date: "+m+" "+d+", "+y);
   }
   public String getName()
   {
       return name;
   }
   public void setName(String n)
   {
       this.name=n;
   }
   public String getEntry()
   {
       return entry;
   }
   public void setEntry(String e)
   {
       this.entry=e;
   }
   class date
   {
   private int d, y;
   private String m;
   public date(String m,int d, int y)
   {
       m= " ";
       d=0;
       y=0;
   }
   public void setdate(String m, int d, int y)
   {
       m=m;
       d=d;
       y=y;
   }
   }
private void String setSummary()
   {
   String summary=" ";
   int space=0;
   int script=0;
   while(space<=9 && script<entry.length())
   {
       String next=entry.substring(script,script+1);
       if(next.equals(" "))
       {
           if(space<=9)
               space++;
           else
               break;
       }
       summary+=next;
       script++;
   }
   return summary;
   }
   public getSummary()
   {
       return summary;
   }

public static void main(String [] args)
{
String name;
String entry;
String month;
int day;
int year;

Scanner input=new Scanner(System.in);

System.out.println("Please enter the Poster's name: ");
name=input.nextLine();

System.out.println("What is the text for the blog entry: ");
entry=input.nextLine();

System.out.println("What is the date of the entry?");
System.out.println("Please enter the month: ");
month=input.nextLine();
System.out.println("Please enter the day: ");
day=input.nextInt();
System.out.println("Please enter the year: ");
year=input.nextInt();

System.out.println("\nBlog Entry:");
BlogEntry entry1= new BlogEntry(name,entry,month,day,year);
BlogEntry entry2= new BlogEntry(name,entry,month,day,year);
entry2.setSummary(entry);
System.out.println("\nThe summary of this entry is "+entry2.getSummary);
  
  
  
  
}

}

.

.

.

.

the error is occuring for my getSummary and setSummary

BlogEntry.java:47: error: '(' expected private void String setSummary() ^

BlogEntry.java:67: error: invalid method declaration; return type required public getSummary() ^

2 errors

Please construct a code following the instructions below

Part 3 – infixEvaluator method

You are required to implement the following method:  

public static double infixEvaluator(String line)

This function first needs to tokenize the input expression (in the form of a String and stored in input variable “line”). You can tokenize the input expression by creating an object of StringSplitter and passing it the String as follows. StringSplitter uses a queue to accomplish the tokenization (see the class for details).

StringSplitter data = new StringSplitter(line);

Next, create your two stacks. Remember one will contain the operators and the other one will include the operands. Define them as follows:

Stack<String> operators = new Stack<String>();  

Stack<Double> operands = new Stack<Double>();

Before we continue further in this method, it will be helpful to consider helper methods we might need (which will make our job easier :-).

Skeleton of the code below:

/**

* give a description of the purpose of this method

* @param line fill in

* @return fill in

*/

public static double infixEvaluator(String line){

return 0.0; // placeholder

}

Problem: Write a program that takes your weight in pounds as input and then prints how much you will weigh on Moon and Mars. The formula to convert weight on the Earth to weight on Moon and Mars are given below:

• Weight on Moon = weight on Earth * 0.165
• Weight on Mars = weight on Earth * 3.711 / 9.81

You should name the program as weight_watcher.py. The output should look like as shown below:

Lab # 4 Multidimensional Arrays

Please write in JAVA.

Programming Exercise 8.5 (Algebra: add two matrices)

Write a method to add two matrices. The header of the method is as follows:

public static double[][] addMatrix(double[][] a, double[][] b

In order to be added, the two matrices must have the same dimensions and the same or compatible types of elements. Let c be the resulting matrix. Each element cij is aij + bij. For example, for two 3 * 3 matrices a and b, c is

Write a test program that prompts the user to enter two 3 * 3 matrices and displays their sum. Here is a sample run

Example run:

Enter matrix1: 1 2 3 4 5 6 7 8 9 (enter)

Enter martix2: 0 2 4 1 4.5 2.2 1.1 4.3 5.2 (enter)

The matrices are added as follows:

1.0 2.0 3.0              0.0 2.0 4.0            1.0 4.0 7.0

4.0 5.0 6.0        +    1.0 4.5 2.2     =      5.0 9.5 8.2

7.0 8.0 9.0              1.1 4.3 5.2           8.1 12.3 14.2

Programming Exercise 8.6 (Algebra: multiply two matrices)

Write a method to multiply two matrices. The header of the method is:

public static double[][] multiplyMatrix(double[][] a, double[][] b)

To multiply matrix a by matrix b, the number of columns in a must be the same as the number of rows in b, and the two matrices must have elements of the same or compatible types. Let c be the result of the multiplication. Assume the column size of matrix a is n. Each element cij is ai1 * b1j + ai2 * b2j + c + ain * bnj. For example, for two 3 * 3 matrices a and b, c is

where cij = ai1 * b1j + ai2 * b2j + ai3 * b3j. Write a test program that prompts the user to enter two 3 * 3 matrices and displays their product. Here is a sample run:

Example run:

Enter matrix1: 1 2 3 4 5 6 7 8 9 (enter)

Enter matrix2: 0 2 4 1 4.5 2.2 1.1 4.3 5.2 (enter)

The multiplication of the matrices is

1 2 3           0 2.0 4.0               5.3 23.9 24

4 5 6     *     1 4.5 2.2     =       11.6 56.3 58.2

7 8 9           1.1 4.3 5.2            17.9 88.7 92.4

discuss the local and global impact of computing on individuals, organizations, and society

Answer the following questions about Starvation.

1. Explain what it means for a job to experience Starvation.
2. How is starvation similar to or different from Deadlock or Livelock?
3. What can an operating system do to prevent a starving job from "remaining in the system forever"?