What are the functions of data bases and data ware houses?

In Python, I've created a Node class for implementing a singly linked list.

My Code:

class Node:
def __init__(self,initdata):
self.data = initdata
self.next = None
def getData(self):
return self.data
def getNext(self):
return self.next
def setData(self,newdata):
self.data = newdata
def setNext(self,newnext):
self.next = newnext

class SinglyLinkedList:

def __init__(self):
self.head = None

def add(self,key):
addkey = Node(key)
addkey.setNext(self.head)
self.head = addkey

Now the question is: Create an append method that is O(1) by modifying the constructor of the SinglyLinkedList class by adding another instance variable. You will need to make a modification to the add method as well.

Why should someone study data science? How data science is a great career field?

I need 600 words.

I need original content, so don't copy please.

Discuss whether the spiral model is appropriate for each of the following software projects or not. If not, suggest a better model and provide justifications for your choice.

Project 1: a software team were asked to develop a large-scale human resource software. The project manager identified several major technical risks that need to be mitigated.

Project 2: a software team were asked to develop a small web application for older people to help them apply for health insurance. The team are not sure about how to make it easy for older people to interact with the application.

Q1 / Consider a system consisting of four resources of the same type that are shared by three processes, each of which needs at most two resources. Show that the system is deadlock-free.

Q2 / Sometimes, segmentation and paging are joint into one scheme. Why, explain in your words.

I need convert this java code to C language. There is no string can be used in C. Thank you!

import java.util.Scanner;

public class Nthword
{
public static void main( String args[] )
{
String line;
int word;
Scanner stdin = new Scanner(System.in);

while ( stdin.hasNextLine() )
{
line = stdin.nextLine();
word = stdin.nextInt(); stdin.nextLine(); // get rid of the newline after the int

System.out.println( "Read line: \"" + line + "\", extracting word [" + word + "]" );
System.out.println( "Word #" + word + " is: " + extractWord( line, word ) );
}

stdin.close();

System.out.println( "\nEnd of processing" );
  
}

// returns the first word of the string
private static String extractWord( String theLine, int word )
{
int start;
int end;
int spaces = 1;
String result = "";

// search for the nth non-blank character
for (start = 0; start < theLine.length() && spaces < word; start++)
{
if ( Character.isSpaceChar( theLine.charAt( start ) ) )
{
spaces++;
}
}

// only need to continue if we haven't gone past the end of the string
if ( start<theLine.length() )
{
// the next blank character is the end
for ( end=start ; end<theLine.length() && !Character.isSpaceChar( theLine.charAt( end ) ) ; end++ )
;

// we now have the word
result = theLine.substring( start, end );
}

return( result );
}
  
}

2) Explain the difference between TREE-SEARCH and GRAPH-SEARCH. Support your answer with an example.

The Power of Unified Communications

Chapter 7 highlights the power of the "Network." Advances in networking technology have made the internet possible and have provided the underpinning for a revolution in communications. The Macy's RFID (radio frequency identification) case study at the beginning of the chapter highlights the power of wireless networking in particular. As defined by the text, Unified Communications allows companies to merge disparate modes of communication into a single service. This is akin to the technology that underpins the "triple play" packages offered by cable and telecommunications providers alike which combines video, internet, and phone in one package.

By doing a search of the internet or by other research methods, find an example, or a case study, of an organization that has used Unified Communications to their advantage.

Ponder these questions:

1) What business problem was this organization trying to solve?

2) What was the current state of their communications technology infrastructure?

3) What unified communications technologies did they decide to deploy? What were the key components of this system?

4) How did they improve their business by implementing unified communications?

5) What do you believe the future holds for unified communications?

Create a table of all three of these trigonometric functions for angles from 0 to 2p, with a spacing of 0.1 radian. Your table should contain a column for the angle and then for the sine, cosine, and tangent. ((python))

I am working on a project for my Computer Science course. I am trying to create a Battleship game where a user names two coordinates on a grid and is then told whether this results in a "Hit" or a "Miss". Once the ship has been hit a certain number of times (based on the size of the ship) the ship is sunk. I have written all the code but it now fails to execute when I try to run it. Could someone please help me to get this program working properly? I will paste the code below:

battleship.h:

#ifndef BATTLESHIP_H_
#define BATTLESHIP_H_

// coordinates (location) of the ship and shots
class location {
public:
void locationreset(void); // void constructor, assigns -1 to X
void pick(void); // picks a random location

void fire(void); // asks the user to input the
// coordinates of the next shot
void print(void) const; // prints location in format "a1"

// returns true if the two locations match
friend bool compare(location, location);

private:
static const int fieldSize = 5; // the field (ocean) is fieldSize X fieldSize
int x; // 1 through fieldSize
char y; // 'a' through fieldSize
};

// contains ship's coordinates (location) and whether is was sunk
class ship {
public:
ship(void); // void constructor, sets sunk=false
bool match(location) const; // returns true if this location matches
// the ship's location
bool isSunk(void) const { return(sunk); }; // checks to see if the ship is sunk
void sink(void); // sets "sunk" member variable of the ship to true
void setLocation(location); // deploys the ship at the specified location
void printShip(void) const; // prints location and status of the ship

private:
location loc;
bool sunk;
};

// contains the fleet of the deployed ships
class fleet {
public:
void deployFleet(void); // deploys the ships in random locations
// of the ocean
bool operational(void) const; // returns true if at least
// one ship in the fleet is not sunk
bool isHitNSink(location); // returns true if there was a deployed
// ship at this location (hit) and sinks it
// otherwise returns false (miss)
void printFleet(void) const; // prints out locations of ships in fleet

private:
static const int fleetSize = 5; // number of battleships
bool check(location); // returns true if one of the ship's locations
// matches the ship, returns false
// if none-match
ship ships[fleetSize]; // battleships of the fleet
};

#endif /* BATTLESHIP_H_ */

//////////////////////////////////////////////////////////////////////////////////////////////////////////

battleship.cpp:

#include <iostream>
#include <ctime>
#include <cstdlib>
#include "battleship.h"

using namespace std;

void location::locationreset(void) {
   x = -1;
   y = 'x';
}

void location::pick(void) {
   x = rand() % fieldSize + 1;
   y = rand() % fieldSize;
   switch (y) {
   case 0: y = 'a'; break;
   case 1: y = 'b'; break;
   case 2: y = 'c'; break;
   case 3: y = 'd'; break;
   case 4: y = 'e'; break;
   }
}

void location::fire(void) {
   cout << "input the coordinates of the next shot "; cin >> y >> x;

}
void location::print() const {
   cout << y << x;
}
bool compare(location loc1, location loc2) {
   return (loc1.x == loc2.x && loc1.y == loc2.y);
}

ship::ship(void) {
   sunk = false;
}

bool ship::match(location shiploc) const {
   return compare(loc, shiploc);
}

void ship::sink(void) {
   sunk = true;
}

void ship::setLocation(location shiploc) {   // deploys the ship at the specified location
   loc = shiploc;
}

void ship::printShip(void) const { // prints location and status of the ship
   loc.print();
   if (sunk == true)
       cout << "sunk";
   else if (sunk == false)
       cout << "not sunk" << endl;
}

void fleet::deployFleet(void) { // deploys the ships in random locations of the ocean
   location loc; loc.locationreset();
   for (int i = 0; i < fleetSize; i++) {
       loc.pick();
       ships[i].setLocation(loc);
   }

}

bool fleet::operational() const { // returns true if at least one ship in the fleet is not sunk
   for (int i = 0; i < fleetSize; ++i)
       if (ships[i].isSunk() == false)
           return true;
   return false;

}

bool fleet::isHitNSink(location shiploc) {   // returns true if there was a deployed
   for (int i = 0; i < fleetSize; ++i) {
       if (ships[i].match(shiploc) == true && ships[i].isSunk() == false)
       {
           ships[i].sink();
           return true;
       }
       else
           return false;
   }
}

void fleet::printFleet(void) const { // prints out locations of ships in fleet
   for (int i = 0; i < fleetSize; ++i)
       ships[i].printShip();
}

bool fleet::check(location shiploc) {
   for (int i = 0; i < fleetSize; ++i)
       if (ships[i].match(shiploc))
       {
           return true;
       }
       else
       {
           return false;
       }
}

////////////////////////////////////////////////////////////////////////////

main.cpp:

#include "battleship.h"
#include <iostream>

using namespace std;

int main() {
   srand(time(NULL));
   char answer;
   fleet myFleet;   //computer's ships
   myFleet.deployFleet(); // fleet is deployed at random locations
   cout << "Do ships' positions and status need to be printed? (y for yes)" << endl;
   cin >> answer;
   if (answer == 'y')
       myFleet.printFleet();
   while (myFleet.operational() == true) {
       cout << "there are still ships up";
       location userShot;
       userShot.locationreset();
       cout << "Input location(a-e 1-5): ";
       userShot.fire();
       if (myFleet.isHitNSink(userShot) == true)
           cout << "hit";
       else
           cout << "miss";
       cout << "Do ships' positions and status need to be printed? (y for yes, q to quit)";
       cin >> answer;
       if (answer == 'y')
           myFleet.printFleet();
       else if (answer == 'q')
           break;
   }
}

given an array A = {a₁, a₂, ... , a_n}
find the number of the continuous subarrays of gcd one
continuous subarrays of gcd one means gcd(a_i, a_i+1, ... , a_j) = 1
for example {2, 4, 6, 3} or {1} are continuous subarrays of gcd one

Need this in C++:

Suppose that you are given a set of words; and two words from the set: word 1 and word 2.

Write a program which will transform word 1 into word 2 by changing a single letter in word 1 at a time.

Every transition that word 1 takes will have to be in the set of words.

You must output the smallest sequence of transitions possible to convert word 1 into word 2.

You may assume that all the words in the dictionary are the same length.

The first line will be word 1 and word 2 separated by a comma, followed by the set of words. The set of words will be terminated by a ‘-1’.

Input:

DOG,GOD

DOG

BOG

GOG

ABH

GOD

THU

IOP

-1

Output:

DOG -> GOG -> GOD

Input:

HOUSE,JOUKS

MOUSE

HIUKE

HIUKS

HOUSH

LOUSE

HOZKS

SOUSE

HOUKS

HOUSE

HOUKE

JOUKZ

JOUKS

HOIKE

-1

Output:

HOUSE -> HOUKE -> HOUKS -> JOUKS

In Ruby

A dentist appointment schedule validation software

Implement a superclass Appointment and sub classes OneTime, Day and Month. An appointment has a description (for example, "Root Canal"), and dates information (you can use Date object or int Year, Int Month, Int Day). Fill an array of Appointment objects with a mixture of appointments.

Write a method OccursOn inside each of the sub classes that checks whether the appointment occurs on that date (OneTime), day (Day) or month (Month). Ask the user to enter a date to check (for example, 2006 10 5), and ask to user if they want to check against OneTime, Day or Month appointment. Based on what the user selected, OccursOn inside each of the sub class should run and display any matching appointment and associated descriptions.

Hint: For OneTime subclass, OccursOn need three inputs (Year, Month and Day) to validate, for Day subclass, OccursOn needs one input (Day) to validate, and for Month subclass, OccursOn need one input (Month) to validate. OccursOn is different for different subclasses.