Can somebody explain me what this code does in a few or one sentence?

#include <iostream>
#include <vector>
using namespace std;

int main () {
   const int NUM_ELEMENTS = 8;
   vector<int> numbers(NUM_ELEMENTS);
   int i = 0;
   int tmpValue = 0;

   cout << "Enter " << NUM_ELEMENTS << " integer values..." << endl;
   for (i = 0; i < NUM_ELEMENTS; ++i) {
       cout << "Enter Value#" << i+1 << ": ";
       cin >> numbers.at(i);
   }
   for (i = 0; i < (NUM_ELEMENTS /2); ++i) {
       tmpValue = numbers.at(i);
       numbers.at(i) = numbers.at(NUM_ELEMENTS - 1 - i);
       numbers.at(NUM_ELEMENTS - 1 - i) = tmpValue;
   }
   system ("pause");
   return 0;
}

Write a C program to take two integer arrays in ascending order and combine them in a new array in descending order. Remove any duplicates in the final array, if any. Your code must store the arrays as a linked list of objects, each put in a “struct.” All operations should also be carried out using linked lists.

Input: 2 sorted arrays, each on a new line.

Output: An array sorted in descending order, without duplicates.

There is a single white space after each number, even after the last number. There is no new line at the end. Use the following struct as a reference:

struct ELEMENT {

int value;

struct ELEMENT *next;

};

=== Sample test case 1 ===

Input:

2 15 18 34 67 87 88

3 8 18 33 67 89 91

Output:

91 89 88 87 67 34 33 18 15 8 3 2

=== Sample test case 2 ===

Input:

28 36 57 59 68 69 420

17 37 57 59 68

Output:

420 69 68 59 57 37 36 28 17

1.Read the Lab6-Background.pdf first.2.Start the “Stack Queue” applet.3.The purpose of this exercise is to see how you could reverse a list of names. Push the three names “Alice,” “Bob,” and “Charles” onto the stack. When you pop the stack 3 times, what do you see in the text field next to “Pop”?4.Write an algorithm in pseudo-codethat would describe how to use a stack to reversea sequence (list)of letters and print them. For instance, if the original sequence is COMPUTERthe output will be RETUPMOC. Review pages 249-250 of the textbook(Chapter8)to see the related sample pseudo-codes.5.A palindrome word is one that has the same sequence of letters if you read it from right to left or left to right(e.g., radar or madam). Describe (in terms of a pseudo-code) how you could use a stack in conjunction with the original listto determine if a sequence is a palindrome.Hint:Given that the letters have been already assigned to both stackand the queueand these two data structures are ready to be processed (compared).

UPDATE: Whole Code

How do I fix this Bold part "!= Null" ? its showing me Error? please Help

#include<iostream>
#include<string>
#include<string.h>
#include<fstream>
#include<stdlib.h>
#include<sstream>

using namespace std;

int main(){

string list[1000];
cout << "! Opening data file... ./Data.CS.SFSU.txt\n";
ifstream fin("Data.CS.SFSU.txt");
if(fin.fail()){
cout << "Error opening file\n";
return 0;
}
cout << "! Loading data...\n";
int count = 0;
while(getline(fin,list[count])!=NULL){
//cout << "--------------------\n";
count++;
}

cout << "! Loading completed...\n";
fin.close();
cout << "! Closing data file... ./Data.CS.SFSU1.txt\n";
cout << "-----DICTIONARY 340 C++-----\n";
while(true){
cout << "Search:";
string line;
getline(cin,line);
cout << "|" << endl;
stringstream ss(line);
  
string word1, word2, word3;
ss >> word1 >> word2;
if (ss >> word3 || (word2 != "noun" && word2 != "adjective" && word2 != "verb")){
cout << "Please enter a search key (and a part of speech)\n";
}
else {
for (int i = 0; i<word1.length(); i++){
word1[i] = tolower(word1[i]);
}
int found = 0;
cout << count << endl;
  
for (int i = 0; i< count; i++){
char line2[200];
strcpy(line2, list[i].c_str());
char *ch = strtok(line2,"|");
//cout << ch << endl;
while (ch != NULL){
//cout << ch << endl;
//cout << ch1 << " " << endl;
if (strcmp(ch,(char *)word1.c_str()) == 0){
ch = strtok(NULL,"|");

char line[100];
strcpy(line, ch);
char *ch1 = strtok(line," ");
//cout << line << endl;
if (strcmp(ch1,word2.c_str()) == 0){
ch1 = strtok(NULL," ");
ch1 = strtok(NULL," ");
string s ="";
while (ch1 != NULL){
s = s + ch1 + " ";
ch1 = strtok(NULL," ");
}
cout << word1 << "[" << word2 << "] :" << s << endl;
found = 1;
break;
}
}
ch = strtok(NULL,"|");
}
if (found == 1)
break;
}
if (found == 0)
cout << "Not found\n";
}
cout << "|" << endl;
  
}
return 0;
}

Could i get a walk trough how to solve these questions. Note that   is where the answer is meant to go.

Question 1

Say, instead of a separate variable (nItems), the number of items currently in the list are stored at index 0 in the array data, the actual values being stored starting at index 1. Complete the constructor that instantiates a list that can hold n values (excluding the item that holds the number of items currently in the list). That is, one should be able to add n values to the list before the need to grow it.

public class PackedArrayList {
public int[] data;

public PackedArrayList(int n) {
data = new int[  ];
data[0] =  ;
}
}

Question 2

Complete the body of method addEnsureCapacity in the following code:
public class MyArrayList {
public int[] data;
public int nItems;
public MyArrayList(int n) {
data = new int[n];
nItems = 0;
}
public void grow() {
//assume it increases capacity by 10
}
public boolean isFull() {
return (nItems == data.length);
}
public void addBasic(int val) {
data[nItems] = val;
nItems++;
}
public void addEnsureCapacity(int val) {
if(  == false) {
 ;
}
else {
 ;
addBasic(val);
}
}
}

Assume a file containing a series of words is named words.txt and exists on the computer’s disk. Write a program that reads the data and counts the number of occurrences of each letter. The program should then displays how many times each letter appears in the sentence.

Review 19 In the discussion of TCP splitting in the sidebar in section 3.7  it was claimed that the response time with TCP splittting is approximately 4 *  RTTFE +RTTBE + processing time. Please Justify this claim                                                                                                                 

Jim Kurose and Keith Ross,”Computer Networking – A Top-Down Approach”, Addison-Wesley, Seventh Edition, 2017. ISBN-13: 978-0-13-359414-0

In Python:

Define a function drawCircle. This function should expect a Turtle object, the coordinates of the circle’s center point, and the circle’s radius as arguments. This function should draw the specified circle. The algorithm should draw the circle’s circumference by turning 3 degree and moving a given distance 120 times. Calculate the distance moved with the formula 2.0*π*radius/120.0.

Write a complete C++ program that prompts the user for the price of the prix fixe menu choice. The program should then prompt the user for the number of guests in the party. The program should then calculate the bill including tax and tip then print the results to the console in the form of a receipt

For C++ Programming (I need it for C++ without using importing from java.)

This is Java programing. Complete Java program to produce the following output.

interface Register{  
void course();  
}  

public class Interface1{  
   public static void main(String args[]){  
     Register c=new A();
     c.course();
     Register s=new B();
     s.course();  
   }
}  

//output

I'm taking A

I'm taking B

In C++ Please

Problem   1:   How   to   calculate   a   home's   value  

Housing economists have long used a home price/rent ratio as one way to gauge whether or not home prices are inflated or undervalued.

A housing P/E

The use of a price/rent ratio is analogous to employing a price/earnings ratio for stocks. When a stock price is high, and its earnings per share relatively low, the P/E is high. A high P/E often indicates that the stock is too expensive, and the share price is headed for a drop.
What someone is willing to pay to rent a place is that home's "earnings." And, just as in the stock market, a high home price related to the rental earnings mean homes values will probably drop.
For a specific look at how a home's P/E is determined, let's consider a home that is listed for either rent or sale in suburban Chicago.
The home has been rented for the past three years for $1,600 per month; so that is $19,200 per year. It is currently listed for sale at $400,000. Dividing the price by the total annual rent of $19,200 gives a "housing P/E" of 20.83. According to Moody's Economy.com, the long-run average housing P/E is 16, so a P/E of 20.83 suggests that this home may be somewhat overpriced.

For this programming project you will read in a list of housing prices and how much each house is rented for that are found in the attached HousingPrices.txt file. The file looks like this:

713047 1246
1605787 1979
1174719 1879
1018239 1700

Where the first value on each line is the price of the home, and the second number on each line is the price that this home currently rents for per month.
Read these numbers in from the file into 2 separate arrays of size 100, since there are 100 home prices/rents in the file. Do this part in your main method.   
Then use a for-loop to loop through the arrays and for each pair of values send them into a method that you will write called "getHousingPE". Your method will have two parameters; the price of the home and the current monthly rental rate of the home. Your method will calculate and then return the homes “housing P/E”.   
Check each homes returned P/E value and if the P/E value is greater than 16 you should write to the output “House # is somewhat overpriced”; where # is the number of the house in the file (1100). If the P/E is greater than 19 then you should write to the output “House # is way overpriced”. If the P/E is less than 12 then you should write to the output "“House # might be a good deal”. And if the P/E is less than 9 then you should write “Buy House #, it is a deal”. If the P/E is between 12-16 then output "House # is average".

Problem   2:   Determining   Left   or   Right    

For   this   programming   project   you   are   to   read   in   a   list   of   street   addresses   and   determine   how   many   of   those   addresses   are   on   the   right   side   of   the   street,   and   how   many   are   on   the   left.   The   street   addresses   file   is   a   text   file   that   looks   like:  
  
6 S 33rd St

6 Greenleaf Ave

618 W Yakima Ave

74 S Westgate St

3273 State St
  

You   can   determine   if   an   address   is   either   on   the   left   or   right   side   of   the   street   by   looking   at   the   number   of   the   address;   all   even   numbers   are   on   the   right   side   of   the   street,   and   all   odd   numbers   are   on   the   left   side   of   the   street.  
  
You   will   read   your   data   into   2   arrays;   an   integer   array   to   hold   the   street   number,   and   a   String   array   to   hold   the   rest   of   the   address.       These   will   be   parallel   arrays,   meaning   the   street   number   and   street   address   of   each   index   are   related   to   each   other.  
  
Remember   to   draw   a   picture   so   that   you   can   visualize   this.  
  
You   will   need   to   write   a   method   that   will   determine   if   each   house   is   on   the   left   or   right   side   of   the   street.  
  
You   will   call   this   method   for   every   street   address,   and   then   keep   a   count   of   how   many   houses   are   on   the   left   and   right   sides   of   the   street.  
  
The   output   should   be   the   street   number   and   address   and   then   whether   the   house   is   on   the   left   or   right   side   of   the   street:  
  
Address Left/Right

6649 N Blue Gum St left

4 B Blue Ridge Blvd right

8 W Cerritos Ave #54 right

639 Main St left

…
  

The   number   of   houses   on   the   left   and   right   sides   of   the   street   should   also   be   output.  

How many + operations occur when the following pseudocode is executed? What is the output? s ← 0, t ← 0 for i ∈ {1, ..., 6} do for j ∈ {1, ..., 6} do for k ∈ {1, ..., 6} do if i + j + k = 9 then t ← t + 1 s ← s + 1 print t / s