Unit – Dynamic Animation – Stack Exchange for Game Development

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Blockchain – Missing Transaction – Bitcoin Stack Exchange

The coin has disappeared from the wallet and never arrived in the wallet.

Although we often say (or write) that coins are kept in wallets, it is important to remember that this is just a convenient shorthand for communication between people.

In reality, Bitcoins do not exist in wallets, they are not stored in wallets and are not moved in or between wallets. Bitcoins do not really move between wallets and are not really sent from one wallet or arrive at another. This is all just hand movement and a very casual analogy.

Also, bitcoins are not stored in the blockchain. In the blockchain, only a list (a journal) of transactions with amounts of money using Bitcoin as a unit of measure is kept.

In summary, everything that is in the blockchain really happened. After about six confirmations, the blockchain is unlikely to change its view. If another person's wallet does not match the general and established view of the blockchain, the wallet is incorrect. Maybe because the wallet is out of sync. Theoretically, the receive address may have been entered incorrectly – but this is relatively unlikely.

Let's say you went into a shop and took a $ 20 bill out of your wallet and handed it to the shopkeeper, who put it in his wallet. Then the shopkeeper denies receipt of your $ 20. What do you do then? If you are lucky, there is a witness. The witness can not resolve your dispute, you must take him to court and ask the witness for testimony.

The blockchain is just your witness. The blockchain can provide evidence, but can not resolve disputes.


The transaction is still missing.

If it is in the blockchain, it is not missing.

If it's not in the blockchain, you still have the money.

Your transaction is in the blockchain and has 328 confirmations at the time of writing. 6 confirmations are usually considered safe. It is as safe as it gets. It definitely is not missing. The wait will not make it much more concrete, visible or undeniable. There is no chance it will disappear (on the brink of an unprecedented catastrophe and the possible end of the Bitcoin world)

Magento2: Save CSS – Magento Stack Exchange

We have several shops. How can we save wise CSS apply.
How can we save wise CSS apply. We have all shop has different homepage and all page.

I think to add business code in body class to identify business.

To like:

<body data-container = "body" class = " Account Login Site Layout-1 Column ajax-loading "aria-busy =" true ">

Is it the right method?

Hotels – Booking.com Prepaid – Travel Stack Exchange

I recently booked through Booking.com an apartment in Budapest, which was free.

After reserving the apartment, I received an e-mail from the host of the apartment asking for an upfront payment of 50% of the total cost. The other half must be paid on arrival.

The host asked me to transfer this money.

Is that legitimate? Is that common? It seems a bit strange to me.

Combinatorics – Combinatorial Totals – Mathematics Stack Exchange

Calculation:

$ n choose 0 $+$ n choose $ 4+$ n choose $ 8+ …

The solution to this exercise:

let S1 =$ n choose 0 $$ n choose $ 2+$ n choose4 $$ n choose8 $+ …, S2 =$ n choose1 $$ n choose3 $+$ n choose5 $-…, S3 =$ n choose0 $+$ n choose4 $+$ n choose8 $+ …, S4 =$ n choose2 $+$ n choose6 $+$ n choose10 $+ … and we think (1 + i)$ ^ n $= S1 + iS2 =$ sqrt2 $$ ^ n $(cos$ frac {n pi} {4} $+ isin$ frac {n pi} {4} $) and 2$ ^ {n-1} $+ S1 = 2S3

The problem is that I did not get the part with (1 + i)$ ^ n $I've seen more exercises like these with combinatorial sums, the solution of which was complex numbers, and I'd like someone to explain that method to me. Thank you!

Maps – Android Icon Generator for Photo Stack

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Set Associative Cache Exercise – Computer Science Stack Exchange

I am new to the cache and trying to figure out how to solve this problem. Can someone please provide me some materials to help me solve these kinds of questions? I've tried googling Set Associative Cache, but I have not found many sources on the subject.

Can someone guide me how to solve this question?

2 Set the associative cache

Accept the following contents of a cache in which all blocks are valid. The two-way cache (m = 2) is byte-oriented with a block size of 16 bytes.

Determine the contents of the 8-bit data bus if the processor is reading and the value B70A appears on the 16-bit address bus. If the requested data is not in the cache memory, swipe any previous data in this memory that will be overwritten when new values ​​are saved.

In this case, write the letter on the data bus and set new values ​​for LRU and KEY.
(Note: Numbering of the data columns: 0 … left column, 1 … right column.)

Needed information:

  • Data Content:
  • New value of the LRU:
  • New value of the LRU in raw no:
  • New value of Key:
  • New value of key in column no.:

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Java Database Structure – Code Review Stack Exchange

In order to stay in practice with good Java programming techniques, I have decided to write a database. It stores only employees, allows logged in users to retrieve / hire employees, and has a sign-in mechanism that prevents the use of methods when you are not logged in. I'm looking for feedback in the following areas:

  • structure Is the overall structure of the program good? Are there any improvements that can make the structure of the program more efficient / compact?
  • Login mechanism Is the way I implemented this system alright? Is there a better way to implement this login system?
  • exceptions I have created two custom exceptions for this program. Is the way I coded these exceptions acceptable? Should I have had one? Custom exception Class from which they could inherit so that I can only have the message print error message as parameter / hard coded? I use darkness when writing these exceptions, so that the serialVersionUID is generated automatically.
  • Efficiency / compactness Is there a way to make this program more efficient? Just like that getHighestSalary Method in the Database class.

All suggestions are asked and appreciated. Style and other cleanliness tips are also recommended.

Database.java

Package database;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Database {

private ArrayList employees;
private final string username;
private final string password;
private boolean logged in;

public database () {

this.employees = new ArrayList();
this.username = generateUsername ();
this.password = generatePassword ();
this.loggedIn = false;

populateEmployees ();
}

public void addEmployee (Employee employee) triggers LoginException {
if (logged in) {
this.employees.add (staff);
sortEmployees ();
Return;
}
trigger new LoginException ("Not logged in!");
}

public Employee getHighestSalary () triggers LoginException {
if (logged in) {
Employee highest = this.employees.get (0);
for (Employee Employee: this.employees) {
if (employee.getSalary ()> highest.getSalary ()) {
highest = employee;
}
}
return the highest;
}
trigger new LoginException ("Not logged in!");
}

@SuppressWarnings ("deactivated")
public void sortEmployees () triggers LoginException {
if (logged in) {
Collections.sort ((List) this.employees);
Return;
}
trigger new LoginException ("Not logged in!");
}

public Employee getEmployee (String name) triggers EmployeeNotFoundException, LoginException {
if (logged in) {
for (Employee Employee: this.employees) {
if (employee.getName (). equals (name)) {
Return employee;
}
}
Trigger new EmployeeNotFoundException ("Employee Not Found!");
}
trigger new LoginException ("Not logged in!");
}

// filler for tester class
private void populateEmployees () {
for (int i = 0; i <10; i ++) {
this.employees.add (new employee ("Employee" + i));
}
}

public void login (string username, string password) {
if (this.username.equals (username) && this.password.equals (password)) {
this.loggedIn = true;
}
}

public ArrayList getEmployees () triggers LoginException {
if (logged in) {
Give this back.
}
trigger new LoginException ("Not logged in!");
}

// used for testing
private string generateUsername () {
return "username123";
}

// used for testing
private string generatePassword () {
return "password123";
}

}

Employee.java

Package database;

public class employee {

private final string name;
private int age;
private int salary;


public employee (String name) {
this.name = name;
}

public employee (string name, int age) {
this.name = name;
this.age = age;
}

Public employee (string name, int. Age, int. Salary) {
this.name = name;
this.age = age;
this.salary = salary;
}

public String getName () {return this.name; }
public int getAge () {return this.age; }
public int getSalary () {return this.salary; }

public String toString () {
return "name:" + this.name;
}

}

LoginException.java

Package database;

public class LoginException extends Exception {

private static final long serialVersionUID = 1L;

public LoginException (String message) {
great (message);
}

public void printErrorMessage () {
System.out.println ("LoginException: Not logged in!");
}

}

EmployeeNotFoundException.java

Package database;

public class EmployeeNotFoundException extends Exception {

private static final long serialVersionUID = 1L;

public EmployeeNotFoundException (String message) {
great (message);
}

public void printErrorMessage () {
System.out.println ("EmployeNotFoundException: The employee was not found!");
}

}

Tester.java

Package database;

public class testers {

@SuppressWarnings ("unused")
public static void main (String[] Arguments) {
Database database = new Database ();
database.login ("username1234", "password123");

// Should `LoginException` trigger
To attempt {
for (employee employees: database.getEmployees ()) {
System.out.println (employee);
}
} catch (LoginException e) {
e.printErrorMessage ();
}

// Should `EmployeeNotFoundException` trigger
To attempt {
Employee test = database.getEmployee ("Ben");
} catch (EmployeeNotFoundException e) {
e.printErrorMessage ();
} catch (LoginException e) {
e.printErrorMessage ();
}

}

}