Develop Reference

Loop of creation via a user input, WPF C#

The system needs a way of taking input from txtBox.
I then need the system to take the number input, 1-10. And repeat the ticket and file creation for that x amount of times.
This code also creates a file on the pc with the Lottery ticket in it.
the files have to be named LottoKupon1, LottoKupon2 and so on, this needs to match user input of course.
this is for creation of file and folder
namespace Lottery
{
internal class FolderCreater
{
static string folderName = #"C:\lotto";
public static string fileName = #"C:\lotto\LottoKupon.txt";
public static void CreateFolder()
{
if (!Directory.Exists(folderName))
{
Directory.CreateDirectory(folderName);
}
else if (!File.Exists(fileName))
{
File.Create(fileName);
}
else { }
}
}
}
This is for creation of Lottry Ticket
namespace Lottery
{
// the system needs a way of taking input
// from txtBox, int user = int.Parse(txtBox.Text.Trim()); which this line does
// i then need the system to take the number input, 1-10.
// and repeat the ticket and file creation for that x amount of times.
public partial class MainWindow : Window
{
public List<long> ListOfAllArrays = new List<long>();
int i = 1;
Random randNum = new Random();
public MainWindow()
{
InitializeComponent();
}
public void Lotto ()
{
StreamWriter sw = new StreamWriter(FolderCreater.fileName);
sw.WriteLine(" " + "Lotto " + DateTime.Now.ToString("dd/MM/yyyy\n"));
sw.WriteLine(" " + "1-uge\n" + " LYN-LOTTO\n");
Random randNum = new Random();
int[][] AllArrays = new int[10][];
for (int i = 0; i < 10; i++)
{
AllArrays[i] = new int[7];
}
int RowNr = 0;
foreach (int[] row in AllArrays)
{
RowNr++;
sw.Write(RowNr + ". ");
for (int j = 0; j < 7; j++)
{
int number = randNum.Next(1, 37);
while (row.Any(n => n == number))
{
number = randNum.Next(1, 37);
}
row[j] = number;
}
Array.Sort(row);
for(int l = 0; l < 7; l++)
{
sw.Write(row[l].ToString("00") + " ");
}
sw.Write("\n");
}
TestIfSame(AllArrays);
if (CheckBox.IsChecked == true)
{
sw.WriteLine("\n****** Joker Tal ******");
int[][] AllJokerRows = new int[2][];
for (int i = 0; i < 2; i++)
{
AllJokerRows[i] = new int[7];
}
foreach (int[] n in AllJokerRows)
{
sw.Write(" ");
for (int i = 0; i < 7; i++)
{
var JokerNumber = randNum.Next(1, 10);
n[i] = JokerNumber;
}
Array.Sort(n);
for (int u = 0; u < 7; u++)
{
sw.Write(n[u] + " ");
}
sw.Write("\n");
}
}
sw.Close();
}
public void TestIfSame(int[][] AllArrays)
{
//List<long> ListOfAllArrays = new List<long>();
for (int i = 0; i < AllArrays.Length; i++)
{
ListOfAllArrays.Add(MakesLongNumber(AllArrays[i]));
}
for (int i = 0; i < AllArrays.Length; i++)
{
long temp = ListOfAllArrays[0];
ListOfAllArrays.Remove(ListOfAllArrays[0]);
if (ListOfAllArrays.Contains(MakesLongNumber(AllArrays[i])))
{
Lotto();
}
else
{
ListOfAllArrays.Add(temp);
}
}
long MakesLongNumber(int[] row)
{
string a = "";
for (int i = 0; i < row.Length; i++)
{
a += row[i].ToString();
}
return Convert.ToInt64(a);
}
}
private void CheckBox_Checked(object sender, RoutedEventArgs e)
{
}
private void cmdOk_Click_1(object sender, RoutedEventArgs e)
{
FolderCreater.CreateFolder();
Lotto();
// add a ListBox.Items.Add(); within this needs to be the command for the Lottery ticket, so i can have it shown on a list box.
}
**This is for a Lottery assignment, its on a lower level of coding, so no answer that is way too complicated, hope you understand. please ask questions if needed.
I tried a dew things with a for loop around the first void which took user input, but i could not make it work.
the code is expected to create files and Lottery ticket depending on users input**

Passing parameters from a List to a method

I'm solving my first training task and I'm at a dead end: I don't know how to pass values from List to the Percentile method. I can't figure it out myself. List gets the values from txt, and then passes them to methods for different calculations, such as calculating the percentile. I can't figure out how to link a sheet to a percentile.
using System;
using System.Collections.Generic;
using System.IO;
namespace Fromtxt
{
public class Program
{
public static void Main(string[] args)
{
var filePath = #"C:\Users\Saint\Desktop\text1.txt";
var numbers = NumbersFromTxt(filePath);
}
static List<int> NumbersFromTxt(string filePath)
{
var streamReader = new StreamReader(filePath);
var results = new List<int>();
string line;
while ((line = streamReader.ReadLine()) != null)
{
var isParsed = int.TryParse(line, out var result);
if (!isParsed)
throw new Exception("no");
results.Add(result);
}
return results;
}
private static void Percentile(List<int> list, decimal [] arr)
{
list = new List<int>() { };
{
int n = arr.Length;
for (int i = 0; i < n; i++)
{
decimal count = 0;
for (int j = 0; j < n; j++)
{
if (list[i] > list[j])
{
count++;
}
}
decimal percent = (count * 90) / (n - 1);
Console.WriteLine("\nPercentile of stocks Apple for June "
+ (i + 1) + " = " + percent.ToString("F2"));
}
}
}
}
}

If you call method NumbersFromTxt() only once in Main(), and want to use it results in other methods and you are not going to create another class for them, most preferable decision would be to create a field with this value. In your code it would be
using System;
using System.Collections.Generic;
using System.IO;
namespace Fromtxt
{
public class Program
{
public static void Main(string[] args)
{
var filePath = #"C:\Users\Saint\Desktop\text1.txt";
NumbersFromTxt(filePath);
Percentile();
}
static List<int> results;
static void NumbersFromTxt(string filePath)
{
var streamReader = new StreamReader(filePath);
results = new List<int>();
string line;
while ((line = streamReader.ReadLine()) != null)
{
var isParsed = int.TryParse(line, out var result);
if (!isParsed)
throw new Exception("no");
results.Add(result);
}
}
private static void Percentile()
{
{
int n = results.count;
for (int i = 0; i < n; i++)
{
decimal count = 0;
for (int j = 0; j < n; j++)
{
if (results[i] > results[j])
{
count++;
}
}
decimal percent = (count * 90) / (n - 1);
Console.WriteLine("\nPercentile of stocks Apple for June "
+ (i + 1) + " = " + percent.ToString("F2"));
}
}
}
}
}

If I get you right, you already have almost everything set: you just need to call your Percentile method after you calculated numbers, passing these numbers just as you did with filePath for NumbersFromTxt: Percentile(numbers, arr). (Don't know what arr is for, actually)
The only issue left is that you reassign your list in Percentile method, which makes your initial list "disappear" (list = new List<int>() { };). Consider removing this line.
And I don't think you need arr parameter, as you use it only to get Length. Try list.Count.

Need to limit every odd or even thread with a semaphore c#

so I'm in a bit confused as to how I'm supposed to do something. I've got 5 threads that are doing a basic task and they are generated with a for loop in main. I've already used a semaphore that limits the amount of threads running at a time as that's a part of the exercise, what I've got left is to make sure that threads that are next to each other (they're numbered 0-4 using the loop) don't run simultaneously. What I've got as an idea is to block every odd or even thread(it doesn't really matter) but I can't figure out how to both let two threads in and at the same time block every odd one. Is there a specific method for that, or maybe if there is another way, like letting three in at first and somehow not letting the second one in but letting the third one. I'll leave what I've got done so far:
edit: For clarification the way it has to be thought about is actually a bit different then what I initially asked about. So if 1 is running both 0 and 2 aren't allowed to run. But if 0 is running both 4 and 1 aren't allowed to run either. I'm pretty sure that it's obvious that if 4 is running 0 and 3 aren't allowed to work etc. .
using System.Threading;
namespace StudentProblem
{
public class StudentProblem
{
static Semaphore stop = new Semaphore(2,2);
static Semaphore gate = new Semaphore(3,3);
public static void Student(Object o)
{
var r = new Random();
var num = (int) o;
while (true)
{
Console.WriteLine(" Student " + num + " start learning.");
Thread.Sleep(r.Next(2000, 3000));
for (int i = 0; i < num; i++)
Console.Write("_");
//gate.WaitOne();
stop.WaitOne();
Console.WriteLine("> Student " + num + " start eating.");
Thread.Sleep(r.Next(2000, 3000));
for (int i = 0; i < num; i++)
Console.Write("_");
Console.WriteLine("< Student " + num + " stop eating");
//gate.Release();
stop.Release();
}
}
}
class Program
{
static void Main(string[] args)
{
var studentThreads = new Thread[5];
for (int i = 0; i < 5; i++)
{
studentThreads[i] = new Thread(StudentProblem.Student);
studentThreads[i].Start(i);
}
}
}
}

In the end I decided to ditch the whole multiple semaphore approach and went with the old and trusty way. I'll add my solution here. It's not that great, but it works.
using System;
using System.Collections.Generic;
using System.Threading;
namespace testing
{
public class StudentProblem
{
public static List<StudentProblem> allProblems = new List<StudentProblem>();
static Semaphore eatingGate = new Semaphore(2, 2);
private object id;
private bool eating = false;
public StudentProblem(object o)
{
id = o;
}
public object Id
{
get
{
return this.id;
}
}
public bool Eating
{
get
{
return this.eating;
}
}
public void DoStuff()
{
var r = new Random();
var num = (int)this.Id;
Console.WriteLine(" Student " + num + " start learning.");
Thread.Sleep(r.Next(2000, 3000));
while (true)
{
for (int i = 0; i < num; i++)
Console.Write("_");
int indexBehind = 0;
int indexFront = 0;
for (int i = 0; i < allProblems.Count; i++)
{
if(num == 0)
{
indexBehind = 4;
}
else
{
indexBehind = num - 1;
}
if(num == 4)
{
indexFront = 0;
}
else
{
indexFront = num + 1;
}
check:
if (allProblems[indexBehind].Eating != true && allProblems[indexFront].Eating != true)
{
if (eatingGate.WaitOne())
{
this.eating = true;
Thread.Sleep(250);//poigrai si s timeout-a
Console.WriteLine("> Student " + num + " start eating.");
Thread.Sleep(r.Next(1000, 2000));
for (int j = 0; j < num; j++)
Console.Write("_");
Console.WriteLine("< Student " + num + " stop eating");
this.eating = false;
eatingGate.Release();
Console.WriteLine(" Student " + num + " start learning.");
Thread.Sleep(r.Next(2000, 3000));
}
else
{
goto check;
}
}
else
{
goto check;
}
}
}
}
}
class Program
{
static void Main(string[] args)
{
var studentThreads = new Thread[5];
for (int i = 0; i < 5; i++)
{
StudentProblem.allProblems.Add(new StudentProblem(i));
studentThreads[i] = new Thread(StudentProblem.allProblems[i].DoStuff);
studentThreads[i].Start();
}
}
}
}

How to build Array of Lists of Structs in C# (with predefined size of the Array)

Trying to build Array of Lists of Structs in C#. And getting a System.NullReferenceException with the best try (error on line test[i].Add(info1);)
The question is not how to avoid System.NullReferenceException at all, but more like how to quickly build Array of Lists with predefined size of array, thus that one is able to use array[i].Add(Struct) in it. If possible without looping all over the array, just to create the lists.
So these are the requirements:
the size of the array should be predefined;
the numbers of the lists per node should be arbitrary, and there should be a possibility that these are added easily;
the structure should contain the struct Info.
This is the code, I have managed so far (copy and paste should work, to replicate the error):
using System.Collections.Generic;
class Startup
{
static void Main()
{
int entry = 1233;
List<Info>[] test = new List<Info>[entry];
for (int i = 0; i < 500 ; i+=3)
{
Info info1 = new Info()
{
capacity = i * 2,
name = i.ToString()
};
test[i].Add(info1);
}
for (int i = 0; i < 1000; i+=5)
{
Info info2 = new Info();
info2.capacity = i * 2;
info2.name = i.ToString() + i.ToString();
test[i].Add(info2);
}
}
struct Info
{
public int capacity;
public string name;
}
}

Each element of a the array are not defined as the object is a List
This is how you should do it :
using System.Collections.Generic;
class Startup
{
static void Main()
{
int entry = 1233;
List<Info>[] test = new List<Info>[entry];
for (int i = 0; i < 500 ; i+=3)
{
Info info1 = new Info()
{
capacity = i * 2,
name = i.ToString()
};
// if null initialise the list
if(test[i] == null) test[i] = new List<Info>();
test[i].Add(info1);
}
for (int i = 0; i < 1000; i+=5)
{
Info info2 = new Info();
info2.capacity = i * 2;
info2.name = i.ToString() + i.ToString();
// if null initialise the list
if(test[i] == null) test[i] = new List<Info>();
test[i].Add(info2);
}
}
struct Info
{
public int capacity;
public string name;
}
}

Try this:
using System.Collections.Generic;
class Startup
{
static void Main()
{
int entry = 1233;
List<Info>[] test = new List<Info>[entry];
for (int i = 0; i < 500 ; i+=3)
{
Info info1 = new Info()
{
capacity = i * 2,
name = i.ToString()
};
test[i] = new List<Info> {info1};
}
for (int i = 0; i < 1000; i += 5)
{
Info info2 = new Info();
info2.capacity = i * 2;
info2.name = i.ToString() + i.ToString();
if (test[i] == null)
{
test[i] = new List<Info> { info2 };
}
else
{
test[i].Add(info2);
}
}
}
struct Info
{
public int capacity;
public string name;
}
}

Try this:
using System.Collections.Generic;
class Startup
{
static void Main()
{
int entry = 1233;
var test = Enumerable.Range(0,entry)
.Select(i=> {
var y = new List<Info>();
if(i%3==0 && i < 500)
{
y.Add(new Info {
capacity = i*2,
name = i.ToString()
});
}
if(i%5==0 && i < 1000)
{
y.Add(new Info {
capacity = i*2,
name = i.ToString() + i.ToString()
});
}
return y;
}).ToArray();
}
struct Info
{
public int capacity;
public string name;
}
}

Replacing all the empty elements in an array with a String value

I have an array which can hold 10 elements:
string[] Ar = new string[10];
But it has only 5 items added to it. I need to insert The string value "NULL" to the rest of the empty slots in the array and thus making the array 'full' with string elements (that, being my objective).
This is what I've attempted as of now:
int entityCount = 5;
if (entityCount < 10)
{
for (int i = entityCount; i < 10; i++)
{
Ar[i] = "NULL";
}
}
And thus, when printed should output the values:
A, B, C, D, E, NULL, NULL, NULL, NULL, NULL
But this does not seem to do the trick, Still prints out ONLY the 5 items and not the 5 new strings.

I am not from C# background but I think this is what you want:
string[] Ar = new string[10];
for (int i = 0; i < 10; i++)
{
if(String.IsNullOrEmpty(Ar[i]))
{
Ar[i]="NULL";
}
}
for (int i = 0; i < 10; i++)
{
Console.WriteLine(Ar[i]);
}
You can read about String.IsNullOrEmpty(Ar[i]) here.

static void Main(string[] args)
{
int arraySize = 10;
string[] Ar = new string[arraySize];
Ar[0] = "A";
Ar[1] = "B";
Ar[2] = "C";
Ar[3] = "D";
for (int i = 0; i < arraySize; i++)
{
if (Ar[i]==null)
{
Ar[i] = "NULL";
}
}
for (int i = 0; i < Ar.Length; i++)
{
Console.Write(Ar[i]+" ");
}
}
}

this works fine.
int entityCount = 5;
string[] Ar = new string[10];
Ar[0] = "A";
Ar[1] = "B";
Ar[2] = "C";
Ar[3] = "D";
Ar[4] = "E";
if(entityCount < 10) {
for(int i = entityCount; i < 10; i++) {
Ar[i] = "NULL";
}
}
foreach(string s in Ar) {
Console.WriteLine(s);
}

using System;
using System.Linq;
class Program
{
private static void Main(string[] args)
{
string[] Ar = new string[10];
var item = from f in Ar
select string.IsNullOrWhiteSpace(f) ? "NULL" : f;
foreach (var i in item)
{
Console.WriteLine(i);
}
Console.ReadLine();
}
}

Here item is iterator in string of array replace all with null if not contains value
string multiplayer = new string[5];
foreach (var item in multiplayers)
{
if (item == null) { Console.WriteLine("Empty"); }
Console.WriteLine(item);
}
remember string of array is not nullable here