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finding amount of same texts [closed]

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hello I am making a survival game but I don't know how to make if there is some same text in a string it deletes it and then makes it to
<amount><item.title>
here is the code
string[] needs = new string[items.Length];
string text = "";
for (int i = 0; i < items.Length; i++)
{
text += items[i].title + ",";
}

If you're trying to create a string without duplicates based on your list of items, you can first create another list of items that doesn't contain duplicates. You will need LINQ for this.
var distinctItemGroups = items.GroupBy(item => item.Title);
I would also recommend using a StringBuilder for the text. You can then do something like this:
var displayText = new StringBuilder();
foreach (var group in distinctItemGroups)
{
displayText.Append(group.First().Title + ", ");
}
To actually display the text from the StringBuilder just call ToString() on it.

I think you need:
Create a class for count items
public class MyResultModel
{
public string Title { get; set; }
public int Count { get; set; }
public override string ToString()
{
return $"{Count}{Title}";
}
}
And fill the items with
IEnumerable<MyResultModel> myModels = items.GroupBy(x => x)
.Select(x => new MyResultModel() { Count = x.Count(), Title = x.Key });
Then you can generate a string:
string result = string.Join(",", myModels.Select(x=> x.ToString()));

Kattis - Recount C# [closed]

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I'm trying to solve https://open.kattis.com/problems/recount in C#. I have my code written but I know I'm missing something but I'm stuck and I've been working on this for a few days. Whenever I try to run my code I receive a runtime error and I know it's because I need to be able to add a user inputted list to convert to a dictionary but I'm not sure how.
Running on .NET 3.1 for school
Here is the code I have currently
namespace Kattis_Solution___Recount
{
class Program
{
static void Main(string[] args)
{
SortedDictionary<string, int> votes = new SortedDictionary<string, int>();
List<string> names = new List<string>();
string name = "";
name = Console.ReadLine();
Console.Write(name);
Console.Write("\n");
int max = 0;
string winner = "";
while (name[0] != '*')
{
if (votes[name] == 0)
{
names.Add(name);
}
votes[name]++;
if (votes[name] > max)
{
max = votes[name];
winner = name;
}
name = Console.ReadLine();
Console.Write(name);
Console.Write("\n");
}
Console.Write(winner);
Console.Write("\n");
for (int i = 1; i < names.Count; i++)
{
if (votes[names[i]] == max && winner != names[i])
{
Console.Write("Runoff!");
Console.Write("\n");
break;
}
}
}
}
}

You cannot do this if the entry isnt there
if (votes[name] == 0) {
names.Add(name);
}
(unlike some other languages - c++ for example)
You need to do
if (!votes.ContainsKey(name)) {
names.Add(name);
votes[name] = 0;
}
See docs here https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.item?view=net-6.0
The value associated with the specified key. If the specified key is not found, a get operation throws a KeyNotFoundException, and a set operation creates a new element with the specified key.

Why can't you take a variable and multiply it by itself? [closed]

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I was trying to raise a number to a power using a for loop. However, when I wrote this and ran it, it gave me a random number.
using System;
class Program {
static void Main(string[] args) {
var a = 5;
for(int i=0; i<5; i++){
a*=a;
}
Console.WriteLine(a);
}
}
Why is it that this doesn't work? Is a copied only once and can't be used this way?

You can multiply by itself but you can not display result because you overflowing integer (exceed int32 size)(var by default in this case is int32).
Your results :
25
625
390625
out of range (exceeded size).
Answer for you question should be:
var initialValue = 2;
var exponent = 4;
var power = initialValue;
for (int i = 0; i < exponent ; i++)
{
initialValue *= power;
}
OR
var exponentiation = Math.Pow(2, 5);

C# Can I identify what Random selects between the range? [closed]

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I want to be able to determine what the value is selected when I get a random number in windows forms.
For example, int mynum = numbers[rand.Next(0,7)];
I know the range is between 0 and 7, but I want to be able to identify what number is selected. e.g. numbers[3]
The following is the code I have. I have read binary values into an array int [] numbers and passed it through the following method. It generates my random 3 bit binary value, but I am making a small quiz where the number identified is the value the random number selects (e.g. the location 3 is the correct value for the item stored there, numbers[i] ==answer).
Is there a way to access this value?
public void generateBinary3bit(int[] numbers, Form1 f1)
{
Random rand = new Random();
int mynum = numbers[rand.Next(0,7)];
**int ans = numbers[rand];**
f1.lblBinaryText.Text = mynum.ToString();
}
For context, I am reading in the values into the array here:
int [] numbers = new int[8];
public void readNumbers(int[]numbers, Form1 F1)
{
try
{
StreamReader sr = new StreamReader(#"C:\BinaryNumbers.csv");
while(sr.ReadLine() !=null)
{
for (int i = 0; i < numbers.Length; i++)
{
numbers[i] = Convert.ToInt32(sr.ReadLine());
answer = i;
}
}
sr.Close();
}
catch ( Exception e)
{
}
}
Thank you,

Just assign some variable to the result of the rand.Next() before using it in the array:
Random rand = new Random();
int randIndex = rand.Next(0,7);
int mynum = numbers[randIndex];
and you are good to go.

display value of database [closed]

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i have code like this
Global.dbCon.Open();
int idQuestion;
kalimatSql = kalimatSql;
Global.reader = Global.riyeder(kalimatSql);
if (Global.reader.HasRows) {
while (Global.reader.Read()) {
idQuestion = Convert.ToInt32(Global.reader.GetValue(0));
//messageBox.Show(idQuestion.ToString()); -->first message box
}
}
//messageBox.Show(idQuestion.ToString()); -->second message box
Global.dbCon.Close();
i don't have problem to display first messagebox, but how to display second messagebox
edited
i try to make code from #rhughes become a function (class) like this following code
Global.dbCon.Open();
List<int> idQuestions = new List<int>();
Global.reader = Global.riyeder(kalimatSql);
if (Global.reader.HasRows) {
while (Global.reader.Read()) {
int idQuestion = Convert.ToInt32(Global.reader.GetValue(0));
idQuestions.Add(idQuestion);
}
}
Global.dbCon.Close();
foreach (int id in idQuestions) {
return id;
}
but it's no work because not all code paths return a value...i wonder how corret way to do it?

Try something like this:
Global.dbCon.Open();
List<int> idQuestions = new List<int>();
kalimatSql = kalimatSql;
Global.reader = Global.riyeder(kalimatSql);
if (Global.reader.HasRows) {
while (Global.reader.Read()) {
int idQuestion = Convert.ToInt32(Global.reader.GetValue(0));
idQuestions.Add(idQuestion);
}
}
Global.dbCon.Close();
foreach (int id in idQuestions)
{
messageBox.Show(id.ToString());
}
What we are doing here is adding all of the question ids into a list and then displaying each of them afterwards.