Generate Prime Numbers

using System;
public class Program
{
    static void Main(string[] args)
    {
        var results = GenerateSieve(1000);
        var i=0;
        foreach (var item in results)
        {
            if(item) Console.Write(i + " ");
            i++;
        }
    }
 
    static bool[] GenerateSieve(int num)
    {
        // Creating an array indicating whether numbers are prime.
        bool[] isPrime = new bool[num + 1];
        for (int i = 2; i <= num; i++) isPrime[i] = true;
 
        // Removing out multiples.
        for (int i = 2; i <= num; i++)
        {
            // Check if i is prime.
            if (isPrime[i])
            {
                // Eliminate multiples of i.
                for (int j = i * 2; j <= num; j += i)
                    isPrime[j] = false;
            }
        }
        return isPrime;
    }
}

Source: ideone.com

Similar codes

0 vote219 views1 answer
C# open config file by path
C#
0 vote217 views2 answers
== vs equals c#
C#
0 vote217 views1 answer
C# skip debug attribute
C#
0 vote211 views1 answer
How to make soft body OBJECT in unity
C#
2 votes201 views1 answer
C# combobox prevent typing
C#
1 vote199 views1 answer
C# list get element from end
C#
1 vote209 views1 answer
C# right click event
C#
3 votes206 views1 answer
Unity how to wait for seconds without coroutine
C#
-1 vote216 views1 answer
Dinktopdf page break
C#
1 vote212 views1 answer
C# get binary array from int
C#