Prime number generator

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

-1 vote327 views1 answer
C# file directory selection
C#
2 votes340 views1 answer
Unity deactive code from code
C#
2 votes329 views1 answer
Unity get current object
C#Unity
0 vote345 views1 answer
Zoom gedit
C#
2 votes335 views1 answer
How to pause physics in unity c#
C#
0 vote304 views1 answer
C# change all values in dictionary
C#
0 vote352 views1 answer
C# find comma in text and remove
C#
174 votes591 views6 answers
C# foreach
C#
1 vote344 views1 answer
Make an object disappear from a c# script unity
C#
1 vote408 views3 answers
Unity follow object
C#Unity