A program which checks a given number is Prime number or not and repeats until user presses something else than ‘Y’.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;


namespace ConsoleFile_Read
{
    class Program
    {
        static void Main(string[] args)
        {

            int num;


            char ch;
            do
            {
                int factors = 0;
                Console.Write("Enter a number ");
                num= int.Parse(Console.ReadLine());
                for (int i = 1; i <= num / 2; i++)
                {
                    if (num % i == 0)
                    {
                        factors++;
                    }


                }
                if (factors > 1)
                    Console.WriteLine( "{0} is not a prime number ",num);
                else
                    Console.WriteLine("{0} is a prime number ", num);

                Console.Write("Do you want to do it again press Y for yes ");
                ch =char.Parse(Console.ReadLine());
            }
            while (ch == 'y' || ch == 'Y');
        }
    }
}

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