using System;

​

 public class Program

  {

   public static void Main(string[] args)

    {

      Console.WriteLine("Enter a number and you find if is prime or not");

      int  nr = int.Parse(Console.ReadLine());

​

      Number next = new Number();//create an instance of a class

      next.NextPrime(nr);//access method

​

      Number pr = new Number();

      pr.IsPrime(nr);

        //Console.WriteLine($" {pr.IsPrime(nr)} ,next prime number is {sc.NextPrime(nr)}");

​

      Console.WriteLine(" {0} ,next prime number is {1}",pr.IsPrime(nr),next.NextPrime(nr));

    }

  }

//namespace PrimeNumber

​

  public class Number

  {

    public int nr;

    public bool prime;

    //public Number(){}in cazul asta e necesar sa scriu constructorul(bine el oricum se creeaza) si  properties ?????????????????

    //method IsPrime

    public bool IsPrime(int number)

    {

      int squaredNumber = (int)Math.Sqrt(number);

      for (int i = 2; i <= squaredNumber; ++i)

      {

        if (number % i == 0) return false;

      }

​

      return true;

​

    }

    //method NextPrime

    public int NextPrime(int number)

    {

      while (true)

      {

        number++; //increment 

        bool prime = true;

        int squaredNumber = (int)Math.Sqrt(number);

        for (int i = 2; i <= squaredNumber; i++)

        {

          if (number % i == 0)

          {

           prime = false;

            break;

          }

        }

        if (prime)

          return number;

      }

    }

​

  }

​