计算素数

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            Program p = new Program();
            p.sump();
        }


        public void sump()
        {
            int sum = 0;
            for (int i = 2; i < 100; i++)
            {
                if (this.isZS(i) == 1)
                {
                    Console.WriteLine(i);
                    sum += i;
                }
            }

            Console.WriteLine(sum);
        }

        public int isZS(int Num)
        {
            for (int i = 2; i <= Num / 2; i++)
            {
                if (Num % i == 0)
                {
                    return 0; 
                }
            }

            return 1;
        }
    }
}