28-2静态方法

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

namespace jingtai
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = 9098;
            int b = 231;
            int sum = jisuan.Add(a,b);
            int dif = jisuan.Sub(a, b);
            Console.WriteLine("{0}\n{1}",sum,dif);
        }
    }
    class jisuan
    {
        public static int Add(int x, int y)
        {
            return x + y;
        }
        public static int Sub(int x, int y)
        {
            return x - y;
        }
    }
}