C#的参数修饰符out，params,ref 参数修饰符params,ref,out，

using System;

namespace ParamsProgram
{
    class TestParams
    {
        public static void Main(string[] args)//static void Main(string[] args)
        {
            int m ;//= 10;
            int[] arr = new int[80];
         for (int i = 0; i < arr.Length; i++)
         {
             arr[i] = i;

         }
            ParamsProgram.TestParams t = new TestParams();
            //t.check(5,6,7,8,9,1);
            
            t.outPara(out m);
            //t.changeNum(m);
            Console.WriteLine(m);
            Console.ReadLine();
        }
        
        public void check(params int[] arr)
        {
            foreach (var i in arr)
            {
                Console.WriteLine(i);
            }
        }
        public void outPara(out int i)
        { 
            i = 9999;
        }
        public void changeNum(int a)
        {
            a = 100;
        }
    }
}