C# ref与out

        public static void F(int a)
        { 
            a++;
        }

        public static void Fout(out int a)
        {
            a = 100; //必须初始化，否则编译报错
            a++;
        }

        public static void Fref(ref int a)
        {
            a++;
        }

        static void Main(string[] args)
        {
            int a = 0;
            F(a); //默认传参
            Console.WriteLine(a);
            Fout(out a); //out传参
            Console.WriteLine(a);
            Fref(ref a); //ref传参
            Console.WriteLine(a);
        }