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

namespace MemoryTest5
{
    struct S1
    {
        public int x;
        public int y;
    }
    class C1
    {
        public int x;
        public int y;
    }

    class Program
    {
        public static void f1(S1 structParam)
        {
            structParam.x++;
            structParam.y++;
        }

        public static void f2(ref S1 structParam)
        {
            structParam.x++;
            structParam.y++;
        }

        public static void f3(C1 classParam)
        {
            classParam.x++;
            classParam.y++;
        }

        public static void f4(C1 classParam)
        {
            classParam = new C1();
            classParam.x = 100;
            classParam.y = 100;
        }

        public static void f5(ref C1 classParam)
        {
            classParam = new C1();
            classParam.x = 100;
            classParam.y = 100;
        }



        static void Main(string[] args)
        {
            S1 structvar = new S1();
            C1 classvar = new C1();

            // structVar.x = structVar.y = classvar.x = classvar.y = 0;

            f1(structvar);

            Console.WriteLine(structvar.x + "," + structvar.y);
            // structVar.x ?  structVar.y ? 

            f2(ref structvar);

            Console.WriteLine(structvar.x + "," + structvar.y);
            // structVar.x ?  structVar.y ? 
            
            f3(classvar);

            Console.WriteLine(classvar.x + "," + classvar.y);
            // classvar.x ?  classvar.y ? 

            f4(classvar);

            Console.WriteLine(classvar.x + "," + classvar.y);
            // classvar.x ?  classvar.y ? 

            f5(ref classvar);

            Console.WriteLine(classvar.x + "," + classvar.y);
            // classvar.x ?  classvar.y ? 

            Console.ReadKey();
        }
    }
}