using System;
using System.Diagnostics;

namespace Recursion
{
    class Program
    {
        static void test1(ref int i)
        {
            i++;
            if (i > 5)
            {
                return;
            }
            Debug.WriteLine(string.Format("Before {0}", i));
            test1(ref i);
            Debug.WriteLine(string.Format("After {0}", i));
        }

        static void test2(int i)
        {
            i++;
            if (i > 5)
            {
                return;
            }
            Debug.WriteLine(string.Format("Before {0}", i));
            test2(i);
            Debug.WriteLine(string.Format("After {0}", i));
        }

        static void Main(string[] args)
        {
            int i = 0;
            test1(ref i);
            Debug.WriteLine(string.Empty);
            test2(0);
        }
    }
}