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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int iVariableNonInit;

            Getter(out iVariableNonInit);
            Console.WriteLine(iVariableNonInit);
            Ajouter10(ref iVariableNonInit);
            Console.WriteLine(iVariableNonInit);

            Console.ReadLine();

        }

        public static void Getter (out int a)
        {
            a = 10;
        }

        public static void Ajouter10(ref int a)
        {
            a += 20;
        }
    }
}