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



namespace exo3
{
    public class storing
    {
        private long _test;
        public long test;

        public static long toChangeTest(long a)
        {
            
            if (a > 0)
            {
                return test = a;
            }
            else return a;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            long a;
            Console.WriteLine("saisir un long :");
            a = Console.Read();
            a = storing.toChangeTest(a);

            Console.WriteLine("la valeur de a est : " + a);
            Console.Read();
        }
    }
}