Program.cs

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

namespace SalaDeFitness
{
    class Program
    {
        static void Main(string[] args)
        {
       
            Client client = new Client("Aaaa", "BBB", "1234567890123", "ion.popescu@example.com", "0712345678");
            Console.WriteLine(client.AfiseazaDetalii());

            Console.WriteLine();

            Antrenor antrenor = new Antrenor("Ionescu", "Maria", "9876543210987", "maria.ionescu@example.com", "0798765432", "Fitness & Cardio");
            Console.WriteLine(antrenor.AfiseazaDetalii());

            Console.WriteLine();

            
            Angajat angajat = new Angajat("Georgescu", "Ana", "1112223334445", "ana.georgescu@example.com", "0722334455", "Receptioner");

            Console.WriteLine(angajat.AfiseazaDetalii());

            Abonament abonament = new Abonament(
       "Popescu", "Ion", "1234567890123", "ion.popescu@example.com", "0712345678",
       "1", DateTime.Now, DateTime.Now.AddMonths(3)
   );
            Console.WriteLine(abonament.AfiseazaDetalii());
            Console.ReadLine();
        }
    }
}