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

namespace Chapter3
{
    public class AkunPremium : Akun
    {public AkunPremium(int saldo, string password) : base(saldo,password)
        {this.password = password;
            Saldo = saldo;}
        public new int Saldo
        {
            get
            {return _saldo;}
            set{
                if (value < 0)
                    throw new InvalidOperationException("Saldo tidak bisa kurang dari 0 rupiah");
                else
                    _saldo = value;
            }}
        public override void Setor(int jumlah)
        {Saldo += jumlah+500;}
        public override void Tarik(int jumlah)
        {Saldo -= jumlah+500;
        }}}