Lesson16

task4

Console.Write(" Enter the price: ");
var price = int.Parse(Console.ReadLine() ?? "0");

Console.Write(" Enter the strstegy: ");
var namestrategy = Console.ReadLine()?.ToLower();


var strategies = new Dictionary<string, Func<double, double>>()
{
{ "none", p => p },
{ "vip", p => p * 0.8 },
{ "blackfriday", p => p * 0.5 }
};

if (strategies.ContainsKey(namestrategy))
{
    Console.WriteLine(strategies[namestrategy](price));
}
else
    Console.WriteLine("Strategy not found.");

task5

public class BankAccount
{
    public event EventHandler<decimal>? BalanceChanged;

    private decimal balance;

    public void Deposit(decimal amount)
    {
        balance += amount;
        BalanceChanged?.Invoke(this, balance);
    }

    public void Withdraw(decimal amount)
    {
        if (balance >= amount)
        {
            balance -= amount;
            BalanceChanged?.Invoke(this, balance);
        }
        else
        {
            Console.WriteLine("Insufficient funds.");
        }
    }
}