using System;

​

// Define an immutable record for a Person

public record Person(string FirstName, string LastName, int Age);

​

// Define an immutable record for an Address

public record Address(string Street, string City, string State, string ZipCode);

​

// Define an immutable record for a Customer, which includes a Person and an Address

public record Customer(Person Person, Address Address, DateTime MemberSince);

​

class Program

{

    static void Main()

    {

        // Create instances of the records

        var person = new Person("John", "Doe", 30);

        var address = new Address("123 Main St", "Anytown", "CA", "12345");

        var customer = new Customer(person, address, DateTime.UtcNow);

​

        // Print the records

        Console.WriteLine(person);

        Console.WriteLine(address);

        Console.WriteLine(customer);

​

        // Use a 'with' expression to create a new record with modified values

        var updatedPerson = person with { Age = 31 };

        Console.WriteLine(updatedPerson);

​

        // Records have value-based equality

        var anotherPerson = new Person("John", "Doe", 30);

        Console.WriteLine($"Are persons equal? {person == anotherPerson}"); // True

    }

}