hw_margarita.kt

abstract class Books(
    val author: String,
    val name: String,
    val special: String,
    val price: Double
) {
    abstract fun printDescription()
}

abstract class Fiction(
    author: String,
    name: String,
    price: Double,
    val genre: String
) : Books(
    author,
    name,
    "Художественная литература",
    price
)

abstract class Applied(
    author: String,
    name: String,
    price: Double,
    val genre: String
) : Books(
    author,
    name,
    "Прикладная литература",
    price
)

abstract class Study(
    author: String,
    name: String,
    price: Double,
    val subject: String
) : Books(
    author,
    name,
    "Учебная литература",
    price
)

class Novel(
    author: String,
    name: String,
    price: Double
) : Fiction(
    author,
    name,
    price,
    "Роман"
) {
    override fun printDescription() =
        println("$special, '$name' ($author), Жанр: $genre, Цена: $price $")
}

class Psychology(
    author: String,
    name: String,
    price: Double
) : Applied(
    author,
    name,
    price,
    "Психология"
) {
    override fun printDescription() =
        println("$special, '$name' ($author), Жанр: $genre, Цена: $price $")
}

class Mathematics(
    author: String,
    name: String,
    price: Double
) : Study(
    author,
    name,
    price,
    "Математика"
) {
    override fun printDescription() =
        println("$special, '$name' ($author), Предмет: $subject, Цена: $price $")
}

fun main() {

    val greenMile = Novel(
        author = "Стивенг Кинг",
        name = "Зеленая Миля",
        price = 12.0
    )

    val howToWinFriendsAndInfluencePeople = Psychology(
        author = "Дейл Карнеги",
        name = "Как завоёвывать друзей и оказывать влияние на людей",
        price = 3.99
    )

    val geometry10_11 = Mathematics(
        author = "Атанасян",
        name = "Геометрия для 10-11 классов",
        price = 10.0
    )

    val books = listOf(greenMile, howToWinFriendsAndInfluencePeople, geometry10_11)
    books.forEach { book ->
        book.printDescription()
    }
}