Exercise15.kt

class Product(val ean: String, val title: String)

class Book(val publisher: String, val author: String)

fun main() {
    val book = Book(
        ean = "9781617293290",
        title = "Kotlin in Action",
        publisher = "Manning",
        author = "Dmitry Jemerov, Svetlana Isakova"
    )
}