Sinflar va obyektlar

class Talaba(val ism: String, var ball: Int)

fun main() {
    val t = Talaba("Malika", 88)

    println(t.ism)
    println(t.ball)

    t.ball = 95
    println(t.ball)
}

class Kitob(val nom: String, var narx: Int)

fun main() {
    val k = Kitob("O'tkan kunlar", 45000)

    k.narx = 50000
    println("${k.nom} - ${k.narx}")
}

class Doira(val radius: Double) {
    val yuza: Double
    val uzunlik: Double

    init {
        require(radius > 0) { "Radius musbat bo'lishi kerak" }
        yuza = Math.PI * radius * radius
        uzunlik = 2 * Math.PI * radius
    }
}

fun main() {
    val d = Doira(3.0)
    println("%.2f".format(d.yuza))
    println("%.2f".format(d.uzunlik))

    try {
        Doira(-1.0)
    } catch (e: IllegalArgumentException) {
        println("Xato: ${e.message}")
    }
}

class Hisob(val egasi: String, boshlangich: Int) {
    var qoldiq = boshlangich
        private set

    val ochilganYil = 2026

    fun qoshish(summa: Int) {
        if (summa > 0) qoldiq += summa
    }

    fun yechish(summa: Int): Boolean {
        if (summa > qoldiq) return false
        qoldiq -= summa
        return true
    }
}

fun main() {
    val h = Hisob("Husanboy", 500000)

    h.qoshish(250000)
    println(h.qoldiq)

    println(h.yechish(100000))
    println(h.yechish(9000000))
    println(h.qoldiq)
}

class Odam(val ism: String, val familiya: String) {
    val toliqIsm: String
        get() = "$familiya $ism"

    var yosh: Int = 0
        set(qiymat) {
            field = if (qiymat < 0) 0 else qiymat
        }
}

fun main() {
    val o = Odam("Dilnoza", "Yusupova")
    println(o.toliqIsm)

    o.yosh = 25
    println(o.yosh)

    o.yosh = -5
    println(o.yosh)
}

class Vaqt(val soat: Int, val daqiqa: Int) {
    constructor(soat: Int) : this(soat, 0)

    constructor(matn: String) : this(
        matn.split(":")[0].toInt(),
        matn.split(":")[1].toInt()
    )

    override fun toString() = "%02d:%02d".format(soat, daqiqa)
}

fun main() {
    println(Vaqt(10, 30))
    println(Vaqt(9))
    println(Vaqt("14:45"))
}

class Nuqta(val x: Int, val y: Int) {
    override fun toString() = "($x, $y)"

    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (other !is Nuqta) return false
        return x == other.x && y == other.y
    }

    override fun hashCode() = 31 * x + y
}

fun main() {
    val a = Nuqta(3, 7)
    val b = Nuqta(3, 7)

    println(a)
    println(a == b)
    println(a === b)
    println(setOf(a, b).size)
}

class Hisoblagich {
    private var soni = 0
    internal val nomi = "asosiy"

    fun oshir() {
        soni++
        yozib_ol()
    }

    private fun yozib_ol() {
        println("Hozirgi qiymat: $soni")
    }

    fun qiymat() = soni
}

fun main() {
    val h = Hisoblagich()
    h.oshir()
    h.oshir()
    println(h.qiymat())
    println(h.nomi)
}

class Talaba(val ism: String) {
    var ball: Int = 0

    fun ballQoy(ball: Int): Talaba {
        this.ball = ball
        return this
    }

    fun korsat(): Talaba {
        println("$ism: $ball")
        return this
    }
}

fun main() {
    Talaba("Aziza").ballQoy(95).korsat()

    val t = Talaba("Malika")
    t.ballQoy(88).korsat()
}

class Quti(var ichi: String)

fun main() {
    val a = Quti("olma")
    val b = a

    b.ichi = "anor"

    println(a.ichi)
    println(b.ichi)
    println(a === b)
}