class ControlStructures {
    val prop = 3

    fun nullFun(): String? = null

    fun test(): Boolean {
        " "
        "Z"
        "Z Z"

        'c'
        5
        5.0
        5.0f
        -5
        +5
        0.0
        -0.0
        1E10
        1E-10

        val qwe = 2
        " $qwe "
        "a\"b"
        "a'b\r\n"
        "5\n 2"
        "\t\t\t"

        if (5 > 3) {
            println("5 > 3")
        }

        for (c in "ABC") {
            println(c)
        }

        for (c: Char in "DEF") {
            println(c.toByte())
        }

        var i = 5
        while (i > 0) {
            i--
            if (i == 3) break
            if (i == 2) {
                continue
            }
        }

        "" is String
        ("" as Any) as String?

        super.equals(this)
        this.equals(this)

        this@ControlStructures.equals(this)

        ControlStructures::test
        ControlStructures::prop
        ControlStructures::class.java

        outer@ for (outerVal in 1..2) {
            inner@ for (innerVal in 3..4) {
                continue@outer
            }
            break@outer
        }

        nullFun()?.let { println(it) }

        i = 5
        do {
            i -= 1
        } while (i > 0)

        "ABC".forEach { println(it.toString()[0]) }

        "ABC".zip("DEF").forEach { println(it.first + " " + it.second) }

        val arr = arrayOf("A", "B", "C")
        println(arr[2])

        val (a, b) = "ABC".zip("DEF")

        val value = if (5 > 3) "a" else "b"
        val list = listOf("A")
        val list2 = listOf("A")

        val type = when (value) {
            in list -> "inlist"
            !in list2 -> "notinlist2"
            is String -> "string"
            is CharSequence -> "cs"
            else -> "unknown"
        }

        val x = when {
            value == "b" -> "B"
            5 % 2 == 0 -> {
                println("A")
                "Q"
            }
            false -> "!"
            else -> "A"
        }

        try {
            5 + 1
            throw Exception()
        } catch (e: Exception) {
            e.printStackTrace()
        } catch (thr: Throwable) {
            System.out.println("error!")
        } finally {
            System.out.println("finally")
        }

        return false
    }
}