package test1

fun main() {
    println("Hello world!")
}

var x = 2
var y: Int = 2
val z: Int = 2


fun main(array: Array<String>) {
    println(array.contentToString())
    print("Hello ")
    print("world!\n")
    main()
    println(42)
    val sum = sum(1, 2)
    println(sum)
    val sum2 = sum2(1, 6)
    println(sum2)
    println("总和为：$sum and $sum2 那么sum和sum2相加为：${sum + sum2}")

    val basicSyntax = BasicSyntax(2.0000, 6.0)
    println(basicSyntax.percent)

    // 模板字符串
    var a = 1
    val b = "a 是 $a"
    a = 2
    val c = "${b.replace("是", "就是")}，但是现在的a是 $a"
    println(c)

    // 返回最大值
    println(BasicSyntax(1.0, 2.0).maxOf(1, 2))
    println(BasicSyntax(1.0, 2.0).maxOf2(1, 2))
    println(maxOf3(1, 2))

    // 循环
    val items = listOf("11", "22", "23", "24", "25")
    for (item in items) {
        println(item)
    }
    for (index in items.indices) {
        println(index)
    }

    // 有多少元素
    val readOnlyShapes = mutableListOf("triangle", "square", "circle")
    println("readOnlyShapes有：${readOnlyShapes.count()}个元素")
    println("triangle" in readOnlyShapes)
    // 添加元素
    readOnlyShapes.add("YYY")
    println(readOnlyShapes)
    // 移出元素
    readOnlyShapes.remove("triangle")
    println(readOnlyShapes)

    // Set相关操作
    val readOnlyFruit = setOf("apple", "banana", "cherry", "cherry")
    val mutableSetOf = mutableSetOf(readOnlyFruit)
    println(readOnlyFruit)
    println(mutableSetOf)
    println("This set has ${readOnlyFruit.count()} items")


    // map 操作
    val readOnlyJuiceMenu = mapOf("apple" to 100, "kiwi" to 190, "orange" to 100)
    println(readOnlyJuiceMenu)
    // {apple=100, kiwi=190, orange=100}

    // Mutable map with explicit type declaration
    val juiceMenu: MutableMap<String, Int> = mutableMapOf("apple" to 100, "kiwi" to 190, "orange" to 100)
    println(juiceMenu)

    val SUPPORTED = setOf("HTTP", "HTTPS", "FTP")
    val requested = "smtp"
    val isSupported = requested.uppercase() in SUPPORTED // Write your code here
    println("Support for $requested: $isSupported")

    val number2word = mapOf(1 to "one", 2 to "tow") // Write your code here
    val n = 2
    println("$n is spelt as '${number2word[2]}'")
}

fun sum(a: Int, b: Int): Int {
    return a + b
}

fun sum2(a: Int, b: Int) = a + b

class BasicSyntax(height: Double, length: Double) {
    val percent = (height + length) * 2
    fun maxOf(a: Int, b: Int): Int {
        if (a > b) {
            return a
        } else {
            return b
        }
    }

    fun maxOf2(a: Int, b: Int): Int {
        return if (a > b) {
            a
        } else {
            b
        }
    }
}

/* The comment starts here
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and ends here. */


fun maxOf3(a: Int, b: Int) = if (a > b) a else b