Kotlin - basic types and variables - Being a Variable - Convert the Numeric value(toByte、toShort、toInt、toLong、toDouble)

Head First Kotlin
A Brain-Friendly Guide
楽天ブックス(Kobo) 紀伊國屋書店(Kinoppy)

開発環境

• macOS Mojave - Apple (OS)
• Windows 10 Pro (OS)
• IntelliJ IDEA CE(Community Edition) (IDE(統合開発環境))
• Kotlin (プログラミング言語)

Head First Kotlin: A Brain-Friendly Guide (Dawn Griffiths(著)、David Griffiths(著)、O'Reilly Media)のChapter 2(basic types and variables - Being a Variable)、Sharpen your pencil(43)の解答を求めてみる。

コード

fun main() {
    var x: Double = 65.2
    println(x)

    var isPunk = true
    println(isPunk)

    var message = "Hello"
    println(message)

    var y = 7
    println(y)
    var z: Int = y
    println(z)

    y += 50
    println(y)

    var s: Short
    var bigNum: Long = y.toLong()
    println(bigNum)

    var b: Byte = 2
    println(b)

    var smallNum = b.toShort()
    println(smallNum)

    b = smallNum.toByte()
    println(b)

    isPunk = false
    println(isPunk)

    var k = y.toDouble()
    println(k)

    b = k.toByte()
    println(b)

    s = 0b1001
    println(s)
}

入出力結果

65.2
true
Hello
7
7
57
57
2
2
2
false
57.0
57
9

Process finished with exit code 0