My first Kotlin program

//This is my first Kotlin program
fun main () {
    //定义常量
    val name = "John Young"
    println("Hello " + name +"! Welcome to Kotlin!")

    //定义变量
    var n = 10
    println(a)

    /*var n: Int
    n = 10
    var n: Int = 10*/

    for (i in 1..5) {
        println("i = $i")
    }

    /*for (i in 1..10 step 2) {
        println("i = $i")
    }

    for (i in 10 downTo 1 step 2) {
        println("i = $i")
    }*/

    n = 88
    println("这次考试我得了${n}分")
    //println("You have ${unreadCount + readCount} total messages in your inbox.")

    //数位运算
    var a: Int = 5
    var b: Int = 2
    var c: Int = a and b    //与运算
    var d: Int = a or b     //或运算
    var e: Int = a xor b    //异或运算
    var f: Int = a shl 1    //左移
    var g: Int = a shr 1    //右移
    var h: Int = a ushr 1   //无符右移
    var i: Int = b.inv()    //取反

    var k: Boolean = a in 1..10
    println(k)

    val s =
        """
        This is a Kotlin program.
        And nice to meet you everybody!
        """.trimIndent()
    println(s)
    
    /*
    val s =
        """
        Hello, this is another example.
        Let's see what the difference is.
        And this is the character ${'$'}.
        """
    println(s)
     */

    println("Hello Kotlin" + true)
}