Kotlin - Hello World, Define variable and const

Hello.kt

fun main(args: Array<String>) {  

   println("Hello, world!")

}

Define variable

package examples

fun main(args: Array<String>) {

    // variable type declaration

    var i = 0;

    var i2: Int = 0

    println("hwllo " + ++i + ++i2)

    // can skip type declaration

    var s = "string"

    println("string: " + s)

    var c : Char = 'a'

    println("Char" + c)

    var b = true

    var d = 0.123

    var list = listOf("a","b","c")

    println(list)

    var set : Set<String> = setOf("d","e", "f", "d")

    println(set)

    var map = mapOf("a" to 1, "b" to 2)

    println(map)

    // read only => val

    val pp = i

    println(pp)

}

Declare const

package examples

const val MAX = 100

fun main() {

    // const can't be declared within method

//    const val MAX = 100

    println(MAX)

}