var val  deference in kotlin 

fun main() {

    var Android_Programing_language: String = "java"
    println("android official programing language: " + Android_Programing_language)


    Android_Programing_language = "Kotline"
    println("2019 google announced android official programing language: " + Android_Programing_language)

    val Android_MultiPlatform_language: String = "Dart"
    println("multiple device run : " + Android_MultiPlatform_language)

    /*
    Android_MultiPlatform_language=""

    /*
    note: var--------------valu changable
    note: val--------------valu not changable (final)
     */

     */
}