val d1 : Int = 10
var d2 : Int = 20
lateinit var s1:String
val d4 : Int by lazy{
println("lazy")
10
}
fun main(){
println(d4+10)
}
fun sum(data:Int):Int{
var sum :Int= 0
for(i in 1..data){
sum+=i
}
return sum
}
var data1:Int? = null
val data:Array<Int> = Array(3, {0})
val data=arrayOf<Int>(0,0,0)
val data=intArrayOf(0,0,0)
data[0] = 10
data.set(2,30)
data.get(2)
data.size
var list = listOf<Int>(1,2,3)
list.get(1)
list[0]
var mutableList = mutableListOf<Int>(1,2,3)
mutableList.add(3,4)
mutableList.set(0,5)
mutableList.get(0)
var map=mapOf<String, String>(pair("one", "hello"), "two" to "world")
map.size
map.get("one")
map.get("two")