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// Main.kt fun main() { println("Hello, Kotlin!") // Variables: val (immutable), var (mutable) val name = "Alice" // immutable var age = 30 // mutable age = 31 // String templates println("My name is $name and I am $age years old.") println("Next year I'll be ${age + 1}") // Null safety var nullable: String? = null println(nullable?.length) // safe call: prints null println(nullable ?: "default") // elvis operator // When expression (switch replacement) val day = 3 val dayName = when(day) { 1 -> "Monday" 2 -> "Tuesday" 3 -> "Wednesday" in 4..5 -> "Thursday or Friday" else -> "Weekend" } println(dayName) }
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