1.kt

fun main(args: Array<String>) {
    val a = args[0].toDouble()
    val b = args[1].toDouble()
    val c = args[2].toDouble()
    
    val r = println(x1(a, b, c))
    println(r)
}

// fun run(action: () -> Any): Any = <...>

fun x1(a: Double, b: Double, c: Double): Unit = run({ 
    val d = b*b - 4*a*c
    ((-b + Math.sqrt(d)) / 2*a).toFloat()
})

fun x2(a: Double, b: Double, c: Double) = run({ 
    val d = b*b - 4*a*c
    (-b - Math.sqrt(d)) / 2*a
})