Returns this value incremented by one.
fun main(args: Array<String>) {
//sampleStart
val a = 3
val b = a.inc()
println(a) // 3
println(b) // 4
var x = 3
val y = x++
println(x) // 4
println(y) // 3
val z = ++x
println(x) // 5
println(z) // 5
//sampleEnd
}