How it works...

Let's try to understand the methods by which we were able to read input in Kotlin.

Behind the scenes, Kotlin.io uses java.io for the input-output. So println is basically System.out.println, but with additional power by Kotlin to use String templates and inline functions, which makes writing extremely simple and concise.

This is a part of the actual code from Kotlin stdlib used for Console IO:

/** Prints the given message and newline to the standard output stream. */
@kotlin.internal.InlineOnly
public inline fun println(message: Any?) {
   System.out.println(message)
}