Stair-climbing puzzle: Difference between revisions

</pre>

=={{header|Kotlin}}==

{{trans|D}}

<lang scala>// version 1.2.0

import java.util.Random

val rand = Random(6321L) // generates short repeatable sequence

var position = 0

fun step(): Boolean {

val r = rand.nextBoolean()

if (r)

println("Climbed up to ${++position}")

else

println("Fell down to ${--position}")

return r

}

fun stepUp() {

while (!step()) stepUp()

}

fun main(args: Array<String>) {

stepUp()

}</lang>

{{out}}

<pre>

Fell down to -1

Fell down to -2

Climbed up to -1

Climbed up to 0

Fell down to -1

Climbed up to 0

Fell down to -1

Climbed up to 0

Climbed up to 1