test(samples): add new samples

Author: kotlin-samples-pusher-bot

src/test/resources/test-compile-data/jvm/kotlin-web-site/whatsnew18/2b6d4a00abb6d5d1253c7fff4c5235f0.1.kt

@@ -0,0 +1,11 @@
+import kotlin.math.*
+
+fun main() {
+    val num = 27
+    val negNum = -num
+
+    println("The cube root of ${num.toDouble()} is: " + 
+            cbrt(num.toDouble()))
+    println("The cube root of ${negNum.toDouble()} is: " + 
+            cbrt(negNum.toDouble()))
+}

src/test/resources/test-compile-data/jvm/kotlin-web-site/whatsnew18/2b6d4a00abb6d5d1253c7fff4c5235f0.2.kt

@@ -0,0 +1,36 @@
+import kotlin.time.*
+fun main() {
+//sampleStart
+    val timeSource = TimeSource.Monotonic
+    val mark1 = timeSource.markNow()
+    Thread.sleep(500) // Sleep 0.5 seconds
+    val mark2 = timeSource.markNow()
+
+    // Before 1.8.0
+    repeat(4) { n ->
+        val elapsed1 = mark1.elapsedNow()
+        val elapsed2 = mark2.elapsedNow()
+
+        // Difference between elapsed1 and elapsed2 can vary depending 
+        // on how much time passes between the two elapsedNow() calls
+        println("Measurement 1.${n + 1}: elapsed1=$elapsed1, " +
+                "elapsed2=$elapsed2, diff=${elapsed1 - elapsed2}")
+    }
+    println()
+
+    // Since 1.8.0
+    repeat(4) { n ->
+        val mark3 = timeSource.markNow()
+        val elapsed1 = mark3 - mark1
+        val elapsed2 = mark3 - mark2
+
+        // Now the elapsed times are calculated relative to mark3, 
+        // which is a fixed value
+        println("Measurement 2.${n + 1}: elapsed1=$elapsed1, " +
+                "elapsed2=$elapsed2, diff=${elapsed1 - elapsed2}")
+    }
+    // It's also possible to compare time marks with each other
+    // This is true, as mark2 was captured later than mark1
+    println(mark2 > mark1)
+//sampleEnd
+}