September 2017 Update

Task/Generator-Exponential/Kotlin/generator-exponential.kotlin

@@ -0,0 +1,37 @@
+// version 1.1.0
+// compiled with flag -Xcoroutines=enable to suppress 'experimental' warning
+
+import kotlin.coroutines.experimental.buildSequence
+
+fun generatePowers(m: Int) =
+    buildSequence {
+        var n = 0
+        val mm = m.toDouble()
+        while (true) yield(Math.pow((n++).toDouble(), mm).toLong())
+    }
+
+fun generateNonCubicSquares(squares: Sequence<Long>, cubes: Sequence<Long>) =
+    buildSequence {
+        val iter2 = squares.iterator()
+        val iter3 = cubes.iterator()
+        var square = iter2.next()
+        var cube = iter3.next()
+        while (true) {
+            if (square > cube) {
+                cube = iter3.next()
+                continue
+            } else if (square < cube) {
+                yield(square)
+            }
+            square = iter2.next()
+        }
+    }
+
+fun main(args: Array<String>) {
+    val squares = generatePowers(2)
+    val cubes = generatePowers(3)
+    val ncs = generateNonCubicSquares(squares, cubes)
+    print("Non-cubic squares (21st to 30th) : ")
+    ncs.drop(20).take(10).forEach { print("$it ") } // print 21st to 30th items
+    println()
+}