September 2017 Update

Task/Arithmetic-Integer/Kotlin/arithmetic-integer.kotlin

@@ -0,0 +1,41 @@
+// version 1.1
+
+fun main(args: Array<String>) {
+    val r = Regex("""-?\d+[ ]+-?\d+""")
+    while(true) {
+        print("Enter two integers separated by space(s) or q to quit: ")
+        val input: String = readLine()!!.trim()
+        if (input == "q" || input == "Q") break
+        if (!input.matches(r)) {
+            println("Invalid input, try again")
+            continue
+        }
+        val index = input.lastIndexOf(' ')
+        val a = input.substring(0, index).trimEnd().toLong()
+        val b = input.substring(index + 1).toLong()
+        println("$a + $b = ${a + b}")
+        println("$a - $b = ${a - b}")
+        println("$a * $b = ${a * b}")
+        if (b != 0L) {
+            println("$a / $b = ${a / b}")  // rounds towards zero
+            println("$a % $b = ${a % b}")  // if non-zero, matches sign of first operand
+        }
+        else {
+            println("$a / $b = undefined")
+            println("$a % $b = undefined")
+        }
+        val d = Math.pow(a.toDouble(), b.toDouble())
+        print("$a ^ $b = ")
+        if (d % 1.0 == 0.0) {
+            if (d >= Long.MIN_VALUE.toDouble() && d <= Long.MAX_VALUE.toDouble())
+                println("${d.toLong()}")
+            else
+                println("out of range")
+        }
+        else if (!d.isFinite())
+            println("not finite")
+        else
+            println("not integral")
+        println()
+    }
+}