September 2017 Update

Task/Gray-code/Kotlin/gray-code.kotlin

@@ -0,0 +1,24 @@
+// version 1.0.6
+
+object Gray {
+    fun encode(n: Int) = n xor (n shr 1)
+
+    fun decode(n: Int): Int {
+        var p  = n
+        var nn = n
+        while (nn != 0) {
+            nn = nn shr 1
+            p = p xor nn
+        }
+        return p
+    }
+}
+
+fun main(args: Array<String>) {
+    println("Number\tBinary\tGray\tDecoded")
+    for (i in 0..31) {
+        print("$i\t${Integer.toBinaryString(i)}\t")
+        val g = Gray.encode(i)
+        println("${Integer.toBinaryString(g)}\t${Gray.decode(g)}")
+    }
+}