September 2017 Update

Task/Function-prototype/Kotlin/function-prototype.kotlin

@@ -0,0 +1,35 @@
+// version 1.0.6
+
+interface MyInterface {
+    fun foo()                     // no arguments, no return type
+    fun goo(i: Int, j: Int)       // two arguments, no return type
+    fun voo(vararg v: Int)        // variable number of arguments, no return type
+    fun ooo(o: Int = 1): Int      // optional argument with default value and return type Int
+    fun roo(): Int                // no arguments with return type Int
+    val poo: Int                // read only property of type Int
+}
+
+abstract class MyAbstractClass {
+    abstract fun afoo()           // abstract member function, no arguments or return type
+    abstract var apoo: Int        // abstract read/write member property of type Int
+}
+
+class Derived : MyAbstractClass(), MyInterface {
+    override fun afoo() {}
+    override var apoo: Int = 0
+
+    override fun foo() {}
+    override fun goo(i: Int, j: Int) {}
+    override fun voo(vararg v: Int) {}
+    override fun ooo(o: Int): Int = o  // can't specify default argument again here but same as in interface
+    override fun roo(): Int = 2
+    override val poo: Int = 3
+}
+
+fun main(args: Array<String>) {
+    val d = Derived()
+    println(d.apoo)
+    println(d.ooo())  // default argument of 1 inferred
+    println(d.roo())
+    println(d.poo)
+}