Add tasks for all the new languages

Task/Address-of-a-variable/Swift/address-of-a-variable.swift

@@ -0,0 +1,31 @@
+class MyClass {
+}
+
+func printPointer<T>(ptr: UnsafePointer<T>) {
+  println(ptr)
+}
+
+func test() {
+  var x = 42
+  var y = 3.14
+  var z = "foo"
+  var obj = MyClass()
+
+  // Use a pointer to a variable on the stack and print its address
+  withUnsafePointer(&x) { ptr in println(ptr) }
+  withUnsafePointer(&y) { ptr in println(ptr) }
+  withUnsafePointer(&z) { ptr in println(ptr) }
+  withUnsafePointer(&obj) { ptr in println(ptr) }
+
+  // Alternately:
+  printPointer(&x)
+  printPointer(&y)
+  printPointer(&z)
+  printPointer(&obj)
+
+  // Printing the address of an object that an object reference points to
+  // In Swift 3, unsafeAddress is removed
+  println(Unmanaged.passUnretained(obj).toOpaque())
+}
+
+test()