class Person { let name: String let age: Int init(name: String, age: Int) { self.name = name; self.age = age } convenience init(name: String) { self.init(name: name, age: 0) } } let p1 = Person(name: "Robin", age: 30) let p2 = Person(name: "Elisabeth") print(p1.name) print(p1.age) print(p2.name) print(p2.age)