初始化方法

//默认初始化方法
class Teacher {
    var name:String = "xiaoming";
}

class Human {
    var name :String?;
}

class Personal {
    var name :String!
}

        let teacher = Teacher();
        print(teacher);
        
        let human = Human();
        print(human);
        
        let personal = Personal();
        print(personal);

//便利初始化方法
class Rect{
    var width :Int;
    var height :Int;
    
    init(width:Int, height:Int){
        self.width = width;
        self.height = height;
    }
    
    convenience init(width w:Int, h:Int){
        self.init(width: w, height: h);
    }
    
    convenience init(w:Int, h:Int){
        self.init(width: w, height: h);
    }
    
    func getArea() -> Int {
        return self.width * height;
    }
}


        var rect = Rect(w: 10, h:20);
        print(rect.getArea());
        rect = Rect(width: 20, height: 20);
        print(rect.getArea());
        rect = Rect(width: 20, h:30);
        print(rect.getArea());

//使用闭包来设置默认值的初始化方法
class Student {
    var score:[Int] = {
        var scores:[Int] = Array();
        for m in 0...3{
            scores.append(m);
        }
        return scores;
    }()
    
}


        print(Student().score);