编辑代码

/*
final class temp {
    var name :String{
        return "张三"
    }
}

class temp2:temp{
    override var name :String{
        return "李四"
    }
}
*/

/*
struct rectangle{
    var l :Double
    var b :Double
    init(){
        l = 6
        b = 12
    }
}

let a = rectangle()
//let a = rectangle(l:6,b:12)
print(a.l*a.b)
*/