import Foundation

print("Hello,World!")

struct Point {
    var x=0.0,y=0.0
};
struct Size {
    var width=0.0,height=0.0
};
struct Rect {
    //创建对象
    var origin=Point()
    var  size=Size()
    //创建对象 @lazy 从orgin 和size计算出来的
    var center:Point{
     get{
           let x=origin.x+size.width/2
           let y=origin.y+size.height/2;
           return Point(x: x,y: y)
        }

    }
    func getCenter()->(Double,Double)
    {
        let x=origin.x+size.width/2
        let y=origin.y+size.height/2;
        return(x,y)
    }

};