class mypoint{

var x:Int =1;

var y:Int =1;

init(#x:Int,#y:Int){

self.x = x;

self.y = y;

}

var description:String{//在这里稍有贪心，做一描述成员get变量

get{

return "x=\(x),y=\(y)";

}

}

}

func +(left:mypoint,right:mypoint)->mypoint{

return mypoint(x: left.x+right.x,y: left.y+right.y);

}

var p1:mypoint =mypoint(x: 1,y:1);

var p2:mypoint =mypoint(x: 2,y:2);

println((p1+p2).description);