gistfile1.txt

import Foundation

struct Point {
    var x : Double;
    var y : Double;
    init(let inx : Double, let iny: Double){
        x = inx;
        y = iny;
    }
};

let pointA : Point =  Point(inx: 2,iny: 2)
let pointB : Point =  Point(inx: -2,iny: 0)

let pointTemp = Point(PointA.x*PointB.x + PointA.y*PointB.y, -PointA.y*PointB.x + PointA.x*PointB.y)
let degree = atan2(pointTemp.x, pointTemp.y);
degree / M_PI * 180