static void Main(string[] args)
{
var a11 = new LineSegment.Point(double.Parse(ReadLine()), double.Parse(ReadLine()));
var b12 = new LineSegment.Point(double.Parse(ReadLine()), double.Parse(ReadLine()));
var a21 = new LineSegment.Point(double.Parse(ReadLine()), double.Parse(ReadLine()));
var b22 = new LineSegment.Point(double.Parse(ReadLine()), double.Parse(ReadLine()));
var ls1 = new LineSegment(a11, b12);
var ls2 = new LineSegment(a21, b22);
LineSegment.AreTheyCrossing(ls1, ls2);
ReadKey(true);
}