C#

class Line
    {
        Pointless p1;
        Pointless p2;
        double slope;

        public Line()
        {
            
            reiknaslope();
        }

        private double reiknaslope()
        {
            p1.pointX = 2;
            p1.pointY = -4;
            p2.pointX = -5;
            p2.pointY = 3;
            slope = (p2.pointY - p1.pointY) / (p2.pointX - p1.pointX);
            return slope;
        }
    }

class Line
    {

        //Pointless p1;
        //Pointless p2;
        
        public double slope;

        public Line()
        {
            
            reiknaslope();
        }

        private double reiknaslope()
        {
            Pointless pa;
                Pointless pb;
            pa = new Pointless();
            pb = new Pointless();
            //p1.pointX = 2;
            //p1.pointY = -4;
            //p2.pointX = -5;
            //p2.pointY = 3;
            //slope = (p2.pointY - p1.pointY) / (p2.pointX - p1.pointX);

            return slope = (pb.pointY - pa.pointY) / (pb.pointX - pb.pointY);
            Console.WriteLine(slope.ToString());
        }
    }

public Pointless()
        {
            X = 0;
            Y = 0;
        }

Pointless p1 = new Pointless ( 2 , -4 ) ;
Pointless p2 = new Pointless ( -5 , 3 ) ;
 
Line l = new Line ( p1 , p2 ) ;
 
System.Console.WriteLine ( "{0: 0.00}" , l.Slope ) ; // SPACE added after : to avoid smiley, remove it

leslie wu wrote:

I tried dragging the DLL into application it works, but it doesnt work when I tried to add reference to it