public class EdgeLink
{
public int X1;
public int Y1;
public int X2;
public int Y2;
public double b;
    
public EdgeLink next;

public EdgeLink(int x1, int y1, int x2, int y2)
    {
	if(x1>x2)
	    {
		X1 = x2;
		X2 = x1;
		Y2 = y1;
		Y1 = y2;
	    }
	else
	    {
		X1 = x1;
		X2 = x2;
		Y2 = y2;
		Y1 = y1;
	    }	
	b = Y1*X2-X1*Y2;
    }

public void dump()
    {
	System.out.print("(");
	System.out.print(X1);
	System.out.print(", ");
	System.out.print(Y1);
	System.out.print(") - (");
	System.out.print(X2);
	System.out.print(", ");
	System.out.print(Y2);
	System.out.println(")");
    }
}