public class Point3d {
  
  public double x, y, z;
  
  public Point3d() { 
    this(0.0,0.0,0.0); 
  }
  
  public Point3d(double x, double y, double z) {
    this.x = x;
    this.y = y;
    this.z = z;
  }
  
  public String toString() {
    return "("+x+","+y+","+z+")"; 
  }
  
  private static final double EPSILON = 0.000001;

  public static boolean coincident(Point3d p1, Point3d p2) {
    return Math.abs(p1.y-p2.y) < EPSILON && Math.abs(p1.x-p2.x) < EPSILON;
  }
  
}