class MyVector{
  float x,y,z;

  MyVector(){
    x=y=z=0.;
  }
  MyVector(float xin, float yin, float zin){
    x = xin;
    y = yin;
    z = zin;
  }
  MyVector buildVector( MyPoint vert2, MyPoint vert1){
    x = vert2.x-vert1.x;
    y = vert2.y-vert1.y;
    z = vert2.z-vert1.z;
    return this;
  }
  float dot(MyVector v1){
    return v1.x*x+v1.y*y+v1.z*z;
  }
  void cross(MyVector a){
    MyVector temp = new MyVector(0.,0.,0.);
    temp.x = a.y * z - a.z * y;
    temp.y = x * a.z - z * a.x;
    temp.z = a.x * y - a.y * x;
    x = temp.x;
    y = temp.y;
    z = temp.z;
  }

  void norm(){
    float t =  sqrt(x*x+y*y+z*z);
    x = x/t;
    y = y/t;
    z = z/t;
  }
  void print(){
    println("x:" + x);
    println("y:" + y);
    println("z:" + z);
  }
}