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);
    }
  }