public Vector addition(Program b)
{
Vector res = new Vector();
res.x = x + b.x;
res.y = y + b.y;
res.z = z + b.z;
return res;
}
public Vector VectorProduct(Program a, Program b)
{
Vector res = new Vector();
res.x = a.y * b.z - a.z * b.y;
res.y = a.x * b.z - a.z * b.x;
res.z = a.x * b.y - a.y * b.x;
return res;
}