#include "My3Vector.h" // My3Vector declarations
class MyLVector : public My3Vector { // inherit from My3Vector
  protected:        
    double t;
  public:  
    MyLVector();// The default constructor
    MyLVector(double c0, double c1, double c2, double c3);// Other constructor
    MyLVector(double c0, My3Vector p);// Other constructor
    // methods:
    double Mass();  //   get mass of 4-vector
    double Mass( MyLVector p);  //   get mass of two 4-vector
    void Print( );  // output
    MyLVector Add(MyLVector p);
    void setXYZT(double x, double y, double z, double t);
    void setXYZM(double x, double y, double z, double m);
    void setPtEtaPhiM(double pt, double eta, double phi, double m);

};