// Example program that uses the Particle class (Particle.cc) //


// Must include the header file for the particle class
// This header will declare to the program what the class contains and what it can do
#include "Particle.h" 

// Want to use the iostream functionality in the standard C++ library 
// This allows us to print messages using cout
#include <iostream>

// Namespace
using namespace std;

//-----------------------------------------------------------------------------------

//Executable function
int main() 
{

  double mass  = 0.938; //GeV (a proton)
  double mom  = 50 ; //GeV

  // now we create a Particle object which has these values
  // this will use the normal constructor defined in Particle.cc
    
  Particle p1(mass,mom);

  // and here is an example of how to use functions belonging to a class (its methods)
  cout<< "Particle 1: mass     = " << p1.GetMass()<<endl;
  cout<< "Particle 1: momentum = " << p1.GetMomentum()<<endl;
  cout<< "Particle 1: energy   = " << p1.GetEnergy()  << endl;

  // we can make another particle as a different object but using the same class
  // lets say it has the same mass but a different momentum.

  double mom2 = 25.0; 
  Particle p2(mass,mom2);

  cout <<"Particle 2: mass     = " << p2.GetMass()<<endl;
  cout<< "Particle 2: momentum = " << p2.GetMomentum()<<endl;
  cout<< "Particle 2: energy   = " << p2.GetEnergy() << endl;

  return 0;

}