# include <cstdlib>
# include <iostream>
# include "mpi.h"
using namespace std;


int main ( int argc, char *argv[] )
{
  int my_id;
  int num_procs;

  MPI::Init ( argc, argv );
  my_id = MPI::COMM_WORLD.Get_rank ( );

  if ( my_id == 0 ) 
  {
    num_procs = MPI::COMM_WORLD.Get_size ( );
    cout << "\n";
    cout << "HELLO_WORLD - Master process:\n";
    cout << "  A simple C++ program using MPI.\n";
    cout << "  The number of processes is " << num_procs << "\n";
  }
  else
  {
    cout << "  Process " << my_id << " says 'Hello, world!'\n";
  }

  MPI::Finalize ( );

  return 0;
}