#include <mpi.h>
#include <iostream>

int main(int argc, char **argv)
{
  int *buf, i, rank, nints, len;
  char hostname[256];
  
  MPI_Init(&argc,&argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  gethostname(hostname,255);
  std::cout << "Hello world!  I am process number: " << rank
            << " on host " << hostname << std::endl;
  MPI_Finalize();
  return 0;
}