#include <stdio.h>
#include <mpi.h>
#include <unistd.h>

int main(int argc, char **argv )
 {
  int myid, numprocs;
  char hostname[80];
  MPI_Init(&argc, &argv);
  MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
  MPI_Comm_rank(MPI_COMM_WORLD, &myid); 
  if (gethostname(hostname, sizeof(hostname)))
   printf("ERROR: gethostname for id %d\n", myid);
  else
   printf("Hello from id %d running on %s\n", myid,hostname);
  MPI_Finalize();
  return(0);
 }