/*
  "hello world" program
*/

#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>		/* MPI header file */

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

  int nprocs;
  int myid;

  /* initialize for MPI (should come before any other calls to
     MPI routines)
  */
  if (MPI_Init(&argc, &argv) != MPI_SUCCESS) {
    fprintf(stderr, "MPI initialization error\n"); exit(EXIT_FAILURE);
  }

  /* get number of processes
     (function returns success/error, but we ignore it)
  */
  MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

  /* get this process's number (ranges from 0 to nprocs - 1)
     (function returns success/error, but we ignore it)
  */
  MPI_Comm_rank(MPI_COMM_WORLD, &myid);

  /* print a greeting */
  printf("hello from process %d of %d\n", myid, nprocs);

  /* clean up for MPI (should come after all other calls to
     MPI routines)
     (function returns success/error, but we ignore it)
  */
  MPI_Finalize();

  return EXIT_SUCCESS;
}