text: #include <mpi.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include "mpitest.h"
  
  int main(int argc, char **argv)
  {
      MPI_Group basegroup;
      MPI_Group g1;
      MPI_Comm comm, newcomm;
      int errs = 0, mpi_errno, rank, size;
      int i, errclass, nranks, *ranks;
      int worldrank;
  
      MTest_Init(&argc, &argv);
      MPI_Comm_rank(MPI_COMM_WORLD, &worldrank);
      comm = MPI_COMM_WORLD;
      MPI_Comm_group(comm, &basegroup);
      MPI_Comm_rank(comm, &rank);
      MPI_Comm_size(comm, &size);
      MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
  
      MPI_Comm_split(comm, 0, size - rank, &newcomm);
      MPI_Comm_group(newcomm, &g1);
      ranks = (int *) malloc(size * sizeof(int));
      for (i = 0; i < size; i++)
          ranks[i] = i;
      nranks = size;
  
      /*Checking group_ranslate_ranks for NULL variable */
      mpi_errno = MPI_Group_translate_ranks(g1, nranks, ranks, basegroup, NULL);
      MPI_Error_class(mpi_errno, &errclass);
      if (errclass != MPI_ERR_ARG)
          ++errs;
  
      MPI_Comm_free(&comm);
      MPI_Comm_free(&newcomm);
      MPI_Group_free(&basegroup);
      MPI_Group_free(&g1);
      MTest_Finalize(errs);
      return 0;
  }
  