#include "hdf.h"

#define  FILE_NAME    "Two_Vgroups.hdf"

int main()
{
   /************************* Variable declaration **************************/

   intn  status_n;      /* returned status for functions returning an intn  */
   int32 status_32,     /* returned status for functions returning an int32 */
         vgroup_ref = -1,
         vgroup1_id, vgroup2_id, file_id;

   /********************** End of variable declaration **********************/

   /*
   * Create the HDF file.
   */
   file_id = Hopen (FILE_NAME, DFACC_CREATE, 0);

   /*
   * Initialize the V interface.
   */
   status_n = Vstart (file_id);

   /*
   * Create the first vgroup.  Note that the vgroup reference number is set
   * to -1 for creating and the access mode is "w" for writing.
   */
   vgroup1_id = Vattach (file_id, vgroup_ref, "w");

   /*
   * Create the second vgroup. 
   */
   vgroup2_id = Vattach (file_id, vgroup_ref, "w");

   /*
   * Any operations on the vgroups.
   */

   /*
   * Terminate access to the first vgroup.
   */
   status_32 = Vdetach (vgroup1_id);

   /*
   * Terminate access to the second vgroup.
   */
   status_32 = Vdetach (vgroup2_id);

   /*
   * Terminate access to the V interface and close the HDF file.
   */
   status_n = Vend (file_id);
   status_n = Hclose (file_id);
   return 0;
}