#define INCL_DOSNLS   /* National Language Support values */
#include <os2.h>
#include <stdio.h>

ULONG  CountryCode = 001;
APIRET rc;                             /* Return code */

   rc = DosSetProcessCp( CountryCode );

   if (rc != 0)
     {
       printf("DosSetProcessCp error: return code = %ld",rc);
       return;
     }