##### 25.3.11.1 A Minimal Program Using Argp

This is perhaps the smallest program possible that uses argp. It won't do much except give an error messages and exit when there are any arguments, and prints a rather pointless message for ‘`--help`’.

         /* This is (probably) the smallest possible program that
            uses argp.  It won't do much except give an error
            messages and exit when there are any arguments, and print
            a (rather pointless) messages for --help. */

         #include <stdlib.h>
         #include <argp.h>

         int
         main (int argc, char **argv)
         {
           argp_parse (0, argc, argv, 0, 0, 0);
           exit (0);
         }