/* p21.c */

#include <malloc.h>

struct pix_type
{
   unsigned char r;
   unsigned char g;
   unsigned char b;
}

main()
{
   struct pix_type* pixptr;

   pixptr = (struct pix_type *)malloc(sizeof(struct pix_type));

  (*pixptr).r = 250;
   pixptr->b = 10;

}