/*  ex8-356-11.c */

#include <stdio.h>
#define RECTANGLE 1
#define CIRCLE 0

struct point {
   int x; int y;
   };

struct shape {
   int shape_kind;        /* RECTANGLE or CIRCLE */
   struct point center;   /* coordinate of center */
   union {
      struct {
          int length; int width;
      } rectangle;
      struct {
          int radius;
      } circle;
   } u;
} s;

main()
{
   s.shape_kind = RECTANGLE;
   printf("%d\n", s.shape_kind);

   s.center.x = 10;
   printf("%d\n",  s.center.x);
 
   s.u.rectangle.width = 8;
   printf("%d\n", s.u.rectangle.width );

   s.u.circle = 5;
   printf("%d\n", s.u.circle );

   s.u.radius = 5;
   printf("%d\n", s.u.radius );
 
   return 0;
}