typedef struct {                                                       /* point1.c */
  double x;
  double y;
 } Point;
#include <stdio.h>
int main() {
  Point p = {3.0, 4.0};                            /* structure initialisation */
  Point q;
  printf("p = (%f, %f)\n", p.x, p.y);        /* structure access (reading) */
  q = p;                                                  /* structure assignment */
  q.x += 2.5;                                           /* structure access (writing) */
  printf("q = (%f, %f)\n", q.x, q.y);
  return 0;
}