#include <stdio.h>                                                                /* locvar.c */

typedef struct {double x, y; } Point;

Point * addP(const Point * p, const Point * q) {
  Point r;
  r.x = p->x + q->x;   r.y = p->y + q->y;
  return &r;
}

int main() {
  Point p1 = {2.0, 3.5}, p2 = {7.1, 6.3};
  Point * pp = addP(&p1, &p2);
  printf("Addition finished!\n");
  printf("*pp=(%f,%f)\n", pp->x, pp->y);
  return 0;
}