#include <stdio.h>                                                                /* newPoint.c */
#include <stdlib.h>

typedef struct {double x, y; } Point;

Point * newPoint(double x, double y) {
  Point * r = malloc( sizeof( Point ) );
  if ( r == NULL )  fprintf(stderr, "newPoint: out of memory\n");
  else                     { r->x = x; r->y = y; }
  return r;
}

Point * addP(Point * p, Point * q)
{ return newPoint( p->x + q->x, p->y + q->y ); }

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