#include <stdio.h>
#include <stdlib.h>

typedef struct point {
  int x, y;
} Point, *PointPtr;

typedef struct {
  int x, y;
} PointV2, *PointV2Ptr;

struct pointv3 {
  int x, y;
};

int main(int argc, char **argv) {
  Point p1 = {.x = 5, .y = 4};
  PointPtr p1_ptr = &p1;

  printf("x: %d y: %d\n", p1.x, p1.y);
  p1.x = -5;
  p1_ptr->y = -4;
  printf("x: %d y: %d\n",p1.x, p1.y);

  PointV2 p2 = {.x = 22, .y = 33};
  PointV2Ptr p2_ptr = &p2;

  printf("x: %d y: %d\n",p2.x, p2.y);
  p2.x = -22;
  p2_ptr->y = -33;
  printf("x: %d y: %d\n",p2.x, p2.y);

  struct pointv3 p3 = {.x = 1, .y = 2};
  struct pointv3 *p3_ptr = &p3;

  printf("x: %d y: %d\n",p3.x, p3.y);
  p3.x = -1;
  p3_ptr->y = -2;
  printf("x: %d y: %d\n",p3.x, p3.y);
}