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

struct point {
	int x;
	int y; 
};

struct rect {
       struct point pt1;
       struct point pt2;
   };

struct rect rects[10];


//struct rect {
//       struct point pt1;
//       struct point pt2;
//   } rects[10];



typedef int Length;


typedef struct Books {
   char title[50];
   char author[50];
   char subject[100];
   int book_id;
} Book;

Book variable;


//struct { ... } x, y, z;

//int x, y, z;

union Data {
   int i;
   float f;
   char str[20];
};


int main(){
	
	struct point pt, p2, p3;
	
	struct point maxpt = { 320, 200 };
	printf("%d, %d\n", maxpt.x, maxpt.y);

	pt.x = 320;
	pt.y = 200;
	printf("%d, %d\n", pt.x, pt.y);

        struct point *pp = malloc(sizeof(struct point));
	pp->x = 9;
	pp->y = 8;
	printf("%d, %d\n",(*pp).x,(*pp).y);
	free(pp);

	struct point origin;
	struct point *po;
	po = &origin;
	po->x = 19;
        po->y = 18;
        printf("%d, %d\n", po->x, po->y);
	printf("%d, %d\n", origin.x, origin.y);

	struct rect screen;
	screen.pt1.x = 9;
	screen.pt1.y = 8;

	
	struct rect *rp;
	struct rect r;
	rp = &r;

	r.pt1.x = 50;
	
	//Las siguientes 4 expresiones son análogas
	//r.pt1.x
	//rp->pt1.x
	//(r.pt1).x
	//(rp->pt1).x


	printf("%d\n",r.pt1.x);
	printf("%d\n",rp->pt1.x);
	printf("%d\n",(r.pt1).x);
	printf("%d\n",(rp->pt1).x);


	union Data data;

	data.i = 10;
	printf( "data.i : %d\n", data.i);
	data.f = 220.5;
	printf( "data.f : %f\n", data.f);
	strcpy( data.str, "C Programming");

   	printf( "data.i : %d\n", data.i);
   	printf( "data.f : %f\n", data.f);
   	printf( "data.str : %s\n", data.str);
}