Обьяснить каждую строку выводящуюся на экран

#include "stdio.h"

#include "math.h"

main()

{

struct str {int x; int y};

	int *p1, *p2, *p;

	struct str s;

	int a[5]={1,2,3,4,5};

	

	printf("p1=%p\n", p1);

	

	printf("p2=%p\n",p2);

	

	printf ("Start\n");

	

	p1=&a[1%5+1];

	printf("p1=%p *p2=%i\n", p2, *p2);

	

	p=&s.x;

	s.x=*p1;

	printf("s.x=%i &s.x=%p\n", s.x, p);

	

	s.y=*p2++;

	printf ("s.y=%i *p2++=%i\n", s.y, *p2++);

	

	printf ("1st *(p1-2)=%i", *(p1-2));

	

	*(p1-2)=s.y;

	printf(" 2nd *(p1-2)=%i\n", *(p1-2));

	

	p2=&s;

	printf ("p2=%p\n", p2);

	

	((struct str*)p2)->x=p1[1];

	printf ("p2->x=%i\n", ((struct str*)p2)->x);

	

	((struct str*)p2)->y=s.y;

	printf("p2->y=%i\n", ((struct str*)p2)->y);

	

	a[5]=s.x;

	printf ("a[5]=%i\n", a[5]);

}