/*
*pointers.c
*/

/*
*Указатели
*/

#include<stdio.h>

int main()
{
	int a[3] = {10,20,30};

	int *p;

	p = a;

	printf("\
	           p = %p\n\
	          *p = %d\n\
	           a = %p\n\
	          *a = %d\n\n", p, *p, a, *a);

	printf("\
	        a[0] = %d\n\
	        a[1] = %d\n\
	        a[2] = %d\n\
	           p = %p\n\
	        a[0] = %d\n\
	       &a[0] = %p\n\
	          *p = %d\n\
	       &(*p) = %p\n\
	        a[0] = %d\n\
	      *(p+0) = %d\n\
	      *(p++) = %d\n\
	      *(++p) = %d\n\
	        *p++ = %d\n\
	          *p = %d\n", a[0], a[1], a[2], p=a, a[0], &a[0], *p, &(*p), a[0],\
	           *(p+0), *(p++), *(++p), *p++,*p);
	return 0;
}


g% clang-4.0 pointers.c 
pointers.c:39:43: warning: unsequenced modification and access to 'p' [-Wunsequenced]
                  *p = %d\n", a[0], a[1], a[2], p=a, a[0], &a[0], *p, &(*p), a[0],\
                                                 ^                 ~
1 warning generated.


g% ./a.out             
	           p = 0x7fffe583d708
	          *p = 10
	           a = 0x7fffe583d708
	          *a = 10

	        a[0] = 10
	        a[1] = 20
	        a[2] = 30
	           p = 0x7fffe583d708
	        a[0] = 10
	       &a[0] = 0x7fffe583d708
	          *p = 10 /*Верно*/
	       &(*p) = 0x7fffe583d708
	        a[0] = 10
	      *(p+0) = 10 /*Верно*/
	      *(p++) = 10 /*Верно*/
	      *(++p) = 30 /*Верно*/
	        *p++ = 30 /*Верно*/
	          *p = 538976265 /*"Мусор", верно*/



g% gcc -Wall -Wextra -Wformat pointers.c -o pointers -std=c11
pointers.c: In function ‘main’:
pointers.c:40:39: warning: operation on ‘p’ may be undefined [-Wsequence-point]
             *(p+0), *(p++), *(++p), *p++,*p);
                                       ^
pointers.c:40:39: warning: operation on ‘p’ may be undefined [-Wsequence-point]
pointers.c:40:39: warning: operation on ‘p’ may be undefined [-Wsequence-point]
pointers.c:40:39: warning: operation on ‘p’ may be undefined [-Wsequence-point]
pointers.c:40:39: warning: operation on ‘p’ may be undefined [-Wsequence-point]
pointers.c:40:39: warning: operation on ‘p’ may be undefined [-Wsequence-point]
pointers.c:40:39: warning: operation on ‘p’ may be undefined [-Wsequence-point]


g% ./pointers  
	           p = 0x7ffd1ef87d40
	          *p = 10
	           a = 0x7ffd1ef87d40
	          *a = 10

	        a[0] = 10
	        a[1] = 20
	        a[2] = 30
	           p = 0x7ffd1ef87d40
	        a[0] = 10
	       &a[0] = 0x7ffd1ef87d40
	          *p = 0  /*Не верно*/
	       &(*p) = 0x7ffd1ef87d40
	        a[0] = 10
	      *(p+0) = 0  /*Не верно*/
	      *(p++) = 30 /*Не верно*/
	      *(++p) = 30 /*С учетом предыдущего шага - не верно*/
	        *p++ = 10 /*С учетом предыдущего шага - не верно*/
	          *p = 10 /*С учетом предыдущего шага - не верно*/