Which is used pointer in c program?

Question

#include <stdio.h>

int main() {
int a[5] = {22, 33, 44, 55, 66};
int *ptr = NULL;

ptr = a; /* point to the first array element */
printf("%d %x\n", *ptr, ptr); /* 22 */
ptr++;
printf("%d %x\n", *ptr, ptr); /* 33 */
ptr += 3;
printf("%d %x\n", *ptr, ptr); /* 66 */
ptr--;
printf("%d %x\n", *ptr, ptr); /* 55 */
ptr -= 2;
printf("%d %x\n", *ptr, ptr); /* 33 */
}

Answer 1

You created ptr pointer and value is null printf statement you printing value *(ptr +0 ) which represent first index of array so 22 will print and %x use for hex values and ptr printing address in hex form .
After that ptr++ which increse the index same 33 will print and ptr for address
....
44
...
66 and address.
Hope you understood

Answer 2

I dont understand the question. Code seems to work as it should.