Thread: Need Help Understand Pointers in C

Hello, New Member here !! I have just started Learning C after a long time and Started Pointers in C. I have some doubts in P+1 (Pointers arithmetic's) below i have given a example code

Code:

#include <stdio.h>

int main () 
{
    int  a = 10;   /* normal variable declaration */
    int  *p;        /* pointer variable declaration */
    p = &a;  /* store address of ‘a’ in pointer variable*/
    printf("Value of a variable: %d\n", a  );
    printf("Address of &a variable: %d\n", &a  );
    printf("\n");

    printf("Address stored in p : %d\n",p );
    printf("Value of *p: %d\n", *p );     
    printf("Address of &p variable: %d\n ", &p );
    printf("\n");

    printf("Address stored in p+1 variable: %d\n ", p+1);
    printf("Address of &p+1 variable: %d\n ", &p+1 );
    printf("value of *(p+1) variable: %d\n", *(p+1));
    printf("value of *p+1 variable: %d\n", *p+1);
    printf("\n");

    printf("Address stored in p+2 variable: %d\n ", p+2);
    printf("Address of &p+2 variable: %d\n ", &p+2);
    printf("value of *(p+2) variable: %d\n", *(p+2));
    printf("value of *p+2 variable: %d\n", *p+2);
     return 0;
}

OUTPUT :-

Code:

~/Workspace/C$ ./ pointers 
Value of a variable: 10
Address of &a variable: 1116119516

Address stored in p : 1116119516
Value of *p: 10
Address of &p : 1116119520
 
Address stored in p+1 variable: 1116119520
Address of &p+1 variable: 1116119528
value of *(p+1) variable: 1116119516
value of *p+1 variable: 11

Address stored in p+2 variable: 1116119524
Address of &p+2 variable: 1116119536
value of *(p+2) variable: 32765
value of *p+2 variable: 12

Attachment 16315

my doubt is, why Address of p (&p) and Address stored in p+1 is same. i know that by P+1 means is moving 4 bytes from the given address for integer which is p = 1116119516 + 4 --> P+1 = 1116119520, But &p is in 1116119520 before declaring P+1 which also gets 1116119520 as address. if both has same address wont there be some conflict in memory between those two if &p is called again.

doubt 2, Why is Address stored in p: 1116119516 and value of *(p+1) variable: 1116119516 is same. is't *(p+1) suppose to get some garbage value because its doesn't have a variable declared.

i don't understand this,
if made some mistake in explaining things forgive me and help clear my stupid doubt