Variable declaration and their memory addresses in C

I created a simple program:

#include <stdio.h>

int main()
{
    int s1;
    int s2;
    int s3;
    
    int *p1, *p2, *p3;
    
    p1 = &s1;
    p2 = &s2;
    p3 = &s3;
    
    printf("%d\n%d\n%d", p1, p2, p3);
}

Whenever I run this program, it prints the memory addresses of pointers p1, p2 and p3 and the interesting thing is that these values have differences of 12. I want to know the reason behind this. Why do the addresses differ by 12?

Note: This happens each time I execute the program.

Output:

I tested the same program in many type of variables , the results i gets are ..

When variables are char type.

When variables are long type

When i declare int array , size each array is 1.

When size of second declared array is 2 , it gets extra 4 byte offset.