Thread: memory address calculations

hi again,
I'm a little bit confused. How do we calculate memory address differences? Does it matter if it's from int or double type variable? Eventually, they are same type of numbers?
If I give an example like this?

Code:

#include <stdio.h>

main() {
    int a=16, b=22;
    int diff_1, diff_2, diff_3, diff_4;
    double c=10.0, d=234.52;
    printf("\nAddress of  a = %u  ",&a);
    printf("Value of a      = %i  ",a);
    printf("\nAddress of  b = %u  ",&b);
    printf("Value of b      = %i  ",b);
    printf("\nAddress of  c = %u  ",&c);
    printf("Value of c      = %f ",c);
    printf("\nAddress of  d = %u  ",&d);
    printf("Value of d      = %f ",d);

    printf("\n\n");
    diff_1 = &a-&b;
    diff_2 = &b-&c;
    diff_3 = &c-&d;
    diff_4 = &a-&d;

    printf("\nAddress difference a-b = %u", diff_1);
    printf("\nAddress difference b-c = %u", diff_2);
    printf("\nAddress difference c-d = %u", diff_3);
    printf("\nAddress difference a-d = %u", diff_4);
    return 0;
}

Thanks.