Pointer explanation

pointers.c

#define ADDRESS_OF(var)  &(var)
#define VALUE_AT(var)    *(var)
#define POINTER_TO(type) type*

main()
{
    int foo[3] = {10,20,30};
    POINTER_TO(int) bar = ADDRESS_OF(foo);

    printf("address of foo    : 0x%8x\n",ADDRESS_OF(foo[0]));
    printf("address of foo + 1: 0x%8x\n",ADDRESS_OF(foo[1]));
    printf("address of foo + 2: 0x%8x\n",ADDRESS_OF(foo[2]));
    printf("Notice the distance between each address is %d. The total memory used by foo is %d\n",sizeof(int),sizeof(foo));
    printf("value at foo      : %d\n",VALUE_AT(foo));
    printf("value at foo + 1  : %d\n",VALUE_AT(foo + 1));
    printf("value at foo + 2  : %d\n",VALUE_AT(foo + 2));

    printf("\nbar holds the address of foo: 0x%8x\n",bar);
    printf("We can now directly access the data bar references\n");
    (VALUE_AT(bar))++;
    (VALUE_AT(bar + 1))++;
    (VALUE_AT(bar + 2))++;
    printf("value at foo      : %d\n",VALUE_AT(foo));
    printf("value at foo + 1  : %d\n",VALUE_AT(foo + 1));
    printf("value at foo + 2  : %d\n",VALUE_AT(foo + 2));
    return 0;
}