빈 구조체에대한 처리에 대해서....

코드 -----------------------------------------------------------------------------
struct zero_struct
{
};

struct temp2
{
int a ;
struct zero_struct z1 ;
int b ;
struct zero_struct z2 ;
int c ;
};

int main()
{
struct temp2 temp2object ;
temp2object.a=10 ;
temp2object.b=20 ;
temp2object.c=30 ;

printf("%d\n", sizeof( temp2object) );
printf("a :%d\n", temp2object.a );
printf("z1:%d\n", temp2object.z1 );
printf("b :%d\n", temp2object.b );
printf("z2:%d\n", temp2object.z2);
printf("c :%d\n", temp2object.c );

printf("\n%x\n", &temp2object );
printf("offset(a) : %x\n", &(temp2object.a) );
printf("offset(z1): %x\n", &(temp2object.z1) );
printf("offset(b) : %x\n", &(temp2object.b) );
printf("offset(z2): %x\n", &(temp2object.z2) );
printf("offset(c) : %x\n", &(temp2object.c) );

return 0 ;
}
-----------------------------------------------------------------------------

결과 -----------------------------------------------------------------------
12
a :10
z1:10
b :20
z2:20
c :30
bffffb20
offset(a) : bffffb20
offset(z1): bffffb24
offset(b) : bffffb24
offset(z2): bffffb28
offset(c) : bffffb28

----------------------------------------------------------------------------

여기서 이상한점이 z1의 offset은 b와 같은데.... 값은 a가 찍힌다는겁니다.
어떻게 이런일이 가능할까요???? :oops: