Child Object address variation

[smannari]

In the below code the output is 136.
const int z = (reinterpret_cast<char*>(pa) == reinterpret_cast<char*>(pb)) ? 5 : 6;
The above code is comparing address in pointer a and b, both have the address of object c.
When I checked it in gdb I could see that the address in

pa is 0x28fed0
pb is 0x28fed8
and I then checked &c
&c = 0x28fed0

How come the address in pb is different , please can anybody explain?

#include <iostream>

class A
{
public:
A() : m_i(0) { }

protected:
int m_i;
};

class B
{
public:
B() : m_d(0.0) { }

protected:
double m_d;
};

class C
: public A
, public B
{
public:
C() : m_c('a') { }

private:
char m_c;
};

int main()
{
C c;
A *pa = &c;
B *pb = &c;

const int x = (pa == &c) ? 1 : 2;
const int y = (pb == &c) ? 3 : 4;
const int z = (reinterpret_cast<char*>(pa) == reinterpret_cast<char*>(pb)) ? 5 : 6;

std::cout << x << y << z << std::endl;

return 0;
}