内存问题

#include <stdio.h>
typedef unsigned short WORD;
typedef unsigned long DWORD;

class A
{
 WORD m_a1;
 WORD m_a2;
public:
 A(){ m_a1=1; m_a2=2; }
 void func(){ printf("m_a1=%d,m_a2=%d" , m_a1 , m_a2); }
};

class B
{
 DWORD m_b1;
public:
 B(){ m_b1=3; }
 void func(){ printf("m_b1=%d/n" , m_b1); }
};

void main()
{
 A a;
 B *pB;
 pB = (B*)&a;
 pB->func();
}