32位系统中下面程序打印结果为（）
#include<iostream>
using namespace std;
class A
{
char a[3];
public:
virtual void fun1(){};
};
class B : public virtual A
{
char b[3];
public:
virtual void fun2(){};
};
class C : public virtual B
{
char c[3];
public:
virtual void fun3(){};
};
int main ()
{
cout << sizeof(A) << endl;
cout << sizeof(B) << endl;
cout << sizeof(C) << endl;
return 0;
} 
