C++之多继承

#include <iostream>

using namespace std ;

class AA
{
public:
int a ;
void Say_hello(void)
{
cout << "this is AA " << endl ;
}
};

class BB
{
public:
int b ;
void Say_hello(void)
{
cout << "this is BB " << endl ;
}
};

//多继承
class CC  : public AA , public BB
{
public:
int d ;
void Say_hello(void)
{
cout << "this is CC " << endl ;
}
};

int main(void)
{
CC  aa ;
aa.Say_hello();
aa.AA::Say_hello();
aa.BB::Say_hello();
aa.CC::Say_hello();

cout << "Size AA : " << sizeof(AA) << endl ;
cout << "Size BB : " << sizeof(BB) << endl ;
cout << "Size CC : " << sizeof(CC) << endl ;

}