#include<iostream>
using namespace std;
class A
{
public:
static int count;//类中声明
A()
{
count ++;
}
int get_count()
{
return count;
}
};
int A::count=0;//类外定义
class B:public A
{
};
int main()
{
B b1,b2,b3,b4;
cout<<b1.get_count()<<endl;
cout<<b4.get_count()<<endl;
cout<<A::count<<endl;
return 0;
}