include iostream using namespace std struct virtual void AA cout AA en

#include <iostream>

using namespace std;

struct a
{
 virtual void AA() { cout << "AA" << endl; }
};

struct b : a
{
 void AA() { cout << "BB" << endl; }
};

int main()
{
 a* A = new b();
 A->AA();
 return 0;
}