C++ 代码优化：继承和多态实例

#include using namespace std;

class AA { public: AA() { cout << 'Constructor of AA is called.' << endl; } virtual void fn() { cout << 'AA function is called.' << endl; } };

class BE : public AA { public: BE() { cout << 'Constructor of BB is called.' << endl; } void fun() { cout << 'BB function is called.' << endl; } };

int main() { BE b; b.fn(); b.fun(); return 0; }