virtual void func(int num){cout << "base: " << num << endl;}

　　};

　　class derived : public base

　　{

　　public:

　　void func(const char* str){cout << "derived: " << str << endl;}

　　void func(int num){cout << "derived: " << num << endl;}

　　void func(){cout << "the function is in derived!" << endl;}

　　};

　　int main()

　　{

　　base *pb;

　　derived objd;

　　pb = objd;

　　pb->func(11);

　　pb->func("hello");

　　// pb->func();

　　getchar();

　　return 0;

　　}