class D: public B
{
public: void vf() { cout << "This is class D" << endl; }
};
main()
{
D d, *pd;
}
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这个程序错在哪里
#include using namespace std; class B { public: void virtual vf(); }; class D: public B { public: void vf() { cout << "This is class D" << endl; } }; main() { D d, *pd; }