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请根据程序的运行结果,完善以下代码。 #include using namespace std; class A { int x, y; public: { x = d; y = w; } virtual void disp() { cout<< x + y< } }; class B : public A { public: { cout<< x*y << endl; } }; void main() { A *ptr; ptr->setvalue(3,5); ptr->disp(); } 运行结果:15
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