以下程序的输出结果为( ) #include class Base{ int i; public: Base(int I):i(I){} virtual int value() const { return i; } virtual int shift(int x)const{return i;} }; class Der :public Base{ public: Der(int I):Base(I){} int value() const { return Base::value()*2; } virtual int shift(int x) const { return Base::value()< } }; void main() { Base* B[]={new Base(7),new Der(7)}; cout< value()
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