#include<iostream>
using namespace std;
class B{
public:
virtual void show(){cout<<"B";}
};
class D:public B{
public:
void show() {cout<<"D";}
};
void fun1(B *ptr){ptr->show();}
void fun2(B &ref){ref.show();}
void fun3(B b){b.show();}
int main(){
B. b,*p=new D;
D. d;
fun1(p);
fun2(b);
fun3(d);
return 0;
}
程序的输出结果是
A. ) BBB
B. ) BBD
C. ) DBB
D. ) DBD
[单选题]( 35 )有如下程序:#include <iostream>using namespace std;C.lass B{public:B.(int xx):x(xx) {++cout; x+=10;}virtual void show() const{cout<<count<< ' _ ' <<x<<endl;}protected:static int count;private:int x;};class D:public B{p
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