( 35 )有如下程序:#include iostreamusing namespace std;Class B{public:B(int xx):x(xx) {++cout; x+=10;}virtual void show() const{coutcount ' _ ' xendl;}protected:static int count;private:int x;};class D:public B{public:D(int xx,int yy):B(xx),y(yy) {++count; y+=100;}virtual void show() const{coutcount ' _ ' yendl;}private:int y;};int B::count=0;int main(){B *ptr=new D(10,20);ptr-show();delete ptr;return 0;}运行时的输出结果是A ) 1_120B ) 2_120C ) 1_20D ) 2_20

( 35 )有如下程序:

#include <iostream>

using namespace std;

Class 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{

public:

D(int xx,int yy):B(xx),y(yy) {++count; y+=100;}

virtual void show() const

{cout<<count<< ' _ ' <<y<<endl;}

private:

int y;

};

int B::count=0;

int main(){

B *ptr=new D(10,20);

ptr->show();

delete ptr;

return 0;

}

运行时的输出结果是

A ) 1_120

B ) 2_120

C ) 1_20

D ) 2_20


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