有如下程序：

#include

using namespace std;

class A

{

public:

A．(){cout<<"A";}

~A(){cout<<"~A";}

};

class B:public A

{

A．* p;

public:

B．(){cout<<"B"; p = new A();}

~B(){cout<<"~B"; delete p;}

};

int main()

{

B． obj;

return 0;

}

执行这个程序的输出结果是

A． ． BAA~A~B~A

B． ． ABA~B~A~A

C． ． BAA~B~A~A

D． ． ABA~A~B~A

[单选题]有如下程序：#includeusing namespace std;class Base{private:void funl() const{cout<<"funl";}protected:void fun2() const{cout<<"fun2";}public:void fun3() const{cout<<"fun3";}};class Derived:protected Base{public:void fun4() const{cout

[单选题]有如下程序：#includeusing namespace std;class Complex{double re, im;public:C．omplex(double r, double i):re(r), im(i){}double real() const{return re;}double image() const{return im;}C．omplex& operator +=(Complex a){re += a.re;im += a.im;return *this;}};

[单选题]有如下程序：#includeusing namespace std;class Base{public:void funl(){cout<<"Base/n";}virtual void fun2(){cout<<"Base/n";}};class Derived:public Base{public:void funl(){cout<<"Derived/n";}void fun2(){cout<<"Derived/n";}};voi

[试题]有如下程序：#includeusing namespace std;class Con{char ID;public:C．on():ID('A'){cout<<1;}C．on(char ID． ． :ID(ID． ． {cout<<2;}C．on(Con&C． ． :ID(c.getID()){cout<<3;}char getID() const{return ID;}};void show(ConC． ． {cout<int main(){

[试题]有如下程序：#includeusing namespace std;class PARENT{public:PARENT(){cout<<"PARENT";}};class SON:public PARENT{public:SON(){cout<<"SON";}};int main(){SON son;PARENT *p;p = &son;return 0;}执行上面程序的输出是 ( 12 ) 。

[试题]有如下程序：#includeusing namespace std;class ONE{public:virtual void f(){cout<<"l";}};class TWO:public ONE{public:TWO(){cout<<"2";}};class THREE:public TWO{public:virtual void f(){TWO::f(); cout<<"3";}};int main(){ONE aa, *p;TWO bb;

[单选题]有如下程序:includeusing namespace std;Class A{public:A(){cout<<“A”;}~A(){cout<<有如下程序： #include＜iostream＞ using namespace std； Class A { public： A(){cout＜＜“A”；} ～A(){cout＜＜“～A”；} }； A*p； public： B(){cout＜＜“B”；p＝new A；} ～B(){cout＜＜“～B”；delete p；} }； B obj；

[单选题]有如下程序:includeusing namespace std;class Con{char ID;public:Con():ID('A'){co有如下程序： #include＜iostream＞ using namespace std； class Con { char ID； public： Con()：ID('A'){cout＜＜1;} Con(char ID)：ID(ID'){cout＜＜2；} Con(Con&c)：ID(c.getID()){cout＜＜3；} c

[单选题]有如下程序:includeusing namespace std;Class Test{public:Test(){n£«=2;}~Test(){n£­有如下程序： #include＜iostream＞ using namespace std； Class Test { public： Test() {n+＝2；} ～Test() {n-＝3；} static int getNum() {return n；} private： static int n； }； int Test：：n＝1； in

[单选题]有如下程序:includeusing namespace std;Class TestClass{private:int x,y;public:Te有如下程序： #include＜iostream＞ using namespace std； Class TestClass { private： int x，y； public： TestClass(int i，int j) { x＝i; y＝j； } void print() { cout＜＜“print1”＜＜endl； } void prin