visual+C++练习题(3)

{ test obj1;

test obj2(59); obj1.display(); obj2.display(); }

24. 写出下列程序的运行结果 #include using namespace std; class Count { public:

Count() { count++;}

static int getn() {return count;} ~Count() { count--; } private: static int count; };

int Count::count=100; void main()

{ Count c1,c2,c3,c4; cout<

25. 写出下列程序的运行结果 #include using namespace std; class base { public:

void show() {cout<<\};

class derived: public base

{ public:

void show() {cout<<\};

void main() {base demo1; derived demo2; demo1.show(); demo2.show();

demo2.base::show();

}

26. 分析下列程序的输出结果。 #include using namespace std; class A{

public:

A() { cout<<\

virtual ~A() { cout<<\virtual void f() { cout<<\void g() { f(); } };

class B : public A{

public:

B() { f(); cout<<\~B() { cout<<\};

class C : public B{

public:

C() { cout<<\~C() { cout<<\void f() { cout<<\};

void main() { A *a=new C; a->g(); delete a;

}

27. 写出下列程序的运行结果。 #include using namespace std; class Rect {public:

Rect(int l,int w) { length=l; width=w; }

void Print() { cout<<\private: int length,width; }; void main() { Rect *p; p=new Rect(5,4); p->Print(); delete p; }