试题与答案

有如下程序： #include ＜iostream＞ using namespa

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题型：填空题

题目：

有如下程序：
#include ＜iostream＞
using namespace std;
class AA

public:
virtual void f()

cout ＜＜ "AA";

;
class BB : public AA

public:
BB()

cout＜＜"BB";

;
class CC : public BB

public:
virtual void f()

BB::f();
cout ＜＜ "CC";

;
int main()

AA aa,*p; BB bb; CC cc;
p=&cc;
p-＞f();
return O;

运行后的输出结果 【14】

答案：

参考答案：BBBBAACC

解析： 本题中，函数f()在基类AA中派生类CC中都声明为虚函数，所以采用动态联编。主函数首先定义类AA的对象aa和指针对象p，然后定义了类BB的对象bb，此时调用了类BB的构造函数输出BB。再定义类CC的对象 cc，由于类CC是类BB的派生类，所以此时又调用类BB的构造函数输出BB。最后执行语句“p=&cc；p-＞f()；”，输出AA和CC。

考点：计算机等级考试C++二级C++笔试
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