程序题

1.What's the output of the following code?(MS_2013_Intern_2)

class A
{
public:
    virtual void f()
    {
        cout<<"A::f()"<<endl;
    }
    void f() const
    {
        cout<<"A::f() const"<<endl;
    }
};

class B: public A
{
public:
    void f()
    {
        cout<<"B::f()"<<endl;
    }
    void f() const
    {
        cout<<"B::f() const"<<endl;
    }
};

void g(const A* a)
{
    a->f();
}

int main()
{
    A* a = new B();
    a->f();
    g(a);
    delete a ;
}

答案： B::f() A::f() const

2.What's the output of the following code?(MS_2013_Intern_8)

 1 #include <iostream>
 2 
 3 class A{
 4 public:
 5     long a;
 6 };
 7 
 8 class B : public A
 9 {
10 public:
11     long b;
12 };
13 
14 void seta(A* data, int idx)
15 {
16     data[idx].a = 2;
17 }
18 
19 int _tmain(int argc, _TCHAR *argv[])
20 {
21     B data[4];
22 
23     for(int i=0; i<4; ++i)
24     {
25         data[i].a = 1;
26         data[i].b = 1;
27         seta(data, i);
28     }
29 
30     for(int i=0; i<4; ++i)
31     {
32         std::cout<<data[i].a<<data[i].b;
33     }
34 
35     return 0;
36 }

答案：22221111

posted @ 2013-08-13 16:47  虫不知  阅读(70)  评论(0)    收藏  举报