笔试题(using namespace std)
using namespace std;
class A
{
protected:
int m_data;
public:
A(int data = 0){m_data = data; }
int GetData(){return doGetData();}
virtual int doGetData(){ return m_data;}
};
class B:public A
{
protected:
int m_data;
public:
B(int data = 1){m_data = data; }
int doGetData(){ return m_data;}
};
class C:public B
{
protected:
int m_data;
public:
C(int data = 2){m_data = data; }
};
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