摘要： 1 #include <iostream> 2 3 using namespace std; 4 5 class A 6 { 7 protected: 8 int m_data; 9 10 public:11 A(int data = 0)12 {13 m_data = data;14 }15 int GetData()16 {17 return doGetData();18 }19 20 virtual int doGetData()21 {22 return m_d... 阅读全文