C++学习笔记（1）——基类、派生类的对象空间

观察下列程序中产生的两个对象的地址空间及其内容






/**//************************************************************************


* 基类和派生类例子


************************************************************************/




#include <IOSTREAM.H>


#include <CONIO.H>




//基类


class CMyBase




...{


int x;


public:




int SetX(int nValue)...{return x=nValue;}




int GetX()...{return x;}




void print()...{cout<<"in the base class : x = "<<x<<endl;}


};




//派生类


class CMyDerive:public CMyBase




...{


int x; //派生类中的成员变量隐藏基类的成员变量


public:




int SetX(int nValue)...{return x=nValue;}




int GetX()...{return x;}


//基类中的成员函数被重新定义




void print()...{cout<<"in the derive class : x = "<<x<<endl;}


};




main()




...{


CMyBase obj1;


obj1.SetX(1000);


obj1.print();


cout<<"in main function, in the base class : x = "<<obj1.GetX()<<endl;


cout<<endl;




CMyDerive obj2;


obj2.SetX(300);


obj2.print();


obj2.CMyBase::print();


cout<<"in main function, in the derived class : x = "<<obj2.GetX()<<endl;


cout<<"in main function, in the base class : x = "<<obj2.CMyBase::GetX()<<endl;




obj2.CMyBase::SetX(200);


obj2.print();


obj2.CMyBase::print();


cout<<"in main function, in the derived class : x = "<<obj2.GetX()<<endl;


cout<<"in main function, in the base class : x = "<<obj2.CMyBase::GetX()<<endl;




return 0;


}



1．基类和派生类的对象的值








2．基类和派生类的成员函数的地址








3．基类和派生类的对象的地址及其成员变量的地址