17-2.txt

《C/C++完美演绎》源代码

/* 范例：17-2 */
#include <iostream.h>
class A
{
  public:
    void show_addr();
    int a;
    static int g;
  protected:
    int b;
  private:
    int c;
};
int A::g; 	// 必须声明在外
void A::show_addr()
{
  cout << "&a=" << &a << "\n";
  cout << "&b=" << &b << "\n";
  cout << "&c=" << &c << "\n";
  cout << "&g=" << &g << "\n";
}
class B:public A  	// 试改protected,private方式继承
{
  public:
    int d;
    void get_super();
};
void B::get_super()
{
  show_addr();
  cout << "&d=" << &d << "\n";
}
void main()
{
  B obj1,obj2;
  cout << sizeof(A) << " " << sizeof(B) << "\n";
  cout << "&obj1=" << &obj1 << "\n";
  obj1.get_super();
  cout << "\n";
  cout << "&obj2=" << &obj2 << "\n";
  obj2.get_super();

  cout << &A::g << " " << &B::g << "\n";  // A::g,B::g地址
  getchar();
}

程序执行结果：
12 16
&obj1=0065FDF4
&a=0065FDF4
&b=0065FDF8
&c=0065FDFC
&g=00422034
&d=0065FE00

&obj2=0065FDE4
&a=0065FDE4
&b=0065FDE8
&c=0065FDEC
&g=00422034
&d=0065FDF0
00422034 00422034