/* 范例：17-3 */
#include <iostream.h>
class A
{
  public:
    A(){a=1;b=2;c=3;} 	// 默認(rèn)初值a=1;b=2;c=3;
    int a;
  protected:
    int b;
  private:
    int c;
};
class B:public A
{
  public:
    B(){a=4;} 	// 默認(rèn)初值a=4;
    void pp(){cout << a << "\n";}	/* 哪個(gè)a ?? (此為class B的private成員a) */
  private:
    int a;
};
void main()
{
  B obj1;

  cout << sizeof(A) << " " << sizeof(B) << "\n";
//  cout << obj1.a << "\n"; 	// error 無法存取!!
/* 因?yàn)榇嫒〉絚lass B的private成員a */
  cout << obj1.A::a << "\n";
  obj1.pp();
  getchar();
}
程序執(zhí)行結(jié)果：
12 16
1
4