#include <iostream> 
#include <string> 
using namespace std;   
class Teacher 
{ 
    public: 
    Teacher() 
    { 
        director = new char[10]; 
    } 

 
    char *show();  

    protected: 
    char *director; 
    //string *director; 
}; 
char *Teacher::show() 
{ 
    return director; 
} 
class Student 
{ 
    public: 
    Student() 
    { 
        number = 1; 
        score = 100; 
    } 
    void show(); 

 
    protected: 
    int number; 
    int score; 
    Teacher teacher; 

 
}; 

 
void Student::show() 
{ 
    cout<<teacher.show()<<endl<<number<<endl<<score<<endl; 
} 
void main() 
{ 
    Student a; 
    a.show(); 
    Student b[5]; 
    for(int i=0; i<sizeof(b)/sizeof(Student); i++) 
    { 
        b[i].show(); 
    } 
    cin.get(); 
}

teacher构造函数里面director应该是指向一个内存的首地址，为什么show（）函数返回的不是地址呢，

两个show()属于不同的类，功能可以不同啊！

director本身就是分配内存地址。如果你想打印这个地址，可以这么干：

class Teacher
{
    public:
    Teacher()
    {
        director = new char[100];
    }

    ~Teacher() //don't forget free memory of array ;
    {
        delete [] director;
    }
    char **show();

    protected:
    char *director;
    //string *director;
};
char **Teacher::show()
{
    return &director;
}

然后修改Student::show方法。
void Student::show()
{
    cout<< hex << teacher.show() <<endl << dec <<number<<endl<<score<<endl;
}

打印出来的就是地址值。