5、继承简单

/*
 * 保护继承
 * 从基类学生公有派生研究生类
 */

#include <iostream>
#include <string.h>
using namespace std;

class Student
{
private:
   char *name;
   int No;
public:
   Student(char *nstr="", int n=0)
   {
      name = new char[strlen(nstr)+1];
      strcpy(name, nstr);
      No = n;
   }
   ~Student(){delete[] name;}
   char * getname(){return name;}
   int getNo(){return No;}
};

class GraduateStudent : public Student //改成protected
{
private:
   char *instructor;
public:
   GraduateStudent(char *nstr="", int n=0, char *dstr=""):Student(nstr,n)
   {
      instructor = new char[strlen(dstr)+1];
      strcpy(instructor, dstr);
   }
   ~GraduateStudent(){delete[] instructor;}
   char *getInstructor(){return instructor;}
   //int getNo(){return Student::getNo();}
   //char *getname(){return Student::getname();}
};

int main(void)
{
   GraduateStudent zhang("zhangsan", 1001,"lisi");
   cout<<"姓名："<<zhang.getname()<<"\t"
      <<"学号："<<zhang.getNo()<<"\t"
      <<"导师："<<zhang.getInstructor()<<endl;
   cout<<endl;
   return 0;
}