第十二周任务1

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程序的版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 作者：于晓峰
* 完成日期： 2012年 5月9日
* 版本号： v1.2

#include<iostream>#include<string>using namespace std;class Student //（1）修改student类中各数据成员和成员函数的访问限定符，并观察发生的现象{public: Student(int n,string nam,char s) ;void show();~Student( ){ }  protected: int num;string name;char sex ; };class Student1: public Student //（2）修改此处的继承方式，并观察发生的现象{ public: Student1(int n,string nam,char s,int a,string ad);void show1( );~Student1( ){ }  private: int age; string addr; };Student::Student(int n,string nam,char s) {num=n;name=nam;sex=s; }void Student::show(){cout<<"num: "<<num<<endl;cout<<"name: "<<name<<endl;cout<<"sex: "<<sex<<endl<<endl;}Student1::Student1(int n,string nam,char s,int a,string ad):Student(n,nam,s) {age=a; addr=ad;}void Student1::show1( ){cout<<"num: "<<num<<endl;cout<<"name: "<<name<<endl;cout<<"sex: "<<sex<<endl;cout<<"age: "<<age<<endl;cout<<"address: "<<addr<<endl<<endl;}int main( ){Student1 stud1(10010,"Wang-li",'f',19,"115 Beijing Road,Shanghai");Student1 stud2(10011,"Zhang-fun",'m',21,"213 Shanghai Road,Beijing");Student stud3(20010,"He-xin",'m');stud1.show1( ); stud2.show( ); stud3.show( ); return 0;}

#include<iostream>#include<string>using namespace std;class Student //（1）修改student类中各数据成员和成员函数的访问限定符，并观察发生的现象{public: Student(int n,string nam,char s) ;void show();~Student( ){ } private: int num;string name;char sex ; };class Student1: public Student //（2）修改此处的继承方式，并观察发生的现象{ public: Student1(int n,string nam,char s,int a,string ad);void show1( );~Student1( ){ }  private: int age; string addr; };Student::Student(int n,string nam,char s) {num=n;name=nam;sex=s; }void Student::show(){cout<<"num: "<<num<<endl;cout<<"name: "<<name<<endl;cout<<"sex: "<<sex<<endl<<endl;}Student1::Student1(int n,string nam,char s,int a,string ad):Student(n,nam,s) {age=a; addr=ad;}void Student1::show1( ){cout<<"age: "<<age<<endl;cout<<"address: "<<addr<<endl<<endl;}int main( ){Student1 stud1(10010,"Wang-li",'f',19,"115 Beijing Road,Shanghai");Student1 stud2(10011,"Zhang-fun",'m',21,"213 Shanghai Road,Beijing");Student stud3(20010,"He-xin",'m');stud1.show1( ); stud2.show( ); stud3.show( ); return 0;}

#include<iostream>#include<string>using namespace std;class Student //（1）修改student类中各数据成员和成员函数的访问限定符，并观察发生的现象{public: Student(int n,string nam,char s) ;void show();~Student( ){ }  protected: int num;string name;char sex ; };class Student1: private Student //（2）修改此处的继承方式，并观察发生的现象{ public: Student1(int n,string nam,char s,int a,string ad);void show1( );~Student1( ){ }  private: int age; string addr; };Student::Student(int n,string nam,char s) {num=n;name=nam;sex=s; }void Student::show(){cout<<"num: "<<num<<endl;cout<<"name: "<<name<<endl;cout<<"sex: "<<sex<<endl<<endl;}Student1::Student1(int n,string nam,char s,int a,string ad):Student(n,nam,s) {age=a; addr=ad;}void Student1::show1( ){cout<<"num: "<<num<<endl;cout<<"name: "<<name<<endl;cout<<"sex: "<<sex<<endl;cout<<"age: "<<age<<endl;cout<<"address: "<<addr<<endl<<endl;}int main( ){Student1 stud1(10010,"Wang-li",'f',19,"115 Beijing Road,Shanghai");Student1 stud2(10011,"Zhang-fun",'m',21,"213 Shanghai Road,Beijing");Student stud3(20010,"He-xin",'m');stud1.show1( ); stud2.show1( ); stud3.show( ); return 0;}

1.保护继承就是把基类原有的公用成员与保护起来，不让类外任意访问 2.私有继承就是将原来能被外界引用的成员隐藏起来，不让外界应用 .3.公用的访问属性，派生类内和派生类外都可以访问，受保护的，派生类内可以访问，派生类外不能访问私有的，派生类内可以访问，派生类外都不能访问不可访问的，派生类内外都不能访问