谭浩强版C++实例 第五章 继承与派生（10个）
//访问公有基类的成员
#include
#include
using namespace std;
class Student
{
private:
int num;
string name;
char sex;
public:
void get_value()
{
cin>>num>>name>>sex;
}
void display()
{
cout<<"num:"< cout<<"name:"< cout<<"sex:"< } }; class Student1:public Student { private: int age; string addr; public: Student1() { age=0; addr="beijing"; } void display1() { cout<<"age:"< cout<<"address:"< } }; int main() { Student1 stud; stud.get_value(); stud.display(); stud.display1(); return 0; } //5.2访问私有基类的成员 #include #include using namespace std; class Student { private: int num; string name; char sex; public: void get_value() { cin>>num>>name>>sex; } void display() { cout<<"num:"< cout<<"name:"< cout<<"sex:"< } }; class Student1:private Student { private: int age; string addr; public: Student1() { age=0; addr="beijing"; } void display1() { cout<<"age:"< cout<<"address:"< } }; int main() { Student1 stud; //stud.get_value();//私有继承；这样引用是错误的 //stud.display();//私有继承；这样引用是错误的 stud.display1(); return 0; } //5.3在派生类中引用保护成员 #include #include using namespace std; class Student { protected: int num; string name; char sex; public: void display(); }; void Student::display() { cout<<"num:"< cout<<"name:"< cout<<"sex:"< } class Student1:protected Student { private: int age; string addr; public: void display1(); }; void Student1::display1() { cout<<"num:"< cout<<"name:"< cout<<"sex:"< cout<<"age:"< cout<<"address:"< } int main() { Student1 stud1; stud1.display1(); //stud1.num=10023;//错误；外界不能访问保护成员 return 0; } //5.4多级派生的访问属性 class A { public: int i; protected: void f2(); int j; private: int k; }; class B:public A { public: void f3(); protected: void f4(); private: int m; }; class C:protected B { public: void f5(); private: int n; }; //5.5简单的派生类的构造函数 #include #include using namespace std; class Student { protected: int num; string name; char sex; public: Student(int n,string nam,char s) { num=n; name=nam; sex=s; } ~Student(){} }; class Student1:public Student { private: int age; string addr; public: Student1(int n,string nam,char s,int a,string ad):Student(n,nam,s)//派生类构造函数 { age=a; addr=ad; } void show() { cout<<"num:"< cout<<"name:"< cout<<"sex:"< cout<<"age:"< cout<<"address:"< } ~Student1(){} }; int main() { Student1 stud1(10010,"wang_li",'f',19,"115 Beijing Road,Shanghai"); Student1 stud2(10011,"zhang_feng",'m',20,"213 Shanghai Road ,Beijing"); stud1.show(); stud2.show(); return 0; } //5.6包含子对象的派生类的构造函数 #include #include using namespace std; class Student { protected: int num; string name; public: Student(int n,string nam) { num=n; name=nam; } void display() { cout<<"num:"< cout<<"name:"< } }; class Student1:public Student { private: Student monitor;//子对象 int age; string address; public: Student1(int n,string nam,int n1,string nam1,int a,string add):Student(n,nam),monitor(n1,nam1) { age=a; address=add; } void show() { cout<<"This student is:"< display(); cout<<"age:"< cout<<"address:"< } void show_monitor() { cout< cout<<"Class monitor is:"< monitor.display(); } }; int main() { Student1 stud1(10010,"wang li",10011,"li sun", 19,"changchungongyedaxue,Changchun"); stud1.show(); stud1.show_monitor(); return 0; } //5.7多级派生情况下派生类的构造函数 #include #include using namespace std; class Student { protected: int num; string name; public: Student(int n,string nam) { num=n; name=nam; } void display() { cout<<"num:"< cout<<"name:"< } }; class Student1:public Student { public: Student1(int n,string nam,int a):Student(n,nam) { age=a; } void show() { display(); cout<<"age:"< } private: int age; }; class Student2:public Student1 { public: Student2(int n,string nam,int a,int s):Student1(n,nam,a) { score=s; } void show_all() { show();//课本上没有void,要是加上void就不输出前面的数据了 cout<<"score:"< } private: int score; }; int main() { Student2 stud(10010,"wangli",17,89); stud.show_all(); return 0; } //5.8声明教师（Teacher）类和学生（Student）类，用多重继承的方式声明一个研究生（Graduate）派生类。教师类中包含数据成员 //name（姓名）、age（年龄）、title（职称）。学生类中包括数据成员name1（姓名）、sex（性别）、score（成绩）。在定义 //派生类时给出初始化的数据；然后输出这些数据 //此程序没有调通，可能是编译器的问题 #include #include using namespace std; class Teacher { public: Teacher(string nam,int a,string t) { name=nam; age=a; title=t; } void display() { cout<<"name:"< cout<<"age:"< cout<<"title:"< } protected: string name; int age; string title; }; class Student { public: Student(char nam[],char s,float sco) { strcpy(name1,nam);//此处有问题 sex=s; score=sco; } void display1() { cout<<"name:"< cout<<"sex:"< cout<<"score:"< } protected: string name1; char sex; float score; }; class Graduate:public Teacher,public Student { public: Graduate(string nam,int a,char s,string t,float sco,float w):Teacher(nam,a,t), Student(nam,s,sco),wage(w){} void show() { cout<<"name:"< cout<<"age:"< cout<<"sex:"< cout<<"score:"< cout<<"title:"< cout<<"wage:"< } private: float wage; }; int main() { Graduate grad("wangli",23,'f',"assistant",89.5,1234.5); grad.show(); return 0; } //5.8.1声明教师（Teacher）类和学生（Student）类，用多重继承的方式声明一个研究生（Graduate）派生类。教师类中包含数据成员 //name（姓名）、age（年龄）、title（职称）。学生类中包括数据成员name1（姓名）、sex（性别）、score（成绩）。在定义 //派生类时给出初始化的数据；然后输出这些数据 //此程序没有调通，可能是编译器的问题,修改以后了，可以调通了 #include #include using namespace std; class Teacher { public: Teacher(string nam,int a,string t) { name=nam; age=a; title=t; } void display() { cout<<"name:"< cout<<"age:"< cout<<"title:"< } protected: string name; int age; string title; }; class Student { public: Student(string nam,char s,float sco) //源程序：Student (char nam[],char s,float sco) { name1=nam;//源程序是strcpy(name1,nam) sex=s; score=sco; } void display1() { cout<<"name:"< cout<<"sex:"< cout<<"score:"< } protected: string name1; char sex; float score; }; class Graduate:public Teacher,public Student { public: Graduate(string nam,int a,char s,string t,float sco,float w):Teacher(nam,a,t), Student(nam,s,sco),wage(w){} void show() { cout<<"name:"< cout<<"age:"< cout<<"sex:"< cout<<"score:"< cout<<"title:"< cout<<"wage:"< } private: float wage; }; int main() { Graduate grad("wangli",23,'f',"assistant",89.5,1234.5); grad.show(); return 0; } //5.9在Teacher类和Student类之上增加一个共同的基类Person， //作为人员的一些基础数据放在Person中；在Teacher类和Student类 //在增加一些必要的数据 #include #include using namespace std; class Person { protected: string name; char sex; int age; public: Person(string nam,char s,int a) { name=nam; sex=s; age=a; } }; class Teacher:virtual public Person { public: Teacher(string nam,char s,int a,string t):Person(nam,s,a){title=t;} protected: string title; }; class Student:virtual public Person { public: Student(string nam,char s,int a,float sco):Person(nam,s,a),score(sco){} protected: float score; }; class Graduate:public Teacher,public Student { public: Graduate(string nam,char s,int a,string t,float sco,float w):Person(nam,s,a), Teacher(nam,s,a,t),Student(nam,s,a,sco),wage(w){} void show() { cout<<"name:"< cout<<"age:"< cout<<"sex:"< cout<<"score:"< cout<<"title:"< cout<<"wages:"< } private: float wage; }; int main() { Graduate grad("wang-li",'f',24,"assistant",89.3,1234.5); grad.show(); return 0; } //5.10定义一个基类Student（学生），再定义Student类的公用派生类Graduate //（研究生），用指向基类对象的指针输出数据 #include #include using namespace std; class Student { private: int num; string name; float score; public: Student(int ,string ,float); void display(); }; Student::Student(int n,string nam,float s) { num=n; name=nam; score=s; } void Student::display() { cout< cout<<"num:"< cout<<"name:"< cout<<"score:"< } class Graduate:public Student { public: Graduate(int ,string,float,float); void display(); private: float pay; }; Graduate::Graduate(int n,string nam,float s,float p):Student(n,nam,s),pay(p){} void Graduate::display() { Student::display(); cout<<"pay="< } int main() { Student stud(1001,"Li",87.5); Graduate grad(2001,"wang",98.5,5599.8); Student *pt=&stud; pt->display(); pt=&grad; pt->display(); return 0; }