1:
#include
using namespace std;
class Student
{public:
void get_value()
{cin>>num>>name>>sex;}
void display( )
{cout<<"num: "< cout<<"name: "< cout<<"sex: "< private : int num; char name[10]; char sex; }; class Student1: public Student {public: void get_value_1() {get_value(); cin>>age>>addr;} void display_1() { cout<<"age: "< cout<<"address: "< private: int age; char addr[30]; }; int main() {Student1 stud1; stud1.get_value_1(); stud1.display(); stud1.display_1(); return 0; } 2: #include using namespace std; class Student {public: void get_value() {cin>>num>>name>>sex;} void display( ) {cout<<"num: "< cout<<"name: "< cout<<"sex: "< private : int num; char name[10]; char sex; }; class Student1: private Student {public: void get_value_1() {get_value(); cin>>age>>addr;} void display_1() {display(); cout<<"age: "< cout<<"address: "< private: int age; char addr[30]; }; int main() {Student1 stud1; stud1.get_value_1(); stud1.display_1(); return 0; } 3: #include using namespace std; class Student //声明基类 {public: //基类公用成员 void get_value(); void display( ); protected : //基类保护成员 int num; char name[10]; char sex; }; void Student::get_value() {cin>>num>>name>>sex;} void Student::display( ) {cout<<"num: "< cout<<"name: "< cout<<"sex: "< } class Student1: protected Student //声明一个保护派生类 {public: void get_value_1(); void display1( ); private: int age; char addr[30]; }; void Student1::get_value_1() {get_value(); cin>>age>>addr; } void Student1::display1( ) {cout<<"num: "< cout<<"name: "< cout<<"sex: "< cout<<"age: "< cout<<"address: "< } int main( ) {Student1 stud1; //stud1是派生类student1类的对象 stud1.get_value_1(); //调用派生类对象stud1的公用成员函数 stud1.display1( ); //调用派生类对象stud1的公用成员函数 return 0; } 4: 解法一 #include using namespace std; class Student//声明基类 {public: //基类公用成员 void get_value(); void display( ); protected : //基类保护成员 int num; char name[10]; char sex; }; void Student::get_value() {cin>>num>>name>>sex;} void Student::display( ) {cout<<"num: "< cout<<"name: "< cout<<"sex: "< } class Student1: public Student //声明一个公用派生类 {public: void get_value_1(); void display1( ); private: int age; char addr[30]; }; void Student1::get_value_1() {get_value(); cin>>age>>addr; } void Student1::display1( ) {cout<<"num: "< cout<<"name: "< cout<<"sex: "< cout<<"age: "< cout<<"address: "< } int main( ) {Student1 stud1; //stud1是派生类student1类的对象 stud1.get_value_1(); //调用派生类对象stud1的公用成员函数get_value_1 stud1.display1( ); //调用派生类对象stud1的公用成员函数display1 return 0; } 解法二 #include using namespace std; class Student //声明基类 {public: //基类公用成员 void get_value(); void display( ); protected : //基类保护成员 int num; char name[10]; char sex; }; void Student::get_value() {cin>>num>>name>>sex;} void Student::display( ) {cout<<"num: "< cout<<"name:"< cout<<"sex:"< } class Student1: protected Student //声明一个公用派生类 {public: void get_value_1(); void display1( ); private: int age; char addr[30]; }; void Student1::get_value_1() {cin>>age>>addr;} void Student1::display1( ) {cout<<"age:"< cout<<"address:"< } int main( ) {Student1 stud1; //stud1是派生类student1类的对象 stud1.get_value(); stud1.get_value_1(); stud1.display( ); stud1.display1(); //合法。display1是派生类中的公用成员函数 return 0; } 5： class A //A为基类 {public: void f1( ); int i; protected: void f2(); int j; private: int k; }; class B: public A //B为A的公用派生类 {public: void f3( ); protected: int m; private: int n; }; class C: public B //C为B的公用派生类 {public: void f4(); private: int p; }; int main() {A a1; //a1是基类A的对象 B b1; //b1是派生类B的对象 C//c1是派生类C的对象 return 0; } 6： #include using namespace std; class A {public: void f1( ); protected: void f2(); private: int i; }; class B: public A {public: void f3( ); int k; private: int m; }; class C: protected B {public: void f4(); protected: int n; private: int p; }; class D: private C {public: void f5(); protected: int q; private: int r; }; int main() {A a1; B b1; C c1; D d1; return 0; } 7： #include using namespace std; class A { public: A(){a=0;b=0;} A(int i){a=i;b=0;} A(int i,int j){a=i;b=j;} void display(){cout<<"a="< ~A(){cout<<"destructing A "< }; class B : public A { public: B(){cout<<"constructing B "< ~B(){cout<<"destructing B "< }; class C : public B { public: C(){cout<<"constructing C "< ~C(){cout<<"destructing C "< }; int main() { C c1; return 0; } 9： #include #include using namespace std; class Teacher {public: Teacher(string nam,int a,char s,string tit,string ad,string t); void display(); protected: string name; int age; char sex; string title; string addr; string tel; }; Teacher::Teacher(string nam,int a,char s,string tit,string ad,string t): name(nam),age(a),sex(s),title(tit),addr(ad),tel(t){ } void Teacher::display() {cout<<"name:"< cout<<"age"< cout<<"sex:"< cout<<"title:"< cout<<"address:"< cout<<"tel:"< } class Cadre {public: Cadre(string nam,int a,char s,string p,string ad,string t); void display(); protected: string name; int age; char sex; string post; string addr; string tel; }; Cadre::Cadre(string nam,int a,char s,string p,string ad,string t): name(nam),age(a),sex(s),post(p),addr(ad),tel(t){} void Cadre::display() {cout<<"name:"< cout<<"age:"< cout<<"sex:"< cout<<"post:"< cout<<"address:"< cout<<"tel:"< } class Teacher_Cadre:public Teacher,public Cadre {public: Teacher_Cadre(string nam,int a,char s,string tit,string p,string ad,string t,float w); void show( ); private: float wage; }; Teacher_Cadre::Teacher_Cadre(string nam,int a,char s,string t,string p,string ad,string tel,float w): Teacher(nam,a,s,t,ad,tel),Cadre(nam,a,s,p,ad,tel),wage(w) {} void Teacher_Cadre::show( ) {Teacher::display(); cout<<"post:"< cout<<"wages:"< } int main( ) {Teacher_Cadre te_ca("Wang-li",50,'f',"prof.","president","135 Beijing Road,Shanghai","(021)61234567",1534.5); te_ca.show( ); return 0; } 10： #include #include using namespace std; class Teacher //教师类 {public: Teacher(int,char [],char); //声明构造函数 void display(); //声明输出函数 private: int num; char name[20]; char sex; }; Teacher::Teacher(int n,char nam[],char s) //定义构造函数 {num=n; strcpy(name,nam); sex=s; } void Teacher::display() //定义输出函数 {cout<<"num:"< cout<<"name:"< cout<<"sex:"< } class BirthDate //生日类 {public: BirthDate(int,int,int); //声明构造函数 void display(); //声明输出函数 void change(int,int,int); //声明修改函数 private: int year; int month; int day; }; BirthDate::BirthDate(int y,int m,int d) //定义构造函数 {year=y; month=m; day=d; } void BirthDate::display() //定义输出函数 {cout<<"birthday:"< void BirthDate::change(int y,int m,int d) //定义修改函数 {year=y; month=m; day=d; } class Professor:public Teacher //教授类 {public: Professor(int,char [],char,int,int,int,float); //声明构造函数 void display(); //声明输出函数 void change(int,int,int); //声明修改函数 private: float area; BirthDate birthday; //定义BirthDate类的对象作为数据成员 }; Professor::Professor(int n,char nam[20],char s,int y,int m,int d,float a): Teacher(n,nam,s),birthday(y,m,d),area(a){ } //定义构造函数 void Professor::display() //定义输出函数 {Teacher::display(); birthday.display(); cout<<"area:"< } void Professor::change(int y,int m,int d) //定义修改函数 {birthday.change(y,m,d); } int main() {Professor prof1(3012,"Zhang",'f',1949,10,1,125.4); //定义Professor对象prof1 cout< prof1.display(); //调用prof1对象的display函数 cout< prof1.change(1950,6,1); //调用prof1对象的change函数 prof1.display(); //调用prof1对象的display函数 return 0; }