c++面向对象程序设计 谭浩强 第五章答案

1:

#include <iostream>

using namespace std;

class Student

{public:

void get_value()

{cin>>num>>name>>sex;}

void display( )

{cout<<"num: "<<num<<endl;

cout<<"name: "<<name<<endl;

cout<<"sex: "<<sex<<endl;}

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: "<<age<<endl;          //引用派生类的私有成员，正确。

cout<<"address: "<<addr<<endl;}    //引用派生类的私有成员，正确。

private:

int age;

char addr[30];

};

int  main()

{Student1 stud1;

stud1.get_value_1();

stud1.display();

stud1.display_1();

return 0;

}

2:

#include <iostream>

using namespace std;

class Student

{public:

void get_value()

{cin>>num>>name>>sex;}

void display( )

{cout<<"num: "<<num<<endl;

cout<<"name: "<<name<<endl;

cout<<"sex: "<<sex<<endl;}

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: "<<age<<endl;        //引用派生类的私有成员，正确。

cout<<"address: "<<addr<<endl;}    //引用派生类的私有成员，正确。

private:

int age;

char addr[30];

};

int main()

{Student1 stud1;

stud1.get_value_1();

stud1.display_1();

return 0;

}

3:

#include <iostream>

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: "<<num<<endl;

cout<<"name: "<<name<<endl;

cout<<"sex: "<<sex<<endl;

}

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: "<<num<<endl;         //引用基类的保护成员

cout<<"name: "<<name<<endl;       //引用基类的保护成员

cout<<"sex: "<<sex<<endl;         //引用基类的保护成员

cout<<"age: "<<age<<endl;         //引用派生类的私有成员

cout<<"address: "<<addr<<endl;    //引用派生类的私有成员

}

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 <iostream>

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: "<<num<<endl;

cout<<"name: "<<name<<endl;

cout<<"sex: "<<sex<<endl;

}

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: "<<num<<endl;     //引用基类的保护成员，合法

cout<<"name: "<<name<<endl;       //引用基类的保护成员，合法

cout<<"sex: "<<sex<<endl;         //引用基类的保护成员，合法

cout<<"age: "<<age<<endl;         //引用派生类的私有成员，合法

cout<<"address: "<<addr<<endl;    //引用派生类的私有成员，合法

}

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 <iostream>

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: "<<num<<endl;

cout<<"name:"<<name<<endl;

cout<<"sex:"<<sex<<endl;

}

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:"<<age<<endl;

cout<<"address:"<<addr<<endl;

}

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 <iostream>

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 <iostream>

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<<" b="<<b;}

private:

int a;

int b;

};

class B  : public A

{

public:

B(){c=0;}

B(int i):A(i){c=0;}

B(int i,int j):A(i,j){c=0;}

B(int i,int j,int k):A(i,j){c=k;}

void display1()

{display();

cout<<" c="<<c<<endl;

}

private:

int c;

};

int main()

{   B b1;

B b2(1);

B b3(1,3);

B b4(1,3,5);

b1.display1();

b2.display1();

b3.display1();

b4.display1();

return 0;

}

8：

#include <iostream>

using namespace std;

class A

{

public:

A(){cout<<"constructing A "<<endl;}

~A(){cout<<"destructing A "<<endl;}

};

class B  : public A

{

public:

B(){cout<<"constructing B "<<endl;}

~B(){cout<<"destructing B "<<endl;}

};

class C  : public B

{

public:

C(){cout<<"constructing C "<<endl;}

~C(){cout<<"destructing C "<<endl;}

};

int main()

{ C c1;

return 0;

}

9：

#include<string>

#include <iostream>

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:"<<name<<endl;

cout<<"age"<<age<<endl;

cout<<"sex:"<<sex<<endl;

cout<<"title:"<<title<<endl;

cout<<"address:"<<addr<<endl;

cout<<"tel:"<<tel<<endl;

}

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:"<<name<<endl;

cout<<"age:"<<age<<endl;

cout<<"sex:"<<sex<<endl;

cout<<"post:"<<post<<endl;

cout<<"address:"<<addr<<endl;

cout<<"tel:"<<tel<<endl;

}

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:"<<Cadre::post<<endl;

cout<<"wages:"<<wage<<endl;

}

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 <iostream>

#include <cstring>

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:"<<num<<endl;

cout<<"name:"<<name<<endl;

cout<<"sex:"<<sex<<endl;

}

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:"<<month<<"/"<<day<<"/"<<year<<endl;}

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:"<<area<<endl;

}

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<<endl<<"original data:"<<endl;

prof1.display();                                     //调用prof1对象的display函数

cout<<endl<<"new data:"<<endl;

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;

}