C++课后习题作业

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();
a7ef
//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;
}

<img src="https://img-blog.csdn.net/20150518222245161?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" /><img src="https://img-blog.csdn.net/20150518222244705?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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