c++面向对象程序设计 谭浩强 第二章答案

Posted 2021-12-28 suibian1

第二章

类体内定义成员函数

#include <iostream>

using namespace std;

class Time

 

public:

void set_time();

void show_time();

private:                    //成员改为公用的

    int hour;

    int minute;

    int sec;

  ;

void Time::set_time()          //在main函数之前定义

 

  cin>>hour;

  cin>>minute;

  cin>>sec;

 

void Time::show_time()         //在main函数之前定义

 

  cout<<hour<<":"<<minute<<":"<<sec<<endl;

 

 

int main()

Time t1;

t1.set_time();

 t1.show_time();

 return 0;

 

2：

2.3 改写2.2：类体内声明成员函数，类外定义成员函数

#include <iostream>

using namespace std;

class Time

  public:

    void set_time(void)

     cin>>hour;

      cin>>minute;

      cin>>sec;

     

    void show_time(void)

     cout<<hour<<":"<<minute<<":"<<sec<<endl;

 

   private: int hour;

     int minute;

     int sec;

  ;

 c++面向对象程序设计 答案

Time t;

int main()

 

  t.set_time();

  t.show_time();

  return 0;

 

c++面向对象程序设计 谭浩强 

 3：

#include <iostream>

using namespace std;

class Time

  public:

    void set_time(void);

    void show_time(void);

   private:

    int hour;

    int minute;

    int sec;

  ;

 c++面向对象程序设计 谭浩强 

void Time::set_time(void)

  cin>>hour;

   cin>>minute;

   cin>>sec;

  

 

void Time::show_time(void)

cout<<hour<<":"<<minute<<":"<<sec<<endl;

 

Time t;

int main()

t.set_time();

  t.show_time();

  return 0;

 

4：

//xt2-4-1.cpp(main.cpp)

#include <iostream>

using namespace std;

#include "xt2-4.h"

int main()

Student stud;

 stud.set_value();

 stud.display();

 return 0;

 

//xt2-4-2.cpp(即student.cpp)

#include "xt2-4.h"                      //在此文件中进行函数的定义

#include <iostream>

using namespace std;                   //不要漏写此行

void Student::display( )              

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

  cout<<"name:"<<name<<endl;

  cout<<"sex:"<<sex<<endl;

 

void Student::set_value()

cin>>num;

cin>>name;

  cin>>sex;

5：

//xt2-5-1.cpp(file1.cpp)

#include <iostream>

#include "xt2-5.h"

int main()

 Array_max  arrmax;

  arrmax.set_value();

  arrmax.max_value();

  arrmax.show_value();

  return 0;

 

 

//xt2-5-2.cpp(arraymax.cpp)

#include <iostream>

using namespace std;

#include "xt2-5.h"

void Array_max::set_value()

  int i;

   for (i=0;i<10;i++)

     cin>>array[i];

 

 

void Array_max::max_value()

 int i;

  max=array[0];

  for (i=1;i<10;i++)

   if(array[i]>max) max=array[i];

  

 

void Array_max::show_value()

 cout<<"max="<<max<<endl;

 

 

6：解法一

 

#include <iostream>

using namespace std;

class Box

public:

  void get_value();

  float volume();

  void display();

 public:

  float lengh;

  float width;

  float height;

  ;

 

void Box::get_value()

cout<<"please input lengh, width,height:";

  cin>>lengh;

  cin>>width;

  cin>>height;

 

float Box::volume()

return(lengh*width*height);

 

void Box::display()

cout<<volume()<<endl;

 

int main()

Box box1,box2,box3;

 box1.get_value();

 cout<<"volmue of bax1 is ";

 box1.display();

 box2.get_value();

 cout<<"volmue of bax2 is ";

 box2.display();

 box3.get_value();

 cout<<"volmue of bax3 is ";

 box3.display();

 return 0;

解法二：

#include <iostream>

using namespace std;

class Box

public:

  void get_value();

  void volume();

  void display();

 public:

  float lengh;

  float width;

  float height;

  float vol;

  ;

 

void Box::get_value()

cout<<"please input lengh, width,height:";

  cin>>lengh;

  cin>>width;

  cin>>height;

 

void Box::volume()

vol=lengh*width*height;

 

void Box::display()

cout<<vol<<endl;

 

int main()

Box box1,box2,box3;

 box1.get_value();

 box1.volume();

 cout<<"volmue of bax1 is ";

 box1.display();

 box2.get_value();

 box2.volume();

 cout<<"volmue of bax2 is ";

 box2.display();

 box3.get_value();

 box3.volume();

cout<<"volmue of bax3 is ";

 box3.display();

 return 0;