c++第九章练习答案.docx

1、c+第九章练习答案1设计一个Person类，包含name、age、sex属性以及对这些属性操作的方法。实现并测试这个类。根据类的封装性要求，把name、age、sex声明为私有的数据成员，声明公有的成员函数Register()、ShowMe()来访问这些属性，在Register()函数中对数据成员进行初始化。person1通过cin来得到信息，person2通过Register(Zhang3, 19, m) 来得到信息。程序的运行结果如下所示：Enter a persons name, age and sex:Li4 18 fperson1:Li4 18 fperson2:Zhang3 19

2、m#include #include using namespace std;class Personprivate: char Name20; char Sex; int Age;public: void Register(char *name, int age, char sex); void ShowMe(); void Person: Register(char *name, int age, char sex) strcpy(Name, name); Age = age; Sex = (sex = m? m:f); void Person: ShowMe() cout Name Ag

3、e Sex endl;int main() char name20,sex; int age; Person person1,person2; coutEnter a persons name, age and sex:nameagesex; person1.Register(name,age,sex); coutperson1:; person1.ShowMe(); person1.Register(Zhang3,19,m); person2=person1; coutperson2:; person2.ShowMe(); return 0;2设计一个完整的Date类，包含属性day, mo

4、nth, year以及对这些属性操作的方法。实现并测试这个类。根据类的封装性要求，把day, month, year声明为私有的数据成员。输入输出函数为 void init(int,int,int)、void print_ymd()、void print_mdy()。程序的运行结果如下所示：Enter date(day month year:1 12 20102010-12-112-1-2010 (简单的日期类) 公有的数据成员#include using namespace std;class Datepublic: int day,mouth,year;void set_date(Date

5、& d);void show_date1(Date d);void show_date2(Date d);int main() coutEnter date(day month year:d.dayd.mouth d.year;void show_date1(Date d) coutd.mouth -d.day -d.year endl;void show_date2(Date d) coutd.year -d.mouth -d.day endl;(简单的完整日期类) 私有的数据成员#include using namespace std;class Dateprivate: int day,

6、mouth,year;public: void init(int,int,int); void print_ymd(); void print_mdy();void Date:init (int yy,int mm,int dd) mouth=(mm=1&mm=1900&yy=1&dd=31)?dd:1;void Date:print_ymd () coutyear-mouth-dayendl;void Date:print_mdy () coutmouth-day-yearendl;int main() coutEnter date(day month year:daymouthyear;

7、date1.init(year,mouth,day); date1.print_ymd(); date1.print_mdy(); return 0;3设计一个Dog类，包含name、age、sex和weight等属性以及对这些属性操作的方法。实现并测试这个类。根据类的封装性要求，把name、age、sex和weight声明为私有的数据成员，编写公有成员函数setdata()对数据进行初始化，GetName()、GetAge()、GetSex()和GetWeight()获取相应属性。初始化数据由用户输入。程序的运行结果如下所示：Please input name, age, sex and w

8、eightahuang 3 m 2.4Dogs name:ahuangDogs age:3Dogs sex:mDogs weight:2.4Dog speak:Arf!Arf!注意，其中第2行“ahuang 3 m 2.4”为输入，单引号为中文单引号#include #include using namespace std;class Dog char name20; char sex; int age; float weight;public: void Register(char * Name,int Age,char Sex,float Weight); char * GetName()

9、return name; int GetAge()return age; char GetSex()return sex; float GetWeight()return weight; void Speak()coutArf!Arf!endl;void Dog:Register(char * Name,int Age,char Sex,float Weight) strcpy(name,Name); age=Age; sex=Sex; weight=Weight;int main() coutPlease input name, age, sex and weightnameagesexwe

10、ight; dog1.Register(name,age,sex,weight); coutDogs name:dog1.GetName()endl; coutDogs age:dog1.GetAge()endl; coutDogs sex:dog1.GetSex()endl; coutDogs weight:dog1.GetWeight()endl; coutDog speak:; dog1.Speak(); return 0;4设计并测试一个名为Ellipse的椭圆类，其属性为外接矩形的左上角与右下角两个点的坐标，并能计算出椭圆的面积。根据类的封装性要求，在类的声明中用4个私有的整型变量表

11、示两个点的坐标值，声明成员函数initial(int,int,int,int)初始化数据成员，函数GetPosition(int&,int&,int&,int&)读取坐标值，函数Area()计算面积。程序的运行结果如下所示：Please input 4 integers to define a ellipse:3 3 9 9The area of e1:28.2743The coordinates of e2:1,1,4,3#include #include using namespace std;class Ellipse private: int x1,y1,x2,y2;public: E

12、llipse(int,int,int,int); void GetPosition(int&,int&,int&,int&); double Area();Ellipse:Ellipse(int a,int b,int c,int d):x1(a),y1(b),x2(c),y2(d)void Ellipse:GetPosition(int &a,int &b,int &c,int &d) a=x1,b=y1,c=x2,d=y2;double Ellipse:Area() return (double)abs(x1-x2)*(y1-y2)/4*3.14159;int main() int x1,

13、y1,x2,y2; coutPlease input 4 integers to define a ellipse: x1 y1 x2 y2; Ellipse e1(x1,y1,x2,y2); Ellipse e2(1,1,4,3); e2.GetPosition(x1,y1,x2,y2); coutThe area of e1:e1.Area()endl; coutThe coordinates of e2:x1,y1,x2,y2endl; return 0;5仿照Date类设计一个Time类，成员函数SetTime()设置时间，print_12()以12小时制显示时间（AM上午，PM下午）

14、，print_24()以24小时制显示时间。程序的运行结果如下所示：Please input a time(h,m,s)13 23 3401:23:34 PM13:23:34#include #include using namespace std;class Time int hour,minute,second;public: int SecCalc(); Time(int h=0,int m=0,int s=0); void SetTime(int h=0,int m=0,int s=0); void print_12(); void print_24(); void print_hms

15、(); Time Add(Time&); Time Sub(Time&);Time:Time(int h,int m,int s)SetTime(h,m,s);void Time:SetTime(int hh,int mm,int ss) hour=(hh=0&hh=0&mm=0&ss=59)?ss:0;void Time:print_24() cout(hour10)?0:0)hour: (minute10)?0:0)minute: (second10)?0:0)second;void Time:print_12() int hh=(hour=0|hour=12)?12:hour%12; c

16、out(hour10)?0:0)hh: minute: second (hour12?AM:PM);void Time:print_hms() couthour:minute:secondendl;int Time:SecCalc() return(hour*60+minute)*60+second;Time Time:Add(Time& t) Time tmp; int ss; ss=SecCalc()+t.SecCalc(); tmp.hour=ss/3600%24; tmp.minute=ss%3600/60; tmp.second=ss%3600%60; return tmp;Time

17、 Time:Sub(Time& t) Time tmp; int ss; ss=abs(SecCalc()-t.SecCalc(); tmp.hour=ss/3600%24; tmp.minute=ss%3600/60; tmp.second=ss%3600%60; return tmp;int main() Time t1(2,34),t2; coutPlease input a time(h,m,s)hms; t2.SetTime(h,m,s); t2.print_12(); cout endl; t2.print_hms(); return 0;#include #include usi

18、ng namespace std;class Time int hour,minute,second;public: int SecCalc(); Time(int h=0,int m=0,int s=0); void SetTime(int h=0,int m=0,int s=0); void print_12(); void print_24(); void print_hms(); Time Add(Time&); Time Sub(Time&);Time:Time(int h,int m,int s)SetTime(h,m,s);void Time:SetTime(int hh,int

19、 mm,int ss) hour=(hh=0&hh=0&mm=0&ss=59)?ss:0;void Time:print_24() cout(hour10)?0:)hour: (minute10)?0:)minute: (second10)?0:)second; coutendl;void Time:print_12() int hh=(hour=0|hour=12)?12:hour%12; cout(hour10)?0: )hh: minute: second (hour12?AM:PM);void Time:print_hms() couthour:minute:secondendl;in

20、t Time:SecCalc() return(hour*60+minute)*60+second;Time Time:Add(Time& t) Time tmp; int ss; ss=SecCalc()+t.SecCalc(); tmp.hour=ss/3600%24; tmp.minute=ss%3600/60; tmp.second=ss%3600%60; return tmp;Time Time:Sub(Time& t) Time tmp; int ss; ss=abs(SecCalc()-t.SecCalc(); tmp.hour=ss/3600%24; tmp.minute=ss

21、%3600/60; tmp.second=ss%3600%60; return tmp;int main() Time t2; coutPlease input a time(h,m,s)hms; t2.SetTime(h,m,s); t2.print_12(); cout endl; t2.print_24(); return 0;6设计一个Circle（圆）类，其私有数据成员有圆心坐标x和y及半径r。其公有成员函数为：Set(int,int,double);设置圆的属性；void show(void); 显示圆心和半径；double circumference(void);计算周长；dou

22、ble area(void);计算面积；在主函数中用该类声明对象，输入圆心、半径，调用相关函数为对象设置属性，显示圆的半径、圆心，计算圆的周长、面积。注意，圆周率用3.14。程序运行结果如下：请输入圆心坐标和圆的半径1 1 1.5该圆为圆心(1,1)半径1.5圆的周长为9.42圆的面积为7.065#includeusing namespace std;class yuan int x,y; double r;public: void set(int,int,double); double c()return 2*3.14*r; double area();void yuan:set(int a

23、,int b,double c) x=a,y=b,r=c;double yuan:area() return 3.14*r*r;int main() int x,y; double r; cout请输入圆心坐标和圆的半径xyr; yuan y1; y1.set(x,y,r); cout该圆为endl; cout圆心(x,y)endl; cout半径rendl; cout圆的周长为y1.c()endl; cout圆的面积为y1.area()endl; return 0;#includeusing namespace std;class yuan int x,y; double r;public:

24、 void set(int,int,double); double circumference(); double area();void yuan:set(int a,int b,double c) x=a,y=b,r=c;double yuan:circumference() return 2*3.14*r;double yuan:area() return 3.14*r*r;int main() int x,y; double r; cout请输入圆心坐标和圆的半径xyr; yuan y1; y1.set(x,y,r); cout该圆为endl; cout圆心(x,y)endl; cout半径rendl; cout圆的周长为y1.circumference()endl; cout圆的面积为y1.area()endl; return 0;