面向对象程序设计课后答案.doc

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1、. .第二章2-4#include using namespace std;Add(int a,int b);int main()int x,y,sum;coutxy;sum = add(x,y);cout x+y=sumendl;Add(int a,int b)return a+b;2-5(1)this is a C+ program.(2)x=50.6 y=10 z=Ax=216.34 y=10 z=Ax=216.34 y=2 z=Ax=216.34 y=2 z=E(3)xyz500100005001500150050020015002-6#include using namespace

2、std; int main() int *p,*init; int countp=0; int countn=0; p = new int20; init = p; for(int i=0;i*p; p+; p = p-20; for( i=0;i0) countp+; if(*p0) countn+; cout*p ; p+; cout正数有:countpendl; cout负数有:countnendl; p = init;delete p;return 0;2-7不做要求#include /#include using namespace std;void checkagescore(st

3、ring name,int age)if (name = exit) throw name;if(age50)throw age;int main()string name;int age;for(int i=0 ;iage ;trycheckagescore(name,age);catch( string)coutexception :name is exitendl;continue;catch(int)coutexception :age is not properendl;continue; coutname:name age :ageendl;return 0;第三章3-11A2C3

4、B4C5C6B 7B8C9C3-71main()函数中 p1.age = 30;语句是错误的。age 是类的私有成员2构造函数应当给常数据成员和引用成员初始化，将构造函数改为：A(int a1,int b1):a(a1),b(b1)或A(int a1 ):a(a1),b(a)再将main中的A a(1,2); 改为A a(1);(3)(1)在Test 类中添加语句：void print();void Print() coutx-y=x-yendl;改为void Test:Print() coutx-y=x-yendl;main函数中Init(38,15);改为：A.Init(38,15);Pr

5、int();改为：A.Print(); 3-8(1)Constructing AConstructing BDestructing BDestructing A(2)double a,double bpoint & pp.x3-9class box int len1,len2,len3;public: box(int l1,int l2,int l3)len1 = l1;len2 = l2; len3 = l3; long volumn()return len1*len2*len3;3-10class Testint m1,m2; public:void Init(int a,int b)m1

6、 = a;m2 = b;void Pring()coutm1 m2endl;3-11略3-12第四章4-61D2D3D4D5B6D4-71static int count = 0;这样初始化静态成员值是不对的将其改为static int count;在类外，main函数前加int Sample:count = 0;2#include /#include using namespace std;class Ctestprivate:int x; const int y1;public:const int y2;Ctest(int i1,int i2):y1(i1),y2(i2)y1 =10;/y

7、1 为常量不能赋值x = y1;int readme() const;int Ctest:readme ()constint i;i = x;x+; /常函数内不能改变成员值return x;int main()Ctest c(2,8);int i = c.y2;c.y2 = i;/y2为常量,不能改值i = c.y1;/y1私有,类外不能访问return 0;将出错语句全部注释4-8(1)题中印刷错误，将class C构造函数改为：C()coutconstructor C:;运行结果为：constructor Aconstructor Bconstructor C(2)40(3)3434-9

8、#include#includeclass Date int year; int month; int day; public: Date(int y,int m,int d) year=y;month=m;day=d; void disp() coutyear month dayendl; friend int count_day(Date &d,int k); friend int l(int year); friend int h(Date &d1,Date &d2);int count_day(Date &d,int k) static int day_tab212=31,28,31,

9、30,31,30,31,31,30,31,30,31, 31,29,31,30,31,30,31,31,30,31,30,31; / 使用二维数组存放各月天数，第一行对应非闰年，第二行对应闰年 int j,i,s; if(l(d.year) j=1;/闰年，取1 else j=0;/非闰年，取0 if(k)/K非0时 s=d.day; for(i=1;id.month;i+)/d.month为输入的月份 s+=day_tabji-1; else/K为0时 s=day_tabjd.month-d.day; for(i=d.month+1; i=12; i+) s+=day_tabji-1; re

10、turn s;/S为相差的天数int l(int year) if(year%4=0&year%100!=0|year%400=0) / 是闰年 return 1; else / 不是闰年 return 0;int h(Date &d1,Date &d2) int days,day1,day2,y; if(d1.yeard2.year)/第一个日期年份小于第二个日期年份 days=count_day(d1,0); for(y=d1.year+1;yd2.year;y+) if(l(y)/闰年 days+=366L; else/非闰年 days+=365L; days+=count_day(d2

11、,1); else if(d1.year=d2.year) day1=count_day(d1,1); day2=count_day(d2,1); days=day2-day1; else days=-1; return days;void main() int year1,year2,month1,month2,day1,day2; cout输入日期1year1month1day1; cout输入日期2year2month2day2; Date d1( year1, month1, day1),d2( year2, month2, day2); int ds=h(d1,d2); cout输出

12、结果:=0) d1.disp(); printf(与); d2.disp(); printf(之间有%d天nn,ds); else/第一个日期小于第二个日期 cout时间错误!endl;4-10 #include #include class Studentint number;char name20;public:Student(int i=0,char *s=0)/构造学生对象 number=i; strcpy(name,s);void Print()/输出结果 coutNumber:numberendl;coutName:namest2.number;/返回成员number的比拟结果in

13、t main()Student st5=Student(65,Li),Student(78,Zhang),Student(80,wang),Student(92,zhao),Student(50,zhen);int max = 0;int min = 0;for(int i=1;i5;i+)if(!greaterthan(stmax,sti)max = i;if(!greaterthan(sti,stmin)min = i;cout最大成绩:endl; stmax.Print ();cout最小成绩:endl;stmin.Print ();return 0;4-11#include #incl

14、ude using namespace std;class Bookchar *name;char*author;int sale;public:Book() name = 0; author = 0; sale = -1;Book(char* a ,char* b,int c) name = new charstrlen(a)+1;strcpy(name,a);author = new charstrlen(b)+1;strcpy(author,b);sale = c;void print()coutautor authorendl;coutname nameendl;coutprice s

15、aleendl;Book() if(!name ) delete name;if(!author)delete author;int main() Book b1(c+,li ai hua,12); Book b2;return 0;第五章5-8 改错题答案不唯一(1) class DC int x;public:DC()x =100;(2)编译无错,但逻辑错误,可改为: class BCprotected:int x;public:BC(int i=0)x = i;class DC:private BCpublic:DC(int i):BC(i);(3)将DC构造函数改为:DC(int i)

16、:BC(i)y = 0;5-9(1) base class(2)(10,5)(3,9-18,33)(13,19)(13,19-18,33)(13,19)5-10#include using namespace std;class Shapeint x,y;public:Shape(int ix,int iy)x = ix; y = iy;virtual void show()coutpos: x yendl;class Circle :public Shapeint radius;public:Circle(int ix,int iy,int r):Shape(ix,iy),radius(r)

17、void show() Shape:show ();coutcircle: radiusendl;class Rect :public Shapeint width,higth;public:Rect(int ix,int iy,int iw,int ih):Shape(ix,iy),width(iw),higth(ih)void show() Shape:show ();coutwidth and higth: width higthendl;int main()Shape s1(1,1);Rect r1(2,2,8,8);Circle c1(3,3,9);r1.show ();c1.sho

18、w();return 0;5-11#include class vehicle / 定义汽车类 protected: int date; / 年份 float price; /价格public: vehicle(int date,float price); int get_date(); float get_price(); float date_load(); void show(); ; class car:public vehicle / 定义小车类 int passenger_load; / 载人数 public: car(int date,float price,int passen

19、gers=4); int get_passengers(); void show(); ; class truck:public vehicle / 定义卡车类 float payload; / 载重量 public: truck(int date,float price,float max_load=24000.00); float efficiency(); void show(); ; vehicle:vehicle(int date,float price) vehicle:date=date; vehicle:price=price; int vehicle:get_date() r

20、eturn date; float vehicle:get_price() return price; void vehicle:show() cout 年份: date 年 endl; cout 价格: price 元 endl; car:car(int date, float price, int passengers) :vehicle (date, price) passenger_load=passengers; int car:get_passengers () return passenger_load; void car:show() cout 车型:小车 endl; vehi

21、cle:show(); cout 载人: passenger_load 人 endl; cout endl; truck: truck(int date, float price,float max_load):vehicle(date,price) payload=max_load; float truck:efficiency() return payload; void truck:show() cout 车型:卡车 endl; vehicle: show (); cout 载重: efficiency() endl; cout endl; void main () car car1(2

22、001,2000,5); truck tru1(2002,8000,340000); cout 输出结果 endl; car1. show (); tru1. show (); 第六章6-4 d=3D:fun();6-5C:print(),cinfo=2C:print(),cinfo=2D:print(),dinfo=4B类不能定义对象，否那么编译通不过，因为B未定义基类A中的虚函数print(),它也是个虚基类。6-6#include using namespace std;class Mammalpublic:virtual void Speak()coutin Mammalendl;cl

23、ass Dog:public Mammalpublic:void Speak()coutdog barkSpeak ();return 0;运行结果: dog bark6-7#include using namespace std;class BaseClasspublic: virtual BaseClass()coutdestruct Baseendl;class Derived:public BaseClasspublic:Derived()coutdestruct derivedendl;int main()BaseClass *pbase;pbase = new Derived;de

24、lete pbase;结果将不能正常执行子类析构6-8 #include using namespace std;class Shapepublic:virtual double Area() = 0;class Circle :public Shapedouble radius;public:Circle(double r):radius(r)double Area() return 3.14*radius*radius;class Square :public Shapedouble radius;public:Square(double r):radius(r) double Area(

25、) return 6*radius*radius;class Rectangle :public Shapedouble width,radius;public:Rectangle(double w,double r):radius(r)width=w; double Area() return width*radius;class Trapezoid :public Shapedouble height,radius,length;public:Trapezoid(double h,double r,double l):radius(r)height=h;length=l; double A

26、rea() return height*(radius+length)/2;class Triangle :public Shapedouble height,radius;public:Triangle(double h,double r):radius(r)height=h; double Area() return height*radius/2;int main()double AreaSum= 0;Shape * pS6;pS1 = new Circle(1);pS2 = new Square(2); pS3 = new Rectangle(1,2); pS4 = new Trape

27、zoid(4,2,5); pS5 = new Triangle(4,2);AreaSum += pS1-Area();AreaSum += pS2-Area(); AreaSum += pS3-Area(); AreaSum += pS4-Area(); AreaSum += pS5-Area();cout总面积是：AreaSumendl;cout各三维图形面积如下：endl;cout圆形:Area()endl; cout正方形:Area()endl; cout长方形:Area()endl; cout梯形:Area()endl; cout三角形:Area()endl;return 0;6-9#

28、include using namespace std;class Studentpublic:virtual void show() = 0;class Junior :public Studentpublic:void show()coutthis would be info for junior studentsendl;class Senior :public Studentpublic:void show()coutthis would be info for Senior studentsshow ();pstu = new Senior;pstu-show ();return 0

29、;第七章7-1#include #include using namespace std;class vectorint x,y;public:vector(int ix=0,int iy=0)x =ix;y = iy;vector operator+(vector& v1)return vector(x+v1.x,y+v1.y);vector& operator+=(vector& v1)x +=v1.x;y +=v1.y;return *this;voidshow()cout(x,y)endl;int main()vector v1(1,2),v2(3,4),v3;v3 = v1+v2;v

30、1+=v2;v3.show();v1.show();return 0;7-2#include class plex private: double real,image;public: plex(double x=0.0,double y=0.0) real =x; image =y; bool operator !=(const plex &c);plex operator -(const plex &c); bool operator =(const plex &c); plex operator -(); plex &operator +=(const plex &c); void Pr

31、int();void plex:Print()coutreal + imageiendl; plex plex :operator -(const plex &c)plex temp(real-c.real,image-c.image);return temp;bool plex :operator =(const plex &c)return (real=c.real & image=c.image); bool plex:operator !=(const plex &c)return (real!=c.real | image!=c.image); plex plex :operator

32、 -()return plex(-real,-image); plex &plex :operator +=(const plex &c)real+=c.real; image+=c.image;return *this; int main()plex c1(2,7),c2(4,2),c3;c3=c1-c2; c3.Print();if(c3=c1)coutc3 equals to c1endl; else coutc3 doesn?t equale to c1endl;c3=-c2; c3.Print();c3+=c2;c3.Print();if(c3 != c1)coutc3!=c1end

33、l;return 0;7-3#include using namespace std;bool rn(int y)bool flag = 0;if(y%400=0 | y%4 =0&y%100!=0)flag = 1;return flag;class Date private:int month, day, year;public:Date(int m, int d, int y); Date& operator+(int days);void showDate(); ;Date:Date(int y, int m, int d) if (m0 & m0 & d0 & y0;)int diff ;switch(month)case 1:case 3:case 5:case 7:case 8:case 10:case 12: diff = 31 -day;break;case 4:case 6:case 9:case 11: diff = 30 -day;break;case 2:if (rn(year)diff = 29 - day;else diff = 28 -day; break;if(idiff)i-= diff+1;day = 1;month+;