李爱华、程磊_面向对象程序设计课后答案(完整版)

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)x y z500 10000500200 15002-6#include using namespa

2、ce 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(string name,int

3、 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3-1(1 )A (2)C (3)B (4

4、)C (5) C(6)B(7)B (8)C (9)C3-7(1 ) main() 函数中p1.age = 30; 语句是错误的。age 是类的私有成员 2) 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

5、(38,15); 改为：A.Init(38,15);Print(); 改为：A.Print();3-8(1)Constructing AConstructing BDestructing BDestructing A(2)double a,double bpoint & pp.x3-9class boxint 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

6、:void Init(int a,int b)m1 = a;m2 = b;void Pring()coutm1 m2endl;3-11略3-12第四章4-6（ 1） D （ 2） D （ 3） D （ 4） D （ 5） B（ 6） D4-7（ 1）static 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;p

7、ublic:const int y2;Ctest（int i1,int i2）:y1（i1）,y2（i2）y1 =10;/y1 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()coutcons

8、tructor C:;运行结果为：constructor Aconstructor Bconstructor C(2)40(3)3(4)34-9#include#includeclass Dateint 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)

9、;int count_day(Date &d,int k)static int day_tab212=31,28,31,30,31,30,31,31,30,31,30,31,31,29,31,30,31,30,31,31,30,31,30,31;/ 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1else j=0;/ 非闰年，取0if(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.mon

10、th-d.day;for(i=d.month+1; i=12; i+)s+=day_tabji-1;return 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+=

11、366L;else非闰年days+=365L;days+=count_day(d2,1);else if(d1.year=d2.year)day1=count_day(d1,1);day2=count_day(d2,1); days=day2-day1;elsedays=-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, month

12、2, day2);int ds=h(d1,d2);cout 输出结果:=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#includeclass 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:n

13、amest2.number;/返回成员number 的比较结果int main()Studentst5=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.

14、Print ();return 0;4-11#include #include 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 author

15、endl;coutname nameendl;coutprice saleendl;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 intx; 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

16、i):BC(i);(3)将DC 构造函数改为:DC(int i):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 Shape int 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,i

17、nt iy,int r):Shape(ix,iy),radius(r) void show() Shape:show ();coutcircle: radiusendl;class Rect :public Shape int 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

18、,8,8);Circle c1(3,3,9); r1.show (); c1.show();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(in

19、t date,float price,int passengers=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

20、:get_date()return 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;veh

21、icle: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(2001,2000

22、,5);truck tru1(2002,8000,340000);cout 输出结果 endl;car1. show ();tru1. show ();第六章6-4d=3D:fun();6-5C:print(),cinfo=2C:print(),cinfo=2D:print(),dinfo=4B 类不能定义对象，否则编译通不过，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 Mammal public:virtual void Speak()coutin Mammalendl;class Dog:pu

23、blic Mammal public: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;delete pbase

24、;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() return 6*

25、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 Area() retur

26、n 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 Trapezoid(4,2,5);pS

27、5 = 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#include using

28、 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;第七章7-1#incl

29、ude #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;void show()cout(x,y)endl;int main()vector v1(1,2),v2(3,4),v3;v3 = v1+v2;v1+=v2;v3.sh

30、ow();v1.show();return 0;7-2#include class Complexprivate:double real,image;public:Complex(double x=0.0,double y=0.0) real =x; image =y;bool operator !=(const Complex &c);Complex operator -(const Complex &c);bool operator =(const Complex &c);Complex operator -();Complex &operator +=(const Complex &c)

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

32、ge!=c.image);Complex Complex :operator -()return Complex(-real,-image);Complex &Complex :operator +=(const Complex &c) real+=c.real;image+=c.image;return *this;int main()Complex 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.Pr

33、int();c3+=c2;c3.Print();if(c3 != c1)coutc3!=c1endl;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

34、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+;if(month12) yea

35、r+;month = 1; elseday+= i; break;return *this;void Date:showDate() coutyear.month.dayendl;int main()Date obj(1996,1,1); obj.showDate (); obj = obj+59; obj.showDate(); return 0;7-4 以 +， =为例#include#include using namespace std; class String char *sbuf; int length;public: String() length=0;sbuf=new cha

36、r;sbuf0=0;String(char *s)/用字符串初始化length=strlen(s);sbuf=new charlength+1;strcpy(sbuf,s);String (String& str)length=str.length ;sbuf=new charlength+1;strcpy(sbuf,str.sbuf );String()delete sbuf;String & operator =(String& str)if(sbuf = str.sbuf )return *this;elsesbuf = new charstr.length +1;strcpy(sbuf

37、,str.sbuf ); return *this;String operator +(String& str)/ 此函数需配合拷贝构造函数String st;st.length = length + str.length ;st.sbuf = new charst.length+1 ;st.sbuf 0 = 0;strcpy(st.sbuf,sbuf);strcat(st.sbuf,str.sbuf );return st;char & operator(int i)if(i=length) / 对下标进行检查，超出范围则报错退出程序cout 下标越界错误！endl;exit(0);retu

38、rn sbufi; void Show()coutsbufendl;);int main()(String s1(hello);String s2(world),s3 ;s3 = s1+s2; /s3.Show ();return 0;)7-6#include/using namespace std;class polynomial(int n,i;float *a;public :polynomial( int x)(n=x;a= new float n;polynomial ( const polynomial & p) /增加一个拷贝复制构造函数(n=p.n;a= new float p

39、.n;for ( int i= 0; ip.n; i+)( ai=p.ai;)polynomial()() polynomial()( deletea;)void seta( int y, float x)(ay=x;) void print()(cout y= an- 1 MxA(M n- 1= 0;i-)cout+ ai，八(i);cout=x.n)polynomial t(n);copy(t,*this );for (i= 0;ix.n;i+)/ix.nt.ai=t.ai+x.ai;return t; else polynomial t(x.n); copy(t,x);for (i= 0

40、;i=x.n)polynomial t(n);copy(t,*this );for (i= 0;i=x.n;i+) t.ai=t.ai-x.ai;return t; elsepolynomial t(x.n);copy(t,x);for (i= 0;i=n;i+)t.ai=t.ai-ai;return t;friend void copy(polynomial &x,polynomial &y);；void copy(polynomial &x,polynomial &y)(int i;if (x.ny.n)(cout 无法复制endl;x.print();y.print();system(p

41、ause);for (i= 0;i=y.n-1;i+)x.ai=y.ai;void main()polynomial j( 3),k( 4),h( 4);j.seta( 0, 1);j.seta(1,2);j.seta(2, 3);k.seta(0, 5);k.seta(1,6);k.seta(2, 7);k.seta(3, 7);j.print();k.print();polynomial m=k+j;/在这里再定义一个mcopy(h,k+j);h.print();/system(pause);第八章8-11 ) template T fun(T a)(2) template T test(

42、T a)(3) template class Arraypublic:void fun();template void Array:fun() (4)Array a1,a2,a3;8-4#include using namespace std;template T max(T a,T b,T c) T temp;temp=ab?a:b;temp=tempc?temp:c; return temp;int main()coutmax(11,29,22)endl;coutmax(3.14f,28.3f,6.7f)endl;coutmax(c,b,a)endl;return 0;8-5 及 8-6#include#include using namespace std;template void sort_bubble(T arr,int n) for(int i=0; in-1;i+)for(int j=0;jn-1-i;j+)if( arrjar