李爱华、程磊_面向对象程序设计课后答案(完整版).doc

【精品文档】如有侵权，请联系网站删除，仅供学习与交流李爱华、程磊_面向对象程序设计课后答案(完整版).精品文档.第二章2-4#include <iostream>using namespace std;Add(int a,int b);int main()int x,y,sum;cout<<"please input x and y:"cin>>x>>y;sum = add(x,y);cout <<x<<"+"<<y<<"="<<sum<<endl;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 <iostream>using namespace std; int main() int *p,*init; int countp=0; int countn=0; p = new int20; init = p; for(int i=0;i<20;i+) cin>>*p; p+; p = p-20; for( i=0;i<20;i+) if(*p>0) countp+; if(*p<0) countn+; cout<<*p<<" " p+; cout<<"正数有:"<<countp<<endl; cout<<"负数有:"<<countn<<endl; p = init;delete p;return 0;2-7不做要求#include <iostream>/#include <string>using namespace std;void checkagescore(string name,int age)if (name = "exit") throw name;if(age<0|age>50)throw age;int main()string name;int age;for(int i=0 ;i<5 ;i+ )cin.ignore ();getline(cin,name );cin>>age ;trycheckagescore(name,age);catch( string)cout<<"exception :name is exit"<<endl;continue;catch(int)cout<<"exception :age is not proper"<<endl;continue;cout<<"name:"<<name<<" age :"<<age<<endl;return 0;第三章3-1（1）A（2）C（3）B（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）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() cout<<x<<"-"<<y<<"="<<x-y<<endl;改为void Test:Print() cout<<x<<"-"<<y<<"="<<x-y<<endl;main函数中Init(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 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 = a;m2 = b;void Pring()cout<<m1<<" "<<m2<<endl;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 <iostream>/#include <cstdlib>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;/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()cout<<"constructor C:"运行结果为：constructor Aconstructor Bconstructor C(2)40(3)3434-9#include<iostream.h>#include<stdio.h>class Date int year; int month; int day; public: Date(int y,int m,int d) year=y;month=m;day=d; void disp() cout<<year<<" "<<month<<" "<<day<<endl; 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=31,28,31,30,31,30,31,31,30,31,30,31, 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;i<d.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; 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.year<d2.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;y<d2.year;y+) if(l(y)/闰年 days+=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; else days=-1; return days;void main() int year1,year2,month1,month2,day1,day2; cout<<"输入日期1"<<endl; cin>>year1>>month1>>day1; cout<<"输入日期2"<<endl; cin>>year2>>month2>>day2; Date d1( year1, month1, day1),d2( year2, month2, day2); int ds=h(d1,d2); cout<<"输出结果:"<<endl; if(ds>=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<iostream.h> #include<string.h> 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 cout<<"Number:"<<number<<endl;cout<<"Name:"<<name<<endl;friend bool greaterthan(Student &st1,Student &st2); bool greaterthan(Student &st1,Student &st2) return st1.number>st2.number;/返回成员number的比较结果int 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;i<5;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 <iostream>#include <string>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()cout<<"autor "<<author<<endl;cout<<"name "<<name<<endl;cout<<"price "<<sale<<endl;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 = iclass DC:private BCpublic:DC(int 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 <iostream>using namespace std;class Shapeint x,y;public:Shape(int ix,int iy)x = ix; y = iy;virtual void show()cout<<"pos: "<<x<<' '<<y<<endl;class Circle :public Shapeint radius;public:Circle(int ix,int iy,int r):Shape(ix,iy),radius(r)void show() Shape:show ();cout<<"circle: "<<radius<<endl;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 ();cout<<"width and higth: "<<width<<' '<<higth<<endl;int main()Shape s1(1,1);Rect r1(2,2,8,8);Circle c1(3,3,9);r1.show ();c1.show();return 0;5-11#include<iostream.h> 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 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: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; vehicle: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(2001,2000,5); 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 <iostream>using namespace std;class Mammalpublic:virtual void Speak()cout<<"in Mammal"<<endl;class Dog:public Mammalpublic:void Speak()cout<<"dog bark"<<endl;int main()Dog dog;Mammal *pM;pM = &dog;pM->Speak ();return 0;运行结果: dog bark6-7#include <iostream>using namespace std;class BaseClasspublic: virtual BaseClass()cout<<"destruct Base"<<endl;class Derived:public BaseClasspublic:Derived()cout<<"destruct derived"<<endl;int main()BaseClass *pbase;pbase = new Derived;delete pbase;结果将不能正常执行子类析构6-8 #include <iostream>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*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() 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 Trapezoid(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："<<AreaSum<<endl;cout<<"各三维图形面积如下："<<endl;cout<<"圆形:"<<pS1->Area()<<endl; cout<<"正方形:"<<pS2->Area()<<endl; cout<<"长方形:"<<pS3->Area()<<endl; cout<<"梯形:"<<pS4->Area()<<endl; cout<<"三角形:"<<pS5->Area()<<endl;return 0;6-9#include <iostream>using namespace std;class Studentpublic:virtual void show() = 0;class Junior :public Studentpublic:void show()cout<<"this would be info for junior students"<<endl;class Senior :public Studentpublic:void show()cout<<"this would be info for Senior students"<<endl;int main()Student *pstu;pstu = new Junior;pstu->show ();pstu = new Senior;pstu->show ();return 0;第七章7-1#include <iostream>#include <string>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;v1+=v2;v3.show();v1.show();return 0;7-2#include <iostream.h> class Complex private: 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); void Print();void Complex:Print()cout<<real<<" + "<<image<<"i"<<endl; 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 | image!=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)cout<<"c3 equals to c1"<<endl; else cout<<"c3 doesn?t equale to c1"<<endl;c3=-c2; c3.Print();c3+=c2;c3.Print();if(c3 != c1)cout<<"c3!=c1"<<endl;return 0;7-3#include <iostream>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 (m>0 && m<13)month=m;if (d>0 && d<32) day=d; if (y>0 && y<3000)year=y; Date& Date:operator+(int days)int i;for(i = days;i>0;)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(i>diff)i-= diff+1;day = 1;month+;if(month>12)year+;month = 1;elseday+= i;break;return *this;void Date:showDate()cout<<year<<"."<<month<<"."<<day<<endl;int main()Date obj(1996,1,1); obj.showDate ();obj = obj+59; obj.showDate(); return 0;7-4 以+，=为例#include<iostream>#include<string.h>using namespace std;class String char *sbuf; int length;public:String()length=0;sbuf=new char;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,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 &