面向?qū)ο驝習(xí)題參考解答

1、4-8定義一個(gè)Dog類，包含age,weight等屬性，以及對(duì)這些屬性操作的方法。實(shí)現(xiàn)并測(cè)試這 個(gè)類。#include <iostreain>using namespace std;class Dogpublic:void setAge(int a)age=a;mt getAgeQreturn age;void setWeight(float w)weight=w;float getWeightQreturn weight;private:nit age;float weight;void main()Dogd;d.setAge(3);d.setWeight(30);cout

2、71;M小狗:H«d.getAge()«"歲,重H«d.getWeight()«"斤。H«endl;4-9設(shè)計(jì)并測(cè)試一個(gè)名為Rectangle的矩形類，其屬性為矩形的左下角與右上角兩個(gè)點(diǎn)的坐 標(biāo)，根據(jù)坐標(biāo)能計(jì)算矩形的面積。#include <iostreain> #include <matli.h> using namespace std; class Rectanglepublic:Rectangle(int xxljnt vyLiiit xx2,iiit yv2)xl=xxl;yl=yyl;x2=

3、xx2;y2=yy2;float getAiea()return fabs(x2-xl)*fabs(y2-yl)；private:int xl,yl；mt x2,y2;void main()Rectangle iec(0Q 10,20); cout«,f矩形面積:H«rec.getAreaO«endl;4-11定義并實(shí)現(xiàn)一個(gè)矩形類，有長(zhǎng)、寬兩個(gè)屬性，由成員函數(shù)計(jì)算矩形的面積。#include <iostreain>using namespace std;class Rectanglepublic:Rectangle(int Lint w)length=

4、l;width=w;float getAiea()return length*width;private:int length;int width;；Rectangle rec(10,20); cout«M矩形面積：M«rec.getAreaQ«endl;4-13定義一個(gè)Ckcle類,有數(shù)據(jù)成員radius (半徑)，成員函數(shù)getAiea(),計(jì)算圓的面積, 構(gòu)造一個(gè)Circle的對(duì)彖進(jìn)行測(cè)試。#include <iostreain> using namespace std;const float PI=3.1415;class Ciiclepubl

5、ic:Circle(float 1)radius=r;float getAiea()return iadius*PI*PI;private:float radius;； void main()Circle c(5.5);cout«M圓的面積:H«c.getAiea()«endl;4-20定義一個(gè)復(fù)數(shù)類Complex,使得下面的代碼能夠工作。Complex cl(3、5);Complex c2=4.5;cl.add(c2);cl.show();/源程序如下：#include <iostreain>using namespace std;class Com

6、plexpublic:Complex(float r=O.O,float 1=0.0)real=r;miage=i;void add(Complex b)real=real+b.real;miage=miage+b .ullage;void show()cout«real«,'+H«iniage«,i"«endl;private:float real; 實(shí)部float image; 虎部；void main()Complex cl(3,5);Complex c2=45; 相當(dāng)于 Complex c2(4.5);cl.add(c

7、2);cl.show();5-7定義一個(gè)Cat類，擁有靜態(tài)數(shù)據(jù)成員numOfCats,記錄Cat的個(gè)體數(shù)目：靜態(tài)成員函數(shù) getNumOfCatsQ,讀取nuinOfCats。設(shè)計(jì)程序測(cè)試這個(gè)類，體會(huì)靜態(tài)數(shù)據(jù)成員和靜態(tài)成員函 數(shù)的用法。#include <iostreain> using namespace std; class Cat public:CatOnumOfCats-H-;Cat()numOfCats-;static mt getNumOfCatsQreturn numOfCats;private:static mt numOfCats;mt Cat:numOfCats

8、=0;void main()cout«M現(xiàn)在的 Cat 數(shù)量:,«Cat:getNumOfCats()«endl;Cat a;cout«M現(xiàn)在的 Cat 數(shù)量：y<agetNumOfCats()v<eudl;Cat b;cout«M現(xiàn)在的 Cat 數(shù)量：,«b.getNumOfCats()«endl;5-14定義Boat與Cai兩個(gè)類，二者都有weight屬性，定義二者的一個(gè)友元函數(shù) getTotalWeight(),計(jì)算二者的重量和。#include <iostreain>using namespa

9、ce std;class Cai;class Boatpublic:Boat(float w)weight=w;friend float getTotal7eight(Boat b,Car c);private:float weight;； class Caipublic:Car(float w)weight=w;friend float getTotalW7eight(Boat b,Car c);private:float weight;float getTotalWeight(Boat b,Car c)return b.weight+c.weight;void main()Boat boa

10、t(3500);Car car(1000);cout«M船和汽車共重"vvgetTotalW亡ight(boat，cai)<<”公斤。y<eiidl;7-5定義一個(gè)基類Shape,在此基礎(chǔ)上派生出Rectangle和Ciicle,二者都有g(shù)etAieaQ函數(shù)計(jì) 算對(duì)象的面積。使用Rectangle類創(chuàng)建一個(gè)派生類Square#include <iostreain> using namespace std;const float PI=3.14;class Shapepublic:Shape(float a,float b=0.0) tliis-

11、>a=a; tliis->b=b;protected:float a5b;；class Rectangle : public Shapepublic:Rectangle(float Lfloat w):Shape(l,w)float getAiea()return a*b;class Ciicle : public Shapepublic:Circle(float i):Shape(r)float getAiea()return a*PI*PI;class Square : public Rectanglepublic:Square(float l):Rectaiigle(lJ)f

12、loat getAiea()return a*a;void main()Rectangle r(10,20);Circle c(5);Square s(10);cout«M矩形的面積:"«r.getArea()«endl; cout«M圓的面積：M«c.getAiea()«endl;cout«M正方形的面積:"«s.getAiea()«endl; 7-6定義一個(gè)哺乳動(dòng)物類MaminaL再由此派生出狗類Dog,定義一個(gè)Dog類的對(duì)彖，觀察 基類與派生類的構(gòu)造函數(shù)和析構(gòu)函數(shù)的調(diào)用順序。#i

13、nclude <iostreain>using namespace std;class Manmialpublic:cout«MConstiiictmg Mammal. n«endl;Mammal()cout«MDesstiuctmg Maiiuiial.H«endl;class Dog : public Manmialpublic:Dog()cout«MConsti-uctmg Dog.M«endl;Dog()cout«"Desstructing Dog."«endl;；void

14、main()Dogd;7-8定義一個(gè)Document類，有數(shù)據(jù)成員name»從Document派生出Book類，增加數(shù)據(jù)成 員 pageCounto#include <iostreain>using namespace std;class Documentpublic:Document(char * n)strcpy(name.n);void show()cout«name;private:clw name 50;class Book : public Documentpublic:Book(char p):Document(n),pageCount(p)voi

15、d show()cout«H 書名：”；Document: :showQ;cout«endl«H頁(yè) 數(shù):H«pageCount«endl;private:int pageCount;void main()Book book(HC+ 語言程序設(shè)計(jì) ”,529);book.showQ;7-10定義一個(gè)Object類，有數(shù)據(jù)成員weight及相應(yīng)的操作函數(shù)，由此派生出Eox類，增加 數(shù)據(jù)成員hcght和width及相應(yīng)的操作函數(shù)，丙明一個(gè)Eox對(duì)彖，觀察構(gòu)造函數(shù)與析構(gòu)函數(shù)的調(diào)用順序。#include <iostreain>using na

16、mespace std;class Objectpublic:ObjectQcout«MConstiiictmg Object."«endl:-Object()cout«,Destructing Object. H«endl;void setWeight(mt w)weight=w;mt getWeight()return weight;private:int weight;class Box : public Objectpublic:BoxQcout«MConstiiictmg Box.M«endl;Eox0cout&#

17、171;,Destructing Box."«endl;void setHeight(iiit h)height=h;mt getHeightOreturn height;void setWidth(mt w)width=w;int getWidth()return width;private:int height;int width;void main()Box box;box.setHeight(5);box.setWidtli(lO);寬 H«box.getWidth()«H ,重box.setWeight(S);cout«M 盒子：高

18、H«box.getHeight()«"M«box.getWeight()«endl;8-4#include <iostreain> using namespace std; class Counter public:Counter(int ii=0)i="；void pnnt()cout«,i=,«i<<endl;Counter operator +(iiit a)Counter temp; temp.i=i+a; return temp;private:int i;；void main()

19、Counter c;c=c+3;c.pimtQ；c=c+5;c.pimtQ；8-5#include <iostreain>using namespace std;class Manmialpublic:virtual void speak()cout«MMaiiuiial Speak! M«endl;class Dog:public Maimnalpublic:virtual void speak()cout«MDog Speak! H«endl;void main()Dogd;d.speakQ;Mammal *p=&d; p->

20、;speak();8-7#include <iostreain>using namespace std;class Pointpublic:Pomt(int x=0jnt y=0)X=x;Y=y;void pnnt()cout«,(,'«X«,«Y«,)"«endl;Pomt& operator+()X+;Y+;return *tliis;Pomt opeiator-H-(iiit)Pomt temp=*this;X+;Y+;return temp;private:mt X,Y;void main()Pomt p;(+p).prmt();(p+).pimt();(+p).pimt();僅供個(gè)人用于學(xué)習(xí)、研究；不得用于商業(yè)用途。For personal use only in study and research； not for commercial use.Nur fur den person lichen fur Studien, Forsch ung, zu komm