面向?qū)ο驝++習題參考解答

面向?qū)ο驝++習題參考解答面向?qū)ο驝++習題參考解答面向?qū)ο驝++習題參考解答資料僅供參考文件編號：2022年4月面向?qū)ο驝++習題參考解答版本號：A修改號：1頁次：1.0審核：批準:發(fā)布日期：4-8定義一個Dog類，包含age,weight等屬性，以及對這些屬性操作的方法。實現(xiàn)并測試這個類。#include<iostream>usingnamespacestd;classDog{public: voidsetAge(inta) { age=a; } intgetAge() { returnage; } voidsetWeight(floatw) { weight=w; } floatgetWeight() { returnweight; }private: intage; floatweight;};voidmain(){ Dogd; (3); (30); cout<<"小狗："<<()<<"歲，重"<<()<<"斤。"<<endl;}4-9設計并測試一個名為Rectangle的矩形類，其屬性為矩形的左下角與右上角兩個點的坐標，根據(jù)坐標能計算矩形的面積。#include<iostream>#include<>usingnamespacestd;classRectangle{public: Rectangle(intxx1,intyy1,intxx2,intyy2) { x1=xx1; y1=yy1; x2=xx2; y2=yy2; } floatgetArea() { returnfabs(x2-x1)*fabs(y2-y1); }private: intx1,y1; intx2,y2;};voidmain(){ Rectanglerec(0,0,10,20); cout<<"矩形面積："<<()<<endl;}4-11定義并實現(xiàn)一個矩形類，有長、寬兩個屬性，由成員函數(shù)計算矩形的面積。#include<iostream>usingnamespacestd;classRectangle{public: Rectangle(intl,intw) { length=l; width=w; } floatgetArea() { returnlength*width; }private: intlength; intwidth;};voidmain(){ Rectanglerec(10,20); cout<<"矩形面積："<<()<<endl;}4-13定義一個Circle類，有數(shù)據(jù)成員radius（半徑），成員函數(shù)getArea()，計算圓的面積，構(gòu)造一個Circle的對象進行測試。#include<iostream>usingnamespacestd;constfloatPI=;classCircle{public: Circle(floatr) { radius=r; } floatgetArea() { returnradius*PI*PI; }private: floatradius;};voidmain(){ Circlec; cout<<"圓的面積："<<()<<endl;}4-20定義一個復數(shù)類Complex，使得下面的代碼能夠工作。Complexc1(3,5);Complexc2=;(c2);()

;<<endl; } ~Mammal() { cout<<"DesstructingMammal."<<endl; }};classDog:publicMammal{public: Dog() { cout<<"ConstructingDog."<<endl; } ~Dog() { cout<<"DesstructingDog."<<endl; }};voidmain(){ Dogd;}7-8定義一個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pageCount。#include<iostream>usingnamespacestd;classDocument{public: Document(char*n) { strcpy(name,n); } voidshow() { cout<<name; }private: charname[50];};classBook:publicDocument{public: Book(char*n,intp):Document(n),pageCount(p) { } voidshow() { cout<<"書名："; Document::show(); cout<<endl<<"頁數(shù)："<<pageCount<<endl; }private: intpageCount;};voidmain(){ Bookbook("C++語言程序設計",529); ();}7-10定義一個Object類，有數(shù)據(jù)成員weight及相應的操作函數(shù)，由此派生出Box類，增加數(shù)據(jù)成員height和width及相應的操作函數(shù)，聲明一個Box對象，觀察構(gòu)造函數(shù)與析構(gòu)函數(shù)的調(diào)用順序。#include<iostream>usingnamespacestd;classObject{public: Object() { cout<<"ConstructingObject."<<endl; } ~Object() { cout<<"DestructingObject."<<endl; } voidsetWeight(intw) { weight=w; } intgetWeight() { returnweight; }private: intweight;};classBox:publicObject{public: Box() { cout<<"ConstructingBox."<<endl; } ~Box() { cout<<"DestructingBox."<<endl; } voidsetHeight(inth) { height=h; } intgetHeight() { returnheight; } voidsetWidth(intw) { width=w; } intgetWidth() { returnwidth; }private: intheight; intwidth;};voidmain(){ Boxbox; (5); (10); (8); cout<<"盒子：高"<<()<<"，寬"<<()<<"，重"<<()<<endl;}8-4#include<iostream>usingnamespacestd;classCounter{public: Counter(intii=0) { i=ii; } voidprint() { cout<<"i="<<i<<endl; } Counteroperator+(inta) { Countertemp; =i+a; returntemp; }private: inti;};voidmain(){ Counterc; c=c+3; (); c=c+5; ();}8-5#include<iostream>usingnamespacestd;classMammal{public: virtualvoidspeak() { cout<<"MammalSpeak!"<<endl; }};classDog:publicMammal{public: virtualvoidspeak() { cout<<"DogSpeak!"<<endl; }};voidmain(){ Dogd; (); Mammal*p=&d; p->speak();}8-7#include<iostream>usingnamespacestd;classPoint{public: Point(intx=0,inty=0) { X=x; Y=y; } voidprint() { cout<<"("<<X<<","<<Y<<")"<<endl; } Point&operator