面向对象C++习题参考解答

面向对象C++习题参考解答面向对象C++习题参考解答面向对象C++习题参考解答资料仅供参考文件编号：2022年4月面向对象C++习题参考解答版本号：A修改号：1页次：1.0审核：批准:发布日期：4-8定义一个Dog类，包含age,weight等属性，以及对这些属性操作的方法。实现并测试这个类。#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："<<()<<"岁，重"<<()<<"斤。"<<endl;}4-9设计并测试一个名为Rectangle的矩形类，其属性为矩形的左下角与右上角两个点的坐标，根据坐标能计算矩形的面积。#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<<"矩形面积："<<()<<endl;}4-11定义并实现一个矩形类，有长、宽两个属性，由成员函数计算矩形的面积。#include<iostream>usingnamespacestd;classRectangle{public: Rectangle(intl,intw) { length=l; width=w; } floatgetArea() { returnlength*width; }private: intlength; intwidth;};voidmain(){ Rectanglerec(10,20); cout<<"矩形面积："<<()<<endl;}4-13定义一个Circle类，有数据成员radius（半径），成员函数getArea()，计算圆的面积，构造一个Circle的对象进行测试。#include<iostream>usingnamespacestd;constfloatPI=;classCircle{public: Circle(floatr) { radius=r; } floatgetArea() { returnradius*PI*PI; }private: floatradius;};voidmain(){ Circlec; cout<<"圆的面积："<<()<<endl;}4-20定义一个复数类Complex，使得下面的代码能够工作。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定义一个Document类，有数据成员name，从Document派生出Book类，增加数据成员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<<"书名："; Document::show(); cout<<endl<<"页数："<<pageCount<<endl; }private: intpageCount;};voidmain(){ Bookbook("C++语言程序设计",529); ();}7-10定义一个Object类，有数据成员weight及相应的操作函数，由此派生出Box类，增加数据成员height和width及相应的操作函数，声明一个Box对象，观察构造函数与析构函数的调用顺序。#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"<<()<<"，宽"<<()<<"，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