面向对象C习题参考解答

1、4-8概念一个Dog类，包括age,weight等属性，和对这些属性操作的方式。实现并测试那个类。#includeusingnamespacestd;classDogpublic:voidsetAge(inta)age=a;intgetAge()returnage;voidsetWeight(floatw)weight=w;floatgetWeight()returnweight;private:intage;floatweight;void main()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

2、角与右上角两个点的坐标，依照坐标能计算矩形的面积。#include#includeusingnamespacestd;classRectanglepublic: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概念并实现一个矩形类，有长、宽两个属性，由成员函数计算矩形的

3、面积。#includeusingnamespacestd;classRectanglepublic: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概念一个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。#includeusingnamespacestd;constfloat

4、PI=;classCirclepublic:Circle(floatr)radius=r;floatgetArea()returnradius*PI*PI;private:floatradius;voidmain()Circlec;cout圆的面积：()endl;4-20概念一个复数类Complex,使得下面的代码能够工作。Complexc1(3,5);Complexc2=;(c2);();endl;Mammal()coutDesstructingMammal.endl;classDog:publicMammalpublic:Dog()coutConstructingDog.endl;Dog(

5、)coutDesstructingDog.endl;void main()Dogd;7-8概念一个Document类，有数据成员name,从Document派生出Book类，增加数据成员pageCount。#includeusingnamespacestd;classDocumentpublic:Document(char*n)strcpy(name,n);voidshow()coutname;private:charname50;classBook:publicDocumentpublic:Book(char*n,intp):Document(n),pageCount(p)voidshow(

6、)cout书名：;Document:show();coutendl页数：pageCountendl;private:intpageCount;voidmain()Bookbook(C+语言程序设计,529);();7-10概念一个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，观看构造函数与析构函数的挪用顺序。#includeusingnamespacestd;classObjectpublic:Object()coutConstructingObject.endl;Object()coutD

7、estructingObject.endl;voidsetWeight(intw)weight=w;intgetWeight()returnweight;private:intweight;classBox:publicObjectpublic:Box()coutConstructingBox.endl;Box()coutDestructingBox.endl;voidsetHeight(inth)height=h;intgetHeight()returnheight;voidsetWidth(intw)width=w;intgetWidth()returnwidth;private:inth

8、eight;intwidth;voidmain()Boxbox;(5);(10);(8);cout盒子：高()，宽()，重()endl;8-4#includeusingnamespacestd;classCounterpublic:Counter(intii=0)i=ii;voidprint()couti=iendl;Counteroperator+(inta)Countertemp;=i+a;returntemp;private:inti;voidmain()Counterc;c=c+3;();c=c+5;();8-5#includeusingnamespacestd;classMammalpublic:virtualvoidspeak()coutMammalSpeak!endl;classDog:publicMammalpublic:virtualvoidspeak()coutDogSpeak!speak();8-7#includeusingnamespacestd;classPointpublic:Point(intx=0,inty=0)X=x;Y=y;voidprint()cout(X,Y)endl;Point&operator+()X+;