面向?qū)ο驝習(xí)題參考解答

1、4-8概念一個Dog類，包括age,weight等屬性，和對這些屬性操作的方式。實現(xiàn)并測試那個類。#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：()歲，重()斤。endl;4-9設(shè)計并測試一個名為Rectangle的矩形類，其屬性為矩形的左下

2、角與右上角兩個點的坐標(biāo)，依照坐標(biāo)能計算矩形的面積。#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矩形面積：()endl;4-11概念并實現(xiàn)一個矩形類，有長、寬兩個屬性，由成員函數(shù)計算矩形的

3、面積。#includeusingnamespacestd;classRectanglepublic: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概念一個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(jìn)行測試。#includeusingnamespacestd;constfloat

4、PI=;classCirclepublic:Circle(floatr)radius=r;floatgetArea()returnradius*PI*PI;private:floatradius;voidmain()Circlec;cout圓的面積：()endl;4-20概念一個復(fù)數(shù)類Complex,使得下面的代碼能夠工作。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。#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書名：;Document:show();coutendl頁數(shù)：pageCountendl;private:intpageCount;voidmain()Bookbook(C+語言程序設(shè)計,529);();7-10概念一個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Box類，增加數(shù)據(jù)成員height和width及相應(yīng)的操作函數(shù)，聲明一個Box對象，觀看構(gòu)造函數(shù)與析構(gòu)函數(shù)的挪用順序。#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()，寬()，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+;