C++面向对象程序设计第六章课后习题答案(第2版-谭浩强)VIP

C++面向对象程序设计第六章课后习题答案(第2版—谭浩强)C++面向对象程序设计第六章课后习题答案(第2版—谭浩强)C++面向对象程序设计第六章课后习题答案(第2版—谭浩强)C++面向对象程序设计第六章课后习题答案(第2版—谭浩强)编制仅供参考审核批准生效日期地址：电话：传真:邮编:第六章课后习题答案（第二版谭浩强）1://xt6-1/cpp#include<iostream>//如用VC++应改为∶#include<>usingnamespacestd;//如用VC++应取消此行#include""#include""#include""#include""intmain(){Cylindercy1,,,10);cout<<"\noriginalcylinder:\nx="<<()<<",y="<<()<<",r="<<()<<",h="<<()<<"\narea="<<()<<",volume="<<()<<endl;(15);;(5,5);cout<<"\nnewcylinder:\n"<<cy1;Point&pRef=cy1;cout<<"\npRefasapoint:"<<pRef;Circle&cRef=cy1;cout<<"\ncRefasaCircle:"<<cRef;return0;}3:解法一#include<iostream>usingnamespacestd;classPoint{public:Point(floata,floatb):x(a),y(b){}~Point(){cout<<"executingPointdestructor"<<endl;}private:floatx;floaty;};classCircle:publicPoint{public:Circle(floata,floatb,floatr):Point(a,b),radius(r){}~Circle(){cout<<"executingCircledestructor"<<endl;}private:floatradius;};intmain(){Point*p=newCircle,,;deletep;return0;}3：解法二#include<iostream>usingnamespacestd;classPoint{public:Point(floata,floatb):x(a),y(b){}~Point(){cout<<"executingPointdestructor"<<endl;}private:floatx;floaty;};classCircle:publicPoint{public:Circle(inta,intb,intr):Point(a,b),radius(r){}~Circle(){cout<<"executingCircledestructor"<<endl;}private:floatradius;};intmain(){Point*p=newCircle,,;Circle*pt=newCircle,,;deletept;return0;}3：解法三#include<iostream>usingnamespacestd;classPoint{public:Point(floata,floatb):x(a),y(b){}virtual~Point(){cout<<"executingPointdestructor"<<endl;}private:floatx;floaty;};classCircle:publicPoint{public:Circle(floata,floatb,floatr):Point(a,b),radius(r){}virtual~Circle(){cout<<"executingCircledestructor"<<endl;}private:floatradius;};voidmain(){Point*p=newCircle,,;deletep;}4：#include<iostream>usingnamespacestd;//定义抽象基类ShapeclassShape{public:virtualdoublearea()const=0;//纯虚函数};//定义Circle类classCircle:publicShape{public:Circle(doubler):radius(r){}//结构函数virtualdoublearea()const{return*radius*radius;};//定义虚函数protected:doubleradius;//半径};//定义Rectangle类classRectangle:publicShape{public:Rectangle(doublew,doubleh):width(w),height(h){}//结构函数virtualdoublearea()const{returnwidth*height;}//定义虚函数protected:doublewidth,height;//宽与高};classTriangle:publicShape{public:Triangle(doublew,doubleh):width(w),height(h){}//结构函数virtualdoublearea()const{return*width*height;}//定义虚函数protected:doublewidth,height;//宽与高};//输出面积的函数voidprintArea(constShape&s){cout<<()<<endl;}//输出s的面积intmain(){Circlecircle;//建立Circle类对象circlecout<<"areaofcircle=";printArea(circle);//输出circle的面积Rectanglerectangle,;//建立Rectangle类对象rectanglecout<<"areaofrectangle=";printArea(rectangle);//输出rectangle的面积Triangletriangle,;//建立Triangle类对象cout<<"areaoftriangle=";printArea(triangle);//输出triangle的面积return0;}5：#include<iostream>usingnamespacestd;//定义抽象基类ShapeclassShape{public:virtualdoublearea()const=0;//纯虚函数};//定义Circle(圆形)类classCircle:publicShape{public:Circle(doubler):radius(r){}//结构函数virtualdoublearea()const{return*radius*radius;};//定义虚函数protected:doubleradius;//半径};//定义Square(正方形)类classSquare:publicShape{public:Square(doubles):side(s){}//结构函数virtualdoublearea()const{returnside*side;}//定义虚函数protected:doubleside;};//定义Rectangle(矩形)类classRectangle:publicShape{public:Rectangle(doublew,doubleh):width(w),height(h){}//结构函数virtualdoublearea()const{returnwidth*height;}//定义虚函数protected:doublewidth,height;//宽与高};//定义Trapezoid(梯形)类classTrapezoid:publicShape{public:Trapezoid(doublet,doubleb,doubleh):top(t),bottom(t),height(h){}//结构函数virtualdoublearea()const{return*(top+bottom)*height;}//定义虚函数protected:doubletop,bottom,height;//上底、下底与高};//定义Triangle(三角形)类classTriangle:publicShape{public:Triangle(doublew,doubleh):width(w),height(h){}//结构函数virtualdoublearea()const{return*width*height;}//定义虚函数protected:doublewidth,height;//宽与高};intmain(){Circlecircle;//建立Circle类对象circleSquaresquare;//建立Square类对象squareRectanglerectangle,;//建立Rectangle类对象rectangleTrapezoidtrapezoid,,;//建立Trapezoid类对象trapezoidTriangletriangle,;//建立Triangle类对象Shape*pt[5]={&circle,&square,&rectangle,&t