《第三次上机报告》由会员分享，可在线阅读，更多相关《第三次上机报告（9页珍藏版）》请在金锄头文库上搜索。
1、实验三学号：姓名：班级：软件工程141继承与派生(4学时)一、实验目的1 学习定义和使用类的继承关系，定义派生类。2 熟悉不同继承方式下对基类成员的访问控制。3学习利用虚基类解决二义性问题。二、实验任务1 .定义一个基类Animal,有私有整型成员变量age,构造其派生类dog,在其成员函数SetAge(intn)中直接给age赋值，看看会有什么问题，把age改为公有成员变量，还会有问题吗编程试试看。2 .定义一个基类BaseClass有整型成员变量Number,构造其派生类DerivedClass,观察构造函数和析构函数的执行情况。3 .分析并调试以下程序运行结果，并和实际运行结果相对照。#
2、includeusingnamespacestd;classBaseintx;public:Base(inti)x=i;coutConstuctorofBaseendl;Base()coutDestuctorofBaseendl;voidshow()coutx=xendl;classDerived:publicBaseBased;public:Derived(inti):Base(i),d(i)coutConstuctorofDerivedendl;Derived（）coutDestuctorofDerived:prror49?:cinnutoezkiwinhprin匚】口，与G:3.iscp
3、p（6:0dec1JrJttonof,叫.1.cpp（1l!：error1age*:cannolLaccessprivatenemberdleclaredinclassnniiwL*.Cpp（A:事”rieclnF*s将age设置为公有成员时，能正常运行代码：#includeusingnamespacestd;classAnimalpublic:intage;classdog:publicAnimalpublic:intsetAge(intn)age=n;returnage;intmain()dogd;cout(3)endl;return0;运行结果为：2 .执行情况为：(1)基类BaseCl
4、ass的构造函数;(2)派生类DerivedClass的构造函数;(3)派生类DerivedClass的析取函数;(4)基类BaseClass的析取函数；代码：#includeusingnamespacestd;classBaseClasspublic:BaseClass()Number=90;coutconstructorofBaseClass!endl;BaseClass()coutdestructorofBaseClass!endl;private:intNumber;；classDerivedClass:publicBaseClasspublic:DerivedClass()coutc
5、onstrctorofDerivedClass!endl;DerivedClass()coutdestructorofDerivedClass!endl;intmain()DerivedClassder;return0;执行结果：3 .分析：(1)执行Base的构造函数;(2)执行Derived的对象obj的Base类构造函数，并将obj(5)中参数5赋值给X及Derived类构造函数；Base析取函数，最后执行与第一步相对应的Base的析取函数;(3)执行Derived类的对象obj的Derived的析取函数、在执行Derived类的obj的执行结果:CumttuccorofCans*tij
6、ctnr-o:fGonhstucorofM=Sa”4 .虚基类：使得在继承间接共同基类时只保留一份成员。若不使用虚基类，在最终的派生类中会保留该间接共同基类数据成员的多份同名成员。代码：#includeusingnamespacestd;classvehiclepublic:vehicle(floatm,floatw)MaxSpeed=m;Weight=w;vehicle()voidrun()coutrunningofvehicle!endl;voidstop()coutstoppingofvehicle!endl;floatMaxSpeed;floatWeight;classbicycle:
7、virtualpublicvehiclepublic:bicycle(floatm,floatw,floath):vehicle(m,w)Height=h;bicycle()floatHeight;classmotorcar:virtualpublicvehiclepublic:motorcar(floatm,floatw,ints):vehicle(m,w)SeatNum=s;motorcar()intSeatNum;；classmotorcycle:publicbicycle,publicmotorcarpublic:motorcycle(floatm,floatw,floath,ints
8、):vehicle(m,w),bicycle(m,w,h),motorcar(m,w,s)motorcycle()voiddisplay。coutMaxSpeed=MaxSpeedendl;coutWeight=Weightendl;coutHeight=Heightendl;coutSeatNum=SeatNumendl;voidmain()floatm,w,h;ints;coutm;coutw;couth;couts;motorcyclemoc(m,w,h,s);();in put haxSpaed=SG , 7 height =70.8 Height-179.5 pvdit MixS p
9、w*d-?S6 - 7 府珀趾尸9 Height=179.5 s mu二，5 B卧日&零 any 限Hy to cont IntiH运行结果LI5 .代码：#include#includeusingnamespacestd;classPeoplepublic:People(stringn,strings,stringb,stringi)number=n;sex=s;birthday=b;id=i;People()protected:stringnumber;stringsex;stringbirthday;stringid;classStudent:virtualpublicPeoplepub
10、lic:Student(stringn,strings,stringb,stringi,stringc):People(n,s,b,i)classNo=c;Student()protected:stringclassNo;classTeacher:virtualpublicPeoplepublic:Teacher(stringn,strings,stringb,stringi,stringp,stringd):People(n,s,b,i)principalship=p;department=d;Teacher()protected:stringprincipalship;/职务stringd
11、epartment;/部门;classGraduate:publicStudentpublic:Graduate(stringn,strings,stringb,stringi,stringc,stringsu,stringt):People(n,s,b,i),Student(n,s,b,i,c)subject=su;teacher_adviser=t;Graduate()protected:stringsubject;/专业stringteacher_adviser;/导师;classTA:publicGraduate,publicTeacherpublic:TA(stringn,strings,stringb,stringi,stringc,stringsu,stringt,stringp,stringd):People(n,s,b,i),Graduate(n,s,b,i,c,su,t),Teacher(n,s,b,i,p,d)TA()voiddisplay()cout编号:numberend
