C實驗報告-實驗5多態(tài)性與虛函數(shù)

1、實驗5 多態(tài)性與虛函數(shù)一、實驗?zāi)康暮鸵罅私忪o態(tài)聯(lián)編和動態(tài)聯(lián)編的概念。掌握動態(tài)聯(lián)編的條件。二、實驗內(nèi)容和原理事先編寫好程序，上機調(diào)試和運行程序，分析結(jié)果。（1）實驗指導(dǎo)書P96 14任選一題。（2）實驗指導(dǎo)書P100 56任選一題。三、實驗環(huán)境聯(lián)想計算機，Windows XP操作系統(tǒng)，Visual C+ 6.0四、算法描述及實驗步驟（1）編寫源程序。（2）檢查程序有無錯誤(包括語法錯誤和邏輯錯誤)，有則改之。（3）編譯和連接，仔細分析編譯信息，如有錯誤應(yīng)找出原因并改正之。（4）運行程序，分析結(jié)果。（5）將調(diào)試好的程序保存在自己的用戶目錄中，文件名自定。五、調(diào)試過程12六、實驗結(jié)果15七、總結(jié)動

2、態(tài)聯(lián)編需要滿足3個條件，首先類之間滿足類型兼容規(guī)則；第二是要聲明虛函數(shù)；第三是要由成員函數(shù)來調(diào)用或者是通過基類指針、引用來訪問虛函數(shù)。附錄：1 public:virtual void f(float x)coutBase:f(float)xendl;void g(float x)coutBase:g(float)xendl;void h(float x )coutBase:h(float)xendl;class Derived:public Basepublic:virtual void f(float x)coutDerived:h(float)xf(3.14f);pb-f(3.14f);p

3、b-g(3.14f);pb-h(3.14f);pb-h(3.14f);return 0;2#includeusing namespace std;#includeclass Teacherpublic:Teacher(string n,int h);virtual double salary()=0;virtual void print()=0;protected:string name;int lessons;Teacher:Teacher(string n,int h)name=n;lessons=h;class Professor:public Teacherpublic:Profess

4、or(string n,int h):Teacher(n,h)double salary()return 5000 + 50 * lessons;void print();void Professor:print()coutnametProfessorttlessonslessons;couttearned ￥salary()endl; class Associateprofessor:public Teacherpublic:Associateprofessor(string n,int h):Teacher(n,h)double salary()return 3000+30*lessons

5、;void print();void Associateprofessor:print()coutna#includeusing namespace std;#includeclass Teacherpublic:Teacher(string n,int h);virtual double salary()=0;virtual void print()=0;protected:string name;int lessons;Teacher:Teacher(string n,int h)name=n;lessons=h;class Professor:public Teacherpublic:P

6、rofessor(string n,int h):Teacher(n,h)double salary()return 5000 + 50 * lessons;void print();void Professor:print()coutnametProfessorttlessonslessons;couttearned ￥salary()endl; class Associateprofessor:public Teacherpublic:Associateprofessor(string n,int h):Teacher(n,h)double salary()return 3000+30*l

7、essons;void print();void Ass metAssociateprofessortlessonslessons;couttearned ￥salary()endl;class Lecturer:public Teacherpublic:Lecturer(string n,int h):Teacher(n,h)double salary()return 2000+20*lessons;void print();void Lecturer:print()coutnametLecturerttlessonslessons;couttearned ￥salary()endl;int main()Teacher * t3;t0=new Professor(Tang XiHua,1