继承与派生实验报告

1、实验4 继承与派生班 级学号（最后两位）姓 名成 绩 一、实验目的1. 熟练掌握类的继承,能够定义和使用类的继承关系2. 掌握派生类的声明与实现方法3. 掌握类构造函数的初始化列表与作用域分辨率的使用方法4. 理解虚基类在解决二义性问题中的作用.二、实验内容1定义一个基类有姓名、性别、年龄，再由基类派生出教师类和学生类，教师类增加工号、职称和工资，学生类增加学号、班级、专业和入学成绩。2声明一个哺乳动物Mammal类，再由此派生出狗Dog类，声明一个Dog类的对象，观察基类与派生类的构造函数与析构函数的调用顺序。3定义一个Point类，派生出矩形类Rectangle和圆类Circle，计算各派

2、生类对象的面积Area()。4设计一个圆类circle和一个桌子类table，另设计一个圆桌类roundtable，它是从前两个类派生的，要求输出一个圆桌的高度、面积和颜色等数据。 5定义一个大学生类student，函数私有数据成员：姓名、学号、校名，并为它定义带参数的构造函数，参数带缺省值的构造函数和输出数据成员值的print()公有成员函数，另定义研究生类，它以公有继承方式派生于类student，新增加“研究方向、导师名”两个私有数据成员，并定义带参数的构造函数和输出研究生数据的print()公有成员函数。在main()函数中定义基类和派生类对象，对类进行测试。三、实验源程序、测试与结论1

3、#include<iostream.h>#include<string.h>class personpublic: person (char *a,char *b,int s) name=a; sex=b; score=s; void display() cout<<"姓名："<<name<<endl; cout<<"性别："<<sex<<endl; cout<<"年龄："<<score<<endl; p

4、rivate: char *name ; char *sex ; int score;class student:public personpublic: student(char *a,char *b,int s,char *c,int c2,float s1):person(a,b,s) pro=c; cla=c2; score=s1; void display1() cout<<"学生："<<endl; display(); cout<<"专业："<<pro<<endl; cout<

5、<"班级："<<cla<<endl; cout<<"成绩："<<score<<endl; cout<<endl; private: char *pro; int cla ; float score;class teacher: public personpublic: teacher(char *a,char *b,int s,char *p,int n,int sa):person(a,b,s) post=p; num=n; salary=sa; void display2(

6、) cout<<"教师："<<endl; display(); cout<<"工号："<<num<<endl; cout<<"职称："<<post<<endl; cout<<"工资："<<salary<<endl; cout<<endl; private: char *post ; int num; int salary; void main() teacher g1(&q

7、uot;小张","男",38, "老师",03,6742); g1.display2(); student s1("小李","男",19,"学生",04,85); s1.display1 ();2#include"iostream"using namespace std;class Mammalpublic:Mammal()cout<<"set Mammal class"<<endl;Mammal()cout<<

8、;"Delete base class"<<endl;class Dog:public Mammalpublic:Dog()cout<<"set Dog classn"Dog()cout<<"Delete Dog classn"void main()Dog b;3#include <iostream>using namespace std;#define PI 3.14class Pointpublic:Point() : m_x(0), m_y(0)Point(double x, do

9、uble y) : m_x(x), m_y(y)Point()protected:double m_x;double m_y;class Rectangle : public Pointpublic:Rectangle() : Point()Rectangle(double x, double y) : Point(x, y)Rectangle()double Area()return m_x * m_y;class Circle : public Pointpublic:Circle() : m_r(0)Circle(double r) : m_r(r)Circle()double Area

10、()return PI * m_r * m_r;private:double m_r;void main()double a,b,c;cout<<"输入矩形长、宽:n"cin>>a>>b;cout<<"输入圆的半径:n"cin>>c;Rectangle rect(a, b);Circle circle(c);cout << "矩形面积: " << rect.Area() << endl;cout << "圆的面积: &

11、quot; << circle.Area() << endl;4#include <iostream.h>#define PI 3.14class table;class circle;class roundtable : public table,public circlepublic: void iroundtable(double h,char *c,double r) heigh=h; radius=r; color=c; void display() cout<<"圆桌高度:"<<heigh<<

12、;endl; cout<<"圆桌面积: "<<PI*radius*radius<<endl; cout<<"圆桌颜色: "<<color<<endl; protected: double heigh,radius; char *color;void main() roundtable t; t.iroundtable(4,"blue",6); t.display();5#include"string"#include"iostream

13、"using namespace std;class Studentchar *name;char *number;char *college;public:Student();Student(char *p1,char *p2,char *p3);void print();Student:Student(char *p1,char *p2,char *p3)name=new charstrlen(p1)+1;strcpy(name,p1);number=new charstrlen(p2)+1;strcpy(number,p2);college=new charstrlen(p3)

14、+1;strcpy(college,p3);void Student:print()cout<<"name:"<<name<<endl;cout<<"number:"<<number<<endl;cout<<"college:"<<college<<endl;class graduate:public Studentchar *special;char *directorname;public:graduate();gradua

15、te(char *p1,char *p2,char *p3,char *sp,char *di);void print();graduate:graduate(char *p1,char *p2,char *p3,char *sp,char *di):Student(p1,p2,p3)special=new charstrlen(sp)+1;strcpy(special,sp);directorname=new charstrlen(di)+1;strcpy(directorname,di);void graduate:print()Student:print();cout<<"special is:"<<special<<endl;cout<<"directorname is:"<<directo