实验5-多态性与虚函数-程序.doc

实验5多态性和虚函数二.实验内容5・1 .cpp#inelude <iostream> using namespace std;#inelude <string> class Point{public:Point(int=0, int=0); virtual~Point(){} virtual void set(); virtual void display(); protected:int x,y;};Point::Point(int x, int y){ this->x=x;this->y=y;} void Point::set(){ cout«H Please en ter the in format! on of poin t(x, y):H ; cin> >x»y;}void Point::display(){ class Circle: public Point{public:Circle(int=O, int=0, int=0);~Circle(){}virtual void set(); virtual voiddisplay(); protected:int radius;};Circle::Circle(int x, int y, int radius):Point(x, y){ this->radius=radius; }void Circle::set(){ cout«,,Please en ter the in format! on of Circle(x, y, radius): cin»x»y»radius; }void Circle:: display!){ cout«H x=,,«x«" y=,,«y«n radius=H «radius«e ndl; } class Cylinder: public Circle〃圆柱体类 {public:Cylinder(int=O, int=0, int=0‘ int=0); 〃构造函数〃点类 〃构造函数〃析构函数〃虚函数 〃虚函数 〃坐标点 cout«,,x=,,«x«" y="«y«endl;} 〃圆类 〃构造函数 〃析构函数 〃重新定义熄函数 〃重新定义虚函数 〃圆半径~Cylinder(){}〃析构函数 virtual void set();〃重新定义虚函数 virtual void display));〃重新定义虚函数 protected:int height; 〃圆柱体的高 }；Cylinder::Cylinder(int x, int y, int radius, int height): Circle(x, y, radius) { this->height=height; }void Cylinder::set(){ cout«H Please enter the information of Cylinderfx, y, radius, height) :n ;cin> >x>>y»radius»height;} void Cylinder:: display(){ cout«l,x=,,«x«H y=H «y;cout «H radjus=,,«radius«H height=H «height«e ndl;}int main(){Point *p;〃定义基类指针 Point point;〃定义基类对象p=&poi nt;p->display();P->set(); p->display();Cylinder cylinder(O, 0, 3,10); 〃定义派生类对象 p= &cyli nder; p->display();p->set();p->display();return 0;} 5・ 2.cpp#include <iostream> using namespace std;#inelude <string> class Employee {public:Circle circlefO, 0, 3);p 二&circle;p->display();p->set();p->display();〃定义派生类对象〃职工类Employee(char *, char *); virtual~Employee(){} void setName();char* getNamef);void setlD();char* getlD(); virtual float pay()=O;virtual void print()=O; protected:char name[20];char id[20];Employee::Employee(char *name, char*id){ strcpy(this->name, name); strcpy(this->id, id);}void Employee:: setName(){cout «l,Please enter employee's name: H «endl;cin»n ame;}char* Employee:: getName(){ return name; } void Employee:: setlD() {cout «n Please enter employee's ID: H «endl; cin> >id;}char* Employee:: getlD(){ return id; } class Manager: public Employee {public:Manager(char *name 7 char *id, float salaryJiEmployeetname, id) {this->salary=salary;}^ManagerOOfloat pay(){ return salary;}void print(){ cout«endl«H name:”vvname«H ID: "«id«" pay: n «pay()«endl;} private: float salary;};class Technician: public Employee{public:Technician(char ame, char *id, int hours, float wage): Employee(name, id) { this->hours=hours; this->wage=wage; }~Technician(){}float pay(){return hours*wage;}void print)){ cout«endlvv 11 name: ”vvname«H ID: ,,«id«,' pay: n «pay()<vendl;} private:int hours;float wage;};〃构造函数 〃析构函数 〃修改姓名 〃获取姓名 〃修改工号 〃获取工号 〃计算职工的工资 〃输出职工的信息〃姓名 〃工号int main(){ Employee *p;Manager managerf'Zhang", "101", 9000);p=&ma nager;p->print();Technician technicianC'Zhang", "112", 8*29, 30);p=&tech nician;p->print();return 0;}5・ 3.cpp#inelude <cmath>#in clude<iostream>using namespace std;const double Pl=3.1415926535;class Shape 〃形状类{public:virtual void show()=0; 〃纯虚函数virtual double area()=0; 〃纯虚函数}；class Rectangle:public Shape 〃矩形类{public:Rectangle(){ length=0; width=0;}Rectangle(double len, double wid){ length= len; width = wid;}double area(){ return length*width;} 〃实现基类屮的纯虚函数area求矩形面积void show() 〃实现基类中的纯虚函数show输出矩形的长和宽{cout«"length="«length«,\t'«"width="«width«endl;}private:double length, width; 〃矩形的长和宽}；class Triangle: public Shape 〃三角形类{public:Triangle(){a=O; b=0; c=0;}Triangle(double x, double y, double z){ a = x; b = y; c = z; } double area()〃实现基类中的纯虚函数area 求三角形面积 { double s=(a+b+c)/2.0;return sqrt(s*(s-a)*(s-b)*(s-c));}void show()〃实现基类中的纯虚函数show 输出三角形的三边长 { cout«"a="«a«,\t'«"b="«b«'\t ,«"c="«c«endl; } private:double a, b, c; 〃三角形的三边长}；class Circle: public Shape 〃圆类{public:Circle(){radius = 0;}Circle(double r){radius = r;}double area() {return Pl*radius*radius;}〃实现基类中的纯虚函数area 求圆面积 void show(){cout«"radius="«radius«endl;}//实现基类中的纯虚函数show 输出圆半径 private:double radius; 〃圆半径}； void total(Shape *p[], int n) { double sum=0;for (int i=0; ivn; i++) sum+=p[i]->area();cout«"图形面积总和二"«sum«endl; } int main() 〃定义基类指针s 〃定义Circle 类对象c 〃定义Rectangle 类对象r〃定义Triangle 类对象t〃静态多态cout«"圆面积:"«c.area()«endl;s=&r;〃动态多态 s->show();coutvv”矩形面积:"«s->area()«endl; s=&t; 〃动态多态 s->show();cout«'三角形面"«s->area()«endl;Shape *p[]={&c, &r, &t}； 〃定义基类指针数组P ，使其每一个元素指向一个派生类对象 total(p,3); return 0;} Shape *s;Circle c(10);Rectangle r(6, 8); Triangle t(3, 4, 5); c.show();。