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实验三：编写一个构造三角形的应用程序，让用户输入三角形三边的长度，然后程序确定这个三角形是直角三角形还是等边三角形。需要定义一个代表三角形的类和主函数。#includeusing namespace std;class Trigonprivate:int a;int b;int c;public:void set();void Trigon:set()cina;cinb;cinc;int main()Trigon t1;int a,b,c;t1.set();if(a+b)=c|(a+c)=b|(b+c)=a) cout不能构成三角形endl;elseif(a*a+b*b)=c*c|(b*b+c*c)=a*a|(a*a+c*c)=b*b) cout构成直角三角形endl; if(a=b|b=c|a=c) cout构成等边三角形endl;return 0;实验四：电子时钟#includeusing namespace std;class Timepublic:Time()hour=0;minute=0;sec=0;Time operator+();void set_time();void show_time();private:int hour;int minute;int sec;void Time:set_time()cinhour;cinminute;cinsec;void Time:show_time()couthour:minute:sec=60)sec-=60;+minute;if(minute=60)minute=minute-60;hour+=1;if(hour=12)hour=hour-12;return*this;int main()Time t1;t1.set_time();for(int i=0;i60;i+)+t1;t1.show_time();return 0;实验五：创建点类 Point ，包含两个数据成员x，y和构造函数、析构函数，获取x，y值的函数等。 为point类添加一个友元函数，使其能计算两点间的距离。#include#includeusing namespace std;class Pointprivate:int x;int y;public:void set();void display();friend float Distance(Point&a,Point&b); /友元函数声明Point();Point();Point:Point()x=0;y=0;float Distance(Point&p1,Point&p2) /友元函数定义，形参double m=double(p1.x-p2.x); double n=double(p1.y-p2.y);return float(sqrt(m*m+n*n);void Point:set()cinx;ciny;void Point:display()coutxendl;coutyendl;int main()Point p1,p2;p1.set();p2.set();p1.display();p2.display();coutDistance(p1,p2)endl;return 0;实验六：重载双目运算符#include class Timepublic: Time()minute=0;sec=0; Time(int m,int s):minute(m),sec(s) Time operator+(); /声明前置自增+重载函数 Time operator+(int); /声明后置自增+重载 friend istream&operator(istream&,Time&); friend ostream&operator=60) sec-=60; +minute; return *this;Time Time:operator+(int)Time temp(*this); /保存当前对象 sec+; if (sec=60) sec-=60; +minute;return temp;istream&operator(istream&input,Time&t)inputt.minutet.sec;return input; ostream&operator(ostream&output,Time&t)outputt.minutet.secendl; return output; int main()Time time1(34,59),time2; cout time1 : ; couttime1endl; +time1; cout+time1: ; cout time1endl; time2=time1+; couttime1+: ; couttime1endl; cout time2 : ; cout time2endl; return 0; 实验七：重载单目运算符#includeusing namespace std;class Pointprivate:int x;int y;public:void set();void display();Point();Point operator+();Point operator-();Point:Point()x=0;y=0;void Point:set()cinx;ciny;void Point:display()coutxendl;coutyendl;Point Point:operator+()x=x+1;y=y+1;return *this;Point Point:operator-()x=x-1;y=y-1;return *this;int main()Point p1;p1.set();p1.display();+p1;p1.display();-p1;p1.display();return 0;实验八：定义基类point,它包含两个整型数据成员x、y 和一个成员函数display()，输出其坐标值; 把圆circle定义为点point类的派生类，它在点point的基础上增加一个数据成员radius； 并增加输出成员函数 display()用于输出圆心坐标和半径的值；求面积成员函数area()，求出该圆的面积。#includeusing namespace std;class Pointprotected:int x;int y;public:void set()cinxy;void display()cout(x,y)r;void display1() display();coutr 3.14*r*rendl;double area()return(3.14*r*r); ;int main()circle circle1;circle1.set1();circle1.display1();return 0;实验九：将5.8节程序补充完整，在程序中使用继承和组合。#include /习题5-10#include using namespace std;class Teacher /教师类 public: Teacher(int,char ,char); /声明构造函数 void display(); /声明输出函数 private: int num; char name20; char sex; ;Teacher:Teacher(int n,char nam,char s) num=n; strcpy(name,nam); sex=s;void Teacher:display() /定义输出函数 coutnum:numendl; coutname:nameendl; coutsex:sexendl;class BirthDate /生日类 public: BirthDate(int,int,int); /声明构造函数 void display(); /声明输出函数 void change(int,int,int); /声明修改函数 private: int year; int month; int day;BirthDate:BirthDate(int y,int m,int d) /定义构造函数 year=y; month=m; day=d; void BirthDate:display() /定义输出函数 coutbirthday:month/day/yearendl; void BirthDate:change(int y,int m,int d) /定义修改函数 year=y; month=m; day=d; class Professor:public Teacher/教授类 public: Professor(int,char ,char,int,int,int,float); /声明构造函数 void display(); /声明输出函数 void change(int,int,int); /声明修改函数 private: float area; BirthDate birthday; /定义BirthDate类的对象作为数据成员 ;Professor:Professor(int n,char nam20,char s,int y,int m,int d,float a):Teacher(n,nam,s),birthday(y,m,d),area(a) /定义构造函数void Professor:display() /定义输出函数Teacher:display(); birthday.display(); coutarea:areaendl;void Professor:change(int y,int m,int d) /定义修改函数 birthday.change(y,m,d); int main()Professor prof1(3012,Zhang,f,1949,10,1,125.4); /定义Professor对象prof1 coutendloriginal data:endl; prof1.display(); /调用prof1对象的display函数 coutendlnew data:endl; prof1.change(1950,6,1); /调用prof1对象的change函数 prof1.display(); return 0;实验十：根据提示，设计相关的各个类。#include class Pet public: virtual void speak() cout不知哪种动物，让我如何学叫？endl; ; class Mouse:public Petpublic:virtual void speak() cout我叫Jerry，是一只老鼠，我的叫声是：吱吱吱！endl; public:Mouse(char n30) name20=n30; private: char name30;class Cat:public Petpublic:virtual void speak() cout我叫Tom，是一只猫，我的叫声是：喵喵喵! endl;Cat(char n30)name30=n30;private:char name30;class Dog:public Petpublic:virtual void speak() cout我叫Droopy，是一条狗，我的叫声是：汪汪汪！ endl; Dog(char n30) name30=n30;private:char name30;class Giraffe:public Petpublic:virtual void speak() cout我叫Gill，是长颈鹿，脖子太长，发不出声音来！ speak(); /输出: 不知哪种动物，让我如何学叫？ Mouse m1(Jerry); p=&m1; p- speak(); /输出: 我叫Jerry，是一只老鼠，我的叫声是：吱吱吱！ Cat c(Tom); p=&c; p- speak(); /输出: 我叫Tom，是一只猫，我的叫声是：喵喵喵！ Dog d1(Droopy); p=&d1; p- speak(); /输出: 我叫Droopy，是一条狗，我的叫声是：汪汪汪！ Giraffe g(Gill); p=&g; p- speak(); /输出: 我叫Gill，是长颈鹿，脖子太长，发不出声音来！ return 0; 实验十一：在例题6.4的基础上 添加一point类的派生类rectangle。为其添加数据成员width、 length 和成员函数 area() .并把area加入虚函数序列.#include class Shapepublic: virtual float area() constreturn 0.0; virtual float volume() constreturn 0.0; virtual void shapeName() const =0;class Point:public Shapepublic: Point(float x=0,float y=0); void setPoint(float,float); float getX() const return x; float getY() const return y; virtual void shapeName() const coutPoint:; friend ostream &operator (ostream &,const Point &);protected: float x,y;Point:Point(float a,float b) x=a;y=b;void Point:setPoint(float a,float b) x=a;y=b;ostream &operator (ostream &output,const Point &p) outputp.x,p.y; return output;class Circle:public Pointpublic: Circle(float x=0,float y=0,float r=0); void setRadius(float); float getRadius() const; virtual float area() const; virtual void shapeName() const coutCircle:; friend ostream & operator(ostream &,const Circle &);protected: float radius;Circle:Circle(float x,float y,float r):Point(x,y),radius(r)void Circle:setRadius(float r)radius=r;float Circle:getRadius() const return radius;float Circle:area() const return 3.14159*radius*radius;ostream & operator (ostream &output,const Circle &c) outputc.x,c.y,r=c.radius; return output;class Cylinder:public Circlepublic: Cylinder(float x=0,float y=0,float r=0,float h=0); void setHeight(float); virtual float area() const; virtual float volume() const; virtual void shapeName() const coutCylinder:; friend ostream & operator (ostream &,const Cylinder &);protected: float height;Cylinder:Cylinder(float a,float b,float r,float h):Circle(a,b,r),height(h)void Cylinder:setHeight(float h)height=h;float Cylinder:area() const return 2*Circle:area()+2*3.14159*radius*height;float Cylinder:volume() const return Circle:area()*height;ostream & operator(ostream &output,const Cylinder &cy) outputcy.x,cy.y,r=cy.radius,h=cy.height; return output;class Rectangle:public Pointpublic: Rectangle(float l=0,float w=0); void setLength(float); float getLength() const; void setWidth(float); float getWidth() const; virtual float area() const; virtual void shapeName() const coutRectangle:; friend ostream & operator(ostream &,const Rectangle &);protected: float length,width;Rectangle:Rectangle(float l,float w):length(l),width(w)void Rectangle:setLength(float l)length=l;float Rectangle:getLength() const return length;