第十周实验报告 任务三（改）

源程序：

#include<iostream>#include<Cmath>//#define P 3.14  宏定义是c语言里的····const double P = 3.14;//c++应该用constusing namespace std;class Point //定义坐标点类{protected:double x, y;   //点的横坐标和纵坐标public:Point(){x=0;y=0;}Point(double x0, double y0);~Point();double getx();double gety();};  class Circle: public Point//定义圆类{protected:double r;//定义圆的半径public:Circle(){x=0; y=0; r=0;}Circle(double x0, double y0, double r0);~Circle();double getr();double Area();double Grith();};class Cylinder:public Circle//定义圆柱类{protected:double h;//定义圆柱类的高public:Cylinder(){x=0; y=0; r=0; h=0;}Cylinder(double x0, double y0, double r0, double h0);~Cylinder();double geth();double Volume();double WArea();friend istream& operator >> (istream& input, Cylinder &c1);friend ostream& operator << (ostream& output, Cylinder &c1);};Point::Point(double x0, double y0):x(x0), y(y0){}Point::~Point(){}double Point::getx(){return x;}double Point::gety(){return y;}Circle::Circle(double x0, double y0, double r0):Point(x0, y0),r(r0){}Circle::~Circle(){}double Circle::getr(){return r;}double Circle::Area(){return P * getr() * getr();}double Circle::Grith(){return P * getr() * 2;}Cylinder::Cylinder(double x0, double y0, double r0, double h0):Circle(x0, y0, r0), h(h0){}Cylinder::~Cylinder(){}double Cylinder::geth(){return h;}double Cylinder::Volume(){return Area() * h;}double Cylinder::WArea(){return (2 * Area() + Grith() * h);}istream& operator >> (istream& input, Cylinder &c1){char f;while(1){cout << "请输入一个圆柱底面○的圆心坐标(x和y之间用','隔开):";input >> c1.x >> f >> c1.y;if(f != ','){cout << "输入格式有误。。。" << endl;}elsebreak;}cout << "请输入一个圆柱底面○的半径:";input >> c1.r;cout << "请输入一个圆柱的高:";input >> c1.h;return input;}ostream& operator << (ostream& output, Cylinder &c1){output << "圆柱底面○的圆心为:" << "(" << c1.getx() << "," << c1.gety() << ")" << endl;output << "圆柱底面○的半径为:" << c1.getr() << endl;output << "圆柱底面○的面积为:" << c1.Area() << endl;output << "圆柱底面○的周长为:" << c1.Grith() << endl;output << "圆柱的高为:" << c1.geth() <<endl;output << "圆柱的表面积为:" << c1.WArea() << endl;output << "圆柱的体积为:" <<c1.Volume() << endl;return output;}int main(){Cylinder c;cin >> c;cout << c;system("pause");return 0;}

截图：