對于繼承關系 // Inherit_Point.cpp : Defines the entry point for the console application. //#include "stdafx.h" #include<iostream> #include<stdlib.h> using namespace std;/*****************************Point**************************************/ class Point {friend ostream&operator<<(ostream&, Point&); public:Point();Point(double xval, double yval);~Point();protected:double x;double y;}; Point::Point():x(0.0),y(0.0)//默認構造 { } Point::Point(double xval, double yval) : x(xval), y(yval)//普通構造 { } Point::~Point() { } ostream& operator<<(ostream& os, Point& apoint) {os << "Point :x:y " << apoint.x << ", " << apoint.y << "\n";return os; }/********************************Circle*********************************/ class Circle:public Point {friend ostream& operator<<(ostream&, Circle&);public:Circle();Circle(double r, double xval, double yval);~Circle();double area() { return (3.1415926*radius*radius); }protected:double radius; };Circle::Circle():Point(),radius(0.0) { } Circle::Circle(double r, double xval, double yval) : Point(xval, yval), radius(r) {} Circle::~Circle() { } ostream& operator<<(ostream& os, Circle& aCircle) {os << "Circle:radius: " << aCircle.radius;os << aCircle.x << "\n";//x,y是繼承而來的成員,由于是保護類成員，可以直接使用，若果是私有成員，則必須使用共有函數借口進行訪問os << aCircle.y << "\n";return os; }/************************************Cylinder*****************************************/ class Cylinder:public Circle {friend ostream& operator<<(ostream&, Cylinder&); public:Cylinder();Cylinder(double hv, double rv, double xv, double yv);double area() { return 2 * Circle::area() + 2 * 3.1415926*radius*radius; }~Cylinder();private: protected:double height; };Cylinder::Cylinder():Circle(),height(0.0) { } Cylinder::Cylinder(double hv, double rv, double xv, double yv) : Circle(xv, yv, rv), height(hv) { } Cylinder::~Cylinder() { } ostream& operator<<(ostream& os, Cylinder& acylinder) {os << "cylinder dimensions: ";os << "x: " << acylinder.x;os << ", y: " << acylinder.y;os << " , radius: " << acylinder.radius;os << ", height: " << acylinder.height << endl;return os; }/*****************************************main()**********************************************/ int main() {Point p(2.0, 3.0);Circle c(7.0, 6.0, 5.0);Cylinder cyl(10.0, 11.0, 12.0, 13.0);cout << p;cout << c;cout << "area circle: " << c.area() << endl;cout << cyl;cout << "area cylinder: " << cyl.area() << endl;cout << "aera cylinder base is: "<< cyl.Circle::area() << endl;system("pause");return 0; }

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