定义一个Point类,派生出Circle类,计算派生类对象的面积.

#include <stdio.h>#include <stdlib.h>class Point{private: int _

Inatwo-dimensionalCartesiancoordinatesystem,creatingapointclass,theclassnameisPoint,classLineisderiv

#include"stdafx.h"#include#includeusingnamespacestd;classCShape{public:\x09virtualvoidArea()=0;\x09v

classpoint{floatx;floaty;public:point(floata,floatb){x=a;y=b;}floatgetx(){returnx;}floatgety(){retur

classpoint;classshape{public:virtualdoublecircumference()=0;virtualdoublearea()=0;};#definePI3.14159

usingSystem;namespaceAnimal{publicclassMainclass{publicstaticvoidMain(){Marmmalm=newMarmmal(10,50);D

朋友这个是C++的吧!classPoint{private:intm_nX;intm_nY;public://...}classCircle:publicPoint{private:intm_nR;p

class Point {public:    Point(int x, int y) {_x=x;

#include#includeusingnamespacestd;classPoint{private:doubleX,Y;public:Point(doublex,doubley){X=x;Y=y

用System.Drawing.Drawing2D.GraphicsPath比如GraphicsPath.AddLines(Point[]pts);GraphicsPathpath=newGraphi

classline:publicpoint{public:pointm_start;pointm_end;line();line();line(pointstart,pointend):m_start

#includeusingnamespacestd;#definePI3.14classPoint{public:\x09Point():m_x(0),m_y(0){}\x09Point(double

默认构造方法的意思是你自己没有定义构造方法,系统帮你定义一个楼主的意思应该是带参和无参构造方法吧?随便帮你写了一个通过输出可知,创建对象时先调用父类构造方法,再构造子类构造方法,而且,如果子类构造方法

简单写下了：#includeusingnamespacestd;classshape{//定义抽象类public:virtualvoidshow(){}};classcircle:publicshap

#includeusingstd::cout;usingstd::endl;#definePI3.14159structpoint{\x09intx,y;\x09point(int_x,int_y):

这是教程上的经典例子,多看书吧.

//#include#includeusingnamespacestd;classPoint{public:Point(double_x=0,double_y=0):x(_x),y(_y){cout

abstractclassShape{publicShape(){}publicfloatGetPerim(){return0;}}classRectangleextendsShape{private

不要提出这种问题,代码还是自己动手写的好,写的过程中遇到麻烦,再拿出来问的话,我想会有更多人乐意帮你解答的再问：来不及哦！！今天晚上要交！！没时间慢慢写！！我对c++也不是很熟！急求高手流利的给个程序

c#使用冒号“：”来指定基类,所以选B如下,表示派生类X,继承自YpublicclassX：Y{/////}