写一个基类point 两个派生类rect circle

importjava.util.Scanner;publicclassPoint{privatedoublex;privatedoubley;publicPoint(){this(0,0);}publ

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

Inatwo-dimensionalCartesiancoordinatesystem,creatingapointclass,theclassnameisPoint,classLineisderiv

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#include#definePI3.14classPoint{public:Point(){x=0;y=0;}Point(floatx,floaty){this->x=x;this-

答案：ABC原因AB是C的基类,那么在堆栈里AB在C的下面.所以在构造时要先执行AB的构造函数再执行C的构造函数.同样的析构时要先执行C的析构函数在执行AB的析构函数.

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

如果想调用ABC的test就用a.ABC::test(1);想要XYZ的就用a.XYZ::test(1);voidmain(){childa;a.ABC::test(1);a.XYZ::test(1)

A.基类声明virtual后,所有派生类都继承得到了该虚函数.

//////////////////////////////////////////////////////////////////////////Point.h#include#includeusi

#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.

classPoint{public:Point();}classCircle:publicPoint{public:Circle();voidshow(){cout>>"Iamacircle">>en

#include#include#definePI3.14159usingnamespacestd;classShape{public:virtualdoublegetArea()=0;protect