编写一个三角形类数据成员

classDate{public:Date(int=1900,int=1,int=1);voidShowDate();Dateoperator++();//前置单目运算符重载Dateoperator+

#includeusingnamespacestd;classA{doublelengh,width,height;public:A(){lengh=width=height=0;}voidinput

#include#includeusingstd::cout;usingstd::cin;usingstd::endl;usingstd::string;classBook{public:Book(s

//ConsoleApplication4.cpp:定义控制台应用程序的入口点.//#include"stdafx.h"#includeusingnamespacestd;classcMyRect{p

Date();Date(Date&d);Date(constchar*input);Date(inty,intm=2,intd=29);voidsetDate(constchar*input);voi

classCircle{public:Circle(intnr){r=nr;}Circle(){}public:intr;intArea(){return3.14*r*r;}};classB{publ

#includeclassCat{public:Cat(){HowManyCats++;}private:staticintHowManyCats;public:staticintGetHowMany

classTriangle{private:\x05doublea;\x05doubleb;\x05doublec;public:\x05Triangle():a(0),b(0),c(0){}\x05

#includeusingnamespacestd;classcat{public:cat();virtual~cat();public:floatweight;staticinthowmany

classComplex{public:Complex(){real=0;imag=0;}//定义结构函数Complex(doubler,doublei){real=r;imag=i;}//构造函数重

classcircle{floatradius;floatarea;public:circle(floatr){radius=r;}floatgetarea(void){area=3.14*radiu

把这三个类分别放到三个.java文件中,然后编译运行即可.publicclassCircle{privatedoubler;publicCircle(doubler){this.r=r;}public

classCat{privateintnumofcats;publicintgetnumofcats(){returnnumofcats;}}

在此基础上派生出矩形类CRectangle和圆类CCircle.//矩形类包括左上角坐标、长和宽等数据成员及相关的成员函数（如计算面积、周长、显示矩形的属性值等）.//圆类包括圆心坐标、半径等数据成员

#include#includeusingnamespacestd;classCircle{public:\x05Circle(){}\x05Circle(Circle&c)\x05{\x05\x05

#include#includeusingnamespacestd;classPoint//Point类定义{public://外部接口Point(intxx=0,intyy=0){X=xx;Y=yy

#includeclasscircle{private:intr;public:voidinput(){cout

#include#definePI3.14159usingnamespacestd;classcircle{private:doubleRadius;public:voidjiandan();};vo

1a2a3d

1)Youdon'tneedamemberfunction2)Youdon'tevenneedamembervariable3)Aclasscanbeempty再问：ok，Iunderstand，th