定义一个圆类,成员函数包括求圆面积,求圆周长,显示圆的半径和圆心坐标.

#include#includeusingnamespacestd;classComplex{floatm_Real;floatm_Image;public:Complex(floatr=0.0,fl

#includeusingnamespacestd;classtree{intages;public:tree(inta=0){ages=a;}voidgrow(intyears){ages+=yea

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

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

#includeusingnamespacestd;classRectangle{protected:doublelength,width;public:Rectangle(doublea,doubl

#includeusingnamespacestd;classcircle{private:doubleradius;public:circle(doubler=0.0);voidinput();do

以下程序,直接拿去交作业吧,都测试过了.//圆周长面积#include#definepi3.14159classcircle{public:voidsetRadius(){std::cout

publicclassScore{privateintnum;privatefloatmath;privatefloatenglish;publicfloatgetMath(){returnmath;

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

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

C++实现的复数类,代码如下//complex.cpp#includeusingnamespacestd;classcomplex{//复数类public:complex(doubler=0.0,do

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

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

classcircle{public:circle(){radius=0;}circle(doubleradiuv){radius=radiuv;}voidgetparimeter(){parimet

这个是pascal的做法programabcconstpai=3.14varR,Area:real;beginwriteln("pleaseinputanumberforr:");readln(r);

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

你的类定义在主函数里了,把它拿出来就行了

classCRect{public:CRect(intx,inty,intWidth,intHeight);voidSetSize(intWidth,intHeight);voidSetPos(int

出错的原因是,在初始化c2时,没有合适的构造函数.Circle类,你只定义了一个构造函数,就是带两个参数的.所以,修改的方法有2个1将Circlec1(p1,7),c2;这一行c2的部分改成c2(Po

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