[YTU]_2918( Shape系列-4)

`Description`

小聪送给小亮和小华的形状他们都很喜欢,小亮和小华非要比一下他们两个的形状，来看看小聪更爱谁，请完成RsubC类。RsubC类中包括Rectangle类和Circle类的数据成员，新增布尔类型的数据成员sign（sign等于0时，新面积等于Rectangle+Circle，sign等于1时，新面积等于Rectangle-Circle），新定义了求面积的成员函数area()。但是小聪没有为RsubC类写构造函数和成员函数，请帮助小聪完成RsubC类。

小强写的文件头和Shape类

#include<iostream>#define PI 3.14using namespace std; class Shape{public: Shape();Shape(int c);int getcolor();double area();protected:int color;};Shape::Shape(){color=0;}Shape::Shape(int c){color=c;}int Shape::getcolor(){return color;}double Shape::area(){return 10000;}

小聪写的Rectangle类class Rectangle:public Shape{public:Rectangle(int c,double w,double h);double getwidth();double getheight();double area();double price();protected:double height;double width;};Rectangle::Rectangle(int c,double w,double h):Shape(c){width=w;height=h;}double Rectangle::getwidth(){return width;}double Rectangle::getheight(){return height;}double Rectangle::area(){return height*width;}double Rectangle::price(){return height*width*color;}

小聪写的Circle类

class Circle:public Shape{public:Circle(int c,double r);double getradius();double area();double price();protected:double radius;};

Circle::Circle(int c,double r):Shape(c){radius=r;}double Circle::getradius(){return radius;}

double Circle::area(){return PI*radius*radius;}double Circle::price(){return PI*radius*radius*color;}

小聪的测试函数：

int main()

{

RsubC rc=RsubC(1,2,3,1,1);cout<<"RsubC area:"<<rc.area()<<endl;return 0;

}

提示：不用提交全部程序，只提交补充部分。

`Input`

无

`Output`

输出小聪测试的RsubC的面积。

`Sample Output`

RsubC area:2.86

#include<iostream>#define PI 3.14using namespace std;class Shape{public: Shape(); Shape(int c); int getcolor(); double area();protected: int color;};Shape::Shape(){ color=0;}Shape::Shape(int c){ color=c;}int Shape::getcolor(){ return color;}double
Shape::area(){ return 10000;} class Rectangle:public Shape{public: Rectangle(int c,double w,double h); double getwidth(); double getheight(); double area(); double price();protected: double height; double width;};Rectangle::Rectangle(int c,double w,double
h):Shape(c){ width=w; height=h;}double Rectangle::getwidth(){ return width;}double Rectangle::getheight(){ return height;}double Rectangle::area(){ return height*width;}double Rectangle::price(){ return height*width*color;} class Circle:public Shape{public:
Circle(int c,double r); double getradius(); double area(); double price();protected: double radius;}; Circle::Circle(int c,double r):Shape(c){ radius=r;}double Circle::getradius(){ return radius;} double Circle::area(){ return PI*radius*radius;}double Circle::price(){
return PI*radius*radius*color;}class RsubC:public Rectangle,public Circle{public: RsubC(int c,double w,double h,double r,bool s):Rectangle(c,w,h),Circle(c,r),sign(s){} float area();private: bool sign;};float RsubC::area(){ if(sign==1) return Rectangle::area()-Circle::area();
if(sign==1) return Rectangle::area()+Circle::area();}int main(){ RsubC rc=RsubC(1,2,3,1,1);cout<<"RsubC area:"<<rc.area()<<endl;return 0; }