YTU 2918: Shape系列-4

2918: Shape系列-4

时间限制: 1 Sec  内存限制: 128 MB
提交: 276  解决: 232

题目描述

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 3.14
using 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。

输入

无

输出

输出小聪测试的RsubC的面积。

样例输出

RsubC area:2.86

im0qianqian_站在回忆的河边看着摇晃的渡船终年无声地摆渡,它们就这样安静地画下黄昏画下清晨......

#include<iostream>
#define PI 3.14
using 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 Shape
{
public:
    RsubC(int c,double w,double h,double r,bool s);
    double area();
private:
    Rectangle rectangle;
    Circle circle;
    bool sign;
};
RsubC::RsubC(int c,double w,double h,double r,bool s):Shape(c),rectangle(c,w,h),circle(c,r),sign(s) {}
double RsubC::area()
{
    if(sign==0)
        return rectangle.area()+circle.area();
    else
        return rectangle.area()-circle.area();
}
int main()
{
    RsubC rc=RsubC(1,2,3,1,1);
    cout<<"RsubC area:"<<rc.area()<<endl;
    return 0;
}