OJ Shape 组合问题

问题：

Problem L: Shape系列-5

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 222  Solved: 181
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Description

JC和Kitty听说小亮和小华有了Rectangle和Circle并用RsubC类比较了大小，于是想借小亮和小华的Rectangle和Circle来仿制自己的形状，于是JC和Kitty完成了自己的rectangle类和circle类，他们两个也要比较一下形状大小。 但是JC和Kitty没有为RsubC1类（其中的布尔类型 sign等于0时，新面积等于Rectangle+Circle，sign等于1时，新面积等于Rectangle-Circle）写构造函数与area面积函数，请帮助 JC和Kitty完成RsubC1类。

//小强写的文件头和各种类

#include
using namespace std;
#define pi 3.14
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 1000;
}
class Rectangle:public Shape
{
public:
 Rectangle();
 Rectangle(int c, double w,double h);
 double getwidth();
 double getheight();
 double area();
 double price();
protected:
 double width,height;
};
Rectangle::Rectangle()
{
 width=10;height=5;
}
Rectangle::Rectangle(int c, double w,double h):Shape(c)
{
 width=w;
 height=h;
}
double Rectangle::getwidth()
{
 return width;
}

double Rectangle::area()
{
 return width*height;
}
double Rectangle::getheight()
{
 return height;
}

double Rectangle::price()
{
 return color*width*height;
}
class Circle:public Shape
{
public:
 Circle();
 Circle(int c,double r);
 double getradius()
 {
  return radius;
 }
 double area();
protected:
 double radius;
};
Circle::Circle()
{
 radius=10;
}
Circle::Circle(int c,double r):Shape(c)
{
 radius=r;
}
double Circle::area()
{
 return radius*radius*pi;
}

// RsubC1类

class RsubC1:public Shape
{
public:
 RsubC1(int c,double w,double h,double r,bool s);
 double area();
private:
 Rectangle rectangle;
 Circle circle;
 bool sign;
};

//JC和Katy的测试函数：

int main()
{
 RsubC1 rc1=RsubC1(3,2,3,1,1);
 
 RsubC1 rc2=RsubC1(1,2,1,2,0);

 cout<<"rc1 area="<  
 cout<<"rc2 area="<

 return 0;
}

提示：不用提交全部程序，只提交补充部分。

Input

无

Output

输出JC和Katy测试的RsubC类的面积。

Sample Output

rc1 area=2.86rc2 area=14.56

 

代码：

#include
using namespace std;
#define pi 3.14
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 1000;
}
class Rectangle:public Shape
{
public:
    Rectangle();
    Rectangle(int c, double w,double h);
    double getwidth();
    double getheight();
    double area();
    double price();
protected:
    double width,height;
};
Rectangle::Rectangle()
{
    width=10;
    height=5;
}
Rectangle::Rectangle(int c, double w,double h):Shape(c)
{
    width=w;
    height=h;
}
double Rectangle::getwidth()
{
    return width;
}
double Rectangle::area()
{
    return width*height;
}
double Rectangle::getheight()
{
    return height;
}

double Rectangle::price()
{
    return color*width*height;
}
class Circle:public Shape
{
public:
    Circle();
    Circle(int c,double r);
    double getradius()
    {
        return radius;
    }
    double area();
protected:
    double radius;
};
Circle::Circle()
{
    radius=10;
}
Circle::Circle(int c,double r):Shape(c)
{
    radius=r;
}
double Circle::area()
{
    return radius*radius*pi;
}

// RsubC1类

class RsubC1:public Shape
{
public:
    RsubC1(int c,double w,double h,double r,bool s);
    double area();
private:
    Rectangle rectangle;
    Circle circle;
    bool sign;
};
RsubC1::RsubC1(int c,double w,double h,double r,bool s):Shape(c),rectangle(c,w,h),circle(c,r),sign(s) {}
double RsubC1::area()
{
    if(sign)
        return rectangle.area()-circle.area();
    else
        return rectangle.area()+circle.area();
}
int main()
{
    RsubC1 rc1=RsubC1(3,2,3,1,1);

    RsubC1 rc2=RsubC1(1,2,1,2,0);

    cout<<"rc1 area="<
 
  
学习心得：遇见组合问题还不敏感，这次深有体会，下次遇着一定要会。