设计一个圆类（Circle），属性包括char *Name,double R。其中Name为圆的名称指针变量，R为圆的半径。
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发布时间：2022-05-10 21:23
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时间：2023-11-02 02:14
const double PI=3.1415926;
class Shapes
{
protected:
double x,y;
public:
Get_value(double xx=0,double yy=0)
{x=xx;y=yy;}
virtual void area()=0;
virtual void perim()=0;
};
class Rectangle:public Shapes
{
public:
void area()
{cout<<"The area of Rectangle is:"<<x*y<<endl;}
void perim()
{cout<<"The perim of Rectangle is:"<<2*(x+y)<<endl;}
};
class Circle:public Shapes
{
public:
void area()
{cout<<"The area of Circle is:"<<PI*x*x<<endl;}
void perim()
{cout<<"The perim of Circle is:"<<2*PI*x<<endl;}
};
void main()
{
double a,b,r;
Shapes *ptr[2];
Rectangle rect;
Circle cir;
ptr[0]=▭
cout<<"Please input the len and wid of Rectangle: "<<endl;
cin>>a>>b;
ptr[0]->Get_value(a,b);
ptr[0]->area();
ptr[0]->perim();
cout<<endl;
ptr[1]=○
cout<<"Please input the value of Circle:"<<endl;
cin>>r;
ptr[1]->Get_value(3);
ptr[1]->area();
ptr[1]->perim();
cout<<endl;
}
