yuan.h

这个程序是我花了好长时间才做出来的。希望能给大家帮助！！

class point
{
public:
int x,y;
void input1(){cout<<"请输入横坐标:";cin>>x;
              cout<<"请输入纵坐标:";cin>>y;}
void show(){cout<<"圆心为"<<x<<","<<y<<endl;}
};
class circle:public point
{
public:
int r;
double s,c;
void input(){cout<<"请输入半径:";cin>>r;}
void showarea(){s=3.14*r*r;cout<<"圆面积="<<s<<endl;}
void showc(){c=2*3.14*r;cout<<"圆周长="<<c<<endl;}
};