#include<iostream.h>
#include<math.h>
#define Pi 3.1415926
class point
{
public:
    double x;
    double y;
    double x0;
    double y0;
    point()
    {   
        cout<<"请输入一个横坐标:";cin>>x0;
        cout<<"请输入一个纵坐标:";cin>>y0;
    }

    void disp()
    {  
        cout<<"\t坐标:("<<x0<<","<<y0<<")";
    }
};

class circle
{
public:
    double x1;
    double y1;
    double r;
    int sum;
    int count;
    double s;
    circle()
    {   
      
        cout<<"请输入园的横坐标:";cin>>x1;
        cout<<"请输入园的纵坐标:";cin>>y1;
        cout<<"请输入半径:";cin>>r;
    }

    void disp()
    {
        sum=0;count=0;
      
      
        cout<<"\t园坐标:("<<x1<<","<<y1<<")";
        cout<<"\t面积:"<<Pi*r*r;
        if(r>s)
        {
            cout<<"\t距离是"<<sqrt((point.x0-x1)*(point.y0-y1)+(point.x0-x1)*(point.y0-y1));cout<<endl;
            cout<<"\t点在圆心内"<<endl;
            sum++;   
        }
        else
        {
            cout<<"\t距离是0";cout<<endl;
            cout<<"\t点不在圆心内"<<endl;
        }
    }

    friend bool puanduan(circle r,circle s)
    {
    }
};

void main()
{

    char flag;
    int count=0;
    int sum=0;
   
    do
    {
        point p;
        circle c;   

        p.disp();
        c.disp();
        if(c.r>c.s)
        {
            sum++;
        }
        count++;
        cout<<"继续判断?";cin>>flag;   
    }while(flag!='n');
    cout<<"判断了"<<count<<"次"<<"包含"<<sum<<"次."<<endl;
}

红色地方出错了  怎么会的?

[[it] 本帖最后由 happycplusplus 于 2008-10-14 20:46 编辑 [/it]]

point.x0就是上面point类定义个double x0

因为用的是构造函数 所以不知道怎么解决自动调用2次point