#include<iostream.h>
#include<math.h>
class CCircle
{public:
    //CCircle(double r){}
    virtual void Area();
    virtual void Volume();
 protected:
    double radius;
};
class CSphere:public CCircle
{public:
    CSphere(double r){radius=r;}
    void Area()
    {
     area=4*3.14*pow(radius,2);
     cout<<"Area="<<area<<endl;
    }
    void Volume()
    {
     volume=4/3*3.14*pow(radius,3);
     cout<<"Volume="<<volume<<endl;
    }
 protected:
    double area,volume;

};
class CColumn:public CCircle
{public:
    CColumn(double h,double r){radius=r;height=r;}
    void Area()
    {
     area=2*3.14*(radius*height+pow(radius,2));
     cout<<"ColumnArea="<<area<<endl;
    }
    void Volume()
    {
     volume=3.14*pow(radius,2)*height;
     cout<<"CloumnVolume="<<volume<<endl;
    }
 private:
    double area,volume,height;
};
void main()
{CSphere a(2);
 CColumn b(2,5);
 CCircle *p=&a;
 p->Area();
 p->Volume();
 p=&b;
 (*p).Area();
 (*p).Volume();
}
..这个程序在compile的时候没有错误，却在build的时候出现错误了，麻烦高手帮帮忙。