C++错误代码

C++错误代码2296是怎么回事
#include "iostream.h"
const double pi=3.14159;
const int jg1=20;
const int jg2=35;
class circle
{
private :
float radius;
public:
circle(float r);
double zc()const;
double area()const;
};
circle ::circle(float r)
{
radius=r;
}
double circle::zc()const
{
return 2*pi*radius;
}
double circle::area()const
{
return pi*radius*radius;
}
void main()
{
float radius;
double concreteCost, fenceCost;
cout<<"输入数:"<<endl;
cin>>radius;
circle pool(radius);
circle poolRim(radius +3);
fenceCost=(poolRim.zc)*jg2;(((((((((这行错了))))))))错在哪怎么写
cout<<fenceCost<<endl;
concreteCost=(poolRim.area()-pool.area())*jg1;
cout<<concreteCost<<endl;
}

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