missing storage-class or type specifiers问题，大佬请进

#include
using namespace std;
class Point
{public:
Point(double a=0,double b=0) { x=a;y=b;}
virtual double Area()
{ cout<<"Call Point's Area function."<<endl;
return 0.0;
}
protected:
double x,y;
};

class RightTriangle:public Point
{public:
RightTriangle(double a=0,double b=0,double c=0,double d=0):Point(a,b)
{x1=c;y1=d;}
double Area()
{cout<<"Call RightTriangle's Area function."<<endl;
return ((x1-x)*(y1-y))/2;
}
protected:
double x1,y1;
};

class Circle:public Point
{public:
Circle(double a=0,double b=0,double u=0,double i=0,double r=0):Point(a,b)
{x2=u,y2=i;r=sqrt(pow((x2-x),2)+pow((y2-y),2));}
double Area()
{cout<<"Call Circle's Area function."<<endl;
return 3.14*r*r;
}
protected:
double x2,y2;r;
};

double CalcArea(Point &men) { return (men.Area());}
int main()
{
Point p(0,0);
RightTriangle r(0,0,2,2);
Circle c(0,0,1,2);
cout<<CalcArea(p)<<endl;
cout<<CalcArea(r)<<endl;
cout<<CalcArea(c)<<endl;
return 0;
}

最终有一个这个问题error C2501: 'r' : missing storage-class or type specifiers，搜得满身大汗都没搞懂到底怎么修改这个错误还请大佬解答萌新跪谢~~

分号改成逗号
protected:
double x2,y2,r;