这个不知道哪里的问题

#include
#define PI 3.1415936;
using namespace std;
class circle
{private: double radious;
public: circle(double r=0){radious=r;}
double round(double radious){return 2PIradious;}
double area(double radious){return PIradiousradious;}
};

#define PI 3.1415936; 后面的分号删掉，不能加的