c++小问题

[Ditto47]

1．试指出以下程序的错误，并改正之。
#include <iostream.h>
class CPoint
{
public:
unsigned x,
unsigned y;
bool IsInCircle(CCircle *Circle)
{
return (((x-Circle->Center.x)*(x-Circle->Center.x)
+(y-Circle->Center.y)*(y-Circle->Center.y))<=Circle->Radius*Circle->Radius);
}
};
class CCircle
{
public:
unsigned Radius;
CPoint Center;
}

[蓝白云]

估计这是一道面试题。可以看出，出题之人经验丰富，由浅入深，从整体到局部，行行包含了许多问题。实在是高