c++实例点和圆的关系

点和圆的关系
点类
class Point
{
public:
	void setX(int x)
	{
		m_X = x;
	}
	int getX()
	{
		return m_X;
	}
	void setY(int y)
	{
		m_Y = y;
	}
	int getY()
	{
		return m_Y;
	}
private:
	int m_X;
	int m_Y;
};
//圆类
class Circle
{
public:
	void setR(int r)
	{
		m_R = r;
	}
	int getR()
	{
		return m_R;
	}
	void setCenter(Point center)
	{
		m_Center = center;
	}
	Point getCenter()
	{
		return m_Center; 
	}
private:
	int m_R;
	Point m_Center;
};
//判断点和圆的关系
void isincircle(Circle c, Point p)
{
	//点到圆心距离的平方
	int d =
		(c.getCenter().getX() - p.getX()) *
		(c.getCenter().getX() - p.getX()) +
		(c.getCenter().getY() - p.getY()) *
		(c.getCenter().getY() - p.getY());
	//半径的平方
	int rd = c.getR() * c.getR();
	//判断关系
	if (d == rd)
		cout << "点在圆上" << endl;
	else if (d > rd)
		cout << "点在圆外" << endl;
	else if (d < rd)
		cout << "点在圆内" << endl;
}
int main()
{
	Circle c;
	c.setR(10);
	Point center;
	center.setX(0);
	center.setY(0);
	c.getCenter(center);
	Point p;
	p.setX(10);
	p.setY(10);
	isincircle(c, p);
	system("pause");
}