题解 | 点和圆的关系

#include <iostream>
#include <cmath>
#include <string>
using namespace std;

class Pointer
{
public:
	int x;
	int y;
	Pointer(int x, int y)
	{
		this->x = x;
		this->y = y;
	}
	Pointer()
	{

	}
};

class Circle
{
public:
	Pointer center;
	int radius;
	Circle(Pointer center, int radius)
	{
		this->center = center;
		this->radius = radius;
	}
	string isPointerInCircle(Pointer p)
	{
		int p_x = p.x;
		int p_y = p.y;
		int c_x = center.x;
		int c_y = center.y;
		double distance = sqrt(pow(p_x - c_x, 2) + pow(p_y - c_y, 2));
		if (distance > radius)
		{
			return "out";
		}
		else if (distance == radius)
		{
			return "on";
		}
		else
		{
			return "in";
		}

	}
};


int main()
{
	int x, y;
	cin >> x >> y;
	Pointer p1(x, y);
	int c_x = 5;
	int c_y = 0;
	int r = 5;
	Pointer p2(c_x, c_y);
	Circle cir(p2,r);
	cout << cir.isPointerInCircle(p1);

	return 0;
}