C++类和对象深入探索之分文件编写点和圆的关系详解

#pragma once
#include<iostream>
using namespace std;
//创建圆心类
class Point
{
public:
	void setM_x(int x);
	int  getM_x();
	void setM_y(int y);
	int  getM_y();
private:
	int m_x;
	int m_y;
};

#include"point.h"
void Point::setM_x(int x)
{
	m_x = x;
}
int Point::getM_x()
{
	return m_x;
}
void Point::setM_y(int y)
{
	m_y = y;
}
int Point::getM_y()
{
	return m_y;
}

#pragma once
#include<iostream>
#include "point.h"
using namespace std;
//创建 Circle 类
class Circle
{
public:
	void  setM_r(int r);
	int   getM_r();
	void  setCenter(Point &center);
	Point getCenter();
private:
	int m_r;
	Point m_center;
};

#include"Circle.h"
void Circle::setM_r(int r)
{
	m_r = r;
}
int Circle::getM_r()
{
	return m_r;
}
void Circle::setCenter(Point &center)
{
	m_center = center;
}
Point Circle::getCenter()
{
	return m_center;
}

void relative(Circle& c, Point& p)
{
	//圆心到点距离的平方为distance
	int distance =
	(c.getCenter().getM_x() - p.getM_x()) * (c.getCenter().getM_x() - p.getM_x()) +
	(c.getCenter().getM_y() - p.getM_y()) * (c.getCenter().getM_y() - p.getM_y());
	//半径的平方 rDistance
	int rDistance = c.getM_r() * c.getM_r();
	if (distance > rDistance)       cout << "点在圆外" << endl;
	else if (distance == rDistance) cout << "点在圆上" << endl;
	else                            cout << "点在圆内" << endl;
}

#include"Circle.h"
void relative(Circle& c, Point& p)
{
	//圆心到点距离的平方为distance
	int distance =
	(c.getCenter().getM_x() - p.getM_x()) * (c.getCenter().getM_x() - p.getM_x()) +
	(c.getCenter().getM_y() - p.getM_y()) * (c.getCenter().getM_y() - p.getM_y());
	//半径的平方 rDistance
	int rDistance = c.getM_r() * c.getM_r();
	if (distance > rDistance)       cout << "点在圆外" << endl;
	else if (distance == rDistance) cout << "点在圆上" << endl;
	else                            cout << "点在圆内" << endl;
}
int main()
{
	int x = 0, y = 0, a = 0, b = 0, r = 0;
	Circle C;
	Point center, P;
	cout << "圆心横坐标 x 为："; cin >> x; cout << endl;
	cout << "圆心纵坐标 y 为："; cin >> y; cout << endl;
	center.setM_x(x);
	center.setM_y (y);
	C.setCenter(center);
	cout << "此圆 半径  r 为："; cin >> r; cout << endl;
	C.setM_r(r);
	cout << "点横坐标 x 为："; cin >> a; cout << endl;
	cout << "点纵坐标 y 为："; cin >> b; cout << endl;
	P.setM_x(a);
	P.setM_y(b);
	relative(C, P);
}