20-类和对象-封装-点和圆的关系

#include<iostream>
using namespace std;
//点和圆关系案例
//点类
class Point
{
public:
  //设置X坐标
  void setX(int x)
  {
    m_X = x;
  }
  //获取X坐标
  int getX()
  {
    return m_X;
  }
  //设置Y坐标
  void setY(int y)
  {
    m_Y = y;
  }
  //获取Y坐标
  int getY()
  {
    return m_Y;
  }
private:
  int m_X;
  int m_Y;
};
//圆类
class Circle
{
public:
  //设置半径
  void setR(int r)
  {
    m_R = r;
  }
  //获取半径
  int getR()
  {
    return m_R;
  }
  //设置圆心
  void set_Center(Point center)
  {
    m_Center = center;
  }
  //获取圆心
  Point getCenter()
  {
    return m_Center;
  }
private:
  int m_R; //半径
  Point m_Center;//圆心
};
//判断点和圆的关系
void isInCircle(Circle& c, Point& p)
{
  //计算两点之间距离
  int distance =
    (c.getCenter().getX() - p.getX()) * (c.getCenter().getX() - p.getX()) +
    (c.getCenter().getY() - p.getY()) * (c.getCenter().getY() - p.getY());
  //计算半径的平方
  int rDistance = c.getR() * c.getR();
  //判断关系
  if (distance == rDistance)
  {
    cout << "点在圆上" << endl;
  }
  else if (distance > rDistance)
  {
    cout << "点在圆外" << endl;
  }
  else
  {
    cout << "点在圆内" << endl;
  }
}
int main()
{
  //创建圆
  Circle c;
  c.setR(10);
  Point center;
  center.setX(10);
  center.setY(10);
  c.set_Center(center);
  //创建点
  Point p;
  p.setX(10);
  p.setY(12);
  //判断关系
  isInCircle(c, p);
  system("pause");
  return 0;
}