2023.4.16

 1 #include <iostream>
 2 using namespace std;
 3 //设计圆类和点类，判断点和圆的关系
 4 class Point
 5 {
 6 public:
 7     void setX(int x)
 8     {
 9         m_X = x;
10     }
11     int getX()
12     {
13         return m_X;
14     }
15     void setY(int y)
16     {
17         m_Y = y;
18     }
19     int getY()
20     {
21         return m_Y;
22     }
23 private:
24     int m_X;
25     int m_Y;
26 };
27 class Circle
28 {
29 public:
30     void setR(int r)
31     {
32         m_R = r;
33     }
34     int getR()
35     {
36         return m_R;
37     }
38     void setCenter(Point center)
39     {
40         m_Center = center;
41     }
42     Point getCenter()
43     {
44         return m_Center;
45     }
46 private:
47     int m_R;
48     Point m_Center;
49 };
50 void isInCircle(Circle &c,Point &p)
51 {
52     int a = c.getR()*c.getR();
53     int b = (p.getX()-c.getCenter().getX())*(p.getX()-c.getCenter().getX())+(p.getY()-c.getCenter().getY())*(p.getY()-c.getCenter().getY());
54     if(a == b)
55     {
56         cout<<"点在圆上"<<endl;
57     }
58     else if(a > b)
59     {
60         cout<<"点在圆内"<<endl;
61     }
62     else if(a < b)
63     {
64         cout<<"点在圆外"<<endl;
65     }
66 }
67 int main()
68 {
69     Point p;
70     p.setX(1);
71     p.setY(1);
72     Point pr;
73     pr.setX(1);
74     pr.setY(1);
75     Circle c;
76     c.setCenter(pr);
77     c.setR(1);
78     isInCircle(c,p);
79     return 0;
80 }