4-3-2

 1 #include <iostream>
 2 using namespace  std;
 3 class Point
 4 {
 5 public:
 6     Point(int xx=0,int yy=0)
 7     {
 8         x=xx;
 9         y=yy;
10         cout<<"Constructor is called"<<endl;
11     }
12     Point(Point &p);
13     int getX()
14     {
15         return x;
16     }
17     int getY()
18     {
19         return y;
20     }
21 private://number(编号)、sex(性别)、birthday(出生日期)、id（身份证号）
22     int x,y;
23 };
24 Point::Point(Point &p)
25 {
26     x=p.x;
27     y=p.y;
28     cout<<"Calling the copy constructor"<<endl;
29 }
30 
31 void f(Point p)
32 {
33     cout<<p.getX()<<endl;
34 }
35 
36 Point g()
37 {
38     Point a(1,2);
39     return a;
40 }
41 int main()
42 {
43   cout<<"Point a(1,2);"<<endl;
44   Point a(1,2);
45   cout<<"Point b(a);"<<endl;
46   Point b(a);
47   cout<<"Point c=a;"<<endl;
48   Point c=a;
49   cout<<"f(a);"<<endl;
50   f(a);
51   cout<<"c=g();"<<endl;
52   c=g();
53   return 0;
54 }