#include<iostream.h>
class point
{
private:
 int x,y;
public:
 point(int a=0,int b=0)
 {
 x=a;
 y=b;
 }
 point (point &p);
 int getx()
 {
 return x;
 }
 int gety()
 {
 return y;
 }
};
point ::point(point &p)

 {
 x=p.x+10;
 y=p.y+20;
 cout<<"调用拷贝构造函数"<<endl;
 }
void f(point p)
{
cout<<p.getx()<<"   "<<p.gety()<<endl;
}
point g()
{
point q(3,5);
return q;


}
void main()
{
point p1(2,4);
point p2(p1);
cout<<p2.getx()<<"  "<<p2.gety()<<endl;
f(p2);                                     //这里不太懂   
cout<<p2.getx()<<"  "<<p2.gety()<<endl;    //调用完之后X Y为何没变      参数为对象 自动调用拷贝构造函数的。。
p2=g();
cout<<p2.getx()<<"  "<<p2.gety()<<endl;


}