c++入門

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#include<iostream>
using namespace std;
class point{
public :
int x,y;
    point();
    point(int x,int y);
    ~point();
};
void main()
{
    point p1;
    point p2(800,600);
    cout<<"p1: "<<p1.x<<" "<<p1.y<<endl;
    cout<<"p2: "<<p2.x<<" "<<p2.y<<endl;
}
point:: point()
{
    cout<<"調用了預設建構函式"<<endl;
    x=0;
    y=0;
}
point::point(int x,int y)
{
     cout<<"調用了非預設建構函式"<<endl;
this->x=x;
this->y=y;
}
point::~point()
{
    cout<<"調用了解構函式"<<endl;
}