#include <iostream>
using namespace std;
class point 
{
private:
	double fx,fy;
public:
	point();//不带参
	point(double fx,double fy);//带参
	void showpoint();
};
point::point()
{
	fx=0.0;
	fy=0.0;
}
point::point(double x,double y=5.0)
{
	fx=x;
	fy=y;
}
void point::showpoint()
{
	cout<<fx<<" "<<fy<<endl;
}
void main()
{
	point f1;
	cout<<"the fx and fy of f1: ";
	f1.showpoint();
	point f2(10);
	cout<<"the fx and fy of f2: ";
	f2.showpoint();
	point f3(1.1,2.0);
	cout<<"the fx and fy of f3: ";
	f3.showpoint();
}