#include<iostream.h>
#include<math.h>
template <class T>
class Point
{
public:
	T x,y;
	Point(T a,T b)
	{
		x=a;
		y=b;
	}
	print()
	{
		cout<<"你輸入的橫坐標："<<endl;
		cout<<x<<endl;
		cout<<"你輸入的縱坐標："<<endl;
		cout<<y<<endl;
	}
};
template <class T>
class Line
{
public:
	T d;
	Point<T> a;
	Point<T> b;
	Line(T i,T j ,T k, T l):a(i,j),b(k,l)
	{
		
		d=sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
		cout<<"直線長度"<<d<<endl;
	}
};

void main()
{
	double a,b,c,d;
	cout<<"輸入第一個點的坐標"<<endl;
	cin>>a>>b;
	cout<<"輸入第二個點的坐標"<<endl;
	cin>>c>>d;
	Point <double> m(a,b);
	cout<<"第一個點"<<endl;
	m.print();
	Point <double> n(c,d);
	cout<<"第二個點"<<endl;
	n.print();
	Line <double>p(a,b,c,d);
	return ;
}