#include<iostream>
#include<math.h>
using namespace std;
class Point
{
private:
 int x[10];//横坐标
 int y[10];//纵坐标
public:
 void  display();
 void  set();
 float lenth();//求得两点之间的距离
 Point();
 ~Point();
};
void Point::display()
{
 int i=0;
 for(i=0;i<10;i++)
  cout << x[i] <<","<<y[i]<< endl;
}
/*void Point::set()
{
   Point();
}*/
float Point::lenth()//
{

 float sum=0;
 int i;
 for(i=0;i<9;i++)
  sum=(float)sqrt((x[i]-x[i+1])*(x[i]-x[i+1])+(y[i]-y[i+1])*(y[i]-y[i+1]));
    cout<<sum<<endl;
 return 0.0;
}
Point::Point()
{
 int i,m,n;
 cout<<"input accont"<<endl;
 for(i=0;i<10;i++)
 {
 cin>>m>>n;
 x[i]=m;
 y[i]=n;
 }
}
Point::~Point()
{
 cout<<"disconstractor"<<endl;
}
int main()
{
    Point *a=new Point;
// (*a).set();
 (*a).display();
 (*a).lenth();
 return 0;
}