/* Viet chuong trinh gom

+Lop Diem

-thuoc tinh x,y thuc

+phuong thuc: nhap ,xuat ,tinh khoang cach 2 diem

+ham main

-nhap 1 day n diem

-tinh do dai duong gap khuc noi cac diem vua nhap theo thu tu

1->2

2->3

...

(n-1)->n

thay phuong thuc bang ham ban */

#include<stdio.h>

#include<conio.h>

#include<iostream.h>

#include<math.h>

class Diem

{ private:

float x,y;

public:

friend void nhap(Diem u);

friend void xuat(Diem u);

friend float kc(Diem u,Diem v);

};

void nhap(Diem u)

{ cout<<"

Nhap x:";

cin>>u.x;

cout<<"

Nhap y:";

cin>>u.y;

}

void xuat(Diem u)

{ cout<<"

x="<<u.x<<"y="<<u.y;

}

float kc(Diem u,Diem v)

{ float s;

s=sqrt(pow(u.x-v.x,2)+pow(u.y-v.y,2));

return s;

}

void main()

{ clrscr();

Diem d[50];

int n,i;

float s;

cout<<"

So diem N=";

cin>>n;

for(i=1;i<=n;i++)

{ cout<<"

Toa do diem"<<i<<":";

nhap(d[i]);

}

// s=0;

for(i=1;i<=n-1;i++)

{ s=kc(d[i],d[i+1]);

}

cout<<"

Do dai duong gap khuc ="<<s;

getch();

}