#include <graphics.h>
#include <iostream>
using namespace std;
class Polygon
{
    int po[1][10], edges;

public:
    Polygon()
    {
        edges = 0;
        po[1][10] = 0;
    }
    void setedge();
    void setpo(int);
    int getedata();
    int getx(int);
    int gety(int);
};

class DrawPolygon : public Polygon
{
public:
    void lines(int, int, int, int);
} p;

void DrawPolygon::lines(int x0, int y0, int xEnd, int yEnd)
{
    line(x0, y0, xEnd, yEnd);
}

void Polygon::setedge()
{
    cout << "\nEnter the number of edges of polygon ";
    cin >> edges;
}

void Polygon::setpo(int index)
{
    cout << "Enter the coordinate x" << index + 1 << " ";
    cin >> po[0][index];
    cout << "Enter the coordinate y" << index + 1 << " ";
    cin >> po[1][index];
}

int Polygon::getedata()
{
    return edges;
}

int Polygon::getx(int index)
{
    return po[0][index];
}

int Polygon::gety(int index)
{
    return po[1][index];
}

int main()
{
    p.setedge();
    Polygon();
    int ch, ch1, ch2;
    int x0, y0, xEnd, yEnd;
    int gd, gm;
    gd = DETECT;
    ch = p.getedata() - 1;
    for (int i = 0; i <= ch; i++)
    {
        p.setpo(i);
    }
    initgraph(&gd, &gm, NULL);
    for (int i = 0; i < ch; i++)
    {
        x0 = p.getx(i);
        y0 = p.gety(i);
        xEnd = p.getx(i + 1);
        yEnd = p.gety(i + 1);
        p.lines(x0, y0, xEnd, yEnd);
    }
    x0 = xEnd;
    y0 = yEnd;
    xEnd = p.getx(0);
    yEnd = p.gety(0);
    p.lines(x0, y0, xEnd, yEnd);
    delay(7000);
    return 0;
}

kodingwindow@kw:~$ g++ kw.cpp -lgraph
kodingwindow@kw:~$ ./a.out
Enter the number of edges of polygon 5
Enter the coordinate x1 100
Enter the coordinate y1 100
Enter the coordinate x2 200
Enter the coordinate y2 100
Enter the coordinate x3 200
Enter the coordinate y3 200
Enter the coordinate x4 100
Enter the coordinate y4 200
Enter the coordinate x5 150
Enter the coordinate y5 150