Test

// 1 proba.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"


class figura
{
    public:

    struct Punkt
    {
        double x,y;
        Punkt():x(0),y(0) {}
        Punkt(double x,double y):x(x),y(y) {}
    };

    vector < Punkt > lista;


    void wyswietl()
    {
        for(int i=0 ; i<lista.size(); i++)
            cout << lista[i].x << lista[i].y;
    }


    void obwod() //dodawanie wszystkich bokow
    {
        int OBW = 0;
        for(int i=0 ; i<lista.size(); i++)
        OBW += sqrt(pow(((lista[i+1].x) - (lista[i].x)),2) + pow((((lista[i+1].y) - (lista[i].y))),2));

        cout << OBW;
    }

};

class trojkat : public figura
{
    public:
    trojkat()
    {
        lista.push_back(Punkt(1,2));
        lista.push_back(Punkt(10,8));
        lista.push_back(Punkt(0,11));
    }

    void pole_trojkata() //ze wzoru
    {
        cout << 0.5 * ((lista[1].x - lista[0].x)*(lista[2].y - lista[0].y) - (lista[1].y - lista[0].y)*(lista[2].x - lista[0].x));
    }
};

class czworokat : public figura
{
    public:
    czworokat()
    {
        lista.push_back(Punkt(1,2));
        lista.push_back(Punkt(1,9));
        lista.push_back(Punkt(5,8));
        lista.push_back(Punkt(0,7));
    }


};

class osmiokat : public figura
{
    public:
    osmiokat()
    {
        lista.push_back(Punkt(1,2));
        lista.push_back(Punkt(3,4));
        lista.push_back(Punkt(5,6));
        lista.push_back(Punkt(7,8));
        lista.push_back(Punkt(9,10));
        lista.push_back(Punkt(11,12));
        lista.push_back(Punkt(13,14));
        lista.push_back(Punkt(15,16));
    }


    void pole_osmiokat() //Shoelace formula
    {
        int B = 0;
        for (int i = 0 ; i < 7 ; i++)
        B += lista[i].x * lista[i+1].y;

        int C = 0;
        for (int i = 0 ; i < 7 ; i++)
        C -= lista[i+1].x * lista[i].y;

        int D = 0;
        D = lista[7].x * lista[0].y;

        int E = 0;
        E = lista[0].x * lista[7].y;

        cout << 0.5 * (B + C + D - E);
    }


};

class kwadrat : public czworokat
{
    public:
    kwadrat()
    {
        lista.push_back(Punkt(1,3));
        lista.push_back(Punkt(3,3));
        lista.push_back(Punkt(3,1));
        lista.push_back(Punkt(1,1));
    }


    void pole_kwadratu() //bok do kwadratu
    {
        cout << pow((sqrt(pow((lista[1].x - lista[0].x),2) + pow((lista[1].y - lista[0].y),2))),2);
    }

};





int _tmain(int argc, _TCHAR* argv[])
{
    //list <trojkat> lista_trojkatow
    //list <trojkat> ::iterator it = lista_trojkatow.begin();





    system("pause");
    return 0;
}