struct 2

#include <iostream>
#include <ctime>
#include <cstdlib>
#include <string>
#include <cmath>
#include <locale.h>

using namespace std;

struct point
{
    float x;
    float y;
};

class square
{
    float P;
    float S;
    float ab, bc, cd, da;
    point* mass;
    string type;

    void swap_point(point& a1, point& a2)
    {
        point a3;

        a3 = a1;
        a1 = a2;
        a2 = a3;
    }

    float dlina(point a1, point a2)
    {
        return sqrt((a1.x - a2.x) * (a1.x - a2.x) + (a1.y - a2.y) * (a1.y - a2.y));
    }

    float Acos(point a, point b, point c, point d)
    {
        float x1 = a.x - b.x, x2 = c.x - d.x;
        float y1 = a.y - b.y, y2 = c.y - d.y;
        float d1 = sqrt(x1 * x1 + y1 * y1);
        float d2 = sqrt(x2 * x2 + y2 * y2);
        return cos((x1 * x2 + y1 * y2) / (d1 * d2));
    }

    int fun1()
    {
        P = -1;
        S = -1;
        for (int i = 0; i < 3; i++)
            for (int j = i + 1; j < 4; j++)
                if (mass[i].x == mass[j].x && mass[i].y == mass[j].y)
                {
                    type = "Что-то";
                    return 0;
                }


        for (int i = 0; i < 4; i++)
            for (int j = i + 1; j < 4; j++)
                for (int k = j + 1; k < 4; k++)
                    if (mass[i].x == mass[j].x && mass[j].x == mass[k].x || mass[i].y == mass[j].y && mass[j].y == mass[k].y)
                    {
                        type = "Что-то";
                        return 0;
                    }

        for (int i = 0; i < 4; i++)
            for (int j = 0; j < 4; j++)
                if (mass[i].x < mass[j].x && i != j)
                    swap_point(mass[i], mass[j]);




        if (mass[0].y > mass[1].y)
            swap_point(mass[0], mass[1]);

        if (mass[3].y > mass[2].y)
            swap_point(mass[3], mass[2]);






        float a = dlina(mass[0], mass[1]);
        float b = dlina(mass[1], mass[2]);
        float c = dlina(mass[2], mass[3]);
        float d = dlina(mass[3], mass[0]);

        float d1 = dlina(mass[0], mass[2]);
        float d2 = dlina(mass[1], mass[3]);

        P = (a + b + c + d);
        S = sqrt((P / 2 - a) * (P / 2 - b) * (P / 2 - c) * (P / 2 - d));

        if ((Acos(mass[0], mass[1], mass[3], mass[2]) >= 0.540301 && Acos(mass[0], mass[1], mass[3], mass[2]) <= 0.540303) || (Acos(mass[0], mass[3], mass[1], mass[2]) >= 0.540301 && Acos(mass[0], mass[3], mass[1], mass[2]) <= 0.540303))
            if ((Acos(mass[0], mass[1], mass[3], mass[2]) >= 0.540301 && Acos(mass[0], mass[1], mass[3], mass[2]) <= 0.540303) && (Acos(mass[0], mass[3], mass[1], mass[2]) >= 0.540301 && Acos(mass[0], mass[3], mass[1], mass[2]) <= 0.540303))
            {
                type = "Параллелограмм";
                if (a == b && b == c && c == d)
                    if (d1 == d2)
                        type = "Квадрат";
                    else
                        type = "Ромб";
            }
            else
                type = "Трапеция";

        else
            type = "Четырехугольник";

        return 1;
    }

public:


    void print_all_inf()
    {
        cout << "P: " << P << endl << "S: " << S << endl << "Type: " << type << endl;

        for (int i = 0; i < 4; i++)
            cout << "(" << mass[i].x << ";" << mass[i].y << ")  ";
        cout << endl << endl;
    }


    square(int choice)
    {
        mass = new point[4];

        if (choice != 1 && choice != 2)
        {
            cout << "1) Rand\n2) Input\n\n";
            do
            {
                cin >> choice;
            } while (choice != 1 && choice != 2);
        }

        if (choice == 1)
        {
            for (int i = 0; i < 4; i++)
            {
                mass[i].x = (float)(rand() % 100);
                mass[i].y = (float)(rand() % 100);
            }

        }

        if (choice == 2)
        {
            for (int i = 0; i < 4; i++)
            {
                cout << "Enter x " << i + 1 << " point: ";
                cin >> mass[i].x;
                cout << "Enter y " << i + 1 << " point: ";
                cin >> mass[i].y;
            }
        }

        fun1();
    }


};


int main()
{
    setlocale(LC_ALL, "rus");
    srand(time(NULL));

    square b(1);

    b.print_all_inf();

    square c(2);
    c.print_all_inf();

    system("pause");
    return 0;
}