#include <iostream>
#include <cmath>
#include <time.h>


#define LINE 128

using namespace std;

typedef struct point // структура кординаты
{
    int x;
    int y;
    int z;
};


double Volume(point l1, point l2, point l3)
{
    return ((l1.x*l2.y*l3.z) + (l1.y * l2.z * l3.x) + (l1.z * l2.x * l3.y) - (l1.z * l2.y * l3.x) - (l1.x * l2.z * l3.y) - (l1.y * l2.x * l3.z)) / 6.0;
}

int main()
{
    srand(time(0));
    point listofpoints[4]; // МАССИВ точек

    for (size_t i = 0; i < 4; i++)
    {
        /*--------------Генерация--------------*/
        point temp;
        temp.x = -LINE + (rand() % (2*LINE)); temp.y = -LINE + (rand() % (2*LINE)); temp.z = -LINE + (rand() % (2*LINE));
        cout << i+1 << ". " << temp.x << " " << temp.y << " " << temp.z << endl; // Вывод в терминал кординат
        listofpoints[i] = temp;
        /*--------------Генерация--------------*/
    }

    point l1,l2,l3;

    l1.x = listofpoints[1].x - listofpoints[0].x; l1.y = listofpoints[1].y - listofpoints[0].y; l1.z = listofpoints[1].z - listofpoints[0].z;
    l2.x = listofpoints[2].x - listofpoints[0].x; l2.y = listofpoints[2].y - listofpoints[0].y; l2.z = listofpoints[2].z - listofpoints[0].z;
    l3.x = listofpoints[3].x - listofpoints[0].x; l3.y = listofpoints[3].y - listofpoints[0].y; l3.z = listofpoints[3].z - listofpoints[0].z;


    cout << abs(Volume(l1,l2,l3)) << endl; // вывод объема

    cin >> l1.x;


    return 0;
}