#include <stdio.h>
#include <stdlib.h>
#include <math.h>

double obl_skladowa(int i, int n)
{
    double k = pow(k, 2) - 12;
    double l = pow(p, 3);
    double m = pow(n, 3) * pow(i, 3);
    return l/m;
}

int main(int argc, char* argv[])
{
    int n = atoi(argv[1]);
    int k = atoi(argv[2]);
    int rozm_dane = n / k;
    int i = 1;
    int j = 0;
    double suma, el, el_wynik;
    int pipefd[2];
    pid_t pid;

    if(pipe(pipefd) == -1)
    {
        perror("err pipe\n");
        exit(EXIT_FAILURE);
    }


    for(i = 0; i < k; ++i)
    {
        for (j = 0; j < rozm_dane; ++j)
        {
            pid = fork();

            if(pid == -1)
            {
                perror("err fork\n");
                exit(EXIT_FAILURE);
            }

            if(pid == 0)
            {
                el = obl_skladowa(i, n);
                write(pipefd[1], &el, sizeof(double));
                exit(EXIT_SUCCESS);
            }
        }
    }

    close(pipefd[1]);
    while(read(pipefd[0], &el_wynik, sizeof(double)))
        suma += el_wynik;

    printf("suma: %f\n", suma);
    return EXIT_SUCCESS;
}