czas

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <sys/wait.h>
#include <sys/stat.h>

double silnia(double);


int main() {
    int ch1, status1;
    int ch2, status2;
    int ch3, status3;
    int n;
    float eps;
    int fd[2];
    int fdd[2];

    pipe(fd);
    pipe(fdd);


    if (ch1 = fork() == 0) {
        char str[50], wynik[50];
        double X;
        double Eps;


        printf("Podaj wartosci X \r\n");
        scanf("%lf", &X);
        printf("Podaj wartosci Eps \r\n");
        scanf("%lf", &Eps);


        sprintf(wynik, "%lf", Eps);
        sprintf(str, "%lf", X);
        close(fd[0]);
        write(fd[1], str, sizeof(str));
        write(fd[1], wynik, sizeof(wynik));
        exit(0);
    }
    wait(NULL);
    if (ch2 = fork() == 0) {
        waitpid(ch1, &status1, WCONTINUED);
        double X, Eps;
        char str[50], wynik[50];
        close(fd[1]);
        read(fd[0], str, sizeof(str));
        X = atof(str);
        read(fd[0], str, sizeof(str));
        Eps = atof(str);

        printf("X = %f\n", X);
        printf("Eps = %f\n", Eps);

        exit(0);
    }
    wait(NULL);
    if ((ch3 = fork()) == 0) {

        return 0;
    }

    waitpid(ch3, &status3, WCONTINUED);


    return 0;

}

double silnia(double param) {
    double wynik = 1, i = 1;
    while (i <= param) {
        wynik *= i;
        i++;
    }
    return wynik;
}