#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>

int main(void) {
/*

    int n = 4;

    for (int i = 0; i < 10   ; i++) {
        pid_t pid1 =  fork();
        printf("PID:%d n:%d &n:%d\n", pid1, n, &n);
    }
*/
    pid_t pid = fork();

    if (pid == 0) {
        printf("PID1: %d\n", getpid());
    }

    else {
        sleep(3);
        printf("PPID: %d\n", getpid());
    }

    if (pid != 0) {
        sleep(3);
        kill(pid, SIGKILL);
        wait(NULL);
    }

    pid_t pid_2 = fork();

    if (pid_2 == 0) {
        printf("PID2: %d\n", getpid());
    }

    else {
        printf("PPID: %d\n", getpid());
    }

    if (pid == 0) {
        sleep(3);
        kill(getppid(), SIGKILL);
    }

    return 0;

}