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

#define CHILDREN 2

int main(void)
{
    pid_t child_pid, wpid;
    int status = 0;
    int i;

    for (i = 0; i < CHILDREN; i++)
    {
        if ((child_pid = fork()) == 0)
        {
            printf("Child (pid = %d)\n", getpid());
            exit(0);
        }
    }

    while ((wpid = wait(&status)) > 0){}
    printf("Hello, world!\n");
    return 0;
}