---

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

int main(void)
{
    int fd1[2]; 
    int fd2[2]; 
    pid_t pid;
    char question[50], answer[50];
    int i;

    const char *questions[] = {
        "What is your name?",
        "How old are you?",
        "Bye!"
    };
    const char *answers[] = {
        "Pipe Master",
        "3 milliseconds",
        "Goodbye!"
    };

    if (pipe(fd1) == -1) {
        perror("pipe1");
        exit(1);
    }
    if (pipe(fd2) == -1) {
        perror("pipe2");
        exit(1);
    }

    pid = fork();
    if (pid == -1) {
        perror("fork");
        exit(1);
    }

    if (pid == 0) {
        
        close(fd1[1]); 
        close(fd2[0]); 

        for (i = 0; i < 3; i++) {
            read(fd1[0], question, sizeof(question));
            printf("Child received: %s\n", question);
            write(fd2[1], answers[i], strlen(answers[i])+1);
        }
        close(fd1[0]);
        close(fd2[1]);
        exit(0);
    } else {
                close(fd1[0]); 
        close(fd2[1]); 

        for (i = 0; i < 3; i++) {
            write(fd1[1], questions[i], strlen(questions[i])+1);
            read(fd2[0], answer, sizeof(answer));
            printf("Parent got: %s\n", answer);
        }
        close(fd1[1]);
        close(fd2[0]);
        wait(NULL);
    }

    return 0;
}