#include <stdio.h>

#include <unistd.h>

#include <string.h>

int main() {

    int fd[2]; // Array to hold the two ends of the pipe: fd[0] for reading, fd[1] for writing

    pid_t pid;

    char writeMessage[] = "Hello from parent process!";

    char readMessage[100];

    // Create the pipe

    if (pipe(fd) == -1) {

        perror("pipe failed");

        return 1;

    }

    // Fork a child process

    pid = fork();

    if (pid < 0) {

        perror("fork failed");

        return 1;

    } else if (pid > 0) {

        // Parent process

        close(fd[0]); // Close the reading end of the pipe in the parent

        // Write a message to the pipe

        write(fd[1], writeMessage, strlen(writeMessage) + 1);

        close(fd[1]); // Close the writing end of the pipe after writing

        // Wait for child process to finish

        wait(NULL);

    } else {

        // Child process

        close(fd[1]); // Close the writing end of the pipe in the child

        // Read the message from the pipe

        read(fd[0], readMessage, sizeof(readMessage));

        printf("Child process received: %s\n", readMessage);

        close(fd[0]); // Close the reading end of the pipe after reading

    }

return 0;

}