daniel.c

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>

int main()

{

    // fork() Create a child process

    int pid = fork();

    if (pid > 0) {

        //getpid() returns process id

        // while getppid() will return parent process id

        printf("Parent process\n");

        printf("ID : %d\n\n", getpid());

    }

    else if (pid == 0) {

        printf("Child process\n");

        // getpid() will return process id of child process

        printf("ID: %d\n", getpid());

        // getppid() will return parent process id of child process

        printf("Parent -ID: %d\n\n", getppid());

        sleep(10);

        // At this time parent process has finished.

        // So if u will check parent process id

        // it will show different process id

        printf("\nChild process \n");

        printf("ID: %d\n", getpid());

        printf("Parent -ID: %d\n", getppid());

    }

    else {

        printf("Failed to create child process");

    }

    return 0;

}