concept of buffering in c

i came to know about this concept from a random program from a random blog: Disemble
i am sending the program as attachment.

Code:

---

This program will not print "hello-out". Find out the problem.



#include <stdio.h>

  #include <unistd.h>

  int main()

  {

          while(1)

          {

                  fprintf(stdout,"hello-out");

                  fprintf(stderr,"hello-err");

                  sleep(1);

          }

          return 0;

  }

---

Great story, kid. Is there a question in there somewhere? Why don't you post your code in code tags, like a normal person. Some of us are hesitant to download strange files from strange people. Also, make sure you've covered the required reading:
Announcements - C Programming
and the supplemental stuff:
How To Ask Questions The Smart Way

Question 11.17

Edit: What! the link and code are not the same....
stdout is usually line buffered while stderr is not. You can set buffering mode using setvbuf(). or use flush().
The rest is RTFM.