Thread: When and where to use fflush (stdout)?

Hi,
I found this simple code

Code:

#include <stdio.h>
#include <ctype.h>
#include <conio.h>

int main ( void )
{
  int yn = 'y';

  while ( tolower ( yn ) == 'y' ) {
    printf ( "Doing stuff\n" );
    printf ( "Do more stuff? (y/n): " );
    fflush ( stdout );/* this line */
    yn = getch();
    printf ( "\n" );
  }

  return 0;
}

What I noticed is fflush function call On an output stream, fflush causes any buffered but unwritten data to be written;
I cannot figure out why fflush (stdout) is called here in this code
I try to comment this line and behavior was exactly the same.
Can someone explain what is purpose of calling fflush (stdout) for output stream here and general?