Actually I have already spent so much time to configure progress bar of FLTK. 
but i couldn't manage it out.. I just want that when i open any file, by 
reading lines from the file, progress bar will show the percentage of completed 
lines.

but when the file reading loop starts, Fl::check() make time interval i think 
so. progress bar is showing without any problem. but the speed of line reading 
is reduced 100 times may be. I don't know whats wrong with it. How can i make a 
real-time progress bar that works in real-time. real-time means if i print out 
something from a loop, progress bar should show the same percentage and timing 
as cout or printf shows.
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