Hello there,
I do realize that this is probably very stupid question, but I am desperate, so 
please bare with me.
Here is the thing,
I am tring to teach myself a C++ from Stroustrups Programing principles and 
practice using C++. I have been doing rather rapid progress, as I did have some 
experiences from school, although I havent writen any code for few years. I 
have discovered the burned out ashes of what once was a great passion of mine, 
and mannaged to get the fire going again.
I got stuck at this FLTK excersize. My policy is to do as many exersizes as 
possible to make sure I really mastered new topic presented in each chapter. 
There is this one excersize. It requires building a picture of clock and geting 
a callbacks from FLTK each second, witch will move my clock. I am aware the 
fltk has got a clock widget, but I dont wanna use it. I know how to draw and 
move object in a window, but I am clearly missing something fundamental here. I 
cant figure out how to implement callback with Fl::run() and Fl::wait(). where 
and how should be the reqest for callback inbeded in the code. What should 
recieve it ?
I have been stuck on this for a month now. Somebody please help !
thank you

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