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THANK YOU VERY VERY MUCH DEAR "@Kaud": HORRRRRAAAAAA.:thumb
I added all the .cpp files of the GUI folder that I have downloaded them to the project (they are Graph.cpp, GUI.cpp, Simple_window.cpp...

For knowing how I installed the FLTK, please read that link. I have wrote the instructions step-by-step in detail in that link. (The link written in post #8).

First off, there isn't any file named graph_lib.lib in my C:\ drive (where the OS and visual studio are installed on it) and I think this is the reason that compiler con't open it. If so why the code...

OK I inputted graph_lib.lib before fltk.lib separated by new line in the linker input. Now the list of linker input is like this:
graph_lib.lib fltkd.lib wsock32.lib comctl32.lib fltkjpegd.lib...

I used this snip code Graph_lib::Polygon poly; instead of this Polygon poly; and run the code again. Again there were 11 errors, first is this:
Error 9 error LNK2001: unresolved external symbol...

It is defined in Graph.h header file. And the code of that header is here: http://www.stroustrup.com/Programming/Graphics/Graph.h

I #included that header into the code but I don't know why the...

Hi guys,

I read Programming Principles and Practice using C++, Stroustrup's book. In chapter 12 and in page 441 (first example) there is this code:


// This is example code from Chapter 12.3...