using GUI

Am writing a spreadsheet program but I cannot draw line using codeblock. Please I need help.
Which GUI library do you use? QT? WxWidgets?
Does it mean that #include <graphic.h> won't work ? I have checked wxwidgets and its ok. One of the books am reading uses graphic.h, does it mean that the book is wrong?
<graphic.h> is non standart header supplied with Borland compilers. Moreover it is way outdated. It is better to use something which will work for most people and not only you.

Check also SFML: it is a good media engine.
I do appreciate. Thanks
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