是的，您可以-原始Windows用C编写.

虽然这是很多工作.即使您打算使用Windows UI指令以C编写GUI程序，如今也有许多更简便的方法-您必须自己做很多工作.***使用C ++或C#代替-它们提供了可以为您完成大部分(即使不是全部)UI艰苦工作的类.

"XHTML和HTML5有所不同"
XHTML是一种反映HTML语法的xml标记语言，但是它是更严格的版本，HTML5是具有对视频和音频的支持的扩展版本.

i am staring to learn c. can i create GUI(graphical user interface)by using C program?
is it possible please explain it and its requirements?

and i have another doubt ...
what is the different between XHTML and HTML5?
which one is advanced ?

Yes, you can - the original Windows was written in C.

It''s a heck of a lot of work though. Even if you mean to write a GUI program in C, that uses Windows UI instructions, there are a lot easier ways to do it these days - you would have to do a lot of the work yourself. Better off using either C++ or C# instead - they provide classes which do most (if not all) of the UI hard work for you.

"different between XHTML and HTML5"
XHTML is an xml markup language that mirrors HTML syntaxes, but is a stricter version, HTML5 is an extended version with support for video and audio