Where are the c programming variable name rules defined? I usually use these two websites for figuring out these kind of things but I don't see it anywhere.
http://www.tutorialspoint.com/c_standard_library/c_function_scanf.htm
http://www.cplusplus.com/reference/cstdio/scanf/
Do you mean what rules you must follow for a valid identifier, or guidelines for informative variable names?
You can follow this guide ...
http://google-styleguide.googlecode.com/svn/trunk/cppguide.html#Variable_Names
To me the underline connector is most readable.
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