#include anywhere

Question

Is the #include meant to be used for headers only or is it simply a mechanical \"inject this code here\" that can be used anywhere in the code?

Answer 1

#include and other preprocessor directives like #define or #import, can appear anywhere in the source, but will only apply to the code after that inclusion. It is meant to include the referenced code into the source file that calls it. This MSDN page explains it quite well. http://msdn.microsoft.com/en-us/library/36k2cdd4(v=VS.71).aspx