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The preprocessor is not a part of the LPC language proper. It's a special process that is run before the actual compilation of the program occurs. Basically it can be seen as a very smart string replacer; Specified strings in the code is replaced by other strings.
All preprocessor directives are given as strings starting with the character `#' on the first column of the line. You can put them anywhere, but as you'll be told later most of them do belong in the beginning of the code.
1.3.1 The #include statement 1.3.2 The #define statement The #define and undef statement 1.3.3 The #if, #ifdef, #ifndef, #else and #elseif statements