Preprocessor directives?

It may help to think of the relationship between a "directive" and being "given directions" (i.e. Orders). "preprocessor directives" are directions to the preprocessor about changes it should make to the code before the later stages of compilation kick in.

But, what's the preprocessor? Well, it's name is a bit recursive: it's simply there to process the textual source code, modifying it in various ways. This extra process gives more flexibility in selecting, combining and even generating parts of the program.

Include is the preprocessor directive, is just an argument supplied in addition to this directive, which in this case happens to be a file name.

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