Preprocessor is an integrated text processor which prepares the source code for compiling. Preprocessor allows:

• inserting text from a specifed file to a certain point in the code (see File Inclusion),
• replacing specific lexical symbols with other symbols (see Macros),
• conditional compiling which conditionally includes or omits parts of the code (see Conditional Compilation).

Note that preprocessor analyzes text at token level, not at individual character level. Preprocessor is controled by means of preprocessor directives and preprocessor operators.

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