The C preprocessor is a macro processor that is used automatically by the C compiler to transform your program before actual compilation. ... You can define macros, which are abbreviations for arbitrary fragments of C code, and then the C preprocessor will replace the macros with their definitions throughout the program
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Explanation:
The C preprocessor is a macro processor that is used automatically by the C compiler to transform your program before actual compilation. ... You can define macros, which are abbreviations for arbitrary fragments of C code, and then the C preprocessor will replace the macros with their definitions throughout the program