Preprocessor directives control the compilation process from "summary" of C Programming Language by Brian W. Kernighan,Dennis Ritchie
Preprocessor directives control the compilation process. They provide a way to conditionally include or exclude code at compile time, or to define symbolic constants or macros. The preprocessor operates on the text of a program before actual compilation takes place. One common preprocessor directive is "#define", which defines a symbolic constant or macro. For example, "#define MAX_SIZE 100" defines MAX_SIZE as a constant with the value 100. Another directive is "#ifdef", which includes code if a certain symbol has been defined. Preprocessor dire...
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