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(February 2013) In computer science, a preprocessor is a program that processes its input data to produce output that is used as input to another program. The output is said to be a preprocessed form of the input data, which is often used by some subsequent programs like compilers. The amount and kind of processing done depends on the nature of the preprocessor; some preprocessors are only capable of performing relatively simple textual substitutions and macro expansions, while others have the power of full-fle
Learn more about preprocessor directives in C++ and how they can be implemented. Preprocessors are programs that accept input and produce output that in turn becomes input for the next cycle. Preprocessor directives are statements in a program that are preceded by the hash sign (#). Such directives facilitate portability and conditional compilation of your source code. In this article we will explore the preprocessor directives in C++ with code examples where applicable.