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C++ Language > Learn C++ Language > What is the preprocessor in C++?
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What is the preprocessor in C++?

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a preprocessor (or precompiler) is a program that processes its input data to produce output that is used as input in another program.
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Experienced Computer trainer having worked in IT sector for 20 years.

Preprocessor programs provide preprocessor directives that tell the compiler to preprocess the source code before compiling. All of these preprocessor directives begin with a ‘#’ (hash) symbol. The ‘#’ symbol indicates that whatever statement starts with a ‘#’ will...
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Preprocessor programs provide preprocessor directives that tell the compiler to preprocess the source code before compiling. All of these preprocessor directives begin with a ‘#’ (hash) symbol. The ‘#’ symbol indicates that whatever statement starts with a ‘#’ will go to the preprocessor program to get executed. We can place these preprocessor directives anywhere in our program. Examples of some preprocessor directives are: #include, #define, #ifndef, etc. read less
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