What is the preprocessor in C++?

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Shivanand Chidre

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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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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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