Question

What is preprocessor?? How it works?

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Answer 1

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In computer science, a preprocessor (or precompiler) 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.

Answer 2

Answer:

In computer science, a preprocessor (or precompiler) 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.

How it works?

The preprocessors are the directives, which give instructions to the compiler to preprocess the information before actual compilation starts. ... Preprocessor directives are not C++ statements, so they do not end in a semicolon (;). You already have seen a #include directive in all the examples.